PRINTED 0814 198334-004
Instruction Manual
place these InstructIons adjacent to heater and notIfy owner to keep for future reference.
coMMercIal electrIc water heaters
Thank you for buying this energy efficient water
heater. We appreciate your confidence in our
products.
Models dse-5 thru dse-120
InstallatIon - operatIon - serVIce -
MaIntenance - lIMIted warranty
A DIVISION OF A. O. SMITH CORPORATION
RENTON, WASHINGTON
www.hotwater.com
2
safe 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.
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.
danGer
danGer indicates an imminently hazardous
situation which, if not avoided, will result in
death or injury.
warnInG
warnInG indicates a potentially hazardous
situation which, if not avoided, could result in
death or injury.
cautIon
cautIon indicates a potentially hazardous
situation which, if not avoided, could result in
minor or moderate injury.
cautIon
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.
the california safe drinking water and toxic enforcement act requires the Governor of california to publish a list of
substances known to the state of california to cause cancer, birth defects, or other reproductive harm, and requires
businesses to warn of potential exposure to such substances.
this product contains a chemical known to the state of california to cause cancer, birth defects, or other reproductive
harm. this water heater can cause low level exposure to some of the substances listed in the act.
IMportant defInItIons
• QualiedInstallerorServiceAgency:
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 and electrical supply are required in addition to electrical testing skills when
performing service.
• ANSIZ223.12006Sec.3.3.83:
“Qualied Agency” - “Any individual, rm, 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.”
3
General safety InforMatIon
when servicing this unit, verify the power to the unit is turned off prior to opening the control cabinet door.
precautIons
DO NOT USE THIS WATER HEATER IF ANY PART HAS BEEN
EXPOSED TO FLOODING OR WATER DAMAGE. Immediately
call a qualified 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.
hydroGen Gas (flaMMable)
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.
Improper installation, use and service may
result in property damage.
CAUTION
•
Do not operate water heater if any part has been
exposed to flooding or water damage.
•
Inspect anode rods regularly, replace when significantly depleted.
•
Install in location with drainage.
•
Fill tank with water before operation.
•
Properly sized thermal expansion tanks are required on all
closed water systems.
Refer to this manual for installation and service.
4
table of contents
IntroductIon
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
• ASME - American Society of Mechanical Engineers
• AHRI - Air-Conditioning, Heating and Refrigeration Institute
• NEC - National Electrical Code
• NFPA - National Fire Protection Association
• UL - Underwriters Laboratory
preparInG for the InstallatIon
1. Read the “General Safety” 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.
Detailed installation diagrams are in this manual. These
diagrams will serve to provide the installer with a reference
for the materials and method of piping suggested. IT
IS NECESSARY THAT ALL WATER PIPING AND THE
ELECTRICAL WIRING BE INSTALLED AND CONNECTED
AS SHOWN IN THE DIAGRAMS.
Particular attention should be given to the installation of
thermometers at the locations indicated in the diagrams as
these are necessary for checking the operation of the heater.
Be sure to turn off 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
page 12 through 14.
The principal components of the heater are identied on page 6.
The model and rating plate on page 7 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 code requirements,
follow NFPA-70 (current edition). The National Electrical Code
may be ordered from: National Fire Protection Association, 1
Batterymarch Park, Quincy, MA 02269.
3. If after reading this manual you have any questions or do not
understand any portion of the instructions, call the toll free
number on the back cover for further assistance.
A sample rating plate and barcode tag are shown on page 3 of this
manual. In order to expedite your request, please have the serial
number and item ID from the barcode tag available for the technician.
4. Carefully plan your intended placement of the water heater.
Examine the location to ensure the water heater complies with
the “Locating the New Water Heater” section in this manual.
Installation and service of this water heater requires ability
equivalent to that of a licensed tradesman or qualied agency
(page 2) in the eld involved. Plumbing and electrical work are
required.
5. For installation in California this water heater must be braced or
anchored to avoid falling or moving during an earthquake. See
instructions for correct installation procedures. Instructions may
be obtained from California Ofce of the State Architect, 1102 Q
Street, Suite 5100, Sacramento, CA 95811.
6. Massachusetts Code requires this water heater to be installed
in accordance with Massachusetts 248-CMR 2.00: State
Plumbing Code and 248-CMR 5.00.
SAFE INSTALLATION, USE AND SERVICE...........................................................2
GENERAL SAFETY INFORMATION .......................................................................3
Precautions ....................................................................................................3
Hydrogen Gas (Flammable) ...........................................................................3
INTRODUCTION .....................................................................................................4
Preparing for the Installation ..........................................................................4
DIMENSIONS AND CAPACITIES DATA .................................................................5
FEATURES AND COMPONENTS ..........................................................................6
APPROVALS ...........................................................................................................7
LOCATING THE NEW WATER HEATER ................................................................7
Facts to Consider About the Location ............................................................7
INSTALLATION .......................................................................................................8
Required Ability ..............................................................................................8
General ..........................................................................................................8
Contaminated Water ......................................................................................8
Circulating Pump ............................................................................................8
Temperature-Pressure Relief Valve................................................................8
Water Line Connections .................................................................................9
Closed Water Systems ...................................................................................9
Thermal Expansion ........................................................................................9
ELECTRICAL DATA ...............................................................................................10
General ........................................................................................................10
Branch Circuit ...............................................................................................10
Heater Circuits .............................................................................................10
Control Circuits .............................................................................................10
Power Circuit ................................................................................................10
WIRING DIAGRAMS .............................................................................................12
OPERATION ..........................................................................................................15
General ........................................................................................................15
Filling the Water Heater ................................................................................15
Initial Start Up ...............................................................................................15
Draining the Water Heater ...........................................................................15
TEMPERATURE REGULATION ...........................................................................16
High Temperature Limit Controls (ECO) .......................................................16
Thermostat Controls .....................................................................................16
Temperature Adjustment ..............................................................................16
CONTROL SYSTEM OPERATION .......................................................................17
Heating Element Operation ..........................................................................17
Control System Features .............................................................................17
Control System Navigation ...........................................................................17
The Desktop Screen ....................................................................................17
Temperatures Menu .....................................................................................20
Heater Status Menu .....................................................................................22
Economy Mode Setup Menu ........................................................................22
Economy Mode Settings ..............................................................................24
Alarm Output Setup Menu ............................................................................27
Display Settings Menu .................................................................................27
Heater Information Menu .............................................................................27
Current Fault / Alert Menu ............................................................................28
Fault History Menu .......................................................................................28
Fault Occurrence Menu ................................................................................28
Restore Factory Defaults Menu ...................................................................29
MAINTENANCE ....................................................................................................30
General ........................................................................................................30
Anode Inspection and Replacement ............................................................30
Temperature-Pressure Relief Valve Operation .............................................30
Flushing ........................................................................................................30
Sediment Removal .......................................................................................30
Lime Scale Removal ....................................................................................30
TROUBLESHOOTING CHECKLIST .....................................................................32
Not Enough or No Hot Water .......................................................................32
Water Is Too Hot ...........................................................................................32
Water Heater Makes Strange Sounds ..........................................................32
Leakage Checkpoints ...................................................................................32
PIPING DIAGRAMS ..............................................................................................33
NOTES ..................................................................................................................45
WARRANTY ..........................................................................................................47
5
dIMensIons and capacItIes data
table 1.
DSE
Tank Capacity
Maximum
KW Input
All Dimensions in Inches (mm) Approximate Shipping Wt.
Gallons Liters A B C D Lbs. Kg.
5 19 3 20 1/2 521 mm 16 1/4 412.75 mm 22 1/2 571.5 mm 5 1/4 133.35 mm 82 37.2
10 38 6 26 1/4 667 mm 18 3/4 476.25 mm 25 635 mm 5 1/4 133.35 mm 106 48.1
20 76 18 27 1/4 692 mm 20 1/2 520.7 mm 26 1/2 673.1 mm 5 3/4 146.05 mm 130 59
30 114 24 35 3/4 908 mm 20 1/2 520.7 mm 26 1/2 673.1 mm 5 3/4 146.05 mm 150 68
40 151 36 45 3/4 1,162 mm 20 1/2 520.7 mm 26 1/2 673.1 mm 5 3/4 146.05 mm 190 86.2
50 189 90 54 3/4 1,391 mm 20 1/2 520.7 mm 26 1/2 673.1 mm 5 3/4 146.05 mm 221 100.2
65 246 90 50 1/2 1,283 mm 26 1/2 673.1 mm 33 1/2 850.9 mm 7 177.8 mm 267 121.1
80 303 90 49 1/4 1,251 mm 28 711.2 mm 35 889 mm 7 177.8 mm 285 129.3
100 379 90 58 1/4 1,480 mm 28 711.2 mm 35 889 mm 7 177.8 mm 354 160.6
120 450 90 63 1/4 1,607 mm 30 762 mm 37 939.8 mm 7 1/2 190.5 mm 420 190.5
table 2.
RECOVERY RATE IN GALLONS PER HOUR *
Temperature Rise °F
STANDARD
KW INPUT
BTU/
HOUR
30° 40° 50° 60° 70° 80° 90° 100° 110° 120° 130° 140°
3 10,239 41 31 24 20 17 15 13 12 11 10 10 9
6 20,478 82 62 49 41 35 31 27 25 22 21 19 18
9 30,717 123 92 74 62 53 46 41 37 34 31 28 26
12 40,956 164 123 98 82 70 61 55 49 45 41 38 35
15 51,195 205 154 123 102 88 77 68 61 56 51 47 44
18 61,434 246 184 148 123 105 92 82 74 67 62 57 53
24 81,912 328 246 197 164 140 123 109 98 90 82 76 70
30 102,390 410 308 246 205 176 154 137 123 112 103 95 88
36 122,868 492 369 295 246 211 184 164 148 134 123 113 105
45 153,585 615 461 369 307 263 230 205 184 168 154 142 132
54 184,302 738 554 443 359 316 277 246 221 201 185 170 158
60 204,780 819 615 492 410 351 307 273 246 223 205 189 176
75 255,975 1025 768 615 512 439 384 341 307 279 256 236 219
90 307,170 1229 922 738 615 527 461 410 369 335 307 284 263
fIGure 1.
6
features and coMponents
Below is an illustration of the water heater with its features called out. The text of this manual will refer to the items shown.
fIGure 2.
uIM - user Interface Module
(on front of hinged access door)
7
locatInG the new water heater
approVals
Model and ratInG
facts to consIder about the locatIon
Carefully choose a location for the new water heater. The placement
is a very important consideration for the safety of the occupants in
the building and for the most economical use of the water heater.
Whether replacing an old water heater or putting the water heater in
a new location, the following critical points must be observed. The
water heater must be located:
1. On a level surface. Shim the channel type skid base as
necessary if levelling is required.
2. Near a oor drain. The 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.
3. The discharge opening of the temperature and pressure relief
valve should always be piped to an open drain.
4. Close to the point of major hot water usage and the power
supply.
Hot water piping and branch circuit wiring should be as short as possible.
Insulate hot and cold water piping where heat loss and condensation
may be a problem.
Heater construction permits installation, maintenance, and service
work to be performed through the front control panel.
Suggested clearances from adjacent surfaces are 12 inches on top,
30 inches in front for access to the unit.
The heater may be installed on or against combustible surfaces. The
left side and back may be placed ush against adjacent surfaces.
The temperature of the space in which the water heater is installed
must not go below 32°F or above 122°F.
All models meet National
Sanitation Foundation
NSF-5 requirements.
All models are listed
by Underwriters
Laboratories Inc.
8
requIred abIlIty
Installation and service of this water heater requires ability
equivalent to that of a qualied agency (page 2) in the eld involved.
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 code requirements, follow NFPA-70
(current edition). 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.
Note:To comply with NSF Standard 5 installation requirements
the bottom of the water heater must be sealed to the oor with a
silicone based sealant or elevated 6 inches above the oor.
Do not test electrical system before heater is filled 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 illustration in Figure 2.
MIXINGVALVEUSAGE:
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 inrm, 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. 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.
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.
Products of this sort should not be stored near the heater. Also, air
which is brought in contact with the water heater should not contain
any of these chemicals. If necessary, uncontaminated air should be
obtained from remote or outside sources.
cIrculatInG puMp
Field installed circulating pumps should be of all bronze construction.
teMperature-pressure relIef ValVe
This water heater is provided with a properly rated/sized and
certied combination temperature - pressure relief valve by the
11 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.
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.
InstallatIon
9
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.
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.
• Shall 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.
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
will not cause any 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 of this manual for technical
assistance.
Once the water heater is installed and lled with water, check
the operation of the temperature-pressure relief valve. Follow the
instructions in the Maintenance section of this manual.
water lIne connectIons
This manual provides detailed piping installation diagrams (see back
section of this manual) for typical methods of application. For the heater
inlet and outlet connections, di-electric unions are recommended. The
water heater may be installed by itself, or with a separate storage
tank, on both single and two-temperature systems. When used with
a separate storage tank, the circulation may be either by gravity or by
means of a circulating pump. When a circulating pump is used it is
important to note that the ow rate should be slow so that there will be
a minimum of turbulence inside the heater.
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 effects of thermal expansion.
Contact a local plumbing service agency to have a thermal
expansion tank installed.
10
electrIcal data
General
Check the water heater model and rating plate information against
the characteristics of the branch circuit electrical supply. Do not
connect the heater to an improper source of electricity.
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 water
heater tank is lled with water. Doing so may cause the heating
elements to fail.
The installation must conform to these instructions and the local
code authority having jurisdiction. Grounding and electrical wiring
connected to the water heater must also conform to the National
Electrical Code, NFPA 70. This publication is available from The
National Fire Protection Association, 1 Batterymarch Park, Quincy,
MA 02269.
branch cIrcuIt
The branch circuit wire size should be established through reference
to the NEC (National Electrical Code) or other locally approved
sources in conjunction with the water heater amperage rating.. Wire
rated at 75°C should be used. For convenience, portions of the wire
size tables from the Code are reproduced in Table 3. It is suggested
the electrician size the branch circuit at 125 percent of the heater
rating and further increase wire size as necessary to compensate
for voltage drop in long runs. Voltage drop should not exceed 3% at
the water heater.
heater cIrcuIts
The water heater’s electrical components are pictured and identied
in the Features and Components illustrations in Figure 2. The model
and rating plate provides heater circuit ratings. There are two main
electrical circuits:
Control Circuit: Power supply for the electromagnetic
contactor coils. 120V power is supplied to the contactor coils
by the CCB (Central Control Board) see wiring diagrams in
this manual.
Power Circuit: High voltage, single or three phase, circuit that
carries the heating element load.
The following section and pages describe the water heater circuits
and includes wiring diagrams.
control cIrcuIts
The water heater is equipped with an electronic control system.
The system includes a CCB (Central Control Board), an immersion
temperature probe with ECO for temperature sensing and limiting, a
UIM (User Interface Module) for user interface & information display
and element current sensors for monitoring the power circuits. Refer
to the control circuit label on the water heater for details. The CCB
is powered by a small 120V/24V transformer. The control circuit
operates on 120V supplied by a larger 100VA transformer.
sequence of operation
1. When the control is powered, the UIM should display model
information, water temperature, operating setpoint, heating
status and operating mode.
2. If the control determines that the actual water temperature inside
the tank is below the programmed operating setpoint minus the
(1st) differential setpoint, a call for heat is activated.
3. After all safety checks are veried the CCB will energize the
contactor coil(s). On models with more than one heating
element the upper most heating elements are energized rst.
Successive heating elements are energized according to
programmed differential setpoints for each heating element.
4. The control remains in the heating mode until the water
temperature reaches the programmed operating setpoint. At
this point the contactors will be de-energized.
5. The control system now enters the standby operating mode
while continuing to monitor the water temperature and the state
of other system devices. If the water temperature drops below
the programmed Operating Setpoint minus the (1st) differential
setpoint, the control will automatically return to step 2 and repeat
the heating cycle.
power cIrcuIt
Power circuit wiring is type THHN (or equivalent) rated 600 volts,
105°C, sized as necessary.
The following wiring diagrams are included in this manual to show
typical arrangements of electrical components in the control and
power circuits by voltage and phase characteristics. They are to be
used as a reference by the installer or servicer in performing their
work. An actual diagram of the water heater wiring is furnished with
the heater.
11
table 3.
Allowable Ampacities of Insulated Conductors
Not More Than Three Conductors in Raceway or Cable or Earth (Directly Buried), Based on Ambient Temperature of 30°C (86°F)
Size Temperature Rating of Conductor Size
60°C
(140°F)
75°C
(167°F)
85°C
(185°F)
90°C
(194°F)
60°C
(140°F)
75°C
(167°F)
85°C
(185°F)
90°C
(194°F)
AWG
MCM
TYPES
RUW, T
TW, UF
TYPES
FEPW
RH, RHW
RUH,
THW,
THWN,
XHHW
USE, ZW
TYPES
V, MI
TYPES
TA, TBS
SA, AVB
SIS, =FEP,
=FEPB,
=RHH,
=THHN,
=XHHW*
TYPES
RUW, T
TW, UF
TYPES
RH, RHW
RUH
THW,
THWN
XHHW,
USE
TYPES
V, MI
TYPES
TA, TBS,
SA, AVB
SIS,
=RHH,
=THHN,
=XHHW*
AWG
MCM
COPPER ALUMINUM OR COPPER-CLAD ALUMINUM
18
16
14
12
10
8
......
......
15
20
30
40
......
......
15
20
30
45
......
22
25
30
40
50
21
22
25
30
40
50
......
......
......
15
25
30
......
......
......
15
25
40
......
......
......
25
30
40
......
......
......
25
30
40
......
......
......
12
10
8
6
4
3
2
1
55
70
80
65
85
100
115
130
70
90
105
120
140
70
90
105
120
140
40
55
65
75
50
65
75
90
100
55
70
80
95
110
55
70
80
95
110
6
4
3
2
1
0
00
000
0000
150
175
200
230
155
185
210
235
155
185
210
235
120
135
155
180
125
145
165
185
125
145
165
185
0
00
000
0000
250
300
350
400
500
255
285
310
335
380
270
300
325
360
405
270
300
325
360
405
205
230
250
270
310
215
240
260
290
330
215
240
260
290
330
250
300
350
400
500
CORRECTION FACTORS
Ambient
Temperature
°C
31-40
41-50
51-60
61-70
71-80
For ambient temperatures over 30°C, multiply the ampacities shown by the appropriate correction factor to determine the maximum
allowable load current.
Ambient
Temperature
°F
.82
.58
......
......
......
.88
.75
.58
.35
......
.90
.80
.67
.52
.30
.91
.82
.71
.58
.41
.82
.58
......
......
......
.88
.75
.58
.35
......
.90
.80
.67
.52
.30
.91
.82
.71
.58
.41
86 –104
105–122
123–141
142–158
159–176
= The load current rating and the overcurrent protection for these conductors shall not exceed 15 amperes for 14 AWG, 20 amperes for 12 AWG, and 30 amperes for 10
AWG copper; or 15 amperes for 12 AWG and 25 amperes for 10 AWG aluminum and copper-clad aluminum.
table 4.
standard kw Inputs
standard
kw
ratings
Immersion
heaters***
number of 50a contractors
full load current In amperes
single phase three phase
no. of
wattage
208V 240V 480V 208V 240V 277V 480V 208V 240V 480V
3
6
9
12
15
1 3,000
1 6,000
1 9,000
1 12,000
1 15,000
1
1
1
14.4
28.8
43.3
57.7
72.1
86.5
115.4
144.2
173.1
216.3
N/A
N/A
N/A
N/A
12.5
25.0
37.5
50.0
62.5
75.0
100.0
125.0
150.0
187.5
225.0
250.0
N/A
N/A
10.8
21.2
32.5
43.3
54.2
65.0
86.6
108.3
130.0
162.5
194.9
216.6
N/A
N/A
6.3
12.5
18.8
25.0
31.3
37.5
50.0
62.5
75.0
93.8
112.5
125
156
188
8.3
16.7
25.0
33.3
41.6
50.0
66.6
83.3
99.9
124.9
149.9
166.7
208.4
250
7.2
14.4
21.7
28.9
36.1
43.3
57.7
72.2
86.6
108.3
129.9
145
181
217
3.6
7.2
10.8
14.4
18.0
21.7
28.9
36.1
43.3
54.1
65.0
72
90
108
18*
24
30
1 18,000
2 12,000
2 15,000
2
2
36*
45
54
2 18,000
3 15,000
3 18,000
3 3
2
60** 4 15,000 4 4
75** 5 18,000
5 5 3
90** 5 18,000
* 208V models use one additional immersion heater.
** Available on 50 gallon models or larger.
*** Each immersion heater contains three electric elements.
12
wIrInG dIaGraMswIrInG dIaGraMs
dIaGraM 1.
sMall coMMercIal wIre dIaGraM
208-240V / 3ph
dIaGraM 2.
sMall coMMercIal wIre dIaGraM
208-240V / 3-1ph
13
3-1 phase conVersIons
In the case where the unit is phase convertible and it has only one contactor, jumper wires (provided) must be added according to the
phase of the supply voltage. See the diagram below. For single-phase connection, jumpers A-C and B-D must be added. For three-
phase connection, jumper B-C must be added.
3-1 phase contactor juMper confIGuratIon
1 phase connectIon 3 phase connectIon
dIaGraM 3.
sMall coMMercIal wIre dIaGraM
sInGle phase
14
dIaGraM 4.
sMall coMMercIal wIre dIaGraM
300-600V / 3ph
dIaGraM 5.
sMall coMMercIal electrIc
300-600V 3ph, linear or progressive
15
operatIon
General
Refer to the Features and Components section of this manual for the
location of components mentioned in the instructions that follow.
neVer operate the heating elements without being certain the water
heater is lled with water, and a temperature and pressure relief valve
is installed in the relief valve opening on top of the heater.
Some models will be equipped with an optional LWCO (low water
cut off). The water probe is installed in the storage tank – see the
Features and Components illustrations at the beginning of this
manual for location. The control system will declare a Fault condition
and lock out (de-energize contactor coils and heating elements) if
the water level is below this point.
The pilot switch (power on/off toggle switch) on the cabinet front
permits the heater to be turned on and off without having to operate
the electrical disconnect switch.
Optional manual override switches on the cabinet front allow elements
to be manually de-energized if full capacity is not needed.
fIllInG the water heater
To ll the water heater with water:
1. Turn off the electrical disconnect switch.
2. Turn off pilot toggle switch.
3. Close the heater drain valve.
4. Open a nearby hot water faucet to allow the air in the system to escape.
5. Fully open the cold water inlet valve, lling the heater and piping.
6. Close the hot water faucet when water starts to ow from the
faucet. Leave the cold water inlet valve fully open. The heater is
now ready for start up and temperature regulation.
7. Close the cabinet door and perform start up checks listed below
before turning on the electricity.
InItIal start up
The following checks should be made by the installer when the water
heater is placed into operation for the rst time:
1. Check all factory and eld made water and electrical
connections for tightness. Also check connections on top of the
heater. Repair water leaks and tighten electrical connections
as necessary.
2. Turn on the electrical disconnect switch and pilot toggle switch.
The pilot toggle switch is located on cabinet.
3. Observe the operation of the electrical components during the
rst heating cycle. use care as the electrical circuits are
energized.
Temperature control and contactor operation should be checked
by allowing heater to come up to temperature and shut off
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/
or exposed to freezing temperatures. Maintenance and service
procedures may also require draining the heater.
1. Turn off the electrical disconnect switch.
2. Turn off pilot toggle switch.
3. Open a nearby hot water faucet until the water is no longer hot.
4. Close the cold water inlet valve to heater.
5. Open drain valve.
6. If the heater is being drained for an extended shutdown, it is
suggested the drain valve be left open during this period.
Follow FILLING instructions when restoring hot water service, see
the list above.
16
hIGh teMperature lIMIt controls (eco)
This water heater is equipped with an ECO (energy cut out) non
adjustable high temperature limit control. An ECO is a normally
closed switch that opens (activates) on a rise in temperature. If the
ECO switch contacts open (activate) due to abnormally high water
temperatures the control system will lock-out and disable further
heating element operation. It is important that a qualied service
agent be contacted to determine the reason for the ECO activation
before resetting the ECO. Once the reason has been determined
and corrected the ECO can be reset as follows:
The ECO high temperature limit switch is located inside the immersion
temperature probe (two red wires). The ECO switch contacts will open
when the water temperature reaches approximately 202°F/94°C and
close at approximately 120°F/49°C. When the ECO switch contacts
open (activate) the electronic control system locks out and displays a
Fault message. Voltage to the contactor coils and heating elements
is terminated to prevent further heating operation. Should the ECO
activate, the water temperature must drop below 120°F/49°C before
the control system can be reset. Once the water temperature has
cooled below this point the power supply to the water heater must be
turned off and on again to reset the control system.
therMostat controls
The water heaters covered in this instruction manual are equipped
with adjustable thermostat controls to control water temperature. Hot
water temperatures required for automatic dishwasher and laundry
use can cause scald burns resulting in serious personal injury and/
or death. The temperature at which injury occurs varies with the
person’s age and duration of exposure. The slower response time
of children, the elderly or disabled persons increases the hazards to
them. Never allow small children to use a hot water tap or draw their
own bath water. Never leave a child or disabled person unattended in
a bathtub or shower. The water heater should be located in an area
where the general public does not have access to set temperatures.
Setting the water heater temperatures at 120°f will reduce the
risk of scalds. Some States require settings at specic lower
temperatures.
Figure 3. shows the approximate time-to-burn relationship for normal
adult skin.
teMperature adjustMent
The water heaters covered in this instruction manual are equipped
with an electronic control system. The control system senses
temperature from a factory installed immersion temperature probe
– see the Features and Components illustrations at the beginning
of this manual for location. The “Operating Set Point” is adjusted to
control water temperature. This is an adjustable user setting in the
control system’s “Temperatures Menu.” This and all control system
menus are accessed through the UIM (User Interface Module - see
Figure 3.) located on the front panel of the water heater.
The Operating Set Point is adjustable from 90°F/42°C to 190°F/88°C.
The factory setting is 120°F/49°C. See the Control System Operation
section of this manual for instructions on how to adjust the Operating
Set Point and other user settings.
Set the Operating Set Point at the lowest setting which produces an
acceptable hot water supply. This will always give the most energy
efcient operation.
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)
fIGure 3.
teMperature reGulatIon
17
control systeM operatIon
heatInG eleMent operatIon
fIGure 4.
Depending on tank size and how they were ordered from the factory
the water heaters covered in this manual may be equipped with 1
to 5 electric heating elements. The illustration here shows how the
heating elements are numbered for control purposes and how the
openings for each heating element are physically located on the
water heater’s storage tank.
control options
The water heaters covered in this manual are factory ordered with 1
of 3 different heating element control options as follows:
On/OffControl: This is the only conguration available on models
equipped with a single heating element and the standard conguration
on models equipped with more than one element. All elements are
cycled on simultaneously with each call for heat, however there is
a one second delay between elements being energized to reduce
starting current. All elements are cycled off at the same time at the
end of each heating cycle.
Linear Sequencing: Only available on models equipped with
multiple heating elements. Elements are energized and de-energized
according to adjustable (1 to 20°F) Differential set points for each
element. Element Rotation - rst element on is rotated with each
successive call for heat. First On/Last Off - the rst heating element
energized at the beginning of a heating cycle is the last element
de-energized at the end of the heating cycle. Successive heating
cycles would progress as follows on a model equipped with 3 heating
elements:
• First heating cycle: Elements come on [1, 2, 3] and cycle off [3, 2, 1].
• Second heating cycle: Elements come on [2, 3, 1] and cycle off [1, 3, 2].
• Third heating cycle: Elements come on: [3, 1, 2] and cycle off [2, 1, 3].
• Fourth heating cycle: pattern repeats - same as rst.
Progressive Sequencing: Only available on models equipped
with multiple heating elements. Elements are energized and de-
energized according to adjustable (1 to 20°F) Differential set points
for each element. Element Rotation - rst element on is rotated with
each successive call for heat. First On/First Off - the rst heating
element energized at the beginning of a heating cycle is the rst
element de-energized at the end of the heating cycle. Successive
heating cycles would progress as follows on a model equipped with
3 heating elements:
• First heating cycle: Elements come on [1, 2, 3] and cycle off [1, 2, 3].
• Second heating cycle: Elements come on [2, 3, 1] and cycle off [2, 3, 1].
• Third heating cycle: Elements come on: [3, 1, 2] and cycle off [3, 1, 2].
• Fourth heating cycle: pattern repeats - same as rst.
control systeM features
advanced diagnostics
Plain English text and animated icons display detailed operational and
diagnostic information. LCD screen on the front of the water heater displays
the Sequence of Operation in real time. Fault or Alert messages are displayed
when operational problems occur. Advanced Service menu displays a list of
possible causes for current Fault and Alert conditions to aid in servicing.
economy Mode operation
Control system automatically lowers the Operating Set Point by a
programmed value during user dened time periods. Helps reduce
operating costs during unoccupied or peak demand periods.
control systeM naVIGatIon
The UIM (User Interface Module) is located on the front cabinet of the water
heater. All operational information and user settings are displayed and
accessed using the UIM. The UIM includes ve snap acting (momentary)
user input buttons; an Up, Down and 3 Operational Buttons.
fIGure 5.
up & down buttons
Used to navigate (up and down) and to select (highlight) menu items.
Also used to adjust or change (increase/decrease, on/off, set time)
various user settings.
operational buttons
The 3 Operational Buttons are multifunctional. Their current function is
dened by the text that appears directly above each button on the LCD
screen. The function will change depending on what menu is currently
displayed or what menu item is selected. When no text appears on the
LCD screen above an Operational Button there is no function assigned.
the desktop screen
The illustration below shows the control system “Desktop Screen.”
This is the default screen. If there are no active Fault or Alert
conditions and no user input for approximately 10 minutes the control
system will return to this screen automatically.
ModelInformation: Model information and menu titles are shown in
the black bar at the top of the Desktop Screen.
TankTemperature: Current water temperature as sensed from the
immersion Temperature Probe.
OperatingSetPoint: Temperature at which the control system will
maintain tank (water) temperature in the Normal Mode. This line of
text will read Economy Set Point whenever the control system is
operating in the Economy Mode.
18
Status: The Operating State of the control system is displayed
beneath the Operating Set Point.
fIGure 6.
Menu: The left Operational Button is pressed to enter the Main Menu
where all control system menus are accessed. See Table 7. for a list
of control system menus.
Help: The right Operational Button is pressed to access instructions
and explanations for user settings, Operating States, Status Icons,
manufacturer’s web address, technical support phone number and
service agent contact information.
Day/Time/Operating Mode: The current time and day are also
displayed on the Desktop Screen. “Clock Not Set” will be displayed
until the time clock has been initially set. Day and Time are adjusted
in the Economy Mode Setup menu. The current Operating Mode,
either Normal Mode or Economy Mode, is displayed beneath the
day and time.
Discreet Menu Contact Information: From the Desktop Screen
press and hold down the middle (unmarked) Operational Button for
30 seconds and then release it. This will launch a discreet menu
where personalized contact information can be entered. Installing
contractors and/or service agents can enter their company name
and telephone number. This contact information will be displayed
with all Fault and Alert messages.
table 5. - status Icons
Icon descrIptIon
Water temperature in the tank has fallen. Shaded area of the animated thermometer icon will rise and fall in response to
water temperature in the storage tank as sensed from the immersion Temperature Probe.
Water temperature in the tank has reached the Operating Set Point. Shaded area of the animated thermometer icon will rise
and fall in response to water temperature in the storage tank as sensed from the immersion Temperature Probe.
The control is unable to initiate a heating cycle. This will happen whenever a Fault condition is detected by the control system
or when either of the two Enable/Disable circuits are open circuits.
The control system is in Heating Mode and has energized the electromagnetic contactor coils for at least one heating
element. This animated icon DOES NOT indicate current has been sensed from the heating elements, only that there is a
call for heat present and the control system has initiated heating element operation.
Heating element icon for a water heater equipped with 1 heating element. Open circles represent elements the control
system has not energized and IS NOT sensing electrical current ow from.
Heating element icon for a water heater equipped with 2 heating elements. Each circle represents one element. Open circles
represent elements the control system has not energized and IS NOT sensing electrical current ow from. Filled circles
represent elements the control system has energized and IS sensing electrical current ow from.
Heating element icon for a water heater equipped with 3 heating elements. Each circle represents one element. Filled circles
represent elements the control system has energized and IS sensing electrical current ow from.
Heating element icon for a water heater equipped with 4 heating elements. Each circle represents one element. Open circles
with an X represent elements the control system has energized that it IS NOT sensing electrical current ow from.
Heating element icon for a water heater equipped with 5 heating elements. Each circle represents one element. Open circles
represent elements the control system has not energized and IS NOT sensing electrical current ow from. Filled circles
represent elements the control system has energized and IS sensing electrical current ow from.
The control has detected/declared a Fault Condition. Fault message details can be viewed in the Current Fault menu.
Heating operation is discontinued (locked out) until the condition that caused the fault is corrected. Power to the water heater
must be cycled off and on to reset the control system. Note; cycling power will not reset the control system if the condition
that caused the fault has not been corrected.
The control has detected/declared an Alert Condition. The water heater will continue to operate during an Alert Condition but
there is an operational condition that requires the attention of a Qualied Service Agent. Alert message details can be viewed
in the Current Alert menu.
19
table 6. - operatInG states
state descrIptIon
Standby
The water heater is not in an active heating cycle. This usually indicates the temperature in the tank has reached the
Operating Set Point and the control system has terminated the heating cycle.
Heating The control system is in the Heating Mode. At least one heating element has been energized.
Alert
The control system has detected/declared an Alert Condition. The controls system will continue heating operation.
However, a Qualied Service Agent should be contacted to check/service the water heater.
Fault
The control system has detected/declared a Fault Condition. The control system will discontinue heating operation and
“lock out.” Power to the water heater must be cycled off and on to reset the control system. Note; cycling power will not
reset the control system until the condition that caused the fault has been corrected.
table 7. - control systeM Menus
Menus descrIptIon
Temperatures
Most commonly accessed menu. Operating Set Point, Differential settings, Tank Temperature and Tank Probe
Offset are located in this menu.
Heater Status
Current Operating State/Mode (heating/standby etc) and status (open/closed - on/off - yes/no) of monitored
water heater functions and components are displayed in this menu.
Economy Mode Setup
Seven day 24 hour time clock with temperature set back capability to reduce operating costs during unoccupied
or reduced demand periods.
Alarm Output Setup
The control system’s CCB (Central Control Board - see wiring diagrams) features on board SPDT (single pole
double throw) relay contacts for building EMS (Energy Management System) notication of operational conditions
such as Fault Conditions and heating mode status. This menu features a list of user denable conditions for
relay activation.
Display Settings
Temperature units (°F or °C), appearance (brightness contrast) and backlight delay user adjustable settings are
located in this menu.
Heater Information
Elapsed time of operation, total heating cycle time, heating cycle count, heating element(s) cycle count and on
time along with UIM and CCB software revisions can be viewed in this menu.
Current Fault/Alert
Displays any current Alert or Fault messages.
Fault History
Retains 9 event history of Fault/Alert messages with time stamp. The Fault History is useful when dealing with
intermittent operational problems or when the customer has reset the control system prior to a service agent’s
arrival.
Fault Occurrence
Total accumulated number each individual Fault condition has occurred is displayed in this menu. This
running total of Fault Occurrences can be useful in determining which (if any) operational problems have been
persistent.
Restore Factory Defaults
This control system feature allows the user to restore control system user settings to their factory default settings.
Alarm Output Setup and Display Settings menu items ARE NOT changed when factory defaults are restored.
Help Menu
Accessible by pressing the corresponding Operational Button from most menus and screen displays. This menu
provides access to instructions and explanations for user settings, Operating States, Status Icons, manufacturer’s
web address, technical support phone number and service agent contact information.
20
teMperatures Menu
operating set point
User adjustable setting 90°F to 190°F range; factory default is
120°F. When the water temperature sensed by the control system
from the immersion Temperature Probe reaches the Operating Set
Point the control system will end the heating cycle. A call for heat
will be activated again when the water temperature drops below the
Operating Set Point minus the 1st Differential Setting.
Example: Operating Set Point is 120°F, the 1st Differential Setting is
2°F (factory default). A call for heat will be activated when the sensed
water temperature drops to 118°F.
differential settings
Adjustable user setting(s) 1°F to 20° range; factory default is 2°F.
The water heaters covered in this manual will have between 1
and 5 heating elements. There is at least one Differential Setting
on all models. There will be additional Differential Settings for each
additional heating element installed.
operating sequence
On a water heater equipped with 3 heating elements, with an
Operating Set Point of 120°F and all Differential settings at 2°F the
On/Off sequencing of heating elements would be as follows:
table 8.
ELEMENT
NUMBER
DIFFERENTIAL
SETTING
TURN ON TEMP TURN OFF TEMP
Element 1 2°F 118°F 120°F
Element 2 2°F 116°F 118°F
Element 3 2°F 114°F 116°F
tank temperature
Non adjustable information display. Current water temperature as
sensed by the control system from the immersion Temperature Probe.
tank probe offset
User adjustable setting -5°F to +5°F range; factory default is 0°F.
If the current Tank Temperature is sensed (from the immersion
Temperature Probe) at 120°F and the offset is adjusted to -5°F the
control system would calibrate or “offset” the Tank Temperature to
115°F. Heating cycles would then start/stop based on the calibrated
Tank Temperature.
Used to calibrate for slight differences in control system temperature
sensing. This can improve the precision of temperature control in the storage
tank and at points of use. This feature can also be used to compensate for
building recirculation loops (hot water returning to the storage tank) that
may cause the heating cycle to terminate prematurely.
21
temperature settings
The Operating Set Point and the Differential Settings are adjusted in the Temperatures Menu. The following instructions explain how to adjust
these user settings and navigate the control system menus.
actIon dIsplay
From the Desktop Screen, press the Operational Button underneath
“MENU” to enter the Main Menu.
Notice how the text above the Operational Buttons on the display
changes as you navigate through the various menus and screens.
With Temperatures selected (highlight in black) in the Main Menu,
press the Operational Button underneath “SELECT” to enter the
Temperature Menu.
If Temperatures is not selected use the Up and Down buttons to select
this menu item.
With the Operating Set Point selected (highlighted in black) in the
Temperatures Menu, press the Operational Button underneath
“CHANGE” to activate the adjustment mode for this menu item.
Press the Up and Down buttons to adjust the Operating Set Point to
the desired setting.
Press the Operational Button underneath “UPDATE” to conrm the new
setting. Press the Operational Button underneath “CANCEL” to discard
the new setting and retain the previous setting.
The new Operating Set Point value should now be displayed as the
current value.
NOTE: Use this same procedure to adjust the Differential settings and
the Tank Probe Offset in the Temperatures Menu.
This same procedure is used to change user settings in other control
system menus.
22
heater status Menu
This menu displays non adjustable operational information. Use the
Up & Down Buttons to navigate to the bottom of this menu.
top of Menu
bottom of Menu
status
Displays the current Operating State of the control system. IE:
Heating, Standby, Fault.
elements on #
Displays the number of heating elements the control system has
energized.
eco contact
Displays the current state of the ECO high temperature limit switch
contacts.
enable / disable 1 & 2
Displays the current state, open or closed, of the two Enable/Disable
circuits (J7 socket on the CCB - see wiring diagrams) provided
for external supervisory controls such as building EMS (Energy
Management System). Both of these Enable/Disable circuits must
be closed to “enable” heating operation. If either Enable/Disable
circuit is open for any reason heating operation will be “disabled.”
There is a plug with two jumper wires installed from the factory in the
CCB J7 socket to enable heating operation when external controls
are not in use.
ServiceNote: If a supervisory control(s) is used to enable/disable
heating operation, install eld wiring between the J7 socket on
the CCB and a set of “dry contacts” on the external control per all
applicable building codes. This is a switching circuit only: DO NOT
apply any external voltage or connect any load (IE: relay coil) to
either circuit.
element # on
Displays the on/off status of each heating element. Yes = On, No =
Off.
tank full
Displays the status of the optional LWCO (Low Water Cut Off) device.
Yes = water level is acceptable, No = water level is low.
alarm condition
Displays the status of the user denable Alarm Output function - see
Alarm Output Setup Menu. Yes = alarm condition has been met, No
= alarm condition has not been met.
alarm relay output
Displays the state of the normally open contacts of the Alarm
Output relay. This relay (J3 contacts on the CCB - see wiring
diagrams) is used for building EMS (Energy Management
System) notification of operational conditions such as Fault
conditions.
econoMy Mode setup Menu
This menu contains settings used to establish an “Economy Set
Point” and “Economy Mode” operating periods. This control system
feature can help reduce operating costs during unoccupied, low load,
or peak demand periods.
desktop screen during economy Mode
economy Mode setup Menu
setpoint adjustment
Adjustable user setting (2°F to 50°F - factory default is
20°F) the control system uses to calculate the “Economy
Set Point.” The Economy Set Point = normal Operating Set
Point minus the programmed Setpoint Adjustment value.
23
The Economy Set Point is the water temperature the control
system maintains during programmed Economy Mode
time periods. “Economy Set Point” is displayed instead of
“Operating Set Point” and “Economy Mode” appears beneath
the current time on the Desktop Screen during Economy
Mode time periods.
current time
Seven Day 24 hr clock. Use this menu item to set the current time
and day of the week. Current day and time are not set from the
factory. “Clock Not Set” will be displayed on the Desktop until the
time/day has been initially set. Note: the time will not self adjust for
Daylight Savings time.
heater In economy Mode
Displays whether the control system is currently operating in
Economy Mode or not.
daily operating Mode (sun - Mon - tue - wed - thu - fri - sat)
Seven daily sub menus are listed at the bottom of the Economy
Mode Setup menu. There are 3 Operating Modes in each sub menu;
“Normal Operation All Day” - “Economy Mode All Day” and “Normal
Operation Between.” Only one Operating Mode can be active, the
factory default is Normal Operation All Day.
NormalOperationAllDay: When this operating mode is active the
normal Operating Set Point is used for the entire day.
EconomyModeAll Day: When this operating mode is active the
Economy Set Point is used for the entire day.
Normal Operation Between: When this operating mode is active
there will also be start and stop times to program. The normal
Operating Set Point is used between the programmed start and stop
times and the Economy Set Point will be in effect during the rest of
the day. There is one start time and one stop time event per day.
24
econoMy Mode settInGs
setpoint adjustment Value
actIon dIsplay
From the Desktop screen, press the Operational Button underneath
“MENU” to enter the Main Menu.
Notice how the text above the Operational Buttons on the display
changes as you navigate through the various menus and screens.
Use the Up/Down buttons to select (highlight in black) the Economy
Mode Setup menu from the Main Menu. Press the Operational Button
underneath “SELECT” to enter the Economy Mode Setup menu.
Use the Up/Down buttons to select (highlight in black) Setpoint
Adjustment. Press the Operational Button underneath “CHANGE” to
activate the adjustment mode for the Setpoint Adjustment value.
Use the Up/Down buttons to change the Setpoint Adjustment to the
desired value. The Setpoint Adjustment value is adjustable from 2°F to
50°F. The factory default is 20°F.
Notice how the text above the Operational Buttons on the display changes
to “UPDATE” & “CANCEL” when the adjustment mode is activated and
how the current value is outlined rather than highlighted in black.
Press the Operational Button underneath “UPDATE” to enter and conrm
the new value. Pressing the Operational Button underneath “CANCEL”
would discard the new value and retain the previous value.
The new Setpoint Adjustment value should now be displayed as the
current value.
25
econoMy Mode settInGs
time clock settings
actIon dIsplay
From the Desktop Screen navigate to the Economy Mode Setup menu.
Use the Up/Down buttons to select (highlight in black) Current Time sub
menu. Press the Operational Button underneath “CHANGE” to enter the
Current Time sub menu.
Use the Up/Down buttons to select the “Weekday” setting.
Press the Operational Button underneath “CHANGE” to activate the
adjustment mode for this setting.
Press the Up and Down buttons to adjust the Weekday setting to the
current day.
Notice how the text above the Operational Buttons on the display changes
to “ACCEPT” & “CANCEL” when the adjustment mode is activated and
how the current setting is outlined rather than highlighted in black.
Press the Operational Button underneath “ACCEPT” to enter and conrm
the new setting. Pressing the Operational Button underneath “CANCEL”
would discard the new setting and retain the previous setting.
Use the Up/Down and the CHANGE/ACCEPT Operational Buttons to
individually select and change the remaining time settings (Hour, Minutes,
AM/PM) to the current time in the same way as outlined above.
When nished making changes press the Operational Button underneath
“BACK” to conrm all new settings and update the control system. The
display will automatically return to the Economy Mode Setup menu.
The new settings should be displayed as the Current Time.
26
econoMy Mode settInGs
daily operating Mode settings
ACTION DISPLAY
economy Mode all day:
From the Economy Mode Setup menu use the Up/Down buttons to
select (highlight in black) the Daily sub menu for “Sun.” Press the
Operational Button underneath “CHANGE” to enter this menu.
Use the Up/Down buttons to select (highlight in black) the “Economy
Mode All Day” setting.
Press the Operational Button underneath “SELECT” to change from
the factory default Normal Operation All Day setting to the Economy
Mode All Day setting.
Press the Operational Button underneath “BACK” to conrm the
new setting and update the control system. You will be returned to
the Economy Mode Setup menu. The new setting should now be
displayed for Sun.
normal operation between:
From the Economy Mode Setup menu Use the Up/Down and
CHANGE buttons to enter the Mon sub menu as described above.
Use the Up/Down buttons to select (highlight in black) the “Normal
Operation Between” setting. Press the Operational Button
underneath “SELECT” to change the operating mode for Monday to
Normal Operation Between. Note that when this setting is selected
Start and Stop time user settings appear on the display.
Use the Up/Down buttons to navigate between the Start and Stop
time Hour, Minutes and AM/PM settings.
With each item selected press the Operational Button underneath
“CHANGE” to activate the adjustment mode for each setting. Use
the Up/Down buttons to change the value to the desired setting.
Press the Operational Button underneath “ACCEPT” to enter the
new setting or “CANCEL” to discard the new setting and retain the
previous setting.
Press the Operational Button underneath “BACK” when nished to
conrm the new settings and update the control system. The display
will return to the Economy Mode Setup menu with the new settings
shown for Mon.
27
alarM output setup Menu
Permits user to set the condition (from a list of options) for when
the CCB’s integral alarm output relay will be energized. Alarm relay
connections (common, normally open, normally closed) are located on
the J3 terminal strip on the CCB - see wiring diagrams. Alarm output
relay contacts are capable of switching 1 amp maximum at 120 Vac.
The alarm relay operates in the background according to the settings
in this menu and is not capable of disabling water heater operation.
The alarm relay is used for external notication/verication of
various operational conditions such as fault conditions and heating
mode status. This relay can be used with building EMS (Energy
Management System) and other external supervisory controls.
output function
Adjustable user setting. Available options for the Alarm Output
Function setting are:
HeatingMode: Used for heating mode on/off status notication.
Enable/DisableClosed: Used for notication and/or verication of
the enable/disable circuits open/closed status. There are two enable/
disable circuits available for external supervisory control(s) at the J7
socket on the CCB - see wiring diagrams. Enable/disable circuit(s)
status can be viewed in the Heater Status Menu.
Temp<HeaterSP: Used for external notication when current tank
temperature drops below Operating Set Point.
Temp<AlarmSP: Used for external notication when current tank
temperature drops below programmable Alarm SP.
Fault or Alert: Used for external notication whenever a Fault or
Alert condition is active.
Fault: Used for notication whenever a Fault condition is active.
Disabled: Disables the Alarm Relay Output Function.
alarm sp
Adjustable user setting (90°F to 190°F) the control system uses for
the “Temp < Alarm SP” function described above. This setting has no
effect with any other Alarm Output functions.
alarm output settings
Changing the user settings in this menu is done using the same
methods for changing the Operating Set Point.
ServiceNote: Adjustable user settings in the Alarm Output Setup
menu are unaffected by Restore Factory Defaults.
dIsplay settInGs Menu
Permits user to set display options for viewing information on the
UIM’s LCD screen.
temperature units
Adjustable user setting that changes temperature units display to
Celsius °C or Fahrenheit °F.
backlight delay
Adjustable user setting that determines how long the UIM’s LCD
backlight remains illuminated after a key has been pressed. Available
settings are; Always Off, 10, 30 or 60 seconds and Always On.
contrast
Adjustable user setting to adjust the UIM’s LCD screen contrast
between text and background.
display settings
Changing the user settings in this menu is done using the same
methods for changing the Operating Set Point.
ServiceNote: Adjustable user settings in the Display Settings menu
are unaffected by Restore Factory Defaults.
heater InforMatIon Menu
This menu displays non adjustable operational information.
top of Menu
28
bottom of Menu
elapsed time
Total accumulated time the control system (water heater) has been
energized.
total heating time
Total accumulated time the control system has been in the heating
mode. IE: any heating elements have been energized.
element # cycles
Total accumulated count of heating cycles for each heating
element.
element # on time
Total accumulated heating on time for each heating element.
ccb Version
Software version for Central Control Board.
uIM Version
Software version for User Interface Module
current fault / alert Menu
This menu displays non adjustable operational information. With the
Fault History sub menu selected in Main Menu; press the Operational
Button underneath “SELECT” to display the current Fault or Alert
message. If there is not a Fault or Alert condition currently active
“(none)” is displayed to the right of this menu.
Main Menu - current fault selected
fault hIstory Menu
This menu displays non adjustable operational information. The
control system records and stores the last 9 Fault and Alert
messages in chronological order in this menu. The most recent
will be at the top of the list. A time stamp is displayed below each
listed Fault and Alert message showing when the Fault or Alert
condition occurred.
The Fault History is useful when dealing with intermittent operational
problems or when the customer has reset the control system prior to
a service agent’s arrival.
With a Fault or Alert item selected press the Operational Button
underneath “VIEW” to display the details for the Fault or Alert
message. The Fault/Alert message screen displays a brief description
of the condition, contact information and access to the Advanced
service information sub menu.
fault history Menu
current/history fault Message
fault occurrence Menu
Total accumulated number each individual Fault condition has
occurred is displayed in this menu. This running total of Fault
Occurrences can be useful in determining which (if any) operational
problems have been persistent.
fault occurrence Menu
29
restore factory defaults Menu
This control system menu allows the user to restore most of the control system’s user settings to their factory default
settings. user settings in the alarm output setup and display settings menus are unaffected by executing restore
factory defaults.
restore factory defaults
actIon dIsplay
From the Main Menu use the Up/Down buttons to select (highlight in
black) the “Restore Factory Defaults” menu.
Press the Operational Button underneath “SELECT.” The Restore
Factory Defaults menu will be displayed.
From the Restore Factory Defaults menu press the Operational Button
underneath “YES.” The display will show text conrming the factory
default settings have been restored.
Press the Operational Button underneath “BACK” to exit the Restore
Factory Defaults menu.
30
MaIntenance
General
Water heater maintenance includes inspection and testing of the
Temperature Pressure Relief Valve, periodic tank ushing and
cleaning, and removal of lime scale from the heating elements. Where
used, water heating system circulating pumps should be oiled.
Tank ushing and element maintenance should be performed
in accordance with the maintenance schedule, see Table 9.
Tank sediment removal and element lime scale removal must be
performed when needed as determined by periodic inspections.
anode InspectIon and replaceMent
This water heater is equipped with a non sacricial powered anode
rod and a sacricial anode. Sacricial anodes protect the glass lined
tank from corrosion by sacricing themselves through electrolysis.
When the anode material is consumed, there is no more protection
and corrosion of the tank accelerates. Powered anode rods are non
sacricial and should not need to be replaced unless damaged.
Inspection of the sacricial anode every 6 to 12 months allows you to
identify a spent anode and replace it. Replace the anode when its diameter
is 3/8” (1 cm) of an inch, or annually which ever is rst. Aggressive, very
hot and softened water causes rapid consumption of the anode requiring
frequent inspections. Call the toll free number on the back cover of this
manual for information on obtaining replacement anode rods.
teMperature-pressure relIef ValVe operatIon
The teMperature-pressure relIef ValVe must be
manually operated at least once a month. Lift the lever at the top
of valve several times until the valve seats properly and operates
freely, see Figure 7.
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 the
water may be extremely hot. Use care when operating valve as
the valve may be hot.
fIGure 7.
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 the Start Up
section of this manual, and replace the temperature-pressure relief
valve with a properly rated/sized new one.
If the temperature-pressure relief valve on the water heater weeps
or discharges periodically, this may be due to thermal expansion.
Consult your local water supplier or a Qualied Service Agency
for further information. do not pluG the teMperature-
pressure relIef ValVe.
Component Operation Interval Required
Tank
Flushing Monthly
Sediment
Removal
As Needed
Elements
Lime Scale
Removal
As Needed
UN-LIME
delimer and
element gaskets
table 9. MaIntenance schedule.
flushInG
The water heater drain valve should be opened periodically to help
prevent sediment buildup on the tank bottom.
1. Turn off the electrical disconnect switch.
2. Open a nearby hot water faucet until the water is no longer hot,
then close the hot water faucet.
3. Attach hose to outlet opening of drain valve and direct end to drain.
• Open the drain valve by turning the hand wheel to the left
(counterclockwise). Allow water to ow until it runs clean.
• If water does not ow from opened drain valve, follow
instructions for sediment removal.
4. When nished ushing:
• Close heater drain valve and remove hose.
• Turn on electricity.
sedIMent reMoVal
Water borne impurities consist of ne particles of soil and sand which
settle out and form a layer of sediment on the bottom of the tank. In
time, if not removed, the level of sediment might reach the heating
elements and cause their failure.
For convenience, sediment removal and element lime scale removal
should be performed at the same time as follows.
lIMe scale reMoVal
Lime scale accumulations on the heating elements is a normal
condition, common to all immersion type elements. Factors which
affect the amounts of this formation are:
1. Amount of hot water used. As the volume of the water heated
increases, more scale results.
2. Water temperature. As the temperature of the water is increased,
more scale is deposited on the elements.
31
3. Characteristics of water supply.
Regardless of water treatment, the elements should be
examined regularly.
Lime scale accumulations may cause noises to occur during
operation.
It is recommended that a heating element be removed periodically
for examination. If it is scaled, all of the elements should be removed
and cleaned. If the tank bottom has an accumulation of sediment it
should be cleaned.
Lime scale should be removed by dissolving the accumulation in
UN-LIME
®
delimer. Do not use muriatic or hydrochloric acid base
deliming solutions to remove lime scale from the elements.
THEPROCESSFORLIMESCALEREMOVALISASFOLLOWS:
1. Turn off electrical disconnect switch.
2. Drain the heater following DRAINING instructions.
3. Open front panel.
4. Disconnect the element wiring. Try not to disturb the wiring
unnecessarily and reconnection will be easier.
5. Unscrew each element.
6. Remove the elements and gaskets from the openings.
• Use a twisting, pulling action to remove elements scaled
beyond the size of the tank openings.
• Brush loose scale from elements.
7. Lime scale removal:
• Place limed ends of heating elements into UN-LIME delimer
and allow scale to dissolve. Do not permit delimer or water
to contact heating element electrical terminals.
• Silicates, sulfates, and aluminates must be removed
by scraping or other mechanical means. Lime scale
dissolvents will not remove these types of scale which are
occasionally encountered.
Call the toll free phone number on the back cover of this Instruction
Manual to purchase UN-LIME and heating element gaskets.
OTHERSCALEREMOVAL:
1. Flush cleaned ends of elements with water when deliming or
cleaning is completed.
2. Remove sediment and scale from the tank bottom through
the access provided by the element openings or drain valve
opening.
• The cold water inlet valve and drain valve may be opened
to aid the cleanout process.
3. Clean remaining gasket material from tank and element anges.
Don not reuse original element gaskets.
4. Put new gaskets on each element and install into tank openings.
• Uniformly tighten element bolts. Torque to approximately
32 ft/lbs.
5. Attach element wires to connection points from which they were
removed.
6. Follow FILLING instructions to restore hot water service.
• Check for water leaks around elements and proper
operation when heater is lled.
• Close the panel.
32
troubleshootInG 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.
The illustration in the Features and Components section of this
manual identies the location of most of the heater components.
BE SURE TO TURN OFF THE ELECTRICITY (ELECTRICAL
DISCONNECT SWITCH) WHEN CHECKING EQUIPMENT.
not enouGh or no hot water
1. Be certain the electrical disconnect switch serving the water
heater is in the ON position. The pilot toggle switch on the
cabinet should be ON.
In some areas water heater electrical service may be limited
by the power company. If the heater operates on a controlled
circuit, heater recovery may be affected.
The optional manual override switches on the cabinet front may
be turned off, de-energizing the elements.
2. Check the fuses.
The electrical disconnect switch usually contains fuses.
The water heater has fuses located behind the cabinet front
door, see the Features and Components section of this manual
for their location.
3. If the water was excessively hot, and is now cold, the ECO high
limit switch may have activated.
• See the Temperature Regulation section of this manual for
more information on how to reset the ECO high limit controls.
Repeated activation of the ECO high limit switch should be
investigated by a Qualied Service Agent.
4. The storage capacity and/or recovery rate of the water heater
may have been exceeded by a large demand for hot water. See
the Recovery Data tables in this manual.
Large demands require a recovery period to restore water temperature.
5. Cold incoming water temperature will lengthen the time required
to heat water to the desired temperature.
If the heater was installed when incoming water temperature
was warm, colder water creates the effect of less hot water.
7. Sediment or lime scale may be affecting water heater operation.
Refer to the MAINTENANCE section of this manual for details.
water Is too hot
Refer to the TEMPERATURE REGULATION section of this manual.
water heater Makes stranGe sounds
1. 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. Refer to MAINTENANCE section of this
manual for details.
2. Some of the electrical components of the water heater make
sounds which are normal ie. contactors will “Click” or snap as
the heater starts and stops.
leakaGe checkpoInts
1. Check to see if the drain valve is tightly closed.
2. The apparent leakage may be condensation which forms on
cool surfaces of the heater and piping.
3. If the outlet of the relief valve is leaking it may represent:
Excessive water pressure.
Excessive water temperature.
Faulty temperature and pressure relief valve.
Excessive water pressure is the most common cause of relief valve
leakage. 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.
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 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 effects of thermal expansion.
Contact a local qualied service agency to have a thermal expansion
tank installed.
4. Examine the ange area of the elements for gasket leakage.
Tighten the bolts or, if necessary, follow the WATER AND LIME
SCALE REMOVAL procedure in the MAINTENANCE section of this
manual to replace the gaskets.
If you cannot IdentIfy or correct the source
OFMALFUNCTION:
1. Place the water heater electrical disconnect switch in the OFF
position.
2. Close the cold water inlet valve to the heater.
3. Call the toll free number on the back cover of this manual for
further assistance.
33
pIpInG dIaGraMs
NOTES:
1. Preferred piping diagram.
2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system.
3. Service valves are shown for servicing unit. However, local codes shall govern their usage.
COMMERCIAL ELECTRIC - (1 UNIT)
LEGEND
TEMPERATURE & PRESSURE
RELIEF VALVE
PRESSURE RELIEF VALVE
CIRCULATING PUMP
TANK TEMPERATURE CONTROL
DRAIN
FULL PORT BALL VALVE
TEMPERATURE GAGE
WATER FLOW SWITCH
CHECK VALVE
WARNING: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND OTHER DEVICES;
CHECK WITH LOCAL CODES AND ORDINANCES
FOR ADDITIONAL REQUIREMENTS.
FINISHED
FLOOR
HOT WATER
TO FIXTURES
FUSED
DISCONNECT
SWITCH
HOT WATER
RETURN
EXPANSION
TANK
COLD WATER
SUPPLY
PIPE T&P TO
OPEN DRAIN
34
NOTES:
1. Preferred piping diagram.
2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system.
3. Service valves are shown for servicing unit. However, local codes shall govern their usage.
4. The Tank Temperature Control should be wired to and control the pump between the water heater(s) and the storage tank(s).
5. The water heater’s operating thermostat should be set 5 degrees F higher than the Tank Temperature Control.
COMMERCIAL ELECTRIC - (1 UNIT) WITH VERTICAL STORAGE TANK
LEGEND
TEMPERATURE & PRESSURE
RELIEF VALVE
PRESSURE RELIEF VALVE
CIRCULATING PUMP
TANK TEMPERATURE CONTROL
DRAIN
FULL PORT BALL VALVE
TEMPERATURE GAGE
WATER FLOW SWITCH
CHECK VALVE
WARNING: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND OTHER DEVICES;
CHECK WITH LOCAL CODES AND ORDINANCES
FOR ADDITIONAL REQUIREMENTS.
FINISHED
FLOOR
HOT WATER
TO FIXTURES
FUSED
DISCONNECT
SWITCH
EXPANSION
TANK
ALT. COLD WATER
CONNECTION
HOT WATER
RETURN
COLD WATER
SUPPLY
PIPE T&P TO
OPEN DRAIN
35
NOTES:
1. Preferred piping diagram.
2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system.
3. Service valves are shown for servicing unit. However, local codes shall govern their usage.
4. The Tank Temperature Control should be wired to and control the pump between the water heater(s) and the storage tank(s).
5. The water heater’s operating thermostat should be set 5 degrees F higher than the Tank Temperature Control.
COMMERCIAL ELECTRIC - (1 UNIT) WITH HORIZONTAL STORAGE TANK
LEGEND
TEMPERATURE & PRESSURE
RELIEF VALVE
PRESSURE RELIEF VALVE
CIRCULATING PUMP
TANK TEMPERATURE CONTROL
DRAIN
FULL PORT BALL VALVE
TEMPERATURE GAGE
WATER FLOW SWITCH
CHECK VALVE
WARNING: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND OTHER DEVICES;
CHECK WITH LOCAL CODES AND ORDINANCES
FOR ADDITIONAL REQUIREMENTS.
FINISHED
FLOOR
HOT WATER
TO FIXTURES
EXPANSION
TANK
ALTERNATE
LOCATION
HOT WATER
RETURN
COLD WATER
SUPPLY
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
36
NOTES:
1. Preferred piping diagram.
2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system.
3. Service valves are shown for servicing unit. However, local codes shall govern their usage.
COMMERCIAL ELECTRIC - (2 UNITS)
LEGEND
TEMPERATURE & PRESSURE
RELIEF VALVE
PRESSURE RELIEF VALVE
CIRCULATING PUMP
TANK TEMPERATURE CONTROL
DRAIN
FULL PORT BALL VALVE
TEMPERATURE GAGE
WATER FLOW SWITCH
CHECK VALVE
WARNING: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND OTHER DEVICES;
CHECK WITH LOCAL CODES AND ORDINANCES
FOR ADDITIONAL REQUIREMENTS.
EXPANSION
TANK
HOT WATER
RETURN
COLD WATER
SUPPLY
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
HOT WATER
TO FIXTURES
37
NOTES:
1. Preferred piping diagram.
2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system.
3. Service valves are shown for servicing unit. However, local codes shall govern their usage.
4. The Tank Temperature Control should be wired to and control the pump between the water heater(s) and the storage tank(s).
5. The water heater’s operating thermostat should be set 5 degrees F higher than the Tank Temperature Control.
COMMERCIAL ELECTRIC - (2 UNITS) WITH VERTICAL STORAGE TANK
LEGEND
TEMPERATURE & PRESSURE
RELIEF VALVE
PRESSURE RELIEF VALVE
CIRCULATING PUMP
TANK TEMPERATURE CONTROL
DRAIN
FULL PORT BALL VALVE
TEMPERATURE GAGE
WATER FLOW SWITCH
CHECK VALVE
WARNING: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND OTHER DEVICES;
CHECK WITH LOCAL CODES AND ORDINANCES
FOR ADDITIONAL REQUIREMENTS.
FINISHED
FLOOR
HOT WATER
TO FIXTURES
EXPANSION
TANK
ALT. COLD WATER
CONNECTION
HOT WATER
RETURN
COLD WATER
SUPPLY
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
38
NOTES:
1. Preferred piping diagram.
2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system.
3. Service valves are shown for servicing unit. However, local codes shall govern their usage.
4. The Tank Temperature Control should be wired to and control the pump between the water heater(s) and the storage tank(s).
5. The water heater’s operating thermostat should be set 5 degrees F higher than the Tank Temperature Control.
COMMERCIAL ELECTRIC - (2 UNITS) WITH HORIZONTAL STORAGE TANK
LEGEND
TEMPERATURE & PRESSURE
RELIEF VALVE
PRESSURE RELIEF VALVE
CIRCULATING PUMP
TANK TEMPERATURE CONTROL
DRAIN
FULL PORT BALL VALVE
TEMPERATURE GAGE
WATER FLOW SWITCH
CHECK VALVE
WARNING: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND OTHER DEVICES;
CHECK WITH LOCAL CODES AND ORDINANCES
FOR ADDITIONAL REQUIREMENTS.
FINISHED
FLOOR
HOT WATER
TO FIXTURES
ALTERNATE
LOCATION
EXPANSION
TANK
HOT WATER
RETURN
COLD WATER
SUPPLY
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
39
NOTES:
1. Preferred piping diagram.
2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system.
3. Service valves are shown for servicing unit. However, local codes shall govern their usage.
COMMERCIAL ELECTRIC - (3 UNITS)
LEGEND
TEMPERATURE & PRESSURE
RELIEF VALVE
PRESSURE RELIEF VALVE
CIRCULATING PUMP
TANK TEMPERATURE CONTROL
DRAIN
FULL PORT BALL VALVE
TEMPERATURE GAGE
WATER FLOW SWITCH
CHECK VALVE
WARNING: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND OTHER DEVICES;
CHECK WITH LOCAL CODES AND ORDINANCES
FOR ADDITIONAL REQUIREMENTS.
HOT WATER
TO FIXTURES
EXPANSION
TANK
HOT WATER
RETURN
COLD WATER
SUPPLY
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
PIPE T&P TO
OPEN DRAIN
FUSED
DISCONNECT
SWITCH
40
NOTES:
1. Preferred piping diagram.
2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system.
3. Service valves are shown for servicing unit. However, local codes shall govern their usage.
4. The Tank Temperature Control should be wired to and control the pump between the water heater(s) and the storage tank(s).
5. The water heater’s operating thermostat should be set 5 degrees F higher than the Tank Temperature Control.
COMMERCIAL ELECTRIC - (3 UNITS) WITH VERTICAL STORAGE TANK
LEGEND
TEMPERATURE & PRESSURE
RELIEF VALVE
PRESSURE RELIEF VALVE
CIRCULATING PUMP
TANK TEMPERATURE CONTROL
DRAIN
FULL PORT BALL VALVE
TEMPERATURE GAGE
WATER FLOW SWITCH
CHECK VALVE
WARNING: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND OTHER DEVICES;
CHECK WITH LOCAL CODES AND ORDINANCES
FOR ADDITIONAL REQUIREMENTS.
HOT WATER
TO FIXTURES
FINISHED
FLOOR
ALT. COLD WATER
CONNECTION
EXPANSION
TANK
HOT WATER
RETURN
COLD WATER
SUPPLY
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
41
NOTES:
1. Preferred piping diagram.
2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system.
3. Service valves are shown for servicing unit. However, local codes shall govern their usage.
4. The Tank Temperature Control should be wired to and control the pump between the water heater(s) and the storage tank(s).
5. The water heater’s operating thermostat should be set 5 degrees F higher than the Tank Temperature Control.
COMMERCIAL ELECTRIC - (3 UNITS) WITH HORIZONTAL STORAGE TANK
LEGEND
TEMPERATURE & PRESSURE
RELIEF VALVE
PRESSURE RELIEF VALVE
CIRCULATING PUMP
TANK TEMPERATURE CONTROL
DRAIN
FULL PORT BALL VALVE
TEMPERATURE GAGE
WATER FLOW SWITCH
CHECK VALVE
WARNING: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND OTHER DEVICES;
CHECK WITH LOCAL CODES AND ORDINANCES
FOR ADDITIONAL REQUIREMENTS.
HOT WATER
TO FIXTURES
FINISHED
FLOOR
ALTERNATE
LOCATION
EXPANSION
TANK
HOT WATER
RETURN
COLD WATER
SUPPLY
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
42
NOTES:
1. Preferred piping diagram.
2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system.
3. Service valves are shown for servicing unit. However, local codes shall govern their usage.
COMMERCIAL ELECTRIC - (4 UNITS)
LEGEND
TEMPERATURE & PRESSURE
RELIEF VALVE
PRESSURE RELIEF VALVE
CIRCULATING PUMP
TANK TEMPERATURE CONTROL
DRAIN
FULL PORT BALL VALVE
TEMPERATURE GAGE
WATER FLOW SWITCH
CHECK VALVE
WARNING: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND OTHER DEVICES;
CHECK WITH LOCAL CODES AND ORDINANCES
FOR ADDITIONAL REQUIREMENTS.
EXPANSION
TANK
HOT WATER
RETURN
COLD WATER
SUPPLY
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
HOT WATER
TO FIXTURES
43
NOTES:
1. Preferred piping diagram.
2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system.
3. Service valves are shown for servicing unit. However, local codes shall govern their usage.
4. The Tank Temperature Control should be wired to and control the pump between the water heater(s) and the storage tank(s).
5. The water heater’s operating thermostat should be set 5 degrees F higher than the Tank Temperature Control.
COMMERCIAL ELECTRIC - (4 UNITS) WITH VERTICAL STORAGE TANK
LEGEND
TEMPERATURE & PRESSURE
RELIEF VALVE
PRESSURE RELIEF VALVE
CIRCULATING PUMP
TANK TEMPERATURE CONTROL
DRAIN
FULL PORT BALL VALVE
TEMPERATURE GAGE
WATER FLOW SWITCH
CHECK VALVE
WARNING: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND OTHER DEVICES;
CHECK WITH LOCAL CODES AND ORDINANCES
FOR ADDITIONAL REQUIREMENTS.
HOT WATER
TO FIXTURES
FINISHED
FLOOR
EXPANSION
TANK
HOT WATER
RETURN
COLD WATER
SUPPLY
ALT. COLD
WATER
CONNECTION
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
44
NOTES:
1. Preferred piping diagram.
2. The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system.
3. Service valves are shown for servicing unit. However, local codes shall govern their usage.
4. The Tank Temperature Control should be wired to and control the pump between the water heater(s) and the storage tank(s).
5. The water heater’s operating thermostat should be set 5 degrees F higher than the Tank Temperature Control.
COMMERCIAL ELECTRIC - (4 UNITS) WITH HORIZONTAL STORAGE TANK
LEGEND
TEMPERATURE & PRESSURE
RELIEF VALVE
PRESSURE RELIEF VALVE
CIRCULATING PUMP
TANK TEMPERATURE CONTROL
DRAIN
FULL PORT BALL VALVE
TEMPERATURE GAGE
WATER FLOW SWITCH
CHECK VALVE
WARNING: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND OTHER DEVICES;
CHECK WITH LOCAL CODES AND ORDINANCES
FOR ADDITIONAL REQUIREMENTS.
HOT WATER
TO FIXTURES
ALTERNATE
LOCATION
FINISHED
FLOOR
EXPANSION
TANK
HOT WATER
RETURN
COLD WATER
SUPPLY
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
FUSED
DISCONNECT
SWITCH
PIPE T&P TO
OPEN DRAIN
45
notes
46
notes
47
effectIVe
For 3 Years, in the event of a tank leak, we will repair or, at our
discretion, replace the defective water heater.
For 1 Year, in the event of part failure, we will repair or, at our
discretion, replace the defective part.
We warrant this product against defects in materials or
workmanship as described in this document if installed within
the United States or Canada and provided the product remains
at its original place of installation.
Warranty coverage begins the date of installation OR the date of
manufacture if installation cannot be veried.
what's coVered
Subject to these terms, in the event of defect in materials and/
or workmanship resulting in a tank leak during the rstthree
years, we will:
• Replace the water heater should the tank leak.
Subject to these terms, in the event of a defect in materials and/or
workmanship appearing during the rstyear, we will:
• Repair or, at our discretion, replace any part of the water
heater covered under this limited warranty excluding parts
subject to normal maintenance (Example: non-electronic
anode rod, lter, etc)
service/labor, shipping, delivery, installation, handling or any
other costs are not covered at any time under this warranty.
Any replacement part or product will be warranted only for
the unexpired portion of the original water heater’s limited
warranty period.
If an identical model is no longer available due to a change in law,
regulation, or standard, we will replace the product with one having
comparable capacity and input. In these instances, the owner will
have the option of paying the difference between what was paid for
the original model and the new model with the additional features,
or receiving a refund of the portion of the purchase price, on a
pro-rata basis allocable to the unexpired portion of the warranty.
what's not coVered
• Problems caused by improper: gas supply line sizing, gas type,
venting, connections, combustion air, voltage, wiring, or fusing
• Failure to follow applicable codes
• Failure to follow printed instructions
• Abuse, misuse, accident, re, ood, Acts of God
• Improper installation, sizing, delivery, or maintenance
• Claims related to rust, noise, smell, or taste of water
• Failure to conduct authorized factory start up if required
• Alterations to the water heater
• Non-outdoor heaters installed outdoors
• Damages due to a failure to allow for thermal expansion
• Heat exchanger failure due to lack of adequate / proper supply
of water
• Heaters moved from their original location
• Service trips to explain proper installation, use, or maintenance
of the product/unit or to describe compliance requirements
under applicable codes and regulations
• Charges related to accessing your heater including but not
limited to door/wall removal, equipment rental, etc.
• Replacement parts after expiration of this warranty
lIMItatIons
NOTWITHSTANDING ANYTHING ELSE TO THE CONTRARY,
THIS IS YOUR SOLE AND EXCLUSIVE WARRANTY.
ALL OTHER WARRANTIES INCLUDING A WARRANTY
OF MERCHANTABILITY OR FITNESS FOR PARTICULAR
PURPOSE ARE EXPRESSLY DISCLAIMED. SELLER SHALL
NOT BE LIABLE FOR ANY CONSEQUENTIAL, INCIDENTAL,
SPECIAL, PUNITIVE OR OTHER INDIRECT DAMAGES. TOTAL
LIABILITY ARISING AT ANY TIME SHALL NOT EXCEED THE
PURCHASE PRICE PAID WHETHER BASED ON CONTRACT,
TORT, STRICT LIABILITY OR ANY OTHER LEGAL THEORY.
SERVICEINQUIRIES:
for service inquiries call the telephone number listed below. Be prepared to provide the following information:
name, address, and telephone number; the model and serial number of the water heater; proof of installation; and a clear description
of the problem.
For your records, fill in the product:
Serial: ___________________
Model: ___________________
U.S. Customers: Canadian Customers:
a. o. smith corporation p. o. box 310 – 768 erie street
500 tennessee waltz parkway stratford (ontario) n5a 6t3
ashland city, tennessee 37015 800-265-8520
800-527-1953
www.hotwater.com
coMMercIal
water heater
lIMIted warranty
A DIVISION OF A. O. SMITH CORPORATION
RENTON, WASHINGTON
Technical Support: 800 527-1953
Parts Department: 800 433-2515
www.hotwater.com
Copyright © 2014 A. O. Smith Corporation, All rights reserved.
