Gas Tankless Water Heater
TM
Suitable for combination potable water heating
and space-heating
Please refer to local codes
for space-heating compliance.
FEATURING
• ENDLESSHOTWATER
• ON-DEMANDUSAGE
• COMPACT,SPACESAVING
• ENERGYCONSERVATION
• COMPUTERIZEDSAFETY
• NOPILOTLIGHT
• EASY-LINKSYSTEMAND
MULTI-UNITSYSTEM
Ifyouhaveanyquestions,pleasecallor
writeto:
IntheUnitedStates
500TennesseeWaltzParkway
AshlandCity,TN37015
TollFree:1-877-737-2840
InCanada
599HillStreetWest
Fergus,ONN1M2X1
1-888-479-8324
On-Demand Water Heater
Installation Manual and Owner’s Guide
- Do not store or use gasoline or other
flammablevaporsandliquidsinthevicinity
ofthisoranyotherappliance.
- WHATTODOIFYOUSMELLGAS
• Donottrytolightanyappliance.
• Donottouchanyelectricswitch,donot
useanyphoneinyourbuilding.
• Immediatelycallyourgassupplierfrom
aneighbor'sphone.Followthegas
supplier'sinstructions.
• Ifyoucannotreachyourgassupplier,call
thefiredepartment.
- Installation and service must be performed
byaqualifiedinstaller,serviceagencyorthe
gassupplier.
WARNING
If the information in these
instructions is not followed
exactly,afireorexplosionmay
resultcausingpropertydamage,
personalinjuryordeath.
Keep this manual near the water heater for future reference whenever maintenance, adjustment, or
serviceisrequired.
ANSI Z21.10.3 ・ CSA 4.3
For supplying potable
hot water
ASME model ONLY
HLW
Models
910/910 ASME
R
DR
2 Page
CONTENTS
Installation Manual
SPECIFICATIONS ......................................................................2
INTRODUCTION .....................................................................4
SAFETY GUIDELINES..............................................................6
SAFETY DEFINITION ............................................................6
GENERAL ..............................................................................6
INSTALLATION .........................................................................7
GENERAL ..............................................................................7
CLEARANCES ............................. ...........................................9
INCLUDED ACCESSORIES ....................................................9
OPTIONAL ITEMS ................................................................9
WARNING FOR INSTALLATIONS .......................................11
OUTDOOR INSTALLATIONS...............................................12
Clearances ........................................................................12
INDOOR INSTALLATIONS ..................................................13
Clearances ........................................................................13
Combustion air supply .....................................................13
Direct intake vent system .................................................14
VENTING INSTRUCTIONS .................................................15
General .............................................................................15
Vent length and No. of Elbows .........................................17
Indoor installation diagrams ............................................17
Clearances for sidewall terminations ...............................18
Clearances for rooftop terminations ................................19
Vent termination clearances ............................................20
GAS SUPPLY AND GAS PIPE SIZING .................................21
General .............................................................................21
Gas connections ...............................................................21
Natural gas supply piping .................................................22
Propane (LP) supply piping ...............................................22
WATER CONNECTIONS .....................................................23
Pressure relief valve .........................................................23
ELECTRICAL CONNECTIONS .............................................24
REMOTE CONTROLLER CONNECTION .............................24
EXTERNAL FAN MOTOR CONNECTION ............................25
PUMP CONTROL CONNECTIONS .....................................25
Pump control mode .........................................................25
TWO UNIT PRIORITY .........................................................26
EASY-LINK SYSTEM .................................................................... 27
Easy link connection procedures ......................................27
MULTI-UNIT SYSTEM ................................................................ 29
APPLICATIONS ....................................................................... 30
SPACE HEATING APPLICATIONS .......................................30
RECIRCULATION ................................................................30
DUAL-PURPOSE HOT WATER HEATING ..............................31
INITIAL OPERATION ..............................................................32
Owner's Guide
OPERATING SAFETY ..............................................................34
NORMAL OPERATION ...........................................................36
GENERAL ............................................................................36
WITH REMOTE CONTROLLER ...........................................36
Set temperature ...............................................................37
Temperature tables of controller .....................................37
Other functions ................................................................37
TEMPERATURE SETTINGS ON THE COMPUTER BOARD ........38
FLOW ...................................................................................39
FREEZE PROTECTION SYSTEM ..........................................39
MAINTENANCE AND SERVICE .......................................... 39
Measuring inlet gas pressure ...........................................40
UNIT DRAINING AND FILTER CLEANING ............................. ...40
TROUBLESHOOTING..............................................................41
GENERAL ............................................................................41
ERROR CODES ....................................................................43
General .............................................................................43
Error code display .............................................................43
Easy-Link System ..............................................................43
Fault analysis of error code ..............................................44
COMPONENTS DIAGRAM .....................................................46
PARTS LIST ............................................................................. 50
OUTPUT TEMPERATURE CHART ...........................................52
SPECIFICATION
Natural Gas Input
(Operating Range)
BTU/H
Min: 15,000 BTU/h
Max: 380,000 BTU/h
Propane Input
(Operating Range)
BTU/H
Min: 15,000 BTU/h
Max: 380,000 BTU/h
Gas Connection 1” NPT
Water Connections 1” NPT
Water Presure* psi
(Mpa)
15 - 150 psi*
(0.1 - 1.0 Mpa)
Natural Gas
Inlet pressure
" W.C.
(kPa)
Min.: 4” W.C.(1.00 kPa)
Max.: 10.5” W.C.(2.61 kPa)
Propane Gas
Inlet pressure
" W.C.
(kPa)
Min.: 8” W.C.(1.99 kPa)
Max:. 14” W.C.(3.48 kPa)
Weight lbs.
(kg)
102 lbs. (46.3Kg)
Dimensions Inch
(mm)
H 25.3 in. (643mm) ×
W 24.8 in. (630mm) ×
D 11.8 in. (300mm)
Ignition Electric Ignition
Electric
Supply
VAC/Hz
120 VAC/60 Hz
Consumption
Operation
W/A 178 W (1.48 A)
Stanby
W/A 16 W (0.13 A)
Freeze-
Protection
W/A 271 W (2.26 A)
Category Category III
*40 psi (0.28 Mpa) or above is recommended for
maximum flow.
**Water heater Category — water heaters of other than
direct vent type, for outdoor installation, are divided into
four categories based on static pressure produced in the
vent and flue loss.
Category I - a water heater that operates with a non-
positive vent static pressure and with a vent gas
temperature that avoids excessive condensate pro-
duction in the vent.
Category II - a water heater that operates with a non-
positive vent static pressure and with a vent gas
temperature that may cause excessive condensate
production in the vent.
Category III - a water heater that operates with a posi-
tive vent static pressure and with a vent gas tempera-
ture that avoids excessive condensate production in
the vent.
Category IV - a water heater that operates with a posi-
tive vent static pressure and with a vent gas tempera-
ture that may cause excessive condensate produc-
tion in the vent.
***These are equivalent lengths that include head loss
for elbows, tees, unions, etc.
NOTE:
• Check the rating plate to ensure that this prod-
uct matches your specifications.
• The manufacturer reserves the right to discon-
tinue, or change at any time, specifications or
designs without notice and without incurring
obligation.
Contents
3 Page
Installaon Manual
Installation Manual
CONGRATULATIONS
Congratulations and thank you for choosing our tankless water heater.
Before use, we recommend that you read through this installation
manual carefully. Keep this manual for future reference.
If you need an additional manual, contact the manufacturer or your
local distributor. When you call, please tell us the product name and
the serial number of your unit written on the rating plate of the water
heater.
4 Page
INTRODUCTION
• This manual provides information necessary for the installation, operation, and maintenance of the
water heater.
• The model description is listed on the rating plate which is attached to the side panel.
• Please read all installation instructions completely before installing this product.
• If you have any problems or questions regarding this equipment, consult the manufacturer or its local
representative.
• This appliance is an on-demand, tankless water heater. It is designed to efficiently supply endless hot
water for your needs.
• The 910 has two heat exchangers. The primary and secondary heat exchangers alternate roles, extend-
ing the life of the 910. (See p. 5.)
• The principle behind tankless water heaters is simple:
Heat
exchanger
Exhaust
Burner
Fan Fan
Burner
Heat
exchanger
Gas inlet
Cold water inlet
Hot water inlet
Igniter
Gas valve
Water control valve
Flow sensor
Thermistor
Thermistor
Flow
sensor
Thermistor
Computer board
1
8
2
3
3
4
4
5
6
6
7
7
7
7
5
4
4
*This diagram illustrates tankless water heater design concepts only and does not accurately represent
the water heater’s physical description.
1. A hot water fixture is turned on.
2. Water flows through the heater.
3. The water flow sensor detects the water flow.
4. The computer initiates the fan motor and gas valve to let gas flow through the heater and sends a signal to the
igniter to create an ignition spark.
5. The gas ignites and flames appear within the burner chamber.
6. Water is heated as it flows through the heat exchanger.
7. Using thermistors to measure temperatures throughout the water heater, the computer modulates the gas and
water valves to ensure proper output water temperature and hot water outflows.
8. When the fixture is turned off, the unit shuts down.
Introducon
Installaon Manual
5 Page
Introducon
Installaon Manual
Combuson secons
Right combuson
secon
Le combuson
secon
The 910 has two combustion sections. The combustion section that turns on first is the primary section.
The secondary section will activate when the flow rate through the primary section meets the flow listed
in the table below.
Set temperature °F (°C )
Flow rate at which the
secondary section activates
GPM (L/min)
100-120 (38-49) 3.2 (12)
125,130 (52,54) 2.9 (11)
140 (60) 2.6 (9.8)
145,150 (63,65.5) 2.4 (9)
155-185 (68-85) 2.1 (8)
Example:
If the set temperature is 120 °F (49 °C ):
The section(s) in operation is indicated by the black square(s).*
Depending on which side is the primary secon
910
OR
Total Flow < 0.5 GPM (1.9 L/min.)
(standby)
0.5 GPM (1.9 L/min) < Total Flow < 3.2 GPM (12 L/min.)
(only primary secon res)
Total Flow > 3.2 GPM (12 L/min)
(both secons re)
910910
910
*The primary and secondary combustion sections will alternate every 100 firing cycles or every 12 hours of opera-
tion.
6 Page
SAFETY GUIDELINES
SAFETY DEFINITION
GENERAL
1. Follow all local codes, or in the absence of local codes, follow the current edition of the National Fuel
Gas Code: ANSI Z223.1/NFPA 54 in the USA or B149.1 Natural Gas and Propane Installation code in
Canada.
2. Properly ground the unit in accordance with all local codes, or in the absence of local codes, with
the current edition of the National Electrical Code: ANSI/NFPA 70 in the USA or CSA standard C22.1
Canadian Electrical Code Part 1 in Canada.
3. Carefully plan where you intend to install the water heater. Please ensure:
• Your water heater will have enough combustion air and proper ventilation.
• Locate your heater where water leakage will not damage surrounding areas. (Please refer to p. 8.)
4. Check the rating plate for the correct GAS TYPE, GAS PRESSURE, WATER PRESSURE and ELECTRIC
RATING. If this unit does not match your requirements, do not install and consult with the
manufacturer.
5. If any problem should occur, turn off all hot water fixtures and turn off the gas. Then call a trained
technician, the gas company, or the manufacturer.
Safety Guidelines
Installaon Manual
WARNING
Indicates an imminently hazardous situation which, if not avoided, could result
in death or serious injury.
CAUTION
Indicates an imminently hazardous situation which, if not avoided, could result
in minor or moderate injury.
Indicates an imminently hazardous situation which, if not avoided, will result in
death or serious injury.
DANGER
Indicates information considered important but not hazard related.
WARNING
• Water temperatures over 125 °F (52 °C) can cause severe burns instantly or death from
scalding. The water temperature is set at 120 °F (50 °C) from the factory to minimize any
scalding risk. Before bathing or showering, always check the water temperature.
• Do not store or use gasoline or other flammables, vapors, or liquids in the vicinity of this appliance.
• Do not reverse the water and/or gas connections as this will damage the gas valves and can
cause severe injury or death. Follow the diagram on p. 23 when installing your water heater.
• Do not use this appliance if any part has been under water. Immediately contact a
qualified installer or service agency to replace a flooded water heater. Do not attempt
to repair the unit! It must be replaced!
• Do not disconnect the electrical supply if the ambient temperature will drop below
freezing. The Freeze Protection System only works if the unit has electrical power. The
warranty will not be covered if the heat exchanger is damaged due to freezing. For more
information, refer to Freeze Protection System on p. 39.
• Failure to observe these warnings can result in serious personal injury or death.
NOTICE
7 Page
INSTALLATION
GENERAL
1. Follow all local codes, or in the absence of local codes, follow the current edition of the
National Fuel Gas Code: ANSI Z223.1/NFPA 54 in the USA or B149.1 Natural Gas and
Propane Installation Code in Canada.
2. All gas water heaters require careful and correct installation to ensure safe and efficient
operation. This manual must be followed exactly. Read the “Safety Guidelines” section.
3. The manifold gas pressure is preset at the factory. It is computer controlled and should not
need adjustment.
4. Maintain proper space for servicing. Install the unit so that it can be connected or removed
easily. Refer to the "Clearances" section on p. 9 for proper clearances.
5. The water heater must be installed in a location where the proper amount of combustible
air will be available to it at all times without obstructions.
6. Electrical service to the water heater requires a means of disconnection. This will allow
power to the water heater to be shut off for servicing and safety purposes.
7. Do not install the unit where the exhaust vent is pointing into any opening in a building
or where the noise may disturb your neighbors. Ensure that the vent termination meets
the minimum distance requirements, including minimum clearances from doorways or
openings. (Refer to pp. 18 to 20.) Check local code requirements prior to installation.
8. Carefully plan the installation location of the heater and vent terminations. Contaminants
such as aerosols, lint, and fine powders (including flour) can clog the air intake and reduce
the operation of the fan. This, in turn, can cause improper combustion and reduce the
life of the water heater. Regularly ensure that the area around the water heater, vent
termination, and air intake is free of dust, debris, and other contaminants. In environments
with a high level of contaminants (laundry facilities, hair salons, pet salons, chemical plants,
commercial kitchens, etc.), direct venting is required. Refer to "Direct Vent Intake" section
on pp. 14.
9. If the water heater is used as a direct-vent appliance, the unit requires a 5 in. (127 mm)
combustible air supply pipe. The intake pipe must be sealed airtight. Refer to "Venting
instructions" on pp.15 to 20 for more detail.
10. Terminating the venting through a sidewall is recommended for the direct-vent system.
11. Running the exhaust vent and the intake pipe parallel is recommended.
12. Terminating the exhaust and intake on the same wall/surface is recommended. Terminating
in the same pressure zone allows for pressure balancing, which prevents nuisance
shutdowns.
13. Only install the water heater in a heated area where below freezing temperatures cannot
occur. The warranty does not cover damage caused by freezing.
14. The water heater must be securely mounted to a wall or other suitable structure.
Installaon
Installaon Manual
8 Page
• The 910 model weighs 102 lbs. (46.3 kg). Ensure that any and all support structures
(whether it is installed on a wall, on a support stand, etc.) have enough strength to
support and hold the water heater.
• When handling the 910, do not place your hands inside the flue collar. Injury may
result.
• Installation and service must be performed by a qualified installer (for example, a
licensed plumber or gas fitter). Otherwise, the warranty will be void.
• The installer (licensed professional) is responsible for the correct installation of the
water heater and for compliance with all national, state / provincial, and local codes.
• The manufacturer does not recommend installing the water heater in a pit or location
where gas and water can accumulate.
• Do not have the vent terminal pointing toward any operating window, door, or opening
into a building.
• Do not install the unit where water, debris, or flammable vapors may get into the flue
terminal.
• Do not install next to any source of airborne debris, such as a clothes dryer, that can
cause debris to be trapped inside the combustion chamber, unless the system is direct-
vented.
• The manufacturer does not suggest installing the water heater in an attic due to
safety issues. If you install the water heater in an attic:
• Make sure the unit will have enough combustion air and proper ventilation.
• Keep the area around the water heater and its termination clean. When dust
collects on the flame sensor, the water heater will shut down and produce an
error code.
• If the above conditions cannot be met, use the direct-vent conversion kit
100112186 (TM-DV50).
• Place the unit for easy access for service and maintenance.
• A drain pan, or other means of protection against water damage, is recommended
to be installed under the water heater in case of leaks. The manufacturer is not
responsible for damage due to water leaks.
• Failure to observe these warnings could result in severe personal injury, death, and/or
property damage.
WARNING
• The warranty will not cover damage caused by water quality.
• Only potable water can be used with this water heater. Do not introduce pool or
spa water, or any chemically treated water into the water heater.
• Water hardness levels must not exceed 7 grains per gallon (120 ppm) for single
family domestic applications or more than 4 grains per gallon (70 ppm) for
all other types of applications. Water hardness leads to scale formation and
may affect / damage the water heater. Hard water scaling must be avoided or
controlled by proper water treatment.
• Water pH levels must be between 6.5 and 8.5.
• Well water must be treated.
• The manufacturer recommends direct venting when the water heater is installed
in beauty salons, dry cleaners or any other locations in which such chemicals are
present in the air. Some chemicals used in beauty salons or dry cleaners may affect
the flame sensor. In such cases, the water heater may not work properly.
• Although the water heater is designed to operate with minimal sound, the manufacturer
does not recommend installing the unit on a wall adjacent to a bedroom, or a room
that is intended for quiet study or meditation, etc.
• Locate your heater close to a drain where water leakage will not do damage to
surrounding areas. As with any water heating appliance, the potential for leakage
at some time in the life of the product does exist. The manufacturer will not be
responsible for any water damage that may occur. If you install a drain pan under the
unit, ensure that it will not restrict the combustion air flow.
Installaon
Installaon Manual
NOTICE
9 Page
CLEARANCES
OPTIONAL ITEMS
#
Model
Indoor Installation
Outdoor Installation
1. Remote controller: 100112155 (TM-RE30)
✓
✓
(Remote should be installed
indoors.)
2 Multi-unit Controller: 100112691 (TM-MC02)
✓ ✓
3.
5" (127 mm) Backflow preventer and F-F adaptor
100112598
✓
5" (127 mm) Universal Appliance Adaptor, F-F adaptor,
backflow preventer, condensate drain trap
2SVBFDPA05
✓
4. Vent cap: 100112194 (TM-VC50)
✓
5. Direct-vent conversion kit: 100112186 (TM-DV50)
✓
6. Pipe cover: 100112190 (TM-PC50)
✓ ✓
7.
5" Sidewall vent termination (Hood)
100112594/2NVTH5
✓
5" Wall thimble
(Refer to the next page.)
✓
8.
Direct-vent concentric termination
(Refer to the next page.)
✓
Installaon
Installaon Manual
INCLUDED ACCESSORIES
Installation manual
and Owner’s guide
Communication cable
100076417
Qty: 1
Qty: 1
Installation Top Bottom Front Back Sides
Indoor installation
12 in.
(305 mm)
12 in.
(305 mm)
4 in.**
(102 mm)
1.0 in.
(25 mm)
3 in.
(76 mm)
Outdoor installation
36 in.
(914 mm)
12 in.
(305 mm)
24 in.
(610 mm)
1.0 in.
(25 mm)
3 in.
(76 mm)
*Standard indoor installations and direct-vent indoor installations have the same clearances.
**24 inches recommended for maintenance.
***For the multiple installation of outdoor models, refer to the above clearances.
Maintain all clearances around the water heater.
Failure to do so could create a fire hazard, potentially leading to death, seri-
ous injury, and/or property damage.
WARNING
10 Page
1. Temperature remote controller
100112155 (TM-RE30)
The remote controller has the
following functions:
• adjusts the output tempera-
ture of hot water.
• provides informations of the
flow rate, output tempera-
ture, and so on.
• provides error code when
the water heater has some
trouble.
2. Multi-unit controller
100112691(TM-MC02)
The multi-unit controller can control
a maximum of 10 water heaters,
from 15,000 BTU to 3,800,000 BTU.
It also works as a diagnostic tool that
will give an error code whenever
there is a problem with the water
heater system.
Each multi-unit controller comes
with a remote controller.
3. 5” Backflow preventer
They prevent air
backflow from a
vent system of Nova
Vent line. Install
in accordance with
the installation
instructions that
are packed with the
preventer.
100112598 2SVBFDPA05
4. Vent cap:100112194(TM-VC50)
The cap installed on the top of the water heater for
outdoor installation. It will prevent any debris from
entering the unit and causing damage or a fire haz-
ard, as well as rain.
5. Direct-vent conversion kit: 100112186
(TM-DV50)
The kit can be used to con-
vert to a direct venting system
or sealed combustion system.
Install in accordance with the
manufacturer's installation
instructions and any applicable
codes.
6. Pipe cover: 100112190(TM-PC50)
The pipe cover protects the
plumbing pipes from unex-
pected adjustments. It is
fixed to the bottom of the
water heater and hides the
plumbing and improves the
visial aspects of the whole
installation of the heater.
7. Sidewall vent termination (Hood) and Wall thimble:
They are used when venting out through the wall. These terminations are special stainless steel vents for gas
appliances and are UL listed as Category II, III and IV. For different wall thicknesses, there are two ranges of lengths
available. (Refer to the NovaVent brochure for details.) Install these vent terminations in accordance with their
installation instructions and any applicable local codes.
TerminationHood
Wallthimble
8. Concentric Vent Kit:
Covering wall thicknesses
Part# Part#
5" Termination Hood 100112594 2NVTH5
5" Wall Thimble 4 - 7 in. (102 - 178 mm) 100112734 2NVWT5
5" Wall Thimble 5 - 10 in. (127 - 254 mm) 100112735 2NVWT5L
Used when terminating direct-vent (sealed combustion) systems, with
indoor models that require a 5 in. (125 mm) intake and a 5 in. (125 mm)
exhaust. This concentric termination provides the convenience of only
having to make one penetration through a sidewall instead of two separate
penetrations for the intake and exhaust piping. The termination includes
a bird screen, restricting small animals, pests, and foreign objects from
entering into the vent system. Threre are two kits for the 5 in. (125 mm)
where the difference is the wall thickness adjustment:
5.0" - 10.0" (127 - 254 mm): 100112606
12.0" - 18.0" (305 - 457 mm): 100112601
(Refer to the Flexmaster brochure for details.)
Installaon
Installaon Manual
11 Page
WARNING FOR INSTALLATIONS
FOR YOUR SAFETY, READ BEFORE INSTALLATION:
Do not install the heater where water, debris or
flammable vapors may get into the flue terminal.
This may cause damage to the heater and void the
warranty.
Do not have the vent terminal pointing toward
any opening into a building. Do not locate your
water heater in a pit or location where gas and
water can accumulate.
Do not install this water heater under an
overhang less than 3 ft (914 mm) from its top
or eaves. The area under an overhang must be
open to three sides (Outdoor models only).
Do not install next to a dryer or any source
of airborne debris that can be trapped inside
the combustion chamber, unless the system
is direct-vented. The air intake must maintain
a safe distance from the dryer's exhaust vent.
This will help to prevent lint from being drawn
into the water heater's air intake.
Prohibited
Prohibited
3 ft
(914 mm)
Installaon
Installaon Manual
Water heater vent terminator must be at least 2
ft (610 mm) away from an inside corner for both
outdoor installation, indoor single vent, or direct-
vent installation.
Inside
Corner
2 ft
(610 mm)
USA: 1 (30 cm) min.
Canada: 3 (91 cm) min.
USA: 1 (30 cm) min.
Canada: 3 (91 cm) min.
USA: 1 (30 cm) min.
Canada: 3 (91 cm) min.
USA: 12 in. (30 cm) above grade and
above ancipated snow level
Canada: 12 in. (30 cm) above grade
Ancipated snow level
Ensure that you meet the minimum clearances
shown below for a direct vent termination:
12 Page
Installaon
Installaon Manual
OUTDOOR INSTALLATION
1. Follow all local codes, or in the absence of local codes, follow the current edition of the National
Fuel Gas Code: ANSI Z223.1/NFPA 54 in the USA or B149.1 Natural Gas, Propane Installation Code in
Canada.
2. Install outdoors only in areas with mild, temperate climates.
3. Change the DIP switch for outdoor installation. Locate the lower banks of DIP switches on the right of
the 7-Seg. LED on the center computer board. (See the graphic below.) The No. 6 ("OUT") DIP switch
on that bank must be switched to its ON position and the No. 5 ("DIRE") DIP switch must be in the
OFF positon. (Do not adjust the upper bank of DIP switches).
4. The outdoor vent cap must be used when unit is installed outdoor. The manufacturer requires the use
of its part No. 100112194 (TM-VC50).
5. When installed outdoors, the water heater shall be wall-mounted or mounted on a stand. Locate the
water heater in an open, unroofed area and maintain the minimum clearances that are listed at the
bottom of this page.
WARNING
• To change the DIP switch settings for outdoor installation, locate the lower bank of
DIP switches at the bottom of the center computer board as shown below.
• Only adjust the appropriate DIP switches as shwon below.
• Turn off the power supply to the water heater before changing the DIP switch settings.
• Failure to observe this warning could result in carbon monoxide poisoning or death.
• Maintain all clearances around the
water heater. Failure to do so could
create a fire hazard, potentially lead-
ing to death, serious injury, and/or
property damage.
• There is a 3 inch (76 mm) clearance
from the left and right sides of the
unit to combustible and non-com-
bustible surfaces. However, if any
portion or area of the surface is
exposed to the exhaust fumes (i.e.
directly to the sides of the vent cap),
that surface must be at least 24 inch
(610 mm) away.
WARNING
Top
36 in.(914 mm)
Side
24 in.(610 mm)
Side
24 in.(610 mm)
Front
24 in.(610 mm)
Front
24 in.(610 mm)
Boom
12 in.(305 mm)
Side
3 in.
(76 mm)
Side
3 in.
(76 mm)
Back
0.5 in.
(13 mm)
-Clearances-
ON
MST
P-ALARM
OUT
DIRE
MODE
TMP3
TMP2
TMP1
87654321
The dark squares indicate the correct
positions of DIP switches.
The lower bank of DIP switches
ON
OFF
13 Page
Installaon
Installaon Manual
-Clearances-
Maintain all clearances around the water
heater. Failure to do so could create a
fire hazard, potentially leading to death,
serious injury, and/or property damage.
WARNING
Top
12 in.(305 mm)
Front 4 in.(102 mm)
24 in. (610 mm)
Recommended
for maintenance
Boom
12 in.(305 mm)
Side
3 in.
(76 mm)
Side
3 in.
(76 mm)
Back
0.5 in.
(13 mm)
-Combustion air supply-
The water heater location must provide enough air for proper combustion and ventilation of the surrounding
area. See the current edition of ANSI Standard Z223.1 or any applicable local codes. In general, these require-
ments specify that if the unit is installed in a confined space, there must be a permanent air supply opening.
Minimum recommended air supply opening size for water heater:
Water heater size When drawing make-up air from out-
side the building
When drawing make-up air from inside the
building (from other rooms within)
Max.
380,000 BTU/h
25.3 in
2
(163.2 cm
2
) 380 in
2
(2451.6 cm
2
)
When combustion air is supplied
from outside the building, an open-
ing communicating directly with the
outside should have a minimum free
area of one square inch per 15,000
BTUH input of the total input rating
of water heater in the enclosed area.
When combustion air is supplied from inside
the building, an opening communicating with
the rest of the dwelling should have a minimum
free area of one square inch per 1,000 BTUH
input of the total input rating of water heater in
the enclosed area. This opening should never be
less than 199 in
2
(1283.9 cm
2
).
ON
MST
P-ALARM
OUT
DIRE
MODE
TMP3
TMP2
TMP1
87654321
The dark squares indicate the cor-
rect positions of DIP switches.
Lower bank of DIP switches
INDOOR INSTALLATION
1. Follow all local codes, or in the absence of local codes, follow the current edition of the National
Fuel Gas Code: ANSI Z223.1/NFPA 54 in the USA or B149.1 Natural Gas, Propane Installation Code in
Canada.
2. Do not change the DIP switch settings for indoor installations. The DIP switch settings were already
set at the factory. Make sure the No. 5 ("DIRE") and No. 6 ("OUT") DIP switches are in the OFF posi-
tion. (These switches are located on the lower bank of DIP switches as shown below.)
3. For venting instructions for indoor installations, refer to pp. 15 to 20.
14 Page
Combustible air supplied by mechanical fan or make up air device
The water heater is equipped with a combustible air sensor that will shut off the unit when inadequate com-
bustible air supply to unit is detected.
• If a mechanical fan or make up air device is used to supply air to the water heater or utility room, the
installer should make sure it does not create drafts which could cause nuisance shutdowns.
• If a blower is necessary to provide adequate combustion air to the water heater, the blower and water
heater must be set up so that the water heater cannot fire unless the blower is operating. Possible
methods include the use of the water heater internal fan control port or the use of external flow sensors/
transmitters and relays.
-Direct intake vent system-
This water heater may be converted to a direct-vent (sealed combustion) appliance by installing an adapt-
er 100112186 (TM-DV50) which will bring all required combustible air from outside the building. When
installing the direct-vent conversion kit, please follow all instructions included with the kit.
• The water heater must be installed in a location where the proper amount of combustible air will be
available to it at all times without obstructions.
• If used as a direct-vent appliance, the water heater
requires a 5” (127 mm) combustible air supply pipe. The
intake pipe must be sealed airtight.
• Air supply pipe can be made of ABS, PVC (solid core),
CPVC (solid core), galvanized steel, corrugated aluminum,
corrugated stainless steel or Category III stainless steel.
• Use of cellular core PVC (ASTM F891), cellular core CPVC,
or Radel® (polyphenylsulfone) in non-metallic venting
systems is prohibited. Covering non-metallic vent pipe
and fittings with thermal insulation is prohibited.
• Change the DIP switch settings to the direct-vent system.
(See diagram below.)
• Sidewall venting is recommended for the direct-vent
system.
• The manufacturer recommends running the exhaust vent
and the intake pipe parallel.
• For the venting instructions for direct intake vent installa-
tions, refer to pp. 15 to 20.
5”Intake air port
Exhaust
Louver cover plates
Direct vent
conversion kit
Installaon
Installaon Manual
WARNING
• To change the DIP switch settings for direct vent installation, locate the lower bank of
DIP switches at the bottom of the center computer board as shown below.
• Only adjust the appropriate DIP switches as shwon below.
• Turn off the power supply to the water heater before changing the DIP switch settings.
• Failure to observe this warning could result in carbon monoxide poisoning or death.
ON
MST
P-ALARM
OUT
DIRE
MODE
TMP3
TMP2
TMP1
87654321
The dark squares indicate the correct
positions of the DIP switches.
The lower bank of DIP switches
ON
OFF
15 Page
VENTING INSTRUCTIONS
For indoor installations
-General-
• Improper venting of this appliance can result in excessive levels of carbon monoxide
which can result in severe personal injury or death.
• Improper installation can cause nausea or asphyxiation, severe injury or death from
carbon monoxide and flue gases poisoning. Improper installation will void product
warranty.
• When installing the vent system, all applicable national and local codes must be
followed. If you install thimbles, fire stops or other protective devices and they
penetrate any combustible or noncombustible construction, be sure to follow all
applicable national and local codes.
WARNING
The water heater must be vented in accordance with “Venting of Equipment" in the current edition of the
National Fuel Gas Code: ANSI Z223.1/NFPA 54, and Section 8 of B149.1 Natural Gas in Canada, Propane
Installation Code in Canada, as well as applicable local building codes.
The manufacturer recommends NovaVENT™ or Z-Vent® category III, single wall, stainless steel venting.
See "Approved Category III, Single Wall, Stainless Steel Venting Suppliers and Part Numbers" on p. 16.
General rules for air intake:
The water heater can obtain its combustion air from the space that it is installed in or it can be direct
vented.
• The air intake can use 5" PVC (solid core), CPVC (solid core), ABS, or category III vent.
• Use of cellular core PVC (ASTM F891), cellular core CPVC, or Radel® (polyphenylsulfone) in non-
metallic venting systems is prohibited. Covering non-metallic vent pipe and fittings with thermal
insulation is prohibited.
• Ensure that the installation location has sufficient, clean combustion air. If unsure, direct vent the
heater with the direct vent conversion kit 100112186 (TM-DV50).
Direct venting installation:
• The maximum length of intake air piping must not exceed 50 ft (15.2 m). Deduct 5 ft (1.5 m) for
each 90° elbow or 2.5 ft (0.76 m) for each 45° elbow used in the venting system. Two 45° elbows
when connected together are equivalent to one 90° elbow. Refer to the tables on p. 17.
• When the horizontal air intake exceeds more then 5 ft, support the pipe every 3 ft with pipe hangers.
• Vertical air intake pipe must be supported with pipe hangers. Ensure that the weight of the pipe
is not carried by the water heater.
General rules for venting water heaters are:
• Place the water heater as close as possible to the vent termination.
• The vent collar of the water heater must be fastened directly to an unobstructed vent pipe.
• Do not weld the vent pipe to the water heater’s vent collar.
• Do not cut or alter the shape of the vent collar of the unit.
• The vent must be easily removable from the top of the water heater for normal service and
inspection of the unit and vent system.
• The water heater vent must not be connected to any other gas appliance or vent stack.
• Avoid using an oversized vent pipe or using extremely long runs of pipe.
• For rooftop venting, a rain cap or other form of termination that prevents rain water from
entering into the water heater must be installed.
• Do not common vent or connect any vent from other appliances to the water heater vent.
• The manufacturer will not be responsible for any damage to the water heater caused by
condensation from the vent. For horizontal runs, slope the vent run downwards toward the
vent terminal at a rate of ¼” per foot (6.4mm per 305mm). For horizontal runs that do not slope
Installaon
Installaon Manual
16 Page
downward and for vertical runs, installing a condensate drain is recommended. Please refer to
pp. 17 and 18 for the diagrams.
• A backflow preventor should be installed in the exhaust when the heater is installed in climates
subject to freezing temperatures.
General rules for vent terminations:
• Avoid locating the water heater vent termination near any air intake devices. These fans can
pick up the exhaust flue products from the water heater and return them to the building. This
can create a health hazard.
• Locate the vent termination so that it cannot be blocked by any debris, at any time. Most codes
require that the termination must be at least 12 in. (305 mm) above grade and anticipated snow
level, but the installer may determine if it should be higher depending on the job site condition
and applicable codes.
• A proper sidewall termination is required when the water heater is vented through a sidewall.
• Refer to the following pages for exhaust termination and air inlet clearances.
Approved Category III, Single Wall, Stainless Steel Venting Suppliers and Part Numbers
WARNING! Do not mix parts or fittings of different material types, and do not mix pipe, fittings, or
joining methods from different manufacturers. Combustion exhaust can contain carbon monoxide and
must be properly vented outside. Breathing abnormal amounts of carbon monoxide can result in seri-
ous injury or death.
Description
Heater Vent Kits
Z-FLEX®
NovaVENT™
5" Air intake hood 100112579 2FAIGAL05
5" Gear clamp N/A 7HS84X
5" Straight pipe - 6" length 100112580 2NVP5.5
5" Straight pipe - 1' length 100112581 2NVP51
5" Straight pipe - 2' length 100112582 2NVP52
5" Straight pipe - 3' length 100112583 2NVP53
5" Straight pipe - 4' length 100112584 2NVP54
5" Adjustable straight - 10"-18" length 100112585 2NVALS5
5" 45 degree elbow 100112586 2NVE545
5" 90 degree elbow 100112587 2NVE590
5" Wall thimble (4"-7") 100112734 2NVWT5
5" Wall thimble (5"-10") 100112735 2NVWT5L
5" Horizontal drain pipe 100112588 2NVHD5
5" Vertical drain pipe 100112589 2NVVD5
5" Storm collar 100112590 2NVSC5
5" Firestop 100112591 2NVFS5
5" Flat roof flashing 100112592 2NVFF5
5" Angled roof flashing 100112593 2NVAF5
5" Termination hood 100112594 2NVTH5
5" Termination tee 100112595 2NVTT5
5" Extreme weather rain cap 100112596 2NVWC5
5" Universal appliance adaptor - 3-in-1 (F-F adaptor, condensate drain, &
back-flow preventer
100112597 2NVBFA5
5" Back-flow preventor & F-F adaptor 100112598 2NVBFU5
5" F-F adaptor 100112599 2NVAFF5
5" Support strap 100112600 2NVSS51
Installaon
Installaon Manual
17 Page
-Vent length and No. of Elbows-
This is a Category III appliance and must be vented accordingly. The vent system must be sealed airtight. All seams
and joints without gaskets must be sealed with high heat resistant silicone sealant or UL listed aluminum adhesive
tape having a minimum temperature rating of 350 °F (177 °C). For best results, a vent system should be as short
and straight as possible.
• This water heater is a Category III appliance and must be vented accordingly with any 5 in. (127 mm) vent
approved for use with Category III or Special BH type gas vent.
• Follow the vent pipe manufacturer’s instructions when installing the vent pipe.
• Do not common vent this appliance with any other vented appliance. (Do not terminate vent into a
chimney. If the vent must go through the chimney, the vent must run all the way through the chimney
with Category III approved or Special BH vent pipe.)
• When the horizontal vent run exceeds 5 ft. (1.5 m), support the vent run at 3 ft. (0.9 m) intervals with
overhead hangers.
• The maximum length of exhaust vent piping must not exceed 50 ft (15.2 m).* Deduct 5 ft (1.5 m) for each
90° elbow used in the venting system. Do not use more than 5 elbows. A 45° elbow is equivalent to 2.5
ft. of vent length.
Installaon
Installaon Manual
Vent type Diameter Max. No. of Elbows Max. Vertical and Horizontal (Total) Vent Length
Intake 5 in. (127 mm) 5 50 ft (15.2 m )*
Exhaust 5 in. (127 mm) 5 50 ft (15.2 m )*
*For each 90° elbow added, deduct 5 ft. (1.5m) from max. vent length.
No. of Elbows
Max. Vertical or Horizontal
Vent Length
No. of Elbows
Max. Vertical or Horizontal
Vent Length
0 50 ft (15.2 m) 3 35 ft (10.7 m)
1 45 ft (13.7 m) 4 30 ft (9.1 m)
2 40 ft (12.2 m) 5 25 ft (7.6 m)
Excludes elbow termination, rain caps, or the 5 in. (127 mm) Concentric termination.
Standard Vent Terminations
-Indoor installation diagrams-
Single Pipe with Room-Air Intake
*Backflow preventer (Recommended for freezing weather conditions:
36 °F (2 °C) and below).
**Vertical condensation drain must be installed in accordance with
local codes.
Vercal Installaon
Roof
ashing
Roof
Fire stop
Hanger
Vertical
condensation
drain**
Backflow
preventer*
Rain cap
Horizontal Installaon
Wall
Sidewall vent
terminaon
Vertical
condensation
drain**
Backflow
preventer*
Hanger
18 Page
Direct vent installaons
Vercal Installaon
Roof
ashing
Roof
Fire stop
Hanger
Vertical condensation
drain**
Backflow preventer*
Rain cap
Horizontal Installaon
Wall
Sidewall vent
terminaon
Vertical condensation drain**
Back flow preventer*
Hanger
Installaon
Installaon Manual
-Clearances for sidewall terminaons-
NOTE: Refer to page 14 for the correct DIP switch settings.
Exhaust and/
or direct
vent sidewall
terminations
should be at least
2 ft (610 mm) away
from an opposite
surface/wall. Do
not place the
termination directly
in front of an opening
into a building.
Ancipated Snow level
Exhaust
Terminaon
2
(610 mm)
min.
1
(305 mm)
min.
1
(305 mm)
min.
Inside
corner
Exhaust
termination
2 ft (610 mm) min.
Inside
corner
Ancipated Snow level
2
(610 mm)
min.
1
(305 mm)
min.
1
(305 mm)
min.
Combined
intake and
exhaust
terminaon
Multiple Sidewall Terminations
An exhaust termination must be
at least 1 ft (305mm) away from
another exhaust termination. An
exhaust termination must also be
at least 2 ft (610 mm) away from
an inside corner. (If the adjacent
wall is less than 2 ft (610 mm) of
length, the minimum required
distance away from the inside
corner will be equal to the length
of that adjacent wall.)
Multiple DV Sidewall
Terminations
A direct vent (DV) termination
must be at least 1 ft (305 mm)
away from other direct vent
terminations.
A direct vent termination must
also be at least 2 ft (610 mm)
away from an inside corner. (If
the adjacent wall is less than
2 ft (610 mm) of length, the
minimum required distance
away from the inside corner will
be equal to the length of that
adjacent wall.)
*Backflow preventer (Recommended for freezing weather conditions:
36 °F (2 °C) and below).
**Vertical condensation drain must be installed in accordance with
local codes.
Improper installation can result in carbon monoxide poisoning or death. Follow all local
and national codes in regards to proper termination clearances. In the absence of such
codes, the clearances below must be met. Local codes supersede these clearances.
Failure to observe this warning may result in severe personal injury or death.
WARNING
Direct vent sidewall
terminations
that use two separate
penetrations for
the intake and
exhaust, distance the
intake and exhaust
terminations at
least 3 ft (915 mm)
away from each
other, no matter the
orientation.
Ancipated Snow level
3
(915 mm)
min.
3
(915 mm)
min.
1
(305 mm)
min.
Air supply
inlet
Air supply
inlet
Air supply
inlet
Exhaust
terminaon
19 Page
Installaon
Installaon Manual
-Clearances for rooop terminaons-
• Exhaust terminations must be at least 1 ft (305 mm) away from any obstructions.
• Minimum spacing between multiple terminals:
• intake terminals: 1 ft (305 mm) spacing between each
• exhaust terminals: 1 ft (305 mm) spacing between each
• The exhaust termination must be a horizontal distance of at least 2 ft (610 mm) from a
wall or surface unless specified differently by local code.
• Failure to observe this warning may result in severe personal injury or death.
WARNING
Flat roof terminationAngled roof termination
Vercal wall
1
(305 mm)
min.
2
(610 mm)
min.
2
(610 mm)
min.
1
(305 mm)
min.
1
(305 mm)
min.
1
(305 mm)
min.
1
(305 mm)
min.
3 (914 mm) min.
Exhaust gas
Exhaust gas
Intake air
Intake air
Ancipated snow level
1
(305 mm)
min.
Multiple flat roof terminations
Exhaust
gas
Exhaust
gas
Intake air
Intake air
1
(305 mm)
min.
1
(305 mm)
min.
1
(305 mm)
min.
1
(305 mm)
min.
Ancipated snow level
1
(305 mm)
min.
2 (610 mm) min.
Multiple angled roof terminations
• In lieu of using roof caps, a 90 degree elbow and 45 degree elbow can be used for the exhaust, and
two 90 degree elbows can be used for the air intake.
3 ft (914 mm) min.
1 ft
(305 mm) min.
1 ft
(305 mm) min.
Intake air
Exhaust
gas
Anticipated
snow level
2 ft (610 mm) min.
1 ft
(305 mm) min.
1 ft
(305 mm) min.
Intake air
Exhaust
gas
Anticipated
snow level
Improper installation can result in carbon monoxide poisoning or death. Follow all local
and national codes in regards to proper termination clearances. In the absence of such
codes, the clearances below must be met. Local codes supersede these clearances.
Failure to observe this warning may result in severe personal injury or death.
WARNING
Canadian requirements differ from the guidelines in this section. In Canada, follow the
requirements of B149.1 (Natural Gas and Propane Installation Code, current edition)
as well as local and provincial codes. Contact your local code enforcement agency for
direction.
NOTICE
20 Page
Installaon
Installaon Manual
-Vent terminaon clearances-
H
D
E
L
B
V
V
V
V
B
F
C
B
B
B
V
V
V
V
V
X
X
A
J
M
Operable
Fixed
closed
Fixed
closed
Operable
B
Inside corner
detail
G
A
K
V
X
= Vent terminal
= Air supply inlet
= Area where the terminal
is not permied
Regulator/Gas meter
vent outlet
I
Canada Installations
1
US Installations
2
Direct vent and other than
direct vent
Direct
vent
Other than
directdvent
A Clearance above grade, veranda, porch, deck, or balcony 1 ft (30 cm) 1 ft (30 cm)
B Clearance to window or door that may be opened 3 ft (91 cm)
1 ft
(30 cm)
4 ft (1.2 m) below or to
side of opening; 1 ft (30
cm) above opening
C Clearance to permanently closed window 0 0 0
D
Vertical clearance to ventilated soffit located above the
vent terminator within a horizontal distance of 2 feet
(61cm) from the center line of the terminator
3 ft (91 cm)
3 ft
(91 cm)
3 ft (91 cm)
E Clearance to unventilated soffit 3 ft (91 cm)
3 ft
(91 cm)
3 ft (91 cm)
F Clearance to outside corner 2 ft (61 cm)
2 ft
(61 cm)
2 ft (61 cm)
G Clearance to inside corner 2 ft (61 cm)
2 ft
(61 cm)
2 ft (61 cm)
H
Clearance to each side of center line extended above
meter/regulator assembly
3 ft (91 cm) * *
I Clearance to service regulator vent outlet
Above a regulator within 3
ft (91 cm) horizontally of the
vertical center line of the
regulator vent outlet to a
maximum vertical distance of
15 ft (4.5 m)
* *
J
Clearance to non-mechanical air supply inlet to build-
ing or the combustion air inlet to any other appliance.
3 ft (91 cm)
1 ft
(30 cm)
4 ft (1.2 m) below or to
side of opening; 1 ft (30
cm) above opening
K Clearance to mechanical air supply inlet 6 ft (183 cm)
3 ft (91 cm) above if within
10 ft (3 m) horizontally.
L
Clearance above paved sidewalk or paved driveway
located on public property
7 ft (213 cm)**
7 ft
(213 cm)
7 ft (213 cm)
M Clearance under veranda, porch deck, or balcony 1 ft (30 cm)***
1 ft (30
cm)***
1 ft (30 cm)***
*Clearances in accordance with local installation codes and the requirements of the gas supplier.
**A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings
and serves both dwellings.
***Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
Notes:
1) In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code
2) In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code
21 Page
GAS SUPPLY AND GAS PIPE SIZING
-General-
• Do not use this water heater with any gas other than the one listed on the rating
plate.
• Ensure that any and all gas regulators used are operating properly and providing gas
pressures within the specified range shown below. Excess gas inlet pressure may
cause serious accidents.
• Conversion of this unit from natural gas to propane or vice versa will void all
warranty. Contact your local distributor to get the correct unit for your gas type. The
manufacturer is not liable for any property and/or personal damage resulting from
gas conversions.
• Failure to observe these warnings could result in severe personal injury, carbon
monoxide poisoning, or death.
WARNING
• Minimum and maximum inlet gas pressures:
Gas type Inlet gas pressure
Natural Gas Min. 4.0” W.C. (1.00 kPa) – Max. 10.5” W.C. (2.61 kPa)
Propane Min. 8.0” W.C. (1.99 kPa) – Max. 14.0” W.C. (3.48 kPa)
• Inlet gas pressures that fall outside the range of values listed above may adversely affect the
performance of the water heater. These pressures are measured when the water heater is in full
operation and when it is in stanby.
• Inlet gas pressure must not exceed the above maximum values; gas pressure above the specified range
will cause dangerous operating conditions and damage to the unit.
• Until testing of the main gas line supply pressure is completed, ensure the gas line to the water heater
is disconnected to avoid any damage to the water heater.
• If the gas supply pressure to the heater is greater than the specified maximum, a field-supplied
regulator is required. The regulator must lower the gas pressure within the approved range.
• Install the gas regulator according to the manufacturer's instructions.
• The regulator must be sized for the water heater input and provide the specified pressures that
are listed on the rating plate.
• In the absence of minimum install distance, it is recommended that the gas regulator be installed
no closer than 3 ft (1 m) from the water heater's inlet gas connection.
-Gas connecons-
1. Install a full port, manual gas shutoff valve between the water heater and the gas supply line.
2. When the gas connections are completed, perform a gas leak test either by applying soapy water to all
gas fittings and observing for bubbles or by using a gas leak detection device.
• The water heater and its individual shutoff valve must be disconnected from the gas supply
piping system during any pressure testing of that system at test pressures in excess of 1/2 psi
(3.5 kPa).
• The water heater must be isolated from the gas supply piping system by closing its individual
manual shutoff valve during any pressure testing of the gas supply piping system at test
pressures equal to or less than 1/2 psi (3.5 kPa).
3. Always purge the gas line of any inert gas, debris, and/or water before connecting to the gas inlet.
Size the gas pipe to supply the necessary volume of gas for the water heater. Refer
to and follow the requirements listed in the current edition of ANSI Z223.1/NFPA
54 (USA), B149.1 (Canada), or local codes. Otherwise, flow capabilities and output
temperatures will be limited.
NOTICE
Installaon
Installaon Manual
22 Page
Based on Energy
Content of 1,000
BTU/Cubic ft:
Divide each
appliance's BTU/h
requirement by
1,000 BTU/ft
3
to get
the appliance's ft
3
/h
requirement.
Take into account
the distance the
appliance is from
the gas meter,
then look in the
above gas chart to
properly size the
line.
For sections of the gas line supplying gas to more than one appliance (Ex: Point A to Point B), add up the cubic ft
per hour requirements of the appliances that are being supplied by that section, and size to the farthest appliance.
For Example: The section from A to B supplies gas to the furnace, range and dryer. Adding up the BTU/h
requirements and dividing by 1,000 yields a cubic ft per hour requirement of 220 cubic ft of gas per hour. The
farthest appliance is the range, which is 60 ft (18.3 m) away from the meter. According to the chart above, the
60-ft (18.3 m) column shows that Section A to B must be 1" in order to supply 220 cubic ft per hour.
Water
heater
380,000 BTU/h
Dryer
35,000 BTU/h
Gas meter
Furnace
120,000 BTU/h
Range
65,000 BTU/h
A
B
C
10' (3.1 m) Length
1/2" Pipe size
15' (4.6 m) Length
1/2" Pipe size
15' (4.6 m) Length
3/4" Pipe size
10' (3.1 m) Length
3/4" Pipe size
10' (3.1 m) Length
1" Pipe size
10' (3.1 m) Length
1-1/2" Pipe size
20' (6.1 m) Length
1-1/4" Pipe size
10' (3.1 m) Length
1-1/2" Pipe size
Gas sizing example
(Natural Gas)
Installaon
Installaon Manual
Pipe Size Length: ft (m)
Diameter:
in.
10'
(3.0)
20'
(6.1)
30'
(9.1)
40'
(12.2)
50'
(15.2)
60'
(18.3)
70'
(21.3)
80'
(24.4)
90'
(27.4)
100'
(30.5)
125'
(38.1)
150'
(45.7)
200'
(61.0)
1/2"
172 118 95 81 72 65 60 56 52 50 44 40 34
3/4"
360 247 199 170 151 137 126 117 110 104 92 83 71
1" 678 466 374 320 284 257 237 220 207 195 173 157 134
1
1/4"
1,309 957 768 657 583 528 486 452 424 400 355 322 275
1
1/2"
2,090 1,430 1,150 985 873 791 728 677 635 600 532 482 412
2" 4,020 2,760 2,220 1,900 1,680 1,520 1,400 1,300 1,220 1,160 1,020 928 794
Unit: Cubic feet per hour
-Natural gas supply piping-
Maximum delivery Capacity in Cubic Feet of Gas per Hour (based on IPS Pipe carrying Natural Gas with 0.60 Specific
Gravity with a Pressure Drop of 0.5" W.C.).
Based on Energy Content of 1,000 BTU/Cubic ft; The water heater requires 380 Cubic ft/hr.
The following tables are from NFPA 54.
Unit: kBTU per hour
Pipe Size
Length: ft (m)
Diameter
10'
(3.0)
20'
(6.1)
30'
(9.1)
40'
(12.2)
50'
(15.2)
60'
(18.3)
70'
(21.3)
80'
(24.4)
90'
(27.4)
100'
(30.5)
125'
(38.1)
150'
(45.7)
200'
(61.0)
1/2"
268 184 148 126 112 101 93 87 82 77 68 62 53
3/4"
567 393 315 267 237 217 196 185 173 162 146 132 112
1"
1,071 732 590 504 448 409 378 346 322 307 275 252 213
1
1/4"
2,205 1,496 1,212 1,039 913 834 771 724 677 630 567 511 440
1
1/2"
3,307 2,299 1,858 1,559 1,417 1,275 1,181 1,086 1,023 976 866 787 675
2"
6,221 4,331 3,465 2,992 2,646 2,394 2,205 2,047 1,921 1,811 1,606 1,496 1,260
-Propane (LP) supply piping-
Maximum Capacity of Propane (LP) Based on 11" W.C. supply pressure at a 0.5" W.C. pressure drop
23 Page
Installaon
Installaon Manual
WATER CONNECTIONS
5. There is a wire mesh filter within the cold inlet
to trap debris from entering your heater. This
will need to be cleaned periodically to maintain
optimum flow. (Refer to p. 40.)
All pipes, pipe fittings, valves and other components, including soldering materials, must be suitable for
potable water systems.
1. A manual shutoff valve must be installed on the cold water inlet to the water heater between the
main water supply line and the water heater.
2. In addition, a manual shutoff valve is recommended on
the hot water outlet of the unit. Isolation valves are
recommended.
3. If the water heater is installed within, or subjected
to, a closed loop water system, a thermal expansion
tank or a code approved device to handle thermal
expansion must be installed.
Do not use this appliance if any part has been under water. Immediately contact a
qualified installer or service agency to replace a flooded water heater. Do not attempt
to repair the unit! It must be replaced! Failure to follow these instructions could lead to
property damage, personal injury, or loss of life.
WARNING
Do not reverse the hot outlet and cold inlet connections to the water heater. This will
prevent the water heater from activating properly.
NOTICE
4. Before installing the water heater, flush the water
line to remove all debris, and after installation is
complete, purge the air from the line. Failure to
do so may cause damage to the water heater.
-Pressure relief valve-
The water heater has a high-temperature shutoff switch built in as a standard safety feature (called a
Hi-Limit switch). Therefore, a “pressure only” relief valve is required.
• This unit does not come with an approved pressure relief valve.
• An approved pressure relief valve must be installed on the hot water outlet.
• The pressure relief valve must conform to the current edition of ANSI Z21.22 or CAN 1-4.4 and installation must
follow local codes.
• The discharge capacity must be at least 380,000 BTU/h.
• The pressure relief valve must be rated for a maximum of 150 psi (1 MPa).
• The discharge piping for the pressure relief valve must be directed so that the hot water cannot splash outward
and cause damage or personal injury.
• Attach the discharge tube to the pressure relief valve and run the end of the tube to within 6 in. (152 mm) from
the floor. This discharge tube must allow free and complete drainage without any restrictions.
• If the pressure relief valve installed on the water heater discharges periodically, this may be due to a defective
thermal expansion tank or defective pressure relief valve.
• The pressure relief valve must be manually operated periodically to check for correct operation.
• No valve shall be placed between the relief valve and the water heater.
• For the ASME model, the pressure relief valve must conform to and be installed in accordance with ASME code.
Cold
inlet
Hot
outlet
Gas
inlet
As Close as
Possible
Pressure
relief valve
WARNING
Hot water could be released when the pressure relief valve is opened. This
could result in severe personal injury. Contact with discharge may cause prop-
erty damage and/or bodily harm. Before operating the pressure relief valve
manually, check that it will discharge in a safe place. If water does not flow
freely from the end of the discharge pipe, turn the gas supply and power OFF
and call a qualified person to determine the cause.
Refer to the pressure relief valve manufacturer's instructions for inspection and
maintenance requirements.
24 Page
ELECTRICAL CONNECTIONS
• Ensure that circuit power is turned OFF before you complete the following steps.
• Follow the electrical code requirements of the local authority having jurisdiction. In
the absence of such requirements, follow the current edition of the National Electrical
Code ANSI/NFPA 70 in the U.S. or the current edition of CSA C22.1 Canadian Electrical
Code Part 1 in Canada
• When servicing or replacing parts within the water heater, label all wires prior to dis-
connection to facilitate an easy and error-free reconnection. Wiring errors can cause
improper and dangerous operation. Verify proper operation after servicing.
• Failure to follow these instructions can result in fire, electrical shock, or death.
WARNING
1. The water heater must be electrically grounded. Do not attach the
ground wire to either the gas or the water piping.
2. The water heater requires a 120 VAC, 60 Hz electrical power supply that
is properly grounded.
• A proper disconnect (i.e. on/off switch, power plug, etc.) controlling
the main power to the water heater must be provided for service
reasons. (Must comply with local codes.)
• Connect the power supply to the water heater exactly as shown in
the wiring diagram.
3. A green screw is provided in the junction box to ground the connection.
4. Can be hardwired or wired to a plug-in.
5. The use of a surge protector is recommended in order to protect the unit
from power surges.
Installaon
Installaon Manual
Connecting the remote controller to the water heater
1. Disconnect the power supply from the water heater.
2. Take off the water heater’s front cover.
3. Locate the two terminals for the remote controller inside the water heater.
4. Put the remote controller cable through the hole at the bottom of the water heater's casing from outside.
5. Connect the two terminals attached to the end of the remote control cables to the terminals near the
computer board as shown below. (No polarity)
* Do NOT jump or short-circuit the wires, or the computer will be damaged.
6. Replace the water heater's front cover securely.
Connect to these terminals.
Connect the other end to these terminals.
Front of remote
Back of remote
Remote controller terminals
of the water heater
Ground
Connect
power supply
120VAC/60HZ
REMOTE CONTROLLER CONNECTION
• This remote controller is NOT waterproof.
• The water heater can only have one remote controller.
• Do not install in high temperature environments, steamy conditions (such as a
bathroom), outdoors, in direct sunlight, or within the reach of children.
• Make sure the remote controller does not come into contact with water or oil.
• Failure to observe these warnings could result in electrical shock.
WARNING
This water heater can be connected to a remote controller 100112155 (TM-RE30). Refer to the instruc-
tions attached to the remote controller for details.
• Do not place the remote controller cable close to other wires from other products.
• Cables used for the remote controller connection must be:
• Minimum 20 gauge wire (No polarity)
• Maximum 400 ft (122 m) long
NOTICE
25 Page
Installaon
Installaon Manual
EXTERNAL FAN MOTOR CONNECTION
This water heater can be connected to a external fan motor so that it can activate when the water heater
requires more combustion air. Refer to the following diagram and the instructions of the fan motor manu-
facturer. Disconnect the power supply from the water heater.
These components are NOT
included with the 910 model and
are external to the unit. They
must be purchased seperately.
Disconnect the power supply
from the water heater.
Failure to do so can result in
electrical shock.
WARNING
PUMP CONTROL CONNECTIONS
The 910 can be used to control a recirculation pump. Proper pump control helps to preserve the life of the
system and saves energy as well. The water heater pump control port is a “normally-open” dry contact,
and therefore needs additional components to properly control a recirculation pump. To control the
recirculation pump, connect the pump via a field supplied relay to the "pump terminal" on the 910 center
computer board as shown in the diagram below. (The pump terminal is essentially only a dry contact.
An external power supply and relays are required to operate the pump.) Please make sure the relays are
properly rated for the recirculation pump.
Using the 910 internal thermistors as a temperature control, the recirculation pump will only turn on
when recirculation is needed, depending on the control mode selected. See the next section.
In an Easy-Link System, the pump must be connected only to the Pump terminal in the PARENT
unit. If the pump is connected to any of the CHILD units, the pump will not work. These
components are NOT included with water heaters and are external to the unit. They must be
acquired separately.
NOTICE
-Pump control mode-
The 910 provides the four types of the pump control modes. The pump control modes are selected by changing
the Dip switches located on the upper bank of the center computer board. (See the following diagrams.)
A) Recirculaon Control: DIP SW No. 4 ON
Five minutes after the heater goes into
standby, the heater will activate the
recirculation pump. It will run the pump
for one minute, monitoring the water
temperature. The pump will stop if the
water in the circulation line has not
cooled more than 9 °F (5 °C) from the
set temperature. The heater will repeat
this process 30 minutes later. The pump
will continue to run if the water has
cooled more than 9 °F (5 °C) from the set
temperature until the line has reheated.
If the inlet thermistor detects the water
temperature has cooled more than 9 °F (5
°C) from the set temperature during the
standby period, it will activate the pump to
reheat the circulation loop.
Center computer board
In an Easy-Link System, this connection
must be made on the parent unit.
External fan motor
Pump control
terminals*
Fan motor control
terminals*
Connect to these terminals located
on the center computer board
Power supply
for external
fan motor
120VAC
240VAC
Power
supply
for
relays
120VAC
*Max voltage allowed on these terminals: 240VAC
Connect to the pump control
terminals*.
Power supply for relay
Power supply for
pump 120 VAC
220 VAC etc
120 VAC
220 VAC
etc for
relay
Thermal
relay
Recirculaon
pump
These components are
NOT included with water
heaters and are external
to the unit. They must be
acquired separately.
*Max voltage allowed on these terminals: 240VAC
26 Page
Installaon
Installaon Manual
Pump Control Modes
A) Recirculation Control
ON
87654321
B) Storage Tank
Circulation Control
ON
87654321
C) Energy Conserving
Recirculation
ON
87654321
D) Normal Control
Recirculation (DEFAULT)
ON
87654321
TWO UNIT PRIORITY
Both combustion sections will activate with demand when the two unit priority DIP switch is set to ON. The
minimum activation flow rate requirement will increase from 0.5 gpm (1.9 L/M) to 1.0 gpm (3.8 L/M) in this
mode. This mode is useful for applications requiring high demands. Adjust the following DIP switch on
the upper bank on the center computer board after disconnecting power-supply. Refer to the Warning
above and the DIP switch location diagram above.
Combustion priority
Two unit priority
ON
87654321
Standard operating
mode
(DEFAULT)
ON
87654321
B) Storage Tank Circulaon Control: DIP SW No. 5 ON
The 910 will heat the water 5.4 °F (3 °C) higher than its set temperature unless it is set at 185°F (85°C).
This is to ensure a higher rate of recovery for storage tank applications. The circulation pump (from
storage tank to 910) will always remain running.
C) Energy Conserving Recirculaon: DIP SW No. 4 and No. 5 ON
This pump control mode is similar to the Recirculation Control mode. It will run the pump for one minute,
monitoring the water temperature. The pump will stop if the water in the circulation line has not cooled
below 95 °F (35 °C). The heater will repeat this process 20 minutes later. The pump will continue to run if
the water has cooled below 95 °F (35 °C) until the line has reheated. If the outlet thermistor detects the
water temperature has cooled below 95 °F (35 °C) during the standby period, it will activate the pump to
reheat the circulation loop. If operating the pump in this mode, insulation is recommended on the water
piping.
D) Normal Control (Default seng): DIP SW No. 4 and No. 5 OFF
The pump runs continuously and will not provide pump control. This will reduce the heater's warranty
unless the pump is controlled by an aqua stat. Refer to your product warranty for details.
Upper bank of DIP switches
on the center computer board
WARNING
• Adjust the appropriate DIP switches as shown below. DO NOT adjust the
other DIP switches.
• Turn off the power supply to the water heater before changing the DIP
switch settings.
• Failure to observe these warnings could lead to carbon monoxide poisoning
or death.
27 Page
EASY-LINK SYSTEM
Thewaterheatercanbeconnectedwithotherheatersofthesame modelwithcommunicationcablesto
workasamultiplemanifoldsystem.
• TheEasy-LinkSystemcanconnectupto4units.
• Acommunicationcable(graycolor)comeswitheachunit.Thecablesuse18gagewireandcanbeup
to250ft(76.2m)longalltogether.
Youcanmanifoldfrom2unitsto4unitswithoutamulti-unitcontroller.A4-unitsystemhasfullautomatic
modulationbetween15,000BTU/hand1,520,000BTU/h.
Gas In
Hot Out
Cold In
• The Easy-Link System is limited to up to 4 units. If you connect more than 4 units,
only the first 4 units will work as a part of the Easy-Link System. The other additional
units will not work.
• A remote controller is not required for an Easy-Link System. However, it does provide
for more temperature options and ease of maintenance.
• If a remote controller is used, the temperature on all the units in the system will auto-
matically be set to the same temperature that is set on the remote.
• When a remote is used in an Easy-Link System, it must be connected to the parent unit.
NOTICE
-Easy-Link Connecon Procedures-
1. Make sure the power to the heaters is turned off.
2. Verify the DIP switch set temperatures of all units within the system. Every water heater must be set
to the same set temperature. If an optional remote controller 100112155 (TM-RE30) is used, it shall
be installed to the PARENT unit. (See the diagram on the naxt page.) The remote will set the tem-
perature for the entire system.
3. Select one unit to be the PARENT unit. The PARENT unit should be one of the end units.
4. PARENT unit:
Locate the lower bank of DIP switches at the bottom left of the center computer board. Change DIP
switch No. 8 on the lower bank of DIP switches to the ON position. See the computer board diagram
shown on the next page. Do not change any DIP switches on any of the CHILD units.
5. Between the PARENT and the CHILD-1 units:
Connect the PARENT connector of the PARENT unit to the 1 connector of the CHILD-1 unit using the
supplied linking cable.
6. Between the CHILD-1 and the CHILD-2 units:
Connect the 2 connector of the CHILD-1 unit to the 1 connector of the CHILD-2 unit.
7. Between the CHILD-2 and the CHILD-3 units:
Connect the 2 connector of the CHILD-2 unit to the 1 connector of the CHILD-3 unit.
8. Verify that all cables are connected like the diagram (B).
9. Turn on power to the PARENT unit. When the 7-seg. LED of the center computer board of the PARENT
unit displays a number, turn on CHILD-1. When the 7-seg. LED of the center computer board of the
CHILD-1 unit displays a number, turn on CHILD-2. When the 7-seg. LED of the center computer board
of the CHILD-2 unit displays a number, turn on CHILD-3. Make sure the 7-seg. LEDs of all the center
computer board of each unit displays each unit number. The numbering system automatically allo-
cates the unit number to each water heater in the Easy-
Link System, in accordance with the table shown below.
10. Set the desired temperature on the controller attached
to the PARENT unit. If a controller is not installed, set
the temperature DIP switches on each heater as shown
in the table located at the bottom of page 38.
Installaon
Installaon Manual
Type of unit Unit # of easy-link
Parent 1
Child 2, 3, or 4
28 Page
Installaon
Installaon Manual
• A remote controller is not required for an Easy-Link System. However, it does
provide for more temperature options and ease of maintenance.
• If a remote controller is used, the temperature on all units in the system will
automatically be set to the same temperature that is set on the remote.
NOTICE
WARNING
• To change the DIP switch settings for an Easy-Link System, locate the lower
bank of DIP switches at the bottom, left of the center computer board.
• DO NOT adjust any other DIP switches .
• Turn off the power supply to the water heater before changing the DIP switch
settings.
• Failure to observe this warning could result in carbon monoxide poisoning or death.
(A) 910 model Computer board and connection
Easy-Link/Mul-Unit System
connectors
7-Seg LED
This LED will turn on when the heater is
properly linked in the Easy-Link system.
Lower bank of DIP switches
(B) Basic diagram of connections between units in an Easy-Link System
Remote controller
NOTE: The black squares indicates the correctDIPswitchpositions.
PARENT unit CHILD-1 unit CHILD-2 unit CHILD-3 unit
Communicaon
cable
Connectors
Lower bank of
DIP switches
OFF
ON
1
2
3
4
5
6
7
8
PARENT
2
1
Connectors
Lower bank of
DIPswitches
OFF
ON
1
2
3
4
5
6
7
8
PARENT
2
1
Connectors
Lower bank of
DIP switches
OFF
ON
1
2
3
4
5
6
7
8
PARENT
2
1
Connectors
Lower bank of
DIP switches
OFF
ON
1
2
3
4
5
6
7
8
PARENT
2
1
29 Page
Installaon
Installaon Manual
• Each heater's No.8 DIP switch, located on the center computer board's lower bank of DIP switches,
should be in the OFF position.
• The diagram above shows an example of a Multi-Unit controller connected to six water heaters.
• The multi-unit controller automatically allocates the unit number (1-10) to each water heater
that is part of the Multi-Unit System. Make sure each 7-Seg LED of all the units’ center computer
boards displays the unit number. The lower LED will illuminate when the heater has linked to the
controller.
• In a Multi-Unit System, connect the “[1]” connector and the “[2]” connector with the
communication cable (refer to p. 9) or 18 gauge wire cables. The total cable length can be up to
250 ft (76.2 m) long.
MULTI-UNIT SYSTEM
Multiple 910 models can be combined for a Multi-Unit System, along with the multi-unit controller
100112691(TM-MC02). Each multi-unit controller can control from 2 to 10 units for commercial or
residential applications. For a 10-unit system, the computer can modulate from 15,000 BTU/h to
3.8 million BTU/h.
An individual cut-off switch is recommended for each unit in a Multi-Unit System for the purpose of
maintenance.
Mul-unit
controller
Hot Out
Cold In
Multi-Unit System connection diagram
Multi-unit controller and temperature remote controller wiring:
For detailed instructions on the multi-unit controller, refer to the
instructions that are packaged with the multi-unit controller.
NOTICE
Multi-communication terminals
Each terminal : Max. 4 units
Multi-unit
controller
Communication cable
Water
heater
1
Water
heater
2
Water
heater
3
Water
heater
4
Water
heater
5
Water
heater
6
1
2
123
6
4
5
O
N
123
6
4
5
O
N
1
2
1
2
1
2
1
2
1
2
Temperature
remote
controller
Temperature
remote controller
terminals
DIP switch settings for Multi-Unit System
Lower bank of DIP switches
NO.8: 0FF
(Default)
ON
87654321
30 Page
APPLICATIONS
SPACE-HEATING APPLICATIONS
RECIRCULATION
*The recirculation pump is to be controlled by:
-Dual-set aquastat (recommended w/timer)
• The aquastat's differential should be a minimum of 10 °F (5 °C).
*The recirculation pump is to provide no less than 2 GPM (7.5 L/min) and no more than 4 GPM (15 L/min) through
each activated unit in the system. Refer to the heaters specification sheet on the manufacturer's website for
pressure drop information.
• This water heater is suitable for combination water (potable) heating and space
heating and not suitable for space heating applications only.
• In order to purge air in water pipes within a closed-loop system, an air vent and
air separator should be installed in the system. Required circulation flow rates are
labeled next to each application diagram. These flow rate requirements must be
followed.
• Toxic chemicals used in boiler treatments such as alcohol, glycerol and glycol groups
must not be introduced into the system.
• The water heater can be used to supply combination potable water and space
heating and shall not be connected to any heating system or component(s)
previously used with non-potable water where any chemicals were added to the
water heating appliances.
• When the system requires water for space heating at temperatures higher than
required for other uses, a means such as a mixing valve shall be installed to temper
the water for those other uses in order to reduce scald hazard potential.
• Water temperature over 125 °F (52 °C) can cause severe burns instantly or death
from scalding.
WARNING
Air vent
Hot water outlet to xtures
Recirculaon
pump
Air
separator
S
Check valve
Check valve
Y-Strainer
Cold water inlet
Expansion tank
Gas supply
Ball valves
Unions
Hot water outlet
Cold water inlet
Gas inlet
Pressure
relief valve
This is a concept drawing only.
Applicaons
Installaon Manual
31 Page
Applicaons
• Priority Control Devices such as a flow switch, an Aquastat or other
electronic controller can be used to prioritize the domestic water system over
the heating system.
• Follow all local codes, or in the absence of local codes, follow the current
edition of the National Standard Code, ANSI Z21.10.3 ・ CSA 4.3.
• This illustration is a concept design only. The reference to the 1/8-inch hole
in the check valve is only required in the State of Massachusetts. There are
a wide variety of variations to the application of controls and equipment
presented. Designers must add all necessary safety and auxiliary equipment
to conform to code requirements and design practice. For more details,
contact the manufacturer or local code authority.
NOTICE
DUAL-PURPOSE HOT WATER HEATING
(Domestic and Space Heating):
Diagrammatic layout of radiant heating and domestic water heater.
The recirculation pump is to provide no less than 2 GPM (7.5 L/min) and no more than 4 GPM (15 L/min)
through each activated unit in the system
Ball
Valve
Isolation
Valve
120 VAC
switch or
outlet
Hot water outlet
Unions
T-handle gas shuto valve
Check valve
Electronically controlled
pump mer. Acvates
every 6 hours for 60
seconds. Wire to
product approved pump
Heang Coil
(used with air-handler)
Cold water supply
5" Gas Exhaust vent
(Discharge must
comply with local and
state codes.) Cannot
be common vented
with other appliances
An approved temperature and pressure
relief valve. Tie to locaon approved by
local codes and must meet BTU rang of
water heater model used
Check valve will have
1/8-inch hole drilling
in clapper.
Atmospheric
vacuum
breaker
Shuto
valve
Pressure
gauge
Apply correct thermal
expansion tank-size
per applicaon
Shuto valves
Shuto valves
Check valves
Cold water inlet
Gas inlet
Water
lter
Drain
plug
Thermostac mixing valve
Hot water
supply and
return to
heang coil
System installed with reverse
acng aquastat to shut o fan.
Suggested but not required by
248 CMR
50’-0” MAXIMUM DISTANCE FROM
WATER HEATER TO FAN COIL AND
BACK (DEVELOPED LENGTH) NOT
INCLUDING COIL IN HEATING UNIT.
NSF-61 product
approved pump
Automac tempering device
must be installed below
the top of the water heater
as per manufacturer’s
recommendaons
Piping loop
between water
heater and fan
coil shall be in
compliance with
248 CMR
Tempered water to
plumbing xtures. Must
meet temperature
requirements of 248 CMR
All water piping should be insulated
in accordance with 780 CMR
(Massachuses energy code)
Water heater
accepted by
the Board for
installation in
Massachusetts.
Installaon Manual
32 Page
INITIAL OPERATION
Operation
1.
Once the above checks have been completed, please clean the filter
of any debris. Refer to p. 40 for instructions.
2.
Fully open the manual water control valve on the water supply line.
3.
Open a hot water tap to verify that water is flowing to that tap, then
close the hot water tap.
4.
Fully open the manual gas control valve.
5.
Turn on the 120 VAC, 60 Hz power supply to the water heater.
6.
Now you are ready to enjoy hours of endless hot water.
• Check the GAS and WATER CONNECTIONS for leaks before firing the unit for the first time.
• Open the main gas supply valve to the unit using only your hand to avoid any spark. Never use
tools. If the knob will not turn by hand, do not try to force it; call a qualified service technician.
Forced repair may result in a fire or explosion due to gas leaks.
• Be sure to check for the presence of leaking gas toward the bottom of the unit because some
gases are heavier than air and may settle toward the floor.
• Check the GAS PRESSURE. Refer to pp. 21 and 40.
• Do not try to light the burner manually. It is equipped with an electronic ignition device which
automatically lights the burner.
• Check for PROPER VENTING and COMBUSTIBLE AIR to the water heater.
• Purge the GAS and WATER LINES to remove any air pockets.
• Do not use this water heater if any part has been submersed under water. Do not attempt to
repair the unit. It must be replaced. Failure to follow these instructions could lead to property
damage, personal injury, or loss of life.
FOR YOUR SAFETY, READ BEFORE OPERATING
Inial operaon
Installaon Manual
IF YOU SMELL GAS:
• Do not try to start the water heater.
• Do not touch any electric switches; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor’s phone. Follow the gas
supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
WARNING
33 Page
Owner's Guide
CONGRATULATIONS
Congratulations and thank you for choosing our tankless water heater.
Before use, we recommend that you read through this owner's guide
carefully. Keep this manual for future reference.
If you need an additional manual, contact the manufacturer or your
local distributor. When you call, please tell us the product name and
the serial number of your unit written on the rating plate of the water
heater.
Owner's Guide
34 Page
OPERATING SAFETY
Operang Safety
Owner's Guide
WARNING:
If you do not follow these instructions exactly, a re or explosion may result
causing property damage, personal injury or loss of life.
A.Thisappliancedoesnothaveapilot.Itisequippedwithanignitiondevicewhichautomatically
lightstheburner.Donottrytolighttheburnerbyhand.
B.BEFOREOPERATINGsmellallaroundtheapplianceareaforgas.Besuretosmellnextto
theoorbecausesomegasisheavierthanairandwillsettleontheoor.
WHATTODOIFYOUSMELLGAS
• Donottrytolightanyappliance.
• Donottouchanyelectricswitch;donotuseanyphoneinyourbuilding.
• Immediatelycallyourgassupplierfromaneighbor’sphone.Followthegassupplier’s
instructions.
• Ifyoucannotreachyourgassupplier,calltheredepartment.
C.Useonlyyourhandtoturnthegasshutoffvalve.Neverusetools.Ifthevalvewillnotturnby
hand,don’ttrytorepairit,callaqualiedservicetechnician.Forceorattemptedrepairmayresult
inareorexplosion.
D.Donotusethisapplianceifanyparthasbeenunderwater.Immediatelycontactaqualied
installerorserviceagencytoreplaceaoodedwaterheater.Donotattempttorepairtheunit!It
mustbereplaced!
1. STOP!Readthesafetyinformationaboveonthislabel.
2. Turnoffallelectricpowertotheappliance.
3. Donotattempttolighttheburnerbyhand.
4. Turnthegasshutoffvalvelocatedontheoutsideoftheunittotheclosedposition.
5. Waitve(5)minutestoclearoutanygas.Ifyouthensmellgas,STOP!Follow“B”inthe
safetyinformationaboveonthislabel.Ifyoudon’tsmellgas,gotothenextstep.
6. Turnthegasshutoffvalvelocatedontheoutsideoftheunittotheopenposition.
7. Turnonallelectricalpowertotheappliance.
8. Iftheappliancewillnotoperate,followtheinstructionsin“ToTurnOffGastoAppliance,”and
callyourservicetechnicianorgassupplier.
1. Turnoffallelectricpowertotheapplianceifserviceistobeperformed.
2. Turnthegasshutoffvalvelocatedontheoutsideoftheunittotheclosedposition.
FOR YOUR SAFETY READ BEFORE OPERATING
OPERATING INSTRUCTIONS
TO TURN OFF GAS TO APPLIANCE
35 Page
Operang Safety
Owner's Guide
ApressurereliefvalvelistedascomplyingwiththestandardforReliefValveandAutomaticGasShutoff
DevicesforHotWaterSupplySystem,ANSIZ21.22
・
CSA4.4,shallbeinstalledatthetimeofinstallation
ofthewaterheaterinthelocationspeciedbythemanufacturer.Localcodesshallgoverntheinstallationof
reliefdevicesforsafetyoperationofthewaterheater.Thereliefvalvemustnotberemovedorplugged.
Novalveshallbeplacedbetweenthe reliefvalve andthewaterheater.The relieffromthedischargeof
thepressurereliefvalveshallbedisposedofinasuitableplacewhereitwillcausenodamage.Also,there
shallbenootherreducingcouplingorotherrestrictionsinstalledonthedischargelinetorestrictow.
SeeInstallationManualheading“PRESSURE RELIEFVALVES”for installationandmaintenanceofrelief
valvedischargelineandothersafetyprecautions.
Vapors from ammable liquids will explode and catch re causing death or severe burns.
Donotuseorstoreammableproductssuchasgasoline,solventsoradhesivesinthesameroomor
areanearthewaterheater.
Keepammableproducts:
1. Farawayfromheater.
2. Inapprovedcontainers.
3. Tightlyclosedandoutofreachofchildren.
4. Waterheaterhasamainburner,whichmay
comeonatanytimeandwilligniteammable
vapors.
Vapors:
1. Cannotbeseen.
2. Areheavierthanair.
3. Goalongwayontheoor.
4. Canbecarriedfromotherroomstothemain
burnerbyaircurrents.
Donotinstallwaterheaterwhereammableproductswillbestoredor
usedunlessthemainburnerisatleast18”abovetheoor.This
willreduce,butnoteliminatetheriskofvaporsbeingignitedbythe
mainburner.
Read and follow water heater warnings and instructions. If the owner’s
manual is missing, contact the retailer or manufacturer.
FlammableVapors
FLAMMABLES
1. Watertemperatureover125°F(52°C)cancausesevereburnsinstantlyordeathfrom
scalds.
2. Children,disabledandelderlyareathighestriskofbeingscalded.
3. Feelwaterbeforebathingorshowering.
4. Temperaturelimitingvalvesareavailable.Seemanual.
5. Theoutlettemperatureofthewaterheaterissetat120°F(50°C).Ifyourequirewater temperatures
belowthissetting,followtheinstructionmanual.
6. Usethisheateratyourownrisk.Testthewaterbeforebathingorshowering.Donotleavechildrenor
aninrmpersonunsupervised.Seeyourlocalwatersupplycompany[plumbinghardwareretailer]for
temperaturelimitingvalvesthatareavailable.
BRÛLURE
BURN
CHAUDECHAUDE
HOTHOT
CHAUDE
HOT
DANGER
DANGER
36 Page
Normal Operaon
Owner's Guide
WITH REMOTE CONTROLLER
NORMAL OPERATION
GENERAL
Temperatures above 125 °F (52 °C) can cause severe burns or death from scalding.
Children, disabled and the elderly are at high risk of being injured.
WARNING
°F 120 125 130 135 140 145 150 155
°C 49 52 54 57 60 63 66 68
Time to produce
serious burn
more
than 5
min.
1½ to 2
min.
about
30 sec.
about
10 sec.
less than
5 sec.
less than
3 sec.
about
1½ sec.
about
1 sec.
• Flow rate to activate the water heater: 0.5 gallon per minute at the default set
temperature (1.9 L/min).
• Flow rate to keep the water heater running: 0.4 gallon per minute (1.5 L/min).
NOTICE
1. Open a cold water
fixture.
2. Mix hot water with the cold water
to get the correct temperature water.
3. When finished, close the
water fixtures.
No. Description Note No. Description Note
1
"ON/OFF"
Button
Press this button to start or stop
operation.
5
"TIME"
Button
Press this button to set the
current time.
2
"HOT"
Button
Press the "HOT" button or the
"COLD" button to set the outlet
water temperature, the current
time, and PUMP TIMER.
6
LCD
The current time, set temperature,
error code and other information
are displayed.
3
"COLD"
Button
7
"BUZZER"
Button
Press this button to set and con-
trol the buzzer function.
4
"INFO."
Button
Press the "INFO." button to dis-
play the inlet & outlet water tem-
perature and water flow and set
the outlet temperature, pump
selection, and unit conversion.
8
BURNING
The LED lights during combustion.
9
STAND BY LED
The LED lights when power is on.
100112155(TM-RE30)-Optional accessory
6 85
2
3
9
174
• Please read the instructions carefully before
installing the remote.
• The controller has an energy saving mode. Five
minutes after the water heater stops operating, the
backlight of the controller turns off.
• The backlight of the remote will turn back on once
the water heater begins firing again.
NOTICE
37 Page
-Set temperature-
Normal Operaon
Owner's Guide
-Temperature tables of controller-
1. Turn on the 120 VAC power supply to the unit.
2. Press the "ON/OFF" button on the controller in order to turn the controller on.
When ON, the STAND BY LED is lit. The set temperature of the output water appears on its display.
3. Press the "HOT" button or the "COLD" button to set the temperature setting of the unit.
To increase the temperature from 120 °F (50 °C) to 140 °F (60 °C):
Press the "HOT" button to set 120 °F (50 °C).
Press and hold the "INFO" button and the "HOT" button for at least 3 seconds.
The remote will emit a beep and change to 125 °F (52 °C).
Press the "HOT" button to set up to 140 °F (60 °C).
To increase the temperature above 140 °F (60 °C):
Press the "HOT" button to set 140 °F (60 °C).
Press and hold the "INFO" button and the "HOT" button for at least 3 seconds.
The remote will emit a beep and change to 145 °F (63 °C).
Press the "HOT" button to set up to 175 °F (80 °C) or 185 °F (85 °C) -must be set to
High Temperature Mode. See the high temperature mode procedure below.
I N
OUT
FLOW
L/M
G/M
°F 100 105 110 115 120* 125 130 135 140 145 150 155 160 165 170 175
°C 38 40 43 45 50* 52 55 57 60 63 65 68 70 75 77 80
a) Default mode
b) High temperature mode
*Factory setting (Default): 120 °F (50 °C)
°F 110 115 120* 125 130 135 140 145 150 155 160 165 170 175 180 185
°C 43 45 50* 52 55 57 60 63 65 68 70 75 77 80 82 85
To change the remote controller’s mode from Default mode to High Temperature mode:
1. Turn off power to the remote controller by pressing the "ON/OFF" button.
2. Simultaneously press and hold both the "HOT" and "COLD" buttons for at least 5 seconds. Make sure that "1"
(or "0" for Easy-Link System or Multi-Unit System) is displayed on remote controller.
3. Press the "TIME" button. Make sure that "OFF" and "F1" are displayed on remote controller.
4. Press the "INFO" button and make sure that "OFF" blinks.
5. Press the "HOT" button or the "COLD" button to set display to "on".
6. Simultaneously press both the "BUZZER" button and the "INFO" button to approve the setting.
7. Make sure that the display is no longer blinking.
8. Press the "ON/OFF" button to finish the setting.
9. Turn on power to the remote controller by pressing the "ON/OFF" button again.
These images show the procedure's results on the display (listed in sequential order).
• DO NOT set temperature above 180°F (82°C) if you use your water heater in a recir-
culation system. This will cause damage to the heater and void the warranty.
• Water temperatures over 125 °F (52 °C) can cause severe burns instantly or death
from scalding.
WARNING
<Set the time>
1. Press the "TIME" button, then press the "HOT" or "COLD" button to set the clock time.
2. Press the "TIME" button again to save and exit.
NOTE: If you want to hide the clock time, press and hold the "TIME" button for 3 seconds or longer.
<Buzzer operation and Error code>
If there is a problem with the unit, the remote controller will sound a buzzer and display the error code to inform you the source
of the problem.
You can stop the buzzer by pressing the "BUZZER" button. Refer to pp.44 and 45 for error codes.
NOTE: If you want to disable the buzzer operation, press and hold the "BUZZER" button for 3 seconds or longer.
-Other funcons-
I N
OUT
FLOW
L/M
G/M
I N
OUT
FLOW
L/M
G/M
I N
OUT
FLOW
L/M
G/M
I N
OUT
FLOW
L/M
G/M
I N
OUT
FLOW
L/M
G/M
I N
OUT
FLOW
L/M
G/M
OR
Blinks
Blinks
38 Page
Normal Operaon
Owner's Guide
<Information mode>
You can get some information about the water heater condition by pressing the "INFO" button. The following information will
be displayed seqentially by pressing the "INFO" button.
I N
OUT
FLOW
L/M
G/M
I N
OUT
FLOW
L/M
G/M
I N
OUT
FLOW
L/M
G/M
I N
OUT
FLOW
L/M
G/M
Inlet water temperature Outlet water temperature Finish Water flow
<Unit conversion mode>
The remote controller has a function that can change units of temperature and flow rate from “°F and GPM” to “°C
and Liter/min”.
To change the remote controller’s unit mode
1. Turn off power to the remote controller by pressing the "ON/OFF" button.
2. Simultaneously press and hold both the "HOT" and "COLD" buttons for at least 5 seconds. Then make sure "1"
(or "0" for Easy-Link System or Multi-Unit System) is displayed on remote controller.
3. Press the "TIME" button. Make sure "OFF" and "F1" are displayed on remote controller.
4. Press the "HOT" button or the "COLD" button to set display to "F3".
5. Press the "INFO" button and make sure "°F" blinks.
6. Press the "HOT" button or the "COLD" button to set display to "°C".
7. Simultaneously press both the "BUZZER" button and the "INFO" button to fix the setting.
8. Make sure that the display is no longer blinking.
9. Press the "ON/OFF" button to finish the setting.
10. Turn on power to the remote controller by pressing the "ON/OFF" button again.
These images show the procedure's results on the display (listed in sequential order).
I N
OUT
FLOW
L/M
G/M
I N
OUT
FLOW
L/M
G/M
I N
OUT
FLOW
L/M
G/M
I N
OUT
FLOW
L/M
G/M
I N
OUT
FLOW
L/M
G/M
I N
OUT
FLOW
L/M
G/M
OR
Blinks
I N
OUT
FLOW
L/M
G/M
Blinks
WARNING
• To change the DIP switch settings for set temperature, locate the lower bank
of DIP switches at the bottom of the center computer board.
• DO NOT adjust any other DIP switches .
• Turn off the power supply to the water heater before changing the DIP switch
settings.
• Failure to observe this warning could result in carbon monoxide poisoning or death.
TEMPERATURE SETTINGS ON THE COMPUTER BOARD
• There are eight preset temperatures that you can select by changing the DIP switch settings on the computer board.
• The temperature has been preset at the factory to 120 °F (50 °C).
• If you desire to change the set temperature with DIP switches on the computer board, refer to the diagram below
and observe the warnings.
• If you desire a hot water temperature other than the eight preset settings, purchase the optional temperature
remote controller 100112155 (TM-RE30).
• With this optional remote controller, you can set the temperature from 100 °F to 185 °F (38 °C to 85 °C) in various
increments.
Temperature settings ( Lower bank of DIP switches)
100 °F (38 °C)
ON
87654321
145 °F (63 °C)
ON
87654321
115 °F (46 °C)
ON
87654321
155 °F (68 °C)
ON
87654321
120 °F (50 °C)
DEFAULT
ON
87654321
165 °F (74 °C)
ON
87654321
135 °F (57 °C)
ON
87654321
185 °F (85 °C)
ON
87654321
Lower bank of DIP switches
on the center computer board
39 Page
FLOW
Appliance/Use
Flow rate
GPM (US) L/min
Lavatory Faucet
1.0 3.8
Bath Tub
4.0 – 10.0 15.2 - 37.8
Shower
2.0 7.5
Kitchen Sink
1.5 5.6
Dishwasher
1.5 5.6
Washing machine
4.0 15.2
Household Flow Rates
Taken from UPC 2006
• The flow rate through the water heater is limited to
a maximum of 14.5 GPM (54.9 L/min).
• The temperature setting, along with the supply
temperature of the water, will determine the flow
rate output of the unit.
• Please refer to the temperature vs. gallons per
minute charts on p. 52 to determine the likely flow
rates based on your local ground water temperature
and your desired outlet water temperature.
• Refer to the table on the right for typical household
plumbing fixture flow rates to determine what the
water heater can do in a household application.
Normal Operaon
Owner's Guide
FREEZE PROTECTION SYSTEM
• This unit comes equipped with heating blocks to protect it from damage associated with freezing.
• For this freeze protection system to operate, there has to be electrical power to the unit. Damage
to the heat exchanger caused by freezing temperatures due to power loss is not covered under the
warranty. In cases where power losses can occur, consider the use of a backup power supply.
• The freeze protection system will activate when the air temperature inside the case or water in the
heat exchanger is less than 36.5 °F (2.5 °C).
• In any areas subject to freezing temperatures, the manufacturer highly recommends an indoor instal-
lation with an indoor model. In such an installation, freezing issues can occur if cold air enters through
the venting into the heat exchanger, whether by negative pressures within the installation location or
by strong outside winds.
• The manufacturer also highly recommends the use of a backflow preventer (sold separately)
to minimize the amount of cold air entering through the exhaust venting when the water heater is off.
• It is the installer’s responsibility to be aware of freezing issues and take all preventative measures. The
manufacturer will not be responsible for any damage to the heat exchanger as a result of freezing.
• If you will not be using your heater for a long period of time:
1. Completely drain the water out of the unit. Refer to p. 40.
2. Disconnect power to your heater.
This will keep your unit from freezing and being damaged.
Only pipes within the water heater are protected by the freeze protection system. Any
water pipes (hot or cold) located outside the unit will not be protected. Properly protect
and insulate these pipes from freezing.
NOTICE
MAINTENANCE AND SERVICE
Turn off the electrical power supply and close the manual gas shutoff valve and the
manual water control valve before servicing. Failure to do so could result in serious
personal injury or death.
WARNING
• Clean the cold-water inlet filter. (Refer to "Unit Draining and Filter Cleaning" on the following page.)
• Be sure that all openings for combustion and ventilation air are not blocked.
• The venting system should be checked annually for any leaks, corrosion, blockages or damage.
• The burner should be checked annually for dust, lint, grease or dirt.
• Keep the area around the water heater and terminations clear. Remove any combustible materials,
gasoline, flammable vapors, and liquids.
• If the relief valve discharges periodically, it may be due to thermal expansion in a closed water supply
system. Contact the water supplier or local plumbing inspector on how to correct this situation.
• Visually check the burner flames (see the following page) through the burner window in the burner
assembly located at the middle of the water heater.
40 Page
UNIT DRAINING and FILTER CLEANING
1. Close the manual gas shutoff valve.
2. Turn off power to the unit and wait a couple of seconds. Turn on again.
3. Wait 30 seconds, and then turn off power to the unit.
4. Close the inlet water valve.
• If the heater is part of an Easy-Link or Multi-Unit System, close the inlet and
outlet water valves to isolate the heater. Then proceed to step 6.
5. Open all hot water taps in the house. When the residual water flow has
ceased, close all hot water taps.
6. Have a bucket or pan to catch the water from the unit’s drain plugs. If Isolation
valves are installed, open the drains to drain the water. If isolation valves are not
installed, unscrew the two drain plugs (large and small) to drain the water out of
the unit. Do not lose the o-rings that will be on the two drain plugs.
7. Wait a few minutes to ensure all water has completely drained from the unit.
8. Clean the filter: Check the water filter located within the cold inlet. With a tiny brush,
clean the water filter of any debris which may have accumulated and reinsert the filter
back into the cold water inlet.
9. Securely screw the drain plugs back into place.
Hand- tighten only.
Normal Operaon
Owner's Guide
Sasfactory
Blue ame
Unsasfactory
Flame liing
above the
burner
Unsasfactory
Red or Yellow
ame
The manufacturer recommends having the unit checked once a year or as necessary by a licensed technician. If
repairs are needed, any repairs should be done by a licensed technician.
1. Shut off the manual gas valve on the gas supply line.
2. Remove the screw for the pressure port located on the gas inlet of the water heater
shown in the diagram on the right.
3. Connect the manometer to the pressure port and zero manometer.
4. Re-open the manual gas valve. Verify that there are no gas leaks.
5. With all gas burning equipment off, take a reading of the static gas pressure and make a note
of it.
6. Measure gas supply pressure at maximum heater operation: Open up water faucets to create maximum flow.
Press and hold the MAX buttons on the left and right computer boards simultaneously. Take a reading of the
supply dynamic gas pressure with all gas burning equipment run-
ning at maximum rate.
7. The static and dynamic pressures should be within the ranges
specified on the heater's rating plate and the table on p. 21.
8. The difference of static to dynamic pressure should not exceed
1.5" W.C. (0.374 kPa) Pressure drops that exceed 1.5" W.C. (0.374
kPa) can indicate restricted gas flow, undersized gas lines, and/
or undersized supply regulators. In Canada, refer to B149.1 for
allowable pressure drops.
9. Measure gas supply pressure at minimum heater operation:
Reduce water flow so the heater is running at mini mal operation.
Press the MIN button on the right or left computer board in com-
bustion operation. (Refer to the right diagram.) Take a supply gas pressure reading and verify that it is within
the specified inlet gas pressure range.
-Measuring inlet gas pressure-
The water heater cannot perform properly without sufficient inlet gas pressure. Below are instructions
on how to check the inlet gas pressure. THIS IS ONLY TO BE DONE BY A LICENSED PROFESSIONAL.
1. Turn off all electric power to the water heater if service is to be performed.
2. Turn the manual gas valve located on the outside of the unit to the OFF position.
3. Failure to follow these steps could lead to fire or explosion, resulting in personal injury or death.
WARNING
Inlet water
valve
Drain plug
(Small)
Drain plug with Filter (Large)
Gas
valve
Pressure
relief valve
Left
computer board
Right
computer board
Center computer board
Max. button
Min. button
41 Page
TROUBLESHOOTING
GENERAL
PROBLEM SOLUTIONS
TEMPERATURE and AMOUNT OF HOT WATER
It takes a long time to
get hot water at the
fixtures.
• The time it takes to deliver hot water from the water heater to your
fixtures depends on the length of piping between the two. The longer
the distance or the bigger the pipes, the longer it will take to get hot
water.
• If you would like to receive hot water to your fixtures more quickly, you
may want to consider a hot water recirculation system. (p. 30)
The water is not hot
enough.
• Compare the flow and temperature. See the charts on p. 52.
• Check cross plumbing between cold water lines and hot water lines.
• Is the gas supply valve open fully? (p. 32)
• Is the gas line sized properly? (pp. 21 and 22)
• Is the gas supply pressure within specified limits? (pp. 21 and 40)
• Is the set temperature set too low? (pp. 37 and 38)
• Is the Easy Link or Multi-Unit system set up correctly?
The water is too hot. • Is the set temperature set too high? (pp. 37 and 38)
The hot water is not
available when a
fixture is opened.
• Make sure the unit has 120 VAC, 60 Hz power supply.
• Is the power button on the controller or inside the water heater turned
on?
• Is the gas supply valve open fully? (p.32)
• Is the water supply valve open fully? (p. 32)
• Is the filter on the cold water inlet clean? (p. 40)
• Is the hot water fixture sufficiently open to draw at least 0.5 GPM
(1.9 L/min) through the water heater? (p. 36)
• Is the unit frozen? (p. 39)
• Check for cross plumbing between the hot and cold water lines.
• Is the Easy Link or Multi-Unit system set up correctly?
• Is there enough gas in its tank? (for propane)
The hot water turns
cold and stays cold.
• Is the flow rate enough to keep the water heater running? (p. 36)
• If there is a recirculation system installed, does the recirculation line have
enough check valves? (p. 30)
• Is the gas supply valve open fully? (p. 32)
• Is the filter on the cold water inlet clean? (p. 40)
• Are the fixtures clean of debris and obstructions?
Fluctuation in hot
water temperature.
• Is the filter on the cold water inlet clean? (p. 40)
• Is the gas line sized properly? (pp. 21 and 22)
• Is the supply gas pressure within specified limits? (pp. 21 and 40)
• Check for cross connection between cold water lines and hot water lines.
• Is the Easy Link or Multi-Unit system set up correctly?
Troubleshoong
Owner's Guide
42 Page
PROBLEM SOLUTIONS
WATER HEATER
Unit does not ignite
when water goes
through the unit.
• Is the flow rate over 0.5 GPM (1.9 L/min)? (p. 36)
• Check the filter on the cold water inlet. (p. 40)
• Check for reverse connection and cross connection.
• If you use the remote controller, is the power button turned on?
• Check if the inlet water temperature is too high. If it is too close to
the set temperature, the water heater will not activate.
• Is the gas supply turned on?
• Is power available to the unit? If so, is the power button on the
controller or inside the water heater turned on?
The fan motor is
still spinning after
operation has stopped.
• This is normal. After operation has stopped, the fan motor keeps
running from 15 to 70 seconds in order to re-ignite quickly, as well
as purge all the exhaust gas out of the flue.
Unit sounds abnormal
while in operation
• Contact the manufacturer at (USA) 1-877-737-2840.
(Canada) 1-888-479-8324.
REMOTE
CONTROLLER
Remote controller does
not display anything
when the power
button is turned on.
• Make sure the unit is supplied with power.
• For the remote controller: Make sure the connection to the unit is
correct. (p. 24)
• When the unit has not operated for five minutes or more, the dis-
play turns off to conserve energy.
An ERROR code is
displayed.
• Please see pp. 43 to 45.
EASY-LINK SYSTEM
How are the unit
numbers assigned?
• For an Easy-Link System, the Parent unit is always labeled #1 and all
other subsequent Child units are numbered randomly.
• To check which numbers are assigned to which Child units, push the
Unit # display button on the center computer board of any Child
unit as shown below. The unit number will be displayed on the
controller of each Child unit. (Refer to p. 27.)
• You can renumber water heaters so they are numbered any way
you like. Press and hold the Unit # display button on all Child units
for at least 5 seconds. Zero will be displayed on all Child units. Press
the Unit number display button again in the order you want them
numbered. New unit number will be assigned in order as you
proceed through every unit.
Troubleshoong
Owner's Guide
Central computer board
Unit # display button
7-Seg LED
43 Page
Troubleshoong
Owner's Guide
-Error code display-
• 7-Seg LED on the center computer board:
A three digit error code will be displayed on the 7-Seg LED one number at a time.
• Remote controller:
A three digit error code will be displayed on the screen.
When the right and/or left combustion section has an error code, the red LED next to the 7-Seg LED
on the center computer board will flash to indicate which combustion section has the error code.
Refer to the graphics above.
Example: If your unit has the “321” error code (which signifies an inlet thermistor failure):
7-Seg LED
I N
OUT
FLOW
L/M
G/M
Remote
-Easy-Link System-
The 7-Seg LED on the PARENT unit displays a 5-digit number to signify which unit in the Easy-Link system has the
error, and what the error code is. The 7-Seg LED displays the number one digit at a time. The remote controller
100112155 (TM-RE30) (if installed) displays a 3-digit number which also signifies which unit has the error, and what
the error code is. The unit that has the error in an Easy-Link system will display the error code on its 7-Seg LED in
exactly the same way as if it were only a Single Unit. When the right and/or left combustion section has an error
code, the red lamp next to the 7-Seg LED on the center computer board will flash to indicate which combustion
section has the error code. Refer to the diagram below.
Example: If Unit #2 has the “321” error code (inlet thermistor)
• The 7-Seg LED on the PARENT unit will display “3”...“2” “1” “0” “2”, displaying only one digit at a time. The first
3 numbers indicate the error code. The last two numbers indicate that Unit #2 has the error.
• The remote controller, however, will display
“232” on its screen. The first “2” indicates
that Unit #2 has the error. The “32” indicates
the first two digits of the “321” error code.
• The 7-Seg LED on Unit #2 will display “3”. “2”.
“1”, just like in the Single Unit example.
ERROR CODES
-General-
• The units have self-diagnostic functions for safety and convenience when troubleshooting.
• If there is a problem with the installation or the unit, the error code will be displayed on the 7-Seg LED on the
center computer board and remote controller (if it is installed.)
• Consult the table on the following pages for the description of each error code.
Upper bank of DIP
switches
Lower bank of DIP
switches
7-Seg
LED
First red lamp:
It ashes when the right
combuson secon has
an error code.
Second red lamp:
It ashes when the le
combuson secon has
an error code.
Remote controller (Optional)
100112155(TM-RE30)
Unit#1
PARENT
Unit#2
CHILD
Unit#3
CHILD
Unit#4
CHILD
Remote
Controller
“3”..”2”..”1”..”0”..”2”
“3”..”2”..”1"
44 Page
-Fault Analysis of Error Codes-
If the error code is displayed on the computer board of the water heater or the controller, please check
the following. After checking, consult with the manufacturer.
Troubleshoong
Owner's Guide
Error
code
Malfunction
description
Diagnosis
031
Incorrect DIP
switch setting
• Check the DIP switches settings on the PCB (Part #701).
101
Warning for the
“991” error code
• Check the gas type of the water heater matches the gas supplied to it.
• Check if there is any blockage in the intake air and/or exhaust.
• If the water heater is installed as a direct-vent system, check whether there is
enough distance between the intake air terminal and the exhaust terminal.
• Check if there is grease and/or dirt in the burner (Part #101) and the fan
motor (Part #416), especially if the water heater has been installed in a
contaminated area.
• Check the DIP switches match gas type of unit.
• Check the manifold pressure at Max. and Min.
• Check the proportional gas valve hose.
111*
Ignition failure • Check if the Hi-limit switch (Part #403) is properly functioning.
• Check for connection/breakage of wires, burn marks on the computer
board (Part #701), and/or soot on the flame rod (Part #103).
• Check if there is a buzzing spark ignition sound coming from the burner
(Part #101) when the water heater prepares for combustion.
• Listen for the double “clunk” sound coming from gas valve assembly
(Part#114) when the water heater goes into combustion.
• Check if there is leaking from the heat exchanger (Part #401).
• Check that the gas is turned on.
• Check the gas supply.
121*
Loss of flame • Check if the Hi-limit switch (Part #403) is functioning properly.
• Check for connection/breakage of wires, burn marks on the computer
board (Part #701), and/or soot on the flame rod (Part #103).
• Check if there is leaking from the heat exchanger (Part #401).
• Check gas supply
311*
Outlet thermistor
failure
• Check for connection/breakage of wires and/or debris on thermistor.
• Check the resistance.
321*
Inlet thermistor
failure
331*
Mixing thermistor
failure
391*
Air-fuel ratio rod
failure
• Check for connection/breakage of wires and/or soot on the AFR rod.
441*
Flow sensor
failure (Easy-Link
System only)
• Check for connection/breakage of wires and/or debris on the flow sensor
impeller.
• Check that the water isolation valves are open.
• Check inlet water filter for debris.
510
Abnormal main
gas valve
• Check for connection/breakage of wires and/or burn marks on the com-
puter board.
• Check for signs of vent corrosion.
• Check gas valve contacts and gas valve wire harness connections for signs
of rust or corrosion.
551
Abnormal gas
solenoid valve
• Check for connection/breakage of wires and/or burn marks on the com-
puter board.
• Check gas valve contacts and gas valve wire harness connections for signs
of rust or corrosion.
*These error codes will be cleared when water flow stops.
45 Page
Troubleshoong
Owner's Guide
*These error codes will be cleared when water flow stops.
Error
code
Malfunction
description
Diagnosis
611*
Fan motor fault • Check for connection/breakage of wires, dust buildup in the fan motor
(Part #416) and/or burn marks on the computer board (Part #701).
• Check for frozen/corrosion of connectors.
631
Abnormal external
pump
• Check whether the pump connected to center computer board works
properly.
651*
Flow adjustment valve
fault
• Inspect the flow adjustment valve for connection/breakage of wires,
locked motor drive due to scale buildup, and/or water leakage.
• Visual inspection of PCB: connection/breakage of wires and/or burn
marks on the computer board.
661*
Water control valve
fault
(Bypass function)
• Inspect the flow adjustment valve, for connection/breakage of wires,
locked motor drive due to scale buildup, and/or water leakage.
• Visual inspection of PCB: connection/breakage of wires and/or burn
marks on the computer board.
681
Abnormal external fan
motor
• Check whether the external fan motor connected to center computer
board works properly.
701*
Computer board fault
• Check for connection/breakage of wires and/or burn marks on the
computer board.
• Check the power supply of the water heater.
721*
False flame detection • For indoor models, check if condensate drain is installed on the vent
collar of the water heater.
• Check if there is leaking from the heat exchanger (Part #401).
741
Miscommunication
between
water heater and
remote controller
• Check the model type of the remote controller.
• Inspect the connections between the water heater and remote con-
troller.
• Check the power supply of the water heater.
761
Miscommunication
in Easy-Link
System
• Check if the connections between the parent unit and the Child units
are correct. Refer to p. 28.
• Check that the power is on to all Child units.
991*
Imperfect
combustion
• Make sure that the gas type of the water heater matches the gas
supplied to it.
• Inspect the environment around the water heater. Determine how
long the unit has been installed.
• Check if there is any blockage in the intake air and/or exhaust.
• If the water heater is installed as a direct-vent system, check whether
there is enough distance between the intake air terminal and the
exhaust terminal.
• Check if there is grease and/or dirt in the burner (Part #101) and
the fan motor (Part #416), especially if the water heater has been
installed in a contaminated area.
• Make sure that the DIP switches match the gas type of unit.
• Check the manifold pressure at Max. and Min.
• Check the proportional gas valve hose.
46 Page
COMPONENTS DIAGRAM
Components Diagram
Owner's Guide
Case assembly
3
7
6
13
3
11
4
10
1
12
3
3
3
4
2
4
2
3
5
9
8
4
718
Computer board assembly
709
416705
707 706
708
704
418 703
715
701
719
113
708
702
710
712
713
711
714
113
711
113 113 716
416705
707 706
708
704
418 703
709
715
701
719
113
720
721 714
113
113
717
722
723
The 910/910 ASME models share the same components.
47 Page
Components Diagram
Owner's Guide
Burner assembly
114
115
116
705
113
113
117
707
707
102
121
119
118
707
707
109
112
106
111
105
113
113
104
103
108
107
113
110
101
114
115
116
113
113
117
707
707
102
121
119
118
707
707
109
112
106
111
105
113
113
104
103
108
107
113
110
101
123
124
126
125
3
123
122
120
705
The 910/910 ASME models share the same components.
48 Page
Components Diagram
Owner's Guide
Combustion and Exhaust assembly
3
132
133
136
135
137
402
401
403
404
406
407
408
409
411
113
412
413
414
415
113
416
405
402
401
403
404
406
407
408
409
411
113
412
413
414
415
113
416
405
417
133
134
131
128
130
127
129
137
113
417
138
139
139
138
T-M50 ASME /
444
445
446
446
447
910 ASME
Other than Part# 444, Part# 445, Part# 446 and Part# 447, the 910/910 ASME models share the same
components.
49 Page
Components Diagram
Owner's Guide
Water Way assembly
422
419
411
419
411
424
406
407
419
411425
427
423
407
406
425
427
411
419
411
419
422
411
419
411
439
440
441
442
443
429
425
421
411
419
406
407
424
429
425
432
419
411
407
406
430
434
3
433
425
438
437
436
435
113
411
420
419
427
426
418
420
428
421
419
419
426
427
411
411
411
419
431
411
418
430
419
420
419
411
424
406
407
419
411425
427
448
407
406
425
427
411
419
411
419
411
439
440
441
442
443
429
425
421
419
411
406
407
424
429
425
451
407
406
430
434
420
411
418
411
449
421
419
411
450
418
430
3
433
425
438
437
436
435
113
419
411
419
422
422
411
419
427
426
411
427
426
411
419
419
411
419
910 model
910 ASME
model
50 Page
Parts List
Owner's Guide
PARTS LIST
Other than the heat exchanger assembly (No. 444), supply pipe (No. 445), O-ring P18 FKM (No. 446), connection
pipe (No. 447), left cold pipe (No. 448), left hot pipe (No. 449), right hot pipe (No. 450) and right cold pipe (No. 451),
all of the T-M50 ASME / 910 ASME’s components are the same as the T-M50 / 910.
Item # Description
Parts #
910 models T-M50 models
001 Case assembly 100074449 EM305
002 Brackets 100074197 EM335
003 Truss screw M4X10 (w/Washer) SUS410 100074509 EW001
004 Truss screw M4X10 (Coated) SUS3 100074211 EW002
005 Back guard panel 100074421 EM264
006 Power supply cord assembly 100074461 EM333
007 Junction box 100074199 EKJ64
008 Chamber fixing plate 100074414 EM255
009 Rubber bush 100074518 EX00B
010 Exhaust fixing plate 100074420 EM263
011 Front cover 100074446 EM301
012 Air blockage plate 100074430 EM278
013 Truss screw M4X12 (w/Washer) SUS410 100074210 EW000
101 Burner assembly 100074492 EM445
102 Igniter 100074237 EKN74
103 Flame rod 100074220 EKK0E
104 Igniter rod 100074222 EKK0F
105 Damper 100074376 EKK1P
106 Rod cap 100074223 EKN61
107 Burner window 100074218 EKK2V
108 Rod holder gasket 100074219 EKK2W
109 Rod holder 100074221 EKK32
110 Burner holder gasket 100074217 EKK0G
111 High voltage igniter cable 100074224 EKK2M
112 Pan screw M4X8 MFZN 100074244 EW00D
113 Truss Screw M4X10 SUS 100074245 EW003
114
Manifold assembly with gas valve assembly LP 100074447 EM302
Manifold assembly with gas valve assembly NA 100074448 EM303
115 Manifold gasket A 100074229 EKK2Y
116 Manifold gasket B 100074230 EKK2K
117 Igniter plate 100074236 EKK1B
118 Gas connection plate 100074521 EX00J
119 Pan screw M4X10 (w/Washer) 100074247 EW006
120 O-ring P20 NBR (Black) 100074242 EK042
121 Gas pipe left 100074441 EM293
122 Gas pipe right 100074437 EM289
123 O-ring P18 NBR (Black) 100074533 EZP18
124 Gas inlet 100074434 EM284
125 Hex head screw M4x8 FEZN 100074248 EW005
126 Pan screw M4X6 (w/Washer) 100074275 EW00L
127 Exhaust connecter 100074445 EM300
128 Exhaust combining box 100074460 EM331
129 Silicon ring 100074390 EKK3G
130 Exhaust gasket A 100074422 EM266
131 Exhaust gasket B 100074423 EM267
132 Case beam 100074433 EM282
133 Exhaust auxiliary plate 100074459 EM330
134 Duct 100074444 EM299
135 Duct cover 100074442 EM294
136 Duct gasket 100074424 EM268
137 Truss screw M4X10 SUS 100074245 EW003
138 Fan damper 100074332 EK270
139 Screw M3X6 SUS3 Binding head 100074514 EW00B
140 Freeze protection thermostat 100074436 EM286
51 Page
Parts List
Owner's Guide
Item # Description
Parts #
910 models T-M50 models
401 Heat exchanger assembly for 910 100074452 EM308
402 Overheat-cut-off-fuse 100074334 EK333
403 Hi-limit switch 100074280 EKN34
404 Tapping screw M3X6 SUS3 Pan head 100074272 EW00A
405 Output thermistor 100074281 EKK2T
406 Fastener "4-11" 100074282 EKH30
407 O-ring P4 FKM 100076303 EZM04
408 Pipe heater 122 100074408 EKN86
409 Heater fixing plate 100074273 EKK27
411 O-ring P16 FKM 100076308 EZM16
412 Pan Screw M4X12 (w/Washer) 100074246 EW00H
413 Fan motor fixing plate 100074413 EM252
414 Pressure port 100074227 EKK2D
415 Urethane tube 100074528 EX019
416 Fan motor 100074228 EKK25
417 Fuse fixing plate 18 100074251 EKK26
418 Water control valve 100074271 EKH32
419 Fastener "16AG" 100074262 EX01H
420 O-ring P16 FKM 100076308 EZM16
421 Flow sensor 100074277 EKH33
422 Connecting pipe 100074435 EM285
423 Left cold pipe for 910 100074438 EM290
424 Inlet thermistor 100074270 EKK38
425 Heater 502 100074517 EX001
426 Heater 101 100074253 EX002
427 Heater fixing plate 16 100074310 EK031
428 Left hot pipe for 910 100074457 EM328
429 Heater fixing plate 20 100074309 EKH38
430 Mixing thermistor 100074374 EKK1A
431 Right hot pipe for 910 100074440 EM292
432 Right cold pipe for 910 100074439 EM291
433 Heater plate 100074261 EX021
434 Water inlet 100074443 EM295
435 Filter plug 100074255 EM222
436 O-ring P25 FKM 100076551 EZM25
437 Water inlet filter 100074257 EX006
438 O-ring JASO#1021 FKM 100074258 EZN21
439 Water outlet 100074453 EM309
440 Tapping screw SUS3 M4X6 Truss head 100074512 EW009
441 Heater 117 100074407 EKN67
442 Outlet drain plug 100074383 EKK2E
443 O-ring P6 FKM 100076305 EZM06
444 Heat exchanger assembly for 910 ASME 100074454 EM323
445 Connection pipe for 910 ASME 100074455 EM326
446 O-ring P18 FKM 100074532 EZM18
447 Connecting pipe for 910 ASME 100074462 EM370
448 Left cold pipe for 910 ASME 100074494 EM456
449 Left hot pipe for 910 ASME 100074497 EM459
450 Right hot pipe for 910 ASME 100074496 EM458
451 Right cold pipe for 910 ASME 100074495 EM457
701 910 PCB 100074450 EM306
702 MC50 PCB 100074451 EM307
703 PV-FS wire 100074416 EM258
704 Thermistor connecting wire 100074417 EM260
705 Flame rod wire 100074427 EM271
706 Igniter wire 100074415 EM257
707 Gas valve wire 100074432 EM280
708 AC100V wire 100074429 EM277
709 910 PCB cover 100074367 EKH43
710 MC50 PCB cover 100074458 EM329
52 Page
Parts List
Owner's Guide
OUTPUT TEMPERATURE CHART
Chart is based on properly sized gas line
63V051-9
DIR 2000534709 (REV. B)
Item # Description
Parts #
910 models T-M50 models
711 Multi communication wire 100074431 EM279
712 Left communication wire 100074418 EM261
713 Right communication wire 100074419 EM262
714 Remote controller terminal 100074428 EM273
715 Wire cramp 100074233 EM167
716 Left PCB fixing plate 100074425 EM269
717 Right PCB fixing plate 100074426 EM270
718 Transformer 100074312 EM296
719 Truss screw M4X12 Evatite 100074527 EX013
720 Ground fault circuit interrupter 100074411 EM207
721 Flat head screw M3X12 100074515 EW01A
722 Surge box 100074468 EM385
723 Surge connecting wire 100074399 EKK4U
°F 100 105 110 115 120 125 130 135 140 150 160 165 170 175 180 185
GPM (40 °F)
10.1 9.3 8.7 8.1 7.6 7.1 6.7 6.4 6.1 5.5 5.1 4.9 4.7 4.5 4.3 4.2
GPM (50 °F)
12.1 11.0 10.1 9.3 8.7 8.1 7.6 7.1 6.7 6.1 5.5 5.3 5.1 4.9 4.7 4.5
GPM (60 °F)
14.5 13.5 12.1 11.0 10.1 9.3 8.7 8.1 7.6 6.7 6.1 5.8 5.5 5.3 5.1 4.9
GPM (70 °F)
14.5 14.5 14.5 13.5 12.1 11.0 10.1 9.3 8.7 7.6 6.7 6.4 6.1 5.8 5.5 5.3
C°
38 41 43 46 49 52 54 57 60 66 71 74 77 79 82 85
LPM (4 °C)
38.3 35.4 32.8 30.6 28.7 27.0 25.5 24.2 23.0 20.9 19.2 18.4 17.7 17.0 16.4 15.9
LPM (10 °C)
46.0 41.8 38.3 35.4 32.8 30.6 28.7 27.0 25.5 23.0 20.9 20.0 19.2 18.4 17.7 17.0
LPM (16 °C)
54.9 51.1 46.0 41.8 38.3 35.4 32.8 30.6 28.7 25.5 23.0 21.9 20.9 20.0 19.2 18.4
LPM (21 °C)
54.9 54.9 54.9 51.1 46.0 41.8 38.3 35.4 32.8 28.7 25.5 24.2 23.0 21.9 20.9 20.0
Output Temperature vs. GPM (Max. 14.5 GPM) with Various Ground Water Temperature
16.0
(60.6)
14.0
(53.0)
12.0
(45.4)
10.0
(37.8)
8.0
(30.3)
6.0
(22.7)
4.0
(15.2)
2.0
(7.6)
0.0
Output Hot Water GPM (LPM)
40 °F
(4 °C)
50 °F
(10 °C)
60 °F
(16 °C)
70 °F
(21 °C)
*When the set temperature is 150 °F (65.5 °C) or higher, maximum flow rate is limited to 10.6 GPM (40 L/min).
