PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE WHENEVER MAINTENANCE
ADJUSTMENT OR SERVICE IS REQUIRED.
100357051_2000605443BPRINTED 0322
Instruction Manual
COMMERCIAL LIGHT DUTY ELECTRIC WATER HEATERS
Compact 6/10/15/20 Models
Lowboy 30/40/50 Models
Tall 30/40/52 Models
INSTALLATION - OPERATION - SERVICE - MAINTENANCE
LOW LEAD
CONTENT
Thank you for buying this energy efficient water heater. We
appreciate your condence in our products.
Read and understand this instruction
manual and the safety messages
herein before installing, operating or
servicing this water heater.
Failure to follow these instructions and
safety messages could result in death
or serious injury.
This manual must remain with the
water heater.
If the water heater becomes immersed
in water up to or above the level of the
bottom of the element doors, the
heater should be examined by a
qualified service agency before it is
placed in operation.
Electrical Shock Hazard
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2
CONTENTSCONTENTS
SAFE INSTALLATION, USE, AND SERVICE ....................3
Important Denitions .........................................................3
APPROVALS ........................................................................3
GENERAL SAFETY INFORMATION ..................................4
Precautions .......................................................................4
Limiting the Risk of Scalding .............................................4
Hydrogen Gas (Flammable) ..............................................4
Hazard Messages .............................................................4
INTRODUCTION .................................................................7
Preparing for the Installation .............................................7
FEATURES AND COMPONENTS ......................................8
Model and Rating ..............................................................9
INSTALLATION CONSIDERATIONS ...............................10
Locating the Water Heater ...............................................10
Clearances ...................................................................... 11
INSTALLATION ..................................................................12
Required Ability ...............................................................12
General ............................................................................12
Contaminated Water ........................................................12
Circulating Pump .............................................................12
Insulation Blankets ..........................................................12
Temperature-Pressure Relief Valve .................................12
Closed Water Systems ....................................................13
Thermal Expansion .........................................................13
Electrical ..........................................................................13
START UP ..........................................................................15
Limiting the Risk of Scalding ...........................................15
Filling the Water Heater ................................................... 15
Initial Start Up ..................................................................15
Draining the Water Heater ............................................... 15
TEMPERATURE REGULATION .......................................16
Temperature Adjustment .................................................16
MAINTENANCE .................................................................18
Draining and Flushing .....................................................18
Lime Scale Removal .......................................................18
Anode Maintenance ........................................................19
Temperature-Pressure Relief Valve Test .........................19
TROUBLESHOOTING ......................................................21
Checklist ..........................................................................21
Checking for Leaks ..........................................................22
WIRING DIAGRAM ............................................................23
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SAFE INSTALLATION, USE, AND SERVICESAFE INSTALLATION, USE, AND SERVICE
Your safety and the safety of others is extremely important in the
installation, use and servicing of this water heater. Many safety-
related messages and instructions have been provided in this manual
and on your own water heater to warn you and others of a potential
injury hazard. Read and obey all safety messages and instructions
throughout this manual. It is very important that the meaning of each
safety message is understood by you and others who install, use or
service this water heater.
Many safety-related messages and instructions have been provided in this manual and on your own water heater to warn you and others of
a potential injury hazard. Read and obey all safety messages and instructions throughout this manual. It is very important that the meaning
of each safety message is understood by you and others who install, use, or service this water heater.
DANGER
WARNING
CAUTION
CAUTION
DANGER indicates an imminently
hazardous situation which, if not avoided,
will result in injury or death.
This is the safety alert symbol. It is used to alert you to
potential personal injury hazards. Obey all safety
messages that follow this symbol to avoid possible
injury or death. Keep this manual near the water heater.
WARNING indicates a potentially hazardous
situation which, if not avoided, could result
in injury or death.
CAUTION indicates a potentially hazardous
situation which, if not avoided, could result in
minor or moderate injury.
CAUTION used without the safety alert
symbol indicates a potentially hazardous
situation which, if not avoided, could result in
property damage.
All safety messages will generally tell you about the type of hazard, what can happen if you do not follow the safety message, and how
to avoid the risk of injury.
IMPORTANT DEFINITIONS
• Qualied Installer or Service Agency:
Installation and service of this water heater requires ability
equivalent to that of a Qualied Agency (as dened by ANSI
below) in the eld involved. Installation skills such as plumbing,
electrical supply are required in addition to electrical testing skills
when performing service.
• ANSI Z223.1 2006 Sec. 3.3.83:
“Qualified Agency” - “Any individual, firm, corporation or
company that either in person or through a representative is
engaged in and is responsible for (a) the installation, testing
or replacement of gas piping or (b) the connection, installation,
testing, repair or servicing of appliances and equipment; that
is experienced in such work; that is familiar with all precautions
required; and that has complied with all the requirements of the
authority having jurisdiction.”
APPROVALSAPPROVALS
LOW LEAD
CONTENT
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4
GENERAL SAFETY INFORMATIONGENERAL SAFETY INFORMATION
PRECAUTIONS
DO NOT USE THIS WATER HEATER IF ANY PART HAS BEEN
EXPOSED TO FLOODING OR WATER DAMAGE
. Immediately
call a qualied service technician to inspect the water heater and to
replace any part of the control system which has been under water.
If the unit is exposed to the following, do not operate heater until all
corrective steps have been made by a qualied service technician.
1. External re.
2. Damage.
3. Firing without water.
GROUNDING INSTRUCTIONS
This water heater must be grounded in accordance with the National
Electrical Code and/or local codes. These must be followed in all
cases. Failure to ground this water heater properly may also cause
erratic control system operation on ELECTRONIC CONTROL
models.
This water heater must be connected to a grounded metal,
permanent wiring system; or an equipment grounding conductor must
be run with the circuit conductors and connected to the equipment
grounding terminal or lead on the water heater.
LIMITING THE RISK OF SCALDING
For a variety of reasons, water heaters can produce water that is
much hotter than its temperature setting. Take precautions to prevent
this higher temperature water from reaching the water xtures.
Burn Hazard
To reduce the risk of unusually hot
water reaching the fixtures in the
house, install thermostatic mixing
valves at each point of use.
A properly adjusted thermostatic mixing valve at each point of use
allows you to set the tank temperature to a higher setting without
increasing risk of scalds. A higher temperature setting allows the
tank to provide much more hot water and can help provide proper
water temperatures for appliances such as dishwashers and washing
machines.
HYDROGEN GAS (FLAMMABLE)
Explosion Hazard
Flammable hydrogen gases
may be present.
Keep all ignition sources away
from faucet when turning on
hot water.
Hydrogen gas can be produced in a hot water system served by this
heater that has not been used for a long period of time (generally two
weeks or more). Hydrogen gas is extremely ammable. To reduce
the risk of injury under these conditions, it is recommended that the
hot water faucet be opened for several minutes at the kitchen sink
before using any electrical appliance connected to the hot water
system. If hydrogen is present there will probably be an unusual
sound such as air escaping through the pipe as the water begins
to ow.
THERE SHOULD BE NO SMOKING OR OPEN FLAME NEAR
THE FAUCET AT THE TIME IT IS OPEN.
When servicing this unit, verify the power to the unit is turned off prior to opening the control cabinet door.
HAZARD MESSAGES
Read and understand this instruction
manual and the safety messages
herein before installing, operating or
servicing this water heater.
Failure to follow these instructions and
safety messages could result in death
or serious injury.
This manual must remain with the
water heater.
If the water heater becomes immersed
in water up to or above the level of the
bottom of the element doors, the
heater should be examined by a
qualified service agency before it is
placed in operation.
Electrical Shock Hazard
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Burn Hazard
To reduce the risk of unusually hot
water reaching the fixtures in the
house, install thermostatic mixing
valves at each point of use.
Explosion Hazard
Flammable hydrogen gases
may be present.
Keep all ignition sources away
from faucet when turning on
hot water.
● Before removing any access panels or
servicing the water heater, make sure
the the electrical supply to the water
heater is turned OFF.
Electrical Shock Hazard
● Failure to follow these instructions can
result in personal injury or death.
Property Damage Hazard
•
All water heaters eventually leak.
• Do not install without adequate drainage.
CAUTION
Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or shower-
ing.
Temperature limiting devices such as
thermostatic point-of-use mixing
valves must be installed when
required by codes and to ensure safe
temperatures at fixtures.
Explosion Hazard
Temperature-Pressure Relief Valve
must comply with ANSI Z21.22-
CSA 4.4 and ASME code.
Properly sized temperature-
pressure relief valve must be
installed in opening provided.
Can result in overheating and
excessive tank pressure.
Can cause serious injury or death.
Property Damage Hazard
● The temperature-pressure relief-valve discharge pipe
must terminate at an adequate drain.
Full power is present whenever the
cabinet door is opened, even with
the pilot switch turned off.
Electrical Shock Hazard
Burn Hazard
If you choose a higher temperature
setting, install thermostatic mixing
valves at each point-of-use to help
avoid scalding.
Property Damage Hazard
To avoid water heater damage, fill tank with water
before operating.
CAUTION
• Burn hazard.
• Hot water discharge.
• Keep hands clear of drain
valve discharge.
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Burn hazard.
Hot water discharge.
Keep clear of Temperature-
Pressure Relief Valve
discharge outlet.
Avoid damage.
Property Damage Hazard
Inspection and replacement of anode rod required.
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INTRODUCTIONINTRODUCTION
Thank You for purchasing this water heater. Properly installed and
maintained, it should give you years of trouble free service.
Abbreviations Found In This Instruction Manual:
• ANSI - American National Standards Institute
• AHRI - Air-Conditioning, Heating and Refrigeration Institute
• NEC - National Electrical Code
• NFPA - National Fire Protection Association
• UL - Underwriters Laboratory
PREPARING FOR THE INSTALLATION
● Before removing any access panels or
servicing the water heater, make sure
the the electrical supply to the water
heater is turned OFF.
Electrical Shock Hazard
● Failure to follow these instructions can
result in personal injury or death.
1. Read the “General Safety Information” section of this manual
rst and then the entire manual carefully. If you don’t follow the
safety rules, the water heater may not operate safely. It could
cause
DEATH, SERIOUS BODILY INJURY AND/OR PROPERTY
DAMAGE
.
This manual contains instructions for the installation, operation,
and maintenance of the electric water heater. It also contains
warnings throughout the manual that you must read and be
aware of. All warnings and all instructions are essential to the
proper operation of the water heater and your safety.
READ
THE ENTIRE MANUAL BEFORE ATTEMPTING TO INSTALL OR
OPERATE THE WATER HEATER.
Be sure to turn o power when working on or near the electrical
system of the heater. Never touch electrical components with
wet hands or when standing in water. When replacing fuses
always use the correct size for the circuit. See
Wiring Diagram
(page 23).
The model and rating plate on page 9 interprets certain
markings into useful information. Both of these references
should be used to identify the heater, its components and
optional equipment.
2. The installation must conform with these instructions and the
local code authority having jurisdiction and the requirements of
the power company. In the absence of local codes, the installation
must comply with the latest editions of the
National Electrical
Code, NFPA 70
or the
Canadian Electrical Code CSA C22.1.
The
National
Electrical Code
may be ordered from: National Fire Protection
Association, 1 Batterymarch Park, Quincy, MA 02269. The
Canadian Electrical Code
is available from the Canadian Standards
Association, 8501 East Pleasant Valley Road, Cleveland, OH
44131.
3. If after reading this manual you have any questions or do not
understand any portion of the instructions, call the toll free number
listed on the back cover (page 24) of this manual for technical
assistance.
A sample rating plate is shown in
Model and Rating
(page 9).
In order to expedite your request, please have full model and
serial number available for the technician.
4. Carefully plan your intended placement of the water heater.
Examine the location to ensure the water heater complies with
Locating the Water Heater
(page 10).
Installation and service of this water heater requires ability
equivalent to that of a licensed tradesman or qualied agency
in the eld involved. Plumbing and electrical work are required.
See
Important Definitions
(page 3).
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FEATURES AND COMPONENTSFEATURES AND COMPONENTS
This page shows typical water heater installations by model designations.
Lowboy 30/40/50 & All Tall Water Heaters Single-Element Water Heater
Install suitable drain pans under water heaters to prevent
damage due to leakage. See
Locating the Water Heater
(page
10).
Install thermal expansion tank
if check valve or pressure re-
ducing valve is used in supply
line.
Install vacuum relief in cold
water inlet line as required by
local codes.
† OVER CURRENT PROTECTION MUST BE SUPPLIED
IN WATER HEATER CIRCUIT. CONSULT LOCAL CODE OR
CURRENT EDITION OF NEC FOR PROPER INSTALLATION.
* INSTALL IN ACCORDANCE WITH ALL LOCAL CODES.
Figure 1. Typical Water Heater Installations
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9
Table 1. Recovery Capacities
Element
Wattage
(Upper/Lower)
Input
kW
U.S. Gallons/Hr and Liters/Hr at Temperature Rise Indicated
F° 36F° 40F° 54F° 60F° 72F° 80F° 90F° 100F° 108F° 120F° 126F°
C° 20C° 22.2C° 30C° 33.3C° 40C° 44.4C° 50C° 55.5C° 60C° 66.6C° 70C°
NON-SIMULTANEOUS
/1500 GPH 17 15 11 10 8 8 7 6 6 5 5
1.5 LPH 64 58 43 38 32 29 26 23 21 19 18
/2000 GPH 23 20 15 14 11 10 9 8 8 7 6
2.0 LPH 85 77 57 51 43 38 34 31 28 26 24
/2500 GPH 28 25 19 17 14 13 11 10 9 8 8
2.5 LPH 107 96 71 64 53 48 43 38 36 32 30
3000/3000 GPH 34 30 23 20 17 15 14 12 11 10 10
3.0 LPH 128 115 85 77 64 58 51 46 43 38 37
4000/4000 GPH 45 41 30 27 23 20 18 16 15 14 13
4.0 LPH 170 153 114 102 85 77 68 61 57 51 49
4500/4500 GPH 51 46 34 30 25 23 20 18 17 15 14
4.5 LPH 192 173 128 115 96 86 77 69 64 58 55
5000/5000 GPH 56 51 38 34 28 25 23 20 19 17 16
5.0 LPH 213 192 142 128 107 96 85 77 71 64 61
6000/6000 GPH 68 61 45 41 34 30 27 24 23 20 19
6.0 LPH 256 230 170 153 128 115 102 92 85 77 73
SIMULTANEOUS OPERATION
3000/3000 GPH 68 61 45 41 34 30 27 24 23 20 19
6 LPH 256 230 170 153 128 115 102 92 85 77 73
4000/4000 GPH 90 81 60 54 45 41 36 32 30 27 26
8 LPH 341 307 227 205 170 153 136 123 114 102 97
4500/4500 GPH 101 91 68 61 51 46 41 36 34 30 29
9 LPH 384 345 256 230 192 173 153 138 128 115 110
5000/5000 GPH 113 101 75 68 56 51 45 41 38 34 32
10 LPH 426 384 284 256 213 192 170 153 142 128 122
6000/6000 GPH 135 122 90 81 68 61 54 49 45 41 39
12 LPH 511 460 341 307 256 230 205 184 170 153 146
Recovery capacities at 100° F rise equal: for non-simultaneous element operation = 4.1 gal. x kW of one element; for simultaneous
element operation = 4.1 gal. x 2/3 KW of both elements. For other rises multiply element KW as previously explained by 410 and
divide by temperature rise. Full load current for single phase = total watts : voltage.
MODEL AND RATING
LISTED
932N
LLC
ELECTRIC STORAGE
TANK WATER HEATER
MODEL NUMBER SERIAL NUMBER ITEM ID/PART NUMBER
VOLTS - AC
PHASE
WATTS
UPPER
WATTS
LOWER
TOTAL WATTS
CONNECTED
CAPACITY
US GAL.
MAX WORKING
PRESSURE
VOLTS - AC
WATTS
UPPER
WATTS
LOWER
TOTAL WATTS
CONNECTED
CIRCUIT
ALTERNATE RATINGS
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INSTALLATION CONSIDERATIONSINSTALLATION CONSIDERATIONS
INLET
3/4” (FEMALE)
NPT
OUTLET
3/4” (FEMALE)
NPT
2 1/2”
(63.5 mm)
JUNCTION
BOX
D
FRONT VIEW
DEL 30/40/50
DRAIN
VALVE
B
C A
FRONT VIEW
DEN 30-52
DRAIN
VALVE
B
A
2 1/2”
(63.5 mm)
INLET
3/4” (FEMALE)
NPT
OUTLET
3/4” (FEMALE)
NPT
JUNCTION
BOX
D
TOP VIEW
DEL 30/40/50
TOP VIEW
DEL 6/10/15/20
TOP VIEW
DEN 30 - 52
INLET
3/4” (FEMALE)
NPT
OUTLET
3/4” (FEMALE)
NPT
FRONT VIEW
DEL 6/10/15/20
*(NO SIDE OUTLET AVAILABLE FOR DEL-6 MODELS)
3/4” NPT
RELIEF VALVE
OPENING
ALTERNATE OUTLET
3/4” (FEMALE) NPT
ELECTRICAL
CONNECTION
C
A
B
3/4” NPT
RELIEF VALVE
OPENING
C
3/4” NPT
RELIEF VALVE
OPENING
ANODES ANODE
Figure 2. Rough-In Dimensions
Table 2. Rough-In Dimensions
Models Di-
mensions
No. of
Elements
Tank Capacity A B C D
Approx.
Shipping Weight
US Gals Liters Inches mm Inches mm Inches mm Inches mm Lbs. kg.
Compact-6 1 6 23 15.50 394 14.25 362 11.00 279 - - 35 15.9
Compact-10 1 10 38 18.25 464 18.00 457 12.50 318 - - 54 24.5
Compact-15 1 15 57 26.00 660 18.00 457 20.50 521 - - 58 26.3
Compact-20 1 20 76 22.25 565 21.75 552 15.38 391 - - 73 33.1
Lowboy-30 2 36 136 32.00 813 24.00 610 24.00 610 8.00 203 118 53.5
Lowboy-40 2 38 144 32.00 813 23.00 584 24.00 610 8.00 203 118 53.5
Lowboy-50 2 51 193 36.00 914 26.50 673 25.00 635 8.00 203 172 78.0
Tall-30 2 40 151 49.75 1264 20.50 521 53.25 1353 8.00 203 118 53.5
Tall-40 2 50 189 59.00 1499 20.50 521 51.25 1302 8.00 203 125 56.7
Tall-52 2 55 208 56.50 1435 24.00 610 48.50 1232 8.00 203 145 65.8
LOCATING THE WATER HEATER
Property Damage Hazard
•
All water heaters eventually leak.
• Do not install without adequate drainage.
CAUTION
The water heater should be located as close as possible to/or
centralized to the water piping system. The water heater should be
located in an area not subject to freezing temperatures.
The water heater should be located in an area where leakage of the
tank or connections will not result in damage to the area adjacent to
the heater or to lower oors of the structure.
When such locations cannot be avoided, a suitable drain pan should
be installed under the heater.
Such pans should be at least two inches deep, have a minimum
length and width of at least two inches greater than the diameter of
the heater and should be piped to an adequate drain.
Drain pans suitable for these water heaters are available from
your distributor or A.O. Smith Water Heater Parts Fulllment, 125
Southeast Parkway, Franklin, TN 37068.
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11
Water heater life depends upon water quality, water pressure and
the environment in which the water heater is installed. Water heaters
are sometimes installed in locations where leakage may result in
property damage, even with the use of a drain pan piped to a drain.
However, unanticipated damage can be reduced or prevented by
a leak detector or water shut-o device used in conjunction with a
piped drain pan. These devices are available from some plumbing
supply wholesalers and retailers, and detect and react to leakage
in various ways:
• Sensors mounted in the drain pan that trigger an alarm or turn
o the incoming water to the water heater when leakage is
detected.
• Sensors mounted in the drain pan that turn o the water
supply to the entire home when water is detected in the drain
pan.
• Water supply shut-o devices that activate based on the water
pressure dierential between the cold water and how water
pipes connected to the water heater.
• Devices that will turn o the gas supply to a gas water heater
while at the same time shutting o its water supply.
CLEARANCES
A minimum clearance of 4” must be allowed for access to replaceable
parts such as thermostats, drain valve and relief valve.
Adequate clearance for servicing this water heater should be
considered before installation, such as changing the anodes, etc.
If the water heater becomes immersed
in water up to or above the level of the
bottom of the element doors, the
heater should be examined by a
qualified service agency before it is
placed in operation.
Electrical Shock Hazard
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INSTALLATIONINSTALLATION
REQUIRED ABILITY
Installation and service of this water heater requires ability equivalent
to that of a qualied installer or service agency in the eld involved.
See
Important Definitions
(page 3). Plumbing and electrical work
is required.
GENERAL
The installation must conform with these instructions and the local
code authority having jurisdiction and the requirements of the power
company. In the absence of local codes, the installation must comply
with the latest editions of the
National Electrical Code, NFPA 70
or the
Canadian Electrical Code CSA C22.1
. The
National Electrical Code
may be
ordered from: National Fire Protection Association, 1 Batterymarch
Park, Quincy, MA 02269. The
Canadian Electrical Code
is available from
the Canadian Standards Association, 8501 East Pleasant Valley
Road, Cleveland, OH 44131.
Do NOT
test electrical system before heater is lled with water, follow
the
START UP
procedure in the
OPERATION
section of this manual.
The principal components of the heater are identied in the
Features
and Components
(page 8).
Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or shower-
ing.
Temperature limiting devices such as
thermostatic point-of-use mixing
valves must be installed when
required by codes and to ensure safe
temperatures at fixtures.
MIXING VALVE USAGE
Water heaters are intended to produce hot water. Water heated to
a temperature which will satisfy space heating, clothes washing,
dish washing, cleaning and other sanitizing needs can scald and
permanently injure you upon contact. Some people are more likely
to be permanently injured by hot water than others. These include
the elderly, children, the infirm, or physically/developmentally
disabled. If anyone using hot water in your home ts into one of these
groups or if there is a local code or state law requiring a maximum
water temperature at the hot water tap, then you must take special
precautions. In addition to using the lowest possible temperature
setting that satises your hot water needs, a means such as a
MIXING VALVE, should be used at the hot water taps used by these
people or at the water heater.
MIXING VALVES
for reducing point of use temperature are available
and are to be set at a maximum of 125 degree F. Consult a qualied
installer or service agency. Follow all manufacturer’s Instructions for
installation of these valves. Before changing the factory setting on the
thermostat, read the “Temperature Regulation” section in this manual.
Toxic Chemical Hazard
WARNING
● Do not connect to non-potable water system.
CONTAMINATED WATER
This water heater shall not be connected to any heating system(s)
or component(s) used with a non-potable water heating appliance.
Toxic chemicals, such as those used for boiler treatment shall not
be introduced into this system.
CIRCULATING PUMP
Field installed circulating pumps should be of all bronze construction.
INSULATION BLANKETS
Insulation blankets are available to the general public for external
use on electric water heaters but are not necessary with this product.
The purpose of an insulation blanket is to reduce the standby heat
loss encountered with storage tank heaters.
Should you choose to apply an insulation blanket to this heater,
you should follow these instructions below. Failure to follow these
instructions can result in re, serious personal injury, or death.
• Do not cover the temperature and pressure relief (T & P) valve
with an insulation blanket.
• Do not cover the instruction manual. Keep it on the side of the
water heater or nearby for future reference.
• Do obtain new warning and instruction labels for placement on
the blanket directly over the existing labels.
TEMPERATURE-PRESSURE RELIEF VALVE
Explosion Hazard
Temperature-Pressure Relief Valve
must comply with ANSI Z21.22-
CSA 4.4 and ASME code.
Properly sized temperature-
pressure relief valve must be
installed in opening provided.
Can result in overheating and
excessive tank pressure.
Can cause serious injury or death.
This water heater is provided with a properly rated/sized and certied
combination temperature - pressure relief valve by the manufacturer.
The valve is certied by a nationally recognized testing laboratory
that maintains periodic inspection of production of listed equipment
of materials as meeting the requirements for
Relief Valves for Hot Water
Supply Systems, ANSI Z21.22 • CSA 4.4
, and the code requirements of
ASME
.
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13
If replaced, the new valve must meet the requirements of local codes,
but not less than a combination temperature and pressure relief
valve rated/sized and certied as indicated in the above paragraph.
The new valve must be marked with a maximum set pressure not to
exceed the marked hydrostatic working pressure of the water heater
(150 psi = 1,035 kPa) and a discharge capacity not less than the
water heater Btu/hr or KW input rate as shown on the water heater’s
model rating plate.
For safe operation of the water heater, the temperature and pressure
relief valve must not be removed from its designated opening nor
plugged. The temperature-pressure relief valve must be installed
directly into the tting of the water heater designed for the relief valve.
Install discharge piping so that any discharge will exit only within 6
inches (15.2 cm) above, or at any distance below the structural oor.
Be certain that no contact is made with any live electrical part. The
discharge opening must not be blocked or reduced in size under
any circumstances. Excessive length, over 30 feet (9.14 m), or
use of more than four elbows can cause restriction and reduce the
discharge capacity of the valve.
No valve or other obstruction is to be placed between the relief valve
and the tank. Do not connect discharge piping directly to the drain
unless a 6” (15.2 cm) air gap is provided. To prevent bodily injury,
hazard to life, or property damage, the relief valve must be allowed
to discharge water in adequate quantities should circumstances
demand. If the discharge pipe is not connected to a drain or other
suitable means, the water ow may cause property damage.
Property Damage Hazard
● The temperature-pressure relief-valve discharge pipe
must terminate at an adequate drain.
The Discharge Pipe:
• Shall not be smaller in size than the outlet pipe size of the
valve, or have any reducing couplings or other restrictions.
• Shall not be plugged or blocked.
• Shall be of material listed for hot water distribution.
• Shall be installed so as to allow complete drainage of both the
temperature-pressure relief valve and the discharge pipe.
• Must terminate a maximum of six inches above a oor drain
or external to the building. In cold climates, it is recommended
that the discharge pipe be terminated at an adequate drain
inside the building.
• Shall not have any valve or other obstruction between the
relief valve and the drain.
Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or shower-
ing.
Temperature limiting devices such as
thermostatic point-of-use mixing
valves must be installed when
required by codes and to ensure safe
temperatures at fixtures.
The temperature-pressure relief valve must be manually operated
at least once a year. Caution should be taken to ensure that (1) no
one is in front of or around the outlet of the temperature-pressure
relief valve discharge line, and (2) the water manually discharged
can cause bodily injury or property damage because the water may
be extremely hot. If after manually operating the valve, it fails to
completely reset and continues to release water, immediately close
the cold water inlet to the water heater, follow the draining instructions
in this manual, and replace the temperature-pressure relief valve
with a properly rated/sized new one.
If you do not understand these instructions or have any questions
regarding the temperature-pressure relief valve call the toll free
number listed on the back cover (page 24) of this manual for
technical assistance.
CLOSED WATER SYSTEMS
Water supply systems may, because of code requirements or such
conditions as high line pressure, among others, have installed
devices such as pressure reducing valves, check valves, and back
ow preventers. Devices such as these cause the water system to
be a closed system.
THERMAL EXPANSION
As water is heated, it expands (thermal expansion). In a closed
system the volume of water will grow when it is heated. As the
volume of water grows there will be a corresponding increase in
water pressure due to thermal expansion. Thermal expansion can
cause premature tank failure (leakage). This type of failure is not
covered under the limited warranty. Thermal expansion can also
cause intermittent temperature-pressure relief valve operation:
water discharged from the valve due to excessive pressure build
up. This condition is not covered under the limited warranty. The
temperature-pressure relief valve is not intended for the constant
relief of thermal expansion.
A properly sized thermal expansion tank should be installed on all
closed systems to control the harmful eects of thermal expansion.
Contact a local plumbing service agency to have a thermal expansion
tank installed.
ELECTRICAL
● Before removing any access panels or
servicing the water heater, make sure
the the electrical supply to the water
heater is turned OFF.
Electrical Shock Hazard
● Failure to follow these instructions can
result in personal injury or death.
GENERAL
The installation must conform with these instructions and the local
code authority having jurisdiction and the requirements of the power
company. In the absence of local codes, the installation must comply
with the current editions of the
National Electrical Code, NFPA 70
or the
Canadian Electrical Code CSA C22.1
.
An electrical ground is required to reduce risk of electrical shock
or possible electrocution. The water heater should be connected
to a separate grounded branch circuit with over-current protection
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14
and disconnect switch. The water heater should be grounded in
accordance with national and local codes.
Voltage applied to the heater should not vary more than +5% to -10%
of the model and rating plate marking for satisfactory operation.
DO NOT ENERGIZE THE BRANCH CIRCUIT FOR ANY REASON
BEFORE THE HEATER TANK IS FILLED WITH WATER. DOING SO
WILL CAUSE THE HEATING ELEMENTS TO BURN OUT AND VOID
WARRANTY.
The factory wiring is attached to a terminal block within the external
junction box unit. The branch circuit is connected to the terminal
block within this junction box. The water heater should be connected
to a separate, grounded, branch circuit with over-current protection
and disconnect switch. The water heater should be grounded in
accordance with national and local codes.
BRANCH CIRCUIT
The branch circuit wire size should be established through reference
to the current edition of NFPA-70, the National Electrical Code
or other locally approved source in conjunction with the heater
amperage rating. For convenience, portions of the wire size tables
from the Code are reproduced here. The branch circuit should be
sized at 125 percent of the heater rating and further increase wire
size as necessary to compensate for voltage drop in long runs.
CALCULATING AMPERAGE/OVER-CURRENT PROTECTION
The heaters come from the factory in two congurations:
1. Two wire C-2 circuit for single element heater equipped with a
high limit control, single phase power input.
2. Four wire A-8 circuit for dual element heater equipped with two
high limit controls, single phase or three phase power input.
The heater with dual elements is factory wired for connection to
a three wire, three-phase delta branch circuit, non-simultaneous
operation. In addition a ground conductor is required.
Element connection is for non-simultaneous operation. This means
only one element at a time operates. The wiring diagram shows the
heater may be eld converted to simultaneous element operation by
moving the red wire on “J” terminal to L1. See
Wiring Diagram
(page
23).
It is then possible for both elements to operate at once as
determined by the thermostats. Regardless of element connection
the heater operates in an “unbalanced” fashion.
The heater may be eld converted to single-phase operation by
moving the wire on L3 of the terminal block to L2. L3 is not used.
See
Wiring Diagram
(page 23).
The heater, now in single-phase non-simultaneous operation, may
be eld-converted to single phase simultaneous operation by moving
the red wire on terminal “J” to L1. See
Wiring Diagram
(page 23).
This is an example of calculating heater amperage for both types
of element operation. From this, the branch circuit conductor and
over-current protection sizing can be established.
The example is of a three-phase 240 volt unit with two, 6 kw elements.
The notations are for units eld converted to single-phase. Check the
heater model and rating plate for actual specications and substitute
those values in the following.
Table 3. Example Calculation
Non-simultaneous:
(Factory wired)
Simultaneous:
(Field conversion)
3000 : 240 = 12.5 amps*
3000 : 240 = 12.5 amps*
12.5 x 1.73 = 21.6 amps
*NOTE: as a single-phase non-
simultaneous unit.
*NOTE: as a single-phase simultane-
ous unit the total is: 12.5 x 2 = 25
amps
The rating of the over-current protection should be computed on
the basis of 125 percent of the total connected load amperage.
Where the standard ratings and settings do not correspond with
this computation, the next higher standard rating or setting should
be selected.
PORTION OF TABLE 310-16 (NFPA-70) FOLLOWS:
Allowable Ampacities of Insulated Copper Conductors. Not more
than three conductors in Raceway or Cable or Direct Burial (Based
on Ambient Temperature of 30° C, 86° F).
These ampacities relate only to conductors described in
Table 310-13
in Code
.
For ambient temperatures over 30° C (86° F), see
Correction Factors,
Note 13 in Code
.
Portion of Table 310-16 (NFPA-70)
Size
Temperature Rating of Conductor
See Table 310-13 in Code
AMG
MCM
60°C
(140°F)
75°C
(167°F)
Types:
RUW, (14-2), T, TW, UF
Types:
RH, RHW, RUH, (14-2),
THW, THWN, XHHW, USE
18
16
14
- - -
- - -
15
- - -
- - -
15
12
10
8
20
30
40
20
30
45
6
4
3
55
70
80
65
85
100
PORTION OF TABLE 310-18 FOLLOWS:
Allowable Ampacities of Insulated Aluminum and Copper -Clad
Aluminum Conductors.
Not more than three conductors in Raceway or Cable or Direct Burial
(Based on Ambient Temperature of 30° C, 86° F. These ampacities
relate only to conductors described in
Table 310-13
in
Code
.
For ambient temperatures over 30° C (86° F), see C
orrection Factors,
Note 13
in
Code
.
Portion of Table 310-18 (NFPA-70)
Size
Temperature Rating of Conductor
See Table 310-13 in Code
AMG
MCM
60°C
(140°F)
75°C
(167°F)
Types:
RUW, (14-2), T, TW, UF
Types:
RH, RHW, RUH, (14-2),
THW, THWN, XHHW, USE
12
10
15
25
15
25
8
6
30
40
40
50
4
3
55
65
65
75
2
1
75
85
90
100
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15
START UPSTART UP
See
Features and Components
(page 8) for the location of
components mentioned in the instructions that follow.
NEVER turn on power to the water heater without being certain the
water heater is lled with water and a temperature and pressure
relief valve is installed in the relief valve opening.
DO NOT TEST ELECTRICAL SYSTEM BEFORE HEATER IS FILLED
WITH WATER. FOLLOW FILLING AND START-UP INSTRUCTIONS
IN OPERATION SECTION.
Full power is present whenever the
cabinet door is opened, even with
the pilot switch turned off.
Electrical Shock Hazard
LIMITING THE RISK OF SCALDING
For a variety of reasons, water heaters can produce water that is
much hotter than its temperature setting. Take precautions to prevent
this higher temperature water from reaching the water xtures.
Burn Hazard
To reduce the risk of unusually hot
water reaching the fixtures in the
house, install thermostatic mixing
valves at each point of use.
A properly adjusted thermostatic mixing valve at each point of use
allows you to set the tank temperature to a higher setting without
increasing risk of scalds. A higher temperature setting allows the
tank to provide much more hot water and can help provide proper
water temperatures for appliances such as dishwashers and washing
machines.
Burn Hazard
If you choose a higher temperature
setting, install thermostatic mixing
valves at each point-of-use to help
avoid scalding.
FILLING THE WATER HEATER
Property Damage Hazard
To avoid water heater damage, fill tank with water
before operating.
CAUTION
1. Turn o the electrical disconnect switch.
2. Close the water heater drain valve.
3. Open a nearby hot water faucet to permit the air in the system
to escape.
4. Fully open the cold water inlet pipe valve allowing the heater and
piping to be lled.
5. Close the hot water faucet as water starts to ow. The heater is
now ready for STARTUP and TEMPERATURE REGULATION.
INITIAL START UP
The following checks should be made by the installer when the heater
is placed into operation for the rst time.
1. Turn o the electrical disconnect switch.
2. Open the front panel or top access cover, check all water and
electrical connections for tightness. Also check connections on top
and or sides of heater. Repair water leaks and tighten electrical
connections as necessary.
3. Depress the red manual reset button on each Thermostat/ECO
combination control. See
Temperature Regulation
(page 16)
4. Turn on the electrical disconnect switch.
5. Observe the operation of the electrical components during the rst
heating cycle. Use care as the electrical circuits are energized.
6. Close the front panel or top access cover.
Temperature control and contactor operation should be checked by
allowing heater to come up to temperature and shut o automatically.
Use care as the electrical circuits are energized.
DRAINING THE WATER HEATER
The water heater must be drained if it is to be shut down and exposed
to freezing temperatures. Maintenance and service procedures may
also require draining the heater.
1. Turn o the electrical disconnect switch.
2. Open a hot water valve until the water is cool, then close the
supply water inlet valve to heater.
3. Attach hose to outlet opening of drain valve and direct end to
drain.
4. Open a nearby hot water faucet and the heater drain valve.
5. If the heater is being drained for an extended shutdown, it is
suggested the drain valve be left open during this period. The
hose may be removed.
Follow the instructions in
Filling the Water Heater
(page 15) when
restoring hot water service.
• Burn hazard.
• Hot water discharge.
• Keep hands clear of drain
valve discharge.
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16
TEMPERATURE REGULATIONTEMPERATURE REGULATION
Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or shower-
ing.
Temperature limiting devices such as
thermostatic point-of-use mixing
valves must be installed when
required by codes and to ensure safe
temperatures at fixtures.
THE WATER HEATER IS EQUIPPED WITH AN ADJUSTABLE
THERMOSTAT TO CONTROL WATER TEMPERATURE. HOT WATER
AT TEMPERATURES DESIRED FOR AUTOMATIC DISHWASHER
AND LAUNDRY USE CAN CAUSE SCALDS RESULTING IN SERIOUS
PERSONAL INJURY AND/OR DEATH. THE TEMPERATURE AT
WHICH INJURY OCCURS VARIES WITH THE PERSON’S AGE AND
TIME OF EXPOSURE. THE SLOWER RESPONSE TIME OF CHILDREN
, AGED OR DISABLED PERSONS INCREASES THE HAZARD TO
THEM. NEVER ALLOW SMALL CHILDREN TO USE A HOT WATER
TAP, OR TO DRAW THEIR OWN BATH WATER. NEVER LEAVE A
CHILD OR DISABLED PERSON UNATTENDED IN A BATHTUB OR
SHOWER.
It is recommended that lower water temperatures be used to avoid
the risk of scalding. It is further recommended, in all cases, that
the water temperature thermostats (See Temperature Adjustment)
be set for the lowest temperature which satises your hot water
needs. This will also provide the most energy ecient operation of
the water heater.
Burn Hazard
If you choose a higher temperature
setting, install thermostatic mixing
valves at each point-of-use to help
avoid scalding.
Temperature Adjustment shows the approximate time-to-burn
relationship for normal adult skin. The thermostats on your water
heater have a linear relationship between degrees of angular rotation
and the corresponding change in temperature. Thus rotating the
temperature adjustment indicator 30 angular degrees will result in
a 10 degree Fahrenheit change in water temperature.
Table 4. Burn Time at Various Temperatures
Water Temperature
°F (°C)
Time for 1st Degree
Burn
(Less Severe Burns)
Time for Permanent
Burns
2nd & 3rd Degree
(Most Severe Burns)
110 (43) (normal shower temp.)
116 (47) (pain threshold)
116 (47) 35 minutes 45 minutes
122 (50) 1 minute 5 minutes
131 (55) 5 seconds 25 seconds
140 (60) 2 seconds 5 seconds
149 (65) 1 second 2 seconds
154 (68) instantaneous 1 second
(U.S. Government Memorandum, C.P.S.C., Peter L. Armstrong, Sept. 15, 1978)
Burn Hazard
To reduce the risk of unusually hot
water reaching the fixtures in the
house, install thermostatic mixing
valves at each point of use.
TEMPERATURE ADJUSTMENT
A-8 circuit thermostats are adjustable from approximately 120°F
(49°C) (lowest setting) to 181°F (83°C) (highest setting). The C-2
circuit thermostat is adjustable from approximately 110°F (43°C)
to 170°F (77°C). These thermostats are set from the factory at
approximately the 140°F (60°C) setting. The over temperature device
(ECO high limit) attached to each thermostat has a manual reset.
L1 L3
L4
T2 T4
L2
T1
THERM O DISC
89T
RESET
RESET
181°F
83°C
60°C
49°C
120°F
140°F
L1 L3
L4
T2 T4
L2
T1
THERM-O-DISC
RESET
170°F
140°F
110°F
RESET
Figure 3. A-8 Thermostat Figure 4. C-2 Thermostat
Note: It is not necessary to adjust the upper thermostat for a dual
element unit. However, if it is adjusted above the factory set
point 140°F (60°C) it is recommended that it not be set higher
than the lower thermostat setting.
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17
To change the temperature setting:
● Before removing any access panels or
servicing the water heater, make sure
the the electrical supply to the water
heater is turned OFF.
Electrical Shock Hazard
● Failure to follow these instructions can
result in personal injury or death.
1. DANGER: Turn o the heater electrical supply. Do not attempt
to adjust thermostat with power on.
2. Open the junction box door (for upper thermostat of dual element
water heater only) and/or remove the (lower) thermostat access
panel. Do not remove the plastic personnel protectors covering
the thermostats. The thermostat is factory pre-set at 140°F (60°C).
3. Using a at tip screwdriver, rotate the adjusting knob to the desired
temperature setting.
4. Replace the covers and access panels, and turn on heater
electrical supply.
Burn Hazard
If you choose a higher temperature
setting, install thermostatic mixing
valves at each point-of-use to help
avoid scalding.
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18
MAINTENANCEMAINTENANCE
Table 5. Maintenance Schedule
Component Operation Interval Reference
Tank Drain and Flush
Every 6
Months
See
Draining and Flushing
Tank
Lime Scale Re-
moval
(Water Less Than
25 Grains Hard)
Not Required N/A
Tank
Lime Scale Re-
moval
(Water Greater
Than 25 Grains
Hard)
Annually
See
Lime Scale Removal
.
Moving Parts Lubrication Not Required N/A
Powered
Anodes
Inspection/
Cleaning
Annually
See
Anode Maintenance
(page
19)
T&P Valve Test Operation Semi Annually
See
Temperature-Pressure Relief
Valve Test
. (page 19).
Burn hazard.
Hot water discharge.
Keep clear of Temperature-
Pressure Relief Valve
discharge outlet.
Periodically the drain valve should be opened and the water allowed
to run until it ows clean. This will help to prevent sediment buildup
in the tank bottom.
Periodically check the temperature and pressure relief valve to
ensure that it is in operating condition. Lift the lever at the top of the
valve several times until the valve seats properly and operates freely.
Water heater maintenance includes periodic tank ushing and
cleaning, and removal of lime scale from the heating element.
The heater tank is equipped with an anode rod to aid in corrosion
control.
DRAINING AND FLUSHING
It is recommended that the water heater storage tank be drained
and flushed every 6 months to reduce sediment buildup. The
water heater should be drained if being shut down during freezing
temperatures. See
Figure 1
(page 8) for the location of the water
heater components described below.
• Burn hazard.
• Hot water discharge.
• Keep hands clear of drain
valve discharge.
DRAINING THE WATER HEATER STORAGE TANK
1. Turn o the electrical supply to the water heater.
2. Ensure the cold water inlet valve is open.
3. Open a nearby hot water faucet and let the water run until the
water is no longer hot.
4. Close the cold water inlet valve to the water heater.
5. Connect a hose to the water heater drain valve and terminate it
to an adequate drain.
6. Open the water heater drain valve and allow all the water to drain
from the storage tank.
7. Close the water heater drain valve when all water in the storage
tank has drained.
8. Close the hot water faucet opened in Step 3.
9. If the water heater is going to be shut down for an extended
period, the drain valve should be left open.
FLUSHING THE WATER HEATER STORAGE TANK
1. Turn o the electrical supply to the water heater.
2. Ensure the cold water inlet valve is open.
3. Open a nearby hot water faucet and let the water run until the
water is no longer hot. Then close the hot water faucet.
4. Connect a hose to the drain valve and terminate it to an adequate
drain.
5. Ensure the drain hose is secured before and during the entire
ushing procedure. Flushing is performed with system water
pressure applied to the water heater.
6. Open the water heater drain valve to ush the storage tank.
7. Flush the water heater storage tank to remove sediment and
allow the water to ow until it runs clean.
8. Close the water heater drain valve when ushing is completed.
9. Remove the drain hose.
10. Fill the water heater. See
Filling the Water Heater
(page 15).
11. Turn on the electrical supply to place the water heater back in
operation.
12. Allow the water heater to complete several heating cycles to
ensure it is operating properly.
LIME SCALE REMOVAL
When water is heated, dissolved minerals in the water such as
calcium and magnesium carbonate (lime scale) become less soluble.
As the water temperature rises these minerals will precipitate or “fall
out” of solution.
The amount of lime scale released from water is in direct proportion
to water temperature and usage. The higher the water temperature
or water usage, the more lime deposits are dropped out of the water.
Water hardness also aects lime scale accumulation. With the
temperature and usage being the same, hard water will release
more lime scale than softer water.
Lime scale reduces heating eciency as it accumulates inside a
water heater. Heating transfer surfaces become coated with lime
scale deposits which increases fuel costs to operate the water heater.
Lime scale deposits can also cause rumbling and pounding noises
as air molecules trapped in the lime scale escape when heated. Lime
scale accumulation also reduces the life span of water heaters. For
these reasons a regular schedule for deliming should be set up.
CHEMICAL LIME SCALE REMOVAL
To dissolve and remove more stubborn lime scale deposits, UN-
LIME
®
Professional Delimer should be used.
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19
UN-LIME
®
Professional Delimer is an easy to handle patented food
grade acid formulated specically for lime scale removal from all
types of water using equipment. Hydrochloric base acids must not
be used to delime the water heaters covered in this manual.
Follow the instructions on the UN-LIME
®
to delime the water heater.
Note: Contact Technical Support for assistance in ordering the UN-
LIME
®
Professional Delimer.
ANODE MAINTENANCE
Avoid damage.
Property Damage Hazard
Inspection and replacement of anode rod required.
The anode rod is used to protect the tank from corrosion. Most hot
water tanks are equipped with an anode rod. The submerged rod
sacrices itself to protect the tank. Instead of corroding tank, water
ions attack and eat away the anode rod. This does not aect water’s
taste or color. The rod must be maintained to keep tank in operating
condition.
Anode deterioration depends on water conductivity, not necessarily
water condition. A corroded or pitted anode rod indicates high water
conductivity and should be checked and/or replaced more often than
an anode rod that appears to be intact. Replacement of a depleted
anode rod can extend the life of your water heater. Inspection should
be conducted by a qualied technician, and at a minimum should
be checked annually.
Articially softened water is exceedingly corrosive because the
process substitutes sodium ions for magnesium and calcium ions.
The use of a water softener may decrease the life of the water
heater tank.
The anode rod should be inspected annually.
The following are typical (but not all) signs of a depleted anode rod:
• The majority of the rods diameter is less than 3/8”.
• Signicant sections of the support wire (approx. 1/3 or more of
the anode rod’s length) are visible.
Figure 5. Anode Depletion
If the anode rod show signs of either or both it should be replaced.
Note: Whether re-installing or replacing the anode rod, check for
any leaks and immediately correct if found.
Dot the following to replace the anode:
1. Turn o the power supply to the water heater.
2. Shut o the water supply and open a nearby hot water faucet to
depressurize the water tank.
3. Drain approximately 5 gallons of water from tank. See
Draining and
Flushing
(page 18) for proper procedures. Close drain valve.
4. Remove old anode rod.
5. Use Teon
®
tape or approved pipe sealant on threads and install
new anode rod.
6. Turn on water supply and open a nearby hot water faucet to purge
air from water system. Check for any leaks and immediately
correct any if found.
7. Restart the water heater as directed in this manual. See
Figure 1
(page 8) for anode rod location.
TEMPERATURE-PRESSURE RELIEF VALVE TEST
It is recommended that the Temperature-Pressure Relief Valve
should be checked to ensure that it is in operating condition every
6 months.
When checking the Temperature-Pressure Relief Valve operation,
make sure that (1) no one is in front of or around the outlet of the
Temperature-Pressure Relief Valve discharge line, and (2) that the
water discharge will not cause any property damage, as water may
be extremely hot. Use care when operating valve as the valve may
be hot.
To check the temperature-pressure relief valve, lift the lever at the
end of the valve several times. See
Figure 6
. The valve should seat
properly and operate freely.
If after manually operating the valve, it fails to completely reset and
continues to release water, immediately close the cold water inlet to
the water heater and drain the water heater. See
Draining and Flushing
(page 18). Replace the Temperature-Pressure Relief Valve with
a properly rated/sized new one. See
Temperature-Pressure Relief Valve
(page 12) for instructions on replacement.
Figure 6. Testing the Temperature-Pressure Relief Valve
If the Temperature-Pressure Relief Valve on the water heater weeps
or discharges periodically, this may be due to thermal expansion.
Note: Excessive water pressure is the most common cause of
Temperature-Pressure Relief Valve leakage. Excessive water
system pressure is most often caused by “thermal expansion”
in a “closed system.” See
Closed Water Systems
(page 13)
and
Thermal Expansion
(page 13). The Temperature-Pressure
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20
Relief Valve is not intended for the constant relief of thermal
expansion.
Temperature-Pressure Relief Valve leakage due to pressure build
up in a closed system that does not have a thermal expansion
tank installed is not covered under the limited warranty. Thermal
expansion tanks must be installed on all closed water systems.
DO NOT PLUG THE TEMPERATURE-PRESSURE RELIEF
VALVE OPENING. THIS CAN CAUSE PROPERTY DAMAGE,
SERIOUS INJURY OR DEATH.
Explosion Hazard
• Temperature-Pressure Relief
Valve must comply with ANSI
Z21.22-CSA 4.4 and ASME code.
• Properly sized tempera-
ture-pressure relief valve must
be installed in opening
provided.
• Can result in overheating and
excessive tank pressure.
• Can cause serious injury or
death.
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21
TROUBLESHOOTINGTROUBLESHOOTING
CHECKLIST
Before calling for service, check the following points to see if the
cause of trouble can be identied and corrected.
Reviewing this checklist may eliminate the need of a service call and
quickly restore hot water service. See
Figure 1
(page 8)
to identify
and locate water heater components.
● Before removing any access panels or
servicing the water heater, make sure
the the electrical supply to the water
heater is turned OFF.
Electrical Shock Hazard
● Failure to follow these instructions can
result in personal injury or death.
NOT ENOUGH OR NO HOT WATER
1. Be certain the electrical disconnect switch serving the water
heater is in the ON position.
2. Check the fuses.
• The electrical disconnect switch usually contains fuses.
3. If the water was excessively hot, and is now cold, the high limit
switch may have activated.
• See
Temperature Regulation
(page 16) for more informa-
tion on how to reset the ECO high limit controls.
4. The capacity of the heater may have been exceeded by a large
demand for hot water.
• Large demands require a recovery period to restore wa-
ter temperature.
5. Cooler incoming water temperature will lengthen the time required
to heat water to the desired temperature.
6. Look for hot water leakage.
7. Sediment or pipe scale may be aecting water heater operation.
ABNORMAL SOUNDS
8. Sediment or lime scale accumulations on the elements causes
sizzling and hissing noises when the heater is operating.
• The sounds are normal, however, the tank bottom and
elements should be cleaned. See the Maintenance section
of this manual.
WATER LEAKAGE IS SUSPECTED
See
Checking for Leaks
(page 22).
1. Check to see if the heater drain valve is tightly closed.
2. If the outlet of the relief valve is leaking it may represent:
• Excessive water temperature.
• Faulty relief valve.
• Excessive water pressure.
3. Excessive water pressure is the most common cause of relief
valve leakage. It is often caused by a “closed system”. See
“Closed Water Systems” and “Thermal Expansion” in the
Installation section of this manual for more information.
4. Examine the area around the element for gasket leakage.
• Tighten the elements or, if necessary, follow the instruc-
tions in
Lime Scale Removal
(page 18) to replace the gas-
kets.
IF YOU CANNOT IDENTIFY OR CORRECT THE SOURCE OF
MALFUNCTION
1. Turn the power supply to the water heater o.
2. Close the supply water inlet valve to the heater.
3. Contact a Qualied Service Agency in your area. Call the toll free
phone number on the back cover (page 24) of this Instruction
Manual for assistance in locating a service agency in your area.
REPLACEMENT PARTS
Call the toll free phone number on the back cover (page 24) of
this Instruction Manual for assistance in locating replacement parts..
When ordering parts, specify complete model no., serial no., (see
rating plate), quantity and name of part desired. Standard hardware
items should be purchased locally.
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22
CHECKING FOR LEAKS
Use this illustration as a guide when checking for sources of water leakage. You or your dealer may be able to correct what appears to
be a problem.
Note: Cover and insulation are show removed to reveal tank top.
All water which appears at the water heater bottom or on the surrounding oor may be caused by condensation, loose connections or
relief valve operation and leakage. Do not replace the water heater until full inspection of all potential leak points is made and corrective
steps taken to stop the leak.
Leakage from other appliances, water lines or ground should also be suspected until proven otherwise. See
Water Leakage Is Suspected
(page 21).
6
10
1
4
2
5
7
6
7
8
8
9
3
L1 L3
L4
T2 T4
L2
T1
THERM O DISC
89T
RESET
RESET
181°F
120°F
140°F
L1 L3
L4
T2 T4
L2
T1
THERM O DISC
89T
RESET
RESET
181°F
120°F
140°F
Figure 7. Leakage Checkpoints
Read and understand this instruction
manual and the safety messages
herein before installing, operating or
servicing this water heater.
Failure to follow these instructions and
safety messages could result in death
or serious injury.
This manual must remain with the
water heater.
Never use this water heater unless it is completely lled with water.
To prevent damage to the tank, the tank must be lled with water.
Water must ow from the hot water faucet before turning the water
heater.
1. Where possible remove or lift top cover to examine threads of
ttings installed into tank for evidence of leakage. Correct tting
leaks as necessary.
2. *Condensation may be seen on pipes in humid weather or pipe
connections may be leaking.
3. *The anode rod tting may be leaking.
4. *The temperature-pressure relief valve may be leaking at the
tank tting.
5. Small amounts of water from temperature-pressure relief valve
may be due to thermal expansion or high water pressure in your
area.
6. Water on the side of the tank may be condensation due to the
panel or insulation not being in place.
7. Defective element which leaks at terminals or thru ange. Replace
element*
8. Loose element/gasket leak
a. Screw-in type: tighten with 1-1/2” socket wrench. If leak
continues, remove element*, discard gasket and clean thread
areas. Apply non-hardening Permatex Number 2 to thread
areas, install new gasket and screw element into tting until
it seats. Tighten 1/2 to 3/4 turn with wrench.
b. Flange type: tighten screw with wrench. If leak continues
remove element* and discard gasket. Clean gasket seating
areas and re-install element with new gasket. A new element
may be required where threads have become rusted or
damaged, preventing tightening.
9. Water from a drain valve may be due to the valve being slightly
opened.
10. *The drain valve may be leaking at the tank tting.
Leakage from other water heaters, water lines, or ground seepage
should also be checked.
* To check where threaded portion enters tank, insert cotton swab
between jacket opening and tting. If cotton is wet, follow “Draining”
instructions in the “Periodic Maintenance” section and then remove
tting. Put pipe dope or teon tape on the threads and replace. Then
follow “Filling the Water Heater” instructions in the “Installing the New
Water Heater” section.
*Contact your dealer as it is necessary to shut o electricity and
drain tank to perform procedure.
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23
WIRING DIAGRAMWIRING DIAGRAM
A-8 CIRCUIT FOR DUAL ELEMENT HEATER
C-2 CIRCUIT
FOR SINGLE
ELEMENT HEATERS
EQUIPPED WITH HIGH
LIMIT CONTROL
FACTORY WIRED
---------- FIELD WIRING
† WHITE FOR 120V & 277V
Figure 8. A8 and C2 Circuit Wiring Diagrams
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24
www.hotwater.com
500 Tennessee Waltz Parkway, Ashland City, TN 37015
Tech Support: 800-527-1953
Parts: 800-433-2545
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Printed on 7/25/2022 7:17 AM CT
