PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS
REQUIRED.
PRINTED 0624 100380318_2000198507E
Instruction Manual
LIGHT SERVICE COMMERCIAL ELECTRIC WATER HEATERS
MODELS: 66/80/120 GALLONS
SERIES 250
INSTALLATION - OPERATION - SERVICE - MAINTENANCE
LOW LEAD
CONTENT
Read and understand this instruction
manual and the safety messages
herein before installing, operating or
servicing this water heater.
Failure to follow these instructions and
safety messages could result in death
or serious injury.
This manual must remain with the
water heater.
Thank you for buying this energy ecient water heater. We
appreciate your condence in our products.
If the water heater becomes immersed
in water up to or above the level of the
bottom of the element doors, the
heater should be examined by a
qualified service agency before it is
placed in operation.
Electrical Shock Hazard
2
CONTENTS
APPROVALS ....................................................................................... 3
GENERAL SAFETY INFORMATION ..................................................... 4
Do Not Use if Damaged .......................................................................4
Grounding Instrucons ........................................................................4
Liming the Risk of Scalding ................................................................4
Hydrogen Gas (Flammable) .................................................................4
Important Denions ..........................................................................4
Hazard Messages .................................................................................5
INTRODUCTION ................................................................................ 8
Preparing for the Installaon ............................................................... 8
FEATURES AND COMPONENTS ......................................................... 9
Performance Data ..............................................................................10
Model and Rang ..............................................................................10
INSTALLATION CONSIDERATIONS ...................................................11
Locang the Water Heater ................................................................11
Clearances .........................................................................................11
WATER HEATER INSTALLATION ........................................................12
Required Ability .................................................................................12
General ..............................................................................................12
Contaminated Water .........................................................................12
Circulang Pump ...............................................................................12
Insulaon Blankets ............................................................................12
Temperature-Pressure Relief Valve .................................................... 13
Closed Water Systems .......................................................................13
Thermal Expansion ............................................................................14
Electrical ............................................................................................14
START UP ..........................................................................................16
Filling the Water Heater.....................................................................16
Inial Start Up ....................................................................................16
Draining the Water Heater ................................................................16
TEMPERATURE REGULATION ..........................................................17
Liming the Risk of Scalding ..............................................................17
Temperature Adjustment...................................................................17
MAINTENANCE ................................................................................19
Draining and Flushing ........................................................................19
Lime Scale Removal ...........................................................................19
Anode Rod Maintenance ...................................................................20
Temperature-Pressure Relief Valve Test ............................................21
Repair Parts List .................................................................................22
TROUBLESHOOTING CHECKLIST ......................................................23
Checklist.............................................................................................23
Checking for Leaks .............................................................................24
WIRING DIAGRAMS .........................................................................25
Light Service Commercial Electric Water Heaters • 3
APPROVALS
LOW LEAD
CONTENT
4 • Light Service Commercial Electric Water Heaters
GENERAL SAFETY INFORMATION
DO NOT USE IF DAMAGED
DO NOT USE THIS WATER HEATER IF ANY PART HAS BEEN
EXPOSED TO FLOODING OR WATER DAMAGE.
Immediately
call a qualied service technician to inspect the water heater and to
replace any part of the control system which has been under water.
If the unit is exposed to the following, do not operate heater unl all
correcve 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 errac
control system operaon.
This water heater must be connected to a grounded metal, permanent
wiring system; or an equipment grounding conductor must be run with
the circuit conductors and connected to the equipment grounding
terminal or lead on the water heater.
LIMITING THE RISK OF SCALDING
For a variety of reasons, water heaters can produce water that is much
hoer than its temperature seng. Take precauons to prevent this
higher temperature water from reaching the water xtures.
Burn Hazard
To reduce the risk of unusually hot
water reaching the fixtures in the
house, install thermostatic mixing
valves at each point of use.
A properly adjusted thermostac mixing valve at each point of use
allows you to set the tank temperature to a higher seng without
increasing risk of scalds. A higher temperature seng allows the
tank to provide much more hot water and can help provide proper
water temperatures for appliances such as dishwashers and washing
machines.
Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or shower-
ing.
Temperature limiting devices such as
thermostatic point-of-use mixing
valves must be installed when
required by codes and to ensure safe
temperatures at fixtures.
HYDROGEN GAS (FLAMMABLE)
Explosion Hazard
Flammable hydrogen gases
may be present.
Keep all ignition sources away
from faucet when turning on
hot water.
Hydrogen gas can be produced in a hot water system served by this
heater that has not been used for a long period of me (generally two
weeks or more). Hydrogen gas is extremely ammable. To reduce the
risk of injury under these condions, it is recommended that the hot
water faucet be opened for several minutes at the kitchen sink before
using any electrical appliance connected to the hot water system. If
hydrogen is present there will probably be an unusual sound such as
air escaping through the pipe as the water begins to ow.
THERE
SHOULD BE NO SMOKING OR OPEN FLAME NEAR THE FAUCET
AT THE TIME IT IS OPEN.
When servicing this unit, verify the power to the unit is turned o prior to opening the control cabinet door.
IMPORTANT DEFINITIONS
• Qualied Installer or Service Agency:
Installation and service of this water heater requires ability
equivalent to that of a Qualied Agency (as dened by ANSI
below) in the eld involved. Installaon skills such as plumbing,
electrical supply are required in addion to electrical tesng skills
when performing service.
• ANSI Z223.1 2006 Sec. 3.3.83:
“Qualied Agency” - “Any individual, rm, corporaon or company
that either in person or through a representave is engaged in
and is responsible for (a) the installaon, tesng or replacement
of gas piping or (b) the connecon, installaon, tesng, repair
or servicing of appliances and equipment; that is experienced in
such work; that is familiar with all precauons required; and that
has complied with all the requirements of the authority having
jurisdicon.”
General Safety Informaon
Light Service Commercial Electric Water Heaters • 5
HAZARD MESSAGES
Your safety and the safety of others is extremely important in the
installaon, use and servicing of this water heater. Many safety-related
messages and instrucons have been provided in this manual and on
your own water heater to warn you and others of a potenal injury
hazard. Read and obey all safety messages and instrucons throughout
this manual. It is very important that the meaning of each safety
message is understood by you and others who install, use or service
this water heater.
Many safety-related messages and instrucons have been provided in this manual and on your own water heater to warn you and others of a
potenal injury hazard. Read and obey all safety messages and instrucons throughout this manual. It is very important that the meaning of
each safety message is understood by you and others who install, use, or service this water heater.
DANGER
WARNING
CAUTION
CAUTION
DANGER indicates an imminently
hazardous situation which, if not avoided,
will result in injury or death.
This is the safety alert symbol. It is used to alert you to
potential personal injury hazards. Obey all safety
messages that follow this symbol to avoid possible
injury or death. Keep this manual near the water heater.
WARNING indicates a potentially hazardous
situation which, if not avoided, could result
in injury or death.
CAUTION indicates a potentially hazardous
situation which, if not avoided, could result
in minor or moderate injury.
CAUTION used without the safety alert
symbol indicates a potentially hazardous
situation which, if not avoided, could result in
property damage.
All safety messages will generally tell you about the type of hazard, what can happen if you do not follow the safety message, and how to
avoid the risk of injury.
Read and understand this instruction
manual and the safety messages
herein before installing, operating or
servicing this water heater.
Failure to follow these instructions and
safety messages could result in death
or serious injury.
This manual must remain with the
water heater.
If the water heater becomes immersed
in water up to or above the level of the
bottom of the element doors, the
heater should be examined by a
qualified service agency before it is
placed in operation.
Electrical Shock Hazard
Burn Hazard
To reduce the risk of unusually hot
water reaching the fixtures in the
house, install thermostatic mixing
valves at each point of use.
6 • Light Service Commercial Electric Water Heaters
General Safety Informaon
Explosion Hazard
Flammable hydrogen gases
may be present.
Keep all ignition sources away
from faucet when turning on
hot water.
● Before removing any access panels or
servicing the water heater, make sure
the the electrical supply to the water
heater is turned OFF.
Electrical Shock Hazard
● Failure to follow these instructions can
result in personal injury or death.
Property Damage Hazard
The expansion tank should be located in an area
where water leakage from the tank or connections
will not result in damage to the area around the
expansion tank or to the lower floors of the structure.
CAUTION
Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or shower-
ing.
Temperature limiting devices such as
thermostatic point-of-use mixing
valves must be installed when
required by codes and to ensure safe
temperatures at fixtures.
Property Damage Hazard
•
All water heaters eventually leak.
•
Do not install without adequate drainage.
CAUTION
Explosion Hazard
Temperature-Pressure Relief Valve
must comply with ANSI Z21.22-
CSA 4.4 and ASME code.
Properly sized temperature-
pressure relief valve must be
installed in opening provided.
Can result in overheating and
excessive tank pressure.
Can cause serious injury or death.
Property Damage Hazard
The temperature-pressure relief-valve discharge pipe
must terminate at an adequate drain.
Locate the water heater near an adequate drain and
in an area where water leakage from the heater or
connec�ons will not result in damage to the area or
the lower floors of the structure.
⚠
CAUTION
● Before removing any access panels or
servicing the water heater, make sure
the the electrical supply to the water
heater is turned OFF.
Electrical Shock Hazard
● Failure to follow these instructions can
result in personal injury or death.
Property Damage Hazard
To avoid water heater damage, fill tank with water
before operating.
CAUTION
General Safety Informaon
Light Service Commercial Electric Water Heaters • 7
The temperature of the water in the water
heater can exceed the thermostat se�ng and
be hot enough to cause burns.
If you choose a higher temperature se�ng,
install thermosta�c mixing valves at each
point-of-use to help avoid scalding.
⚠
WARNING
Burn Hazard
Burn hazard.
Hot water discharge.
Keep clear of the Relief Valve
discharge outlet.
⚠
DANGER
Burn Hazard
The discharge water from the drain valve is hot enough
to cause burns.
Keep your hands clear of the drain valve discharge
outlet.
CAUTION
Property Damage Hazard
Operating the water heater with depleted or
malfunctioning anodes can damage the water
heater.
Annual inspection and replacement of the anode
rod is required.
8 • Light Service Commercial Electric Water Heaters
INTRODUCTION
Thank You for purchasing this water heater. Properly installed and
maintained, it should give you years of trouble free service.
Abbreviaons Found In This Instrucon Manual:
• ANSI - American Naonal Standards Instute
• AHRI - Air-Condioning, Heang and Refrigeraon Instute
• NEC - Naonal Electrical Code
• NFPA - Naonal Fire Protecon Associaon
• UL - Underwriters Laboratory
PREPARING FOR THE INSTALLATION
● Before removing any access panels or
servicing the water heater, make sure
the the electrical supply to the water
heater is turned OFF.
Electrical Shock Hazard
● Failure to follow these instructions can
result in personal injury or death.
1. Read the “General Safety Informaon” secon of this manual rst and then
the enre 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 instrucons for the installaon, operaon, 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 instrucons are essenal to the proper operaon of the water heater
and your safety.
READ THE ENTIRE MANUAL BEFORE ATTEMPTING
TO INSTALL OR OPERATE THE WATER HEATER
.
Be sure to turn o power when working on or near the electrical system
of the heater. Never touch electrical components with wet hands or when
standing in water. When replacing fuses always use the correct size for the
circuit. See
Figure 9
(page 25).
The model and rang plates on page 4 interprets certain markings into
useful informaon. Both of these references should be used to idenfy the
heater, its components and oponal equipment.
2. The installaon must conform with these instrucons and the local code
authority having jurisdicon and the requirements of the power company.
In the absence of local codes, the installaon must comply with the latest
edions of the
National Electrical Code, NFPA 70
or the
Canadian Electrical
Code CSA C22.1
. The
National Electrical Code
may be ordered from: Naonal
Fire Protecon Associaon, 1 Baerymarch Park, Quincy, MA 02269.
The Canadian Electrical Code is available from the Canadian Standards
Associaon, 8501 East Pleasant Valley Road, Cleveland, OH 44131.
3. If aer reading this manual you have any quesons or do not understand
any poron of the instrucons, call the toll free number listed on the back
cover of this manual for technical assistance.
A sample rang plate is shown on page 10 of this manual. In order to
expedite your request, please have full model and serial number available
for the technician.
4. Carefully plan your intended placement of the water heater. Examine the
locaon to ensure the water heater complies with the “Locang the New
Water Heater” secon in this manual.
Installaon and service of this water heater requires ability equivalent to
that of a licensed tradesman or qualied agency (page 4) in the eld
involved. Plumbing and electrical work are required.
Light Service Commercial Electric Water Heaters • 9
FEATURES AND COMPONENTS
This page shows a typical water heater installaon..
JUNCTION BOX
COLD
† OVER CURRENT PROTECTION MUST BE SUPPLIED IN WATER HEATER CIRCUIT. CONSULT LOCAL CODE OR CURRENT EDITION OF NEC FOR PROPER INSTALLATION.
Install suitable drain pans under water heaters to prevent damage due to leakage. See
Locating the Water Heater
(page 11).
Property Damage Hazard
The expansion tank should be located in an area
where water leakage from the tank or connections
will not result in damage to the area around the
expansion tank or to the lower floors of the structure.
CAUTION
Install thermal expansion tank if check valve or pressure reducing valve
is used in supply line.
VACUUM RELIEF
VALV E
*INSTALL PER
LOCAL CODES
Install vacuum relief in cold water inlet line as required by local
codes.
Figure 1. Typical Water Heater Installations
10 • Light Service Commercial Electric Water Heaters
Introducon
PERFORMANCE DATA
Table 1. Recovery Capacies
Element
Waage
(Upper/Lower)
INPUT
kW
U.S. Gallons/Hr and Liters/Hr at Temperature Rise Indicated
F° 36F° 40F° 54F° 60F° 72F° 80F° 90F° 100F° 108F° 120F° 126F°
C° 20C° 22.2C° 30C° 33.3C° 40C° 44.4C° 50C° 55.5C° 60C° 66.6C° 70C°
Simultaneous Operaon
6100/6100
12.2
GPH 140 126 93 84 70 63 56 50 47 42 40
LPH 531 478 354 318 265 239 212 191 177 159 152
Recovery capacies at 100° F rise equal: for non-simultaneous element operaon = 4.1 gal. x kW of one element; for simultaneous element
operaon = 4.1 gal. x 2/3 kW of both elements. For other rises mulply element kW as previously explained by 410 and divide by temperature
rise. Full load current for single phase = total was : voltage.
MODEL AND RATING
MODEL NUMBER
22U1
COMMERCIAL STORAGE
TANK WATER HEATER
WATTS
LOWER
MAX WORKING
PRESSURE PSI
1 PH / 3 PH
1 PH 3 PH
RATED
MEASURED
%
WATTS
INTERLOCK SIMULTANEOUS CAPACITY US GAL STANDBY LOSS
TOTAL WATTS CONNECTED
SERIAL NUMBER
ITEM ID / PART NUMBER
WATTS
PHASE
CIRCUIT
VOLTS - AC
UPPER
LLC
Light Service Commercial Electric Water Heaters • 11
INSTALLATION CONSIDERATIONS
A
B
C
8"
HOT
CONNECTION
ANODE
ROD
COLD
CONNECTION
C
Figure 2. Rough-in Dimensions
Table 2. Rough-In Dimensions
Tank Capacity A B C
Approx.
Shipping Weight
US Gals. Liters inches cm inches cm inches cm Lbs. Kg.
66 250 60.13 153 52.75 134 22 56 146 66.22
80 303 60.50 154 52.25 133 24 61 174 78.93
119 450 61.38 156 54.38 138 28 71 268 121.56
LOCATING THE WATER HEATER
Property Damage Hazard
•
All water heaters eventually leak.
•
Do not install without adequate drainage.
CAUTION
The water heater should be located as close as possible to/or
centralized to the water piping system. The water heater should be
located in an area not subject to freezing temperatures.
The water heater should be located in an area where leakage of the
tank or connecons will not result in damage to the area adjacent to
the heater or to lower oors of the structure.
When such locaons cannot be avoided, a suitable drain pan should
be installed under the heater.
Such pans should be at least two inches deep, have a minimum length
and width of at least two inches greater than the diameter of the heater
and should be piped to an adequate drain.
Drain pans suitable for these water heaters are available from your
distributor.
Water heater life depends upon water quality, water pressure and the
environment in which the water heater is installed. Water heaters are
somemes installed in locaons where leakage may result in property
damage, even with the use of a drain pan piped to a drain. However,
unancipated damage can be reduced or prevented by a leak detector
or water shut-o device used in conjuncon with a piped drain pan.
These devices are available from some plumbing supply wholesalers
and retailers, and detect and react to leakage in various ways:
• Sensors mounted in the drain pan that trigger an alarm or turn
o the incoming water to the water heater when leakage is
detected.
• Sensors mounted in the drain pan that turn o the enre water
supply when water is detected in the drain pan.
• Water supply shut-o devices that acvate based on the water
pressure dierenal between the cold water and how water
pipes connected to the water heater.
• Devices that will turn o the gas supply to a gas water heater
while at the same me shung o its water supply.
CLEARANCES
A minimum clearance of 4” must be allowed for access to replaceable
parts such as thermostats, drain valve and relief valve.
Adequate clearance for servicing this water heater should be
considered before installaon, such as changing the anodes, etc.
12 • Light Service Commercial Electric Water Heaters
WATER HEATER INSTALLATION
REQUIRED ABILITY
Installaon and service of this water heater requires ability equivalent
to that of a qualied installer or service agency in the eld involved.
See
Important Definitions
(page 4). Plumbing and electrical work is
required.
GENERAL
The installaon must conform with these instrucons and the local
code authority having jurisdicon and the requirements of the power
company. In the absence of local codes, the installaon must comply
with the latest edions of the
National Electrical Code, NFPA 70
or the
Canadian Electrical Code CSA C22.1
. The
National Electrical Code
may be
ordered from: Naonal Fire Protecon Associaon, 1 Baerymarch
Park, Quincy, MA 02269. The
Canadian Electrical Code
is available from
the Canadian Standards Associaon, 8501 East Pleasant Valley Road,
Cleveland, OH 44131.
Do NOT
test electrical system before heater is lled with water, follow
the procedure in
Start Up
(page 16).
The principal components of the heater are idened in the
Features
and Components
(page 9).
Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or shower-
ing.
Temperature limiting devices such as
thermostatic point-of-use mixing
valves must be installed when
required by codes and to ensure safe
temperatures at fixtures.
MIXING VALVE USAGE
Water heaters are intended to produce hot water. Water heated
to a temperature which will sasfy space heang, 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 the hot water 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 precauons.
In addition to using the lowest possible temperature setting
that satisfies the demand of the application a means, such as
a thermostatic point-of-use mixing valve, for example, can be
used at the hot water taps used by these people to reduce the
water temperature.
Check State and/or local codes for thermostac point-of-use mixing
valve requirements and installaon pracces.
MIXING VALVES
for reducing point of use temperature are available
and are to be set at a maximum of 125°F. Consult a qualied installer
or service agency. Follow all manufacturer’s Instrucons for installaon
of these valves. Before changing the factory seng on the thermostat,
read the
Temperature Regulation
(page 17)
Property Damage Hazard
•
All water heaters eventually leak.
•
Do not install without adequate drainage.
CAUTION
CONTAMINATED WATER
This water heater shall not be connected to any heang system(s)
or component(s) used with a non-potable water heang appliance.
Toxic chemicals, such as those used for boiler treatment shall not be
introduced into this system.
CIRCULATING PUMP
Field installed circulang pumps should be of all bronze construcon.
INSULATION BLANKETS
Insulaon blankets are available to the general public for external use
on electric water heaters but are not necessary with this product. The
purpose of an insulaon blanket is to reduce the standby heat loss
encountered with storage tank heaters.
Should you choose to apply an insulaon blanket to this heater,
you should follow these instrucons below. Failure to follow these
instrucons can result in re, serious personal injury, or death.
• Do not cover the temperature and pressure relief (T & P) valve
with an insulaon blanket.
• Do not cover the instrucon manual. Keep it on the side of the
water heater or nearby for future reference.
• Do obtain new warning and instrucon labels for placement on
the blanket directly over the exisng labels.
Water Heater Installaon
Light Service Commercial Electric Water Heaters • 13
TEMPERATURE-PRESSURE RELIEF VALVE
Explosion Hazard
Temperature-Pressure Relief Valve
must comply with ANSI Z21.22-
CSA 4.4 and ASME code.
Properly sized temperature-
pressure relief valve must be
installed in opening provided.
Can result in overheating and
excessive tank pressure.
Can cause serious injury or death.
This water heater is provided with a properly rated/sized and cered
combinaon temperature - pressure relief valve by the manufacturer.
The valve is cered by a naonally recognized tesng laboratory that
maintains periodic inspecon of producon of listed equipment of
materials as meeng 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 combinaon temperature and pressure relief valve
rated/sized and cered as indicated in the above paragraph. The new
valve must be marked with a maximum set pressure not to exceed the
marked hydrostac 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 rang plate.
For safe operaon 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 ng 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 restricon and reduce the discharge
capacity of the valve.
No valve or other obstrucon 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 quanes should circumstances demand.
If the discharge pipe is not connected to a drain or other suitable
means, the water ow may cause property damage.
Property Damage Hazard
The temperature-pressure relief-valve discharge pipe
must terminate at an adequate drain.
Locate the water heater near an adequate drain and
in an area where water leakage from the heater or
connec�ons will not result in damage to the area or
the lower floors of the structure.
⚠
CAUTION
The Discharge Pipe:
• Shall not be smaller in size than the outlet pipe size of the valve,
or have any reducing couplings or other restricons.
• Shall not be plugged or blocked.
• Shall be of material listed for hot water distribuon.
• Shall be installed so as to allow complete drainage of both the
temperature-pressure relief valve and the discharge pipe.
• Must terminate a maximum of six inches above a oor drain or
external to the building. In cold climates, it is recommended that
the discharge pipe be terminated at an adequate drain inside the
building.
• Shall not have any valve or other obstrucon between the relief
valve and the drain.
Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or shower-
ing.
Temperature limiting devices such as
thermostatic point-of-use mixing
valves must be installed when
required by codes and to ensure safe
temperatures at fixtures.
The temperature-pressure relief valve must be manually operated at
least once a year. Cauon should be taken to ensure that (1) no one is
in front of or around the outlet of the temperature-pressure relief valve
discharge line, and (2) the water manually discharged can cause bodily
injury or property damage because the water may be extremely hot.
If aer manually operang the valve, it fails to completely reset and
connues to release water, immediately close the cold water inlet to
the water heater, follow the draining instrucons in
Draining the Water
Heater Storage Tank
(page 19), and replace the temperature-pressure
relief valve with a properly rated/sized new one.
If you do not understand these instrucons or have any quesons
regarding the temperature-pressure relief valve call the toll free
number listed on the back cover of this manual for technical assistance.
CLOSED WATER SYSTEMS
Water supply systems may, because of code requirements or such
conditions as high line pressure, among others, have installed
14 • Light Service Commercial Electric Water Heaters
Water Heater Installaon
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 intermient temperature-
pressure relief valve operaon: water discharged from the valve due
to excessive pressure build up. This condion is not covered under the
limited warranty. The temperature-pressure relief valve is not intended
for the constant relief of thermal expansion.
A properly sized thermal expansion tank should be installed on all
closed systems to control the harmful eects of thermal expansion.
Contact a local plumbing service agency to have a thermal expansion
tank installed.
ELECTRICAL
● Before removing any access panels or
servicing the water heater, make sure
the the electrical supply to the water
heater is turned OFF.
Electrical Shock Hazard
● Failure to follow these instructions can
result in personal injury or death.
The installaon must conform with these instrucons and the local
code authority having jurisdicon and the requirements of the power
company. In the absence of local codes, the installaon must comply
with the current edions of the
National Electrical Code, NFPA 70
or the
Canadian Electrical Code CSA C22.1
.
An electrical ground is required to reduce risk of electrical shock or
possible electrocuon. The water heater should be connected to a
separate grounded branch circuit with over-current protecon and
disconnect switch. The water heater should be grounded in accordance
with naonal and local codes.
Voltage applied to the heater should not vary more than +5% to -10%
of the model and rang plate marking for sasfactory operaon.
DO NOT ENERGIZE THE BRANCH CIRCUIT FOR ANY REASON
BEFORE THE HEATER TANK IS FILLED WITH WATER. DOING
SO WILL CAUSE THE HEATING ELEMENTS TO BURN OUT AND
VOID WARRANTY.
The factory wiring is aached to a terminal block within the external
juncon box unit. The branch circuit is connected to the terminal block
within this juncon box. The water heater should be connected to a
separate, grounded, branch circuit with over-current protecon and
disconnect switch. The water heater should be grounded in accordance
with naonal and local codes.
Branch Circuit
The branch circuit wire size should be established through reference
to the current edion of
NFPA-70
, the
National Electrical Code
or other
locally approved source in conjuncon with the heater amperage
rang. For convenience, porons of the wire size tables from the
Code are reproduced here. The branch circuit should be sized at 125
percent of the heater rang and further increase wire size as necessary
to compensate for voltage drop in long runs.
Calculating Amperage/Over-current Protection
The heaters come from the factory in the following conguraon:
Four-wire, A-8 circuit for dual element heater equipped with two
high-limit controls and single-phase power input.
See
Wiring Diagrams
(page 25).
This is an example of calculang heater amperage for simultaneous
element operaon. From this, the branch circuit conductor and over-
current protecon sizing can be established.
The example is of a 277-volt unit with two, 6.1 kW elements. Check the
heater model and rang plate for actual specicaons and substute
those values in the following.
Table 3. Example: Single Phase Simultaneous A-8 Circuit
12,200 was ÷ 277 volts = 44 amps
The rang of the over-current protecon should be computed on the
basis of 125 percent of the total connected load amperage. Where the
standard rangs and sengs do not correspond with this computaon,
the next higher standard rang or seng should be selected.
Portion of Table 310-16 (NFPA-70) follows:
Allowable Ampacies of Insulated Copper Conductors. Not more
than three conductors in Raceway or Cable or Direct Burial (Based on
Ambient Temperature of 30° C, 86° F).
These ampacies relate only to conductors described in
Table 310-13
in Code
.
For ambient temperatures over 30° C (86° F), see
Correction Factors,
Note 13 in Code
.
Poron of Table 310-16 (NFPA-70)
Size
Temperature Rang of Conductor
See Table 310-13 in Code
AMG
MCM
60°C
(140°F)
75°C
(167°F)
Types:
RUW, (14-2), T, TW, UF
Types:
RH, RHW, RUH, (14-2), THW,
THWN, XHHW, USE
18
16
14
- - -
- - -
15
- - -
- - -
15
12
10
8
20
30
40
20
30
45
6
4
3
55
70
80
65
85
100
Water Heater Installaon
Light Service Commercial Electric Water Heaters • 15
Portion of Table 310-18 follows:
Allowable Ampacities of Insulated Aluminum and Copper -Clad
Aluminum Conductors.
Not more than three conductors in Raceway or Cable or Direct Burial
(Based on Ambient Temperature of 30° C, 86° F. These ampacies
relate only to conductors described in
Table 310-13
in
Code
.
For ambient temperatures over 30° C (86° F), see C
orrection Factors,
Note 13
in
Code
.
Poron of Table 310-18 (NFPA-70)
Size
Temperature Rang of Conductor
See Table 310-13 in Code
AMG
MCM
60°C
(140°F)
75°C
(167°F)
Types:
RUW, (14-2), T, TW, UF
Types:
RH, RHW, RUH, (14-2), THW,
THWN, XHHW, USE
12
10
15
25
15
25
8
6
30
40
40
50
4
3
55
65
65
75
2
1
75
85
90
100
16 • Light Service Commercial Electric Water Heaters
START UP
See
Features and Components
(page 9) for the location of
components menoned in the instrucons that follow.
NEVER
turn on power to the water heater without being certain the
water heater is lled with water and a temperature and pressure relief
valve is installed in the relief valve opening.
DO NOT TEST ELECTRICAL SYSTEM BEFORE HEATER IS
FILLED WITH WATER. FOLLOW FILLING AND START-UP
INSTRUCTIONS IN OPERATION SECTION.
● Before removing any access panels or
servicing the water heater, make sure
the the electrical supply to the water
heater is turned OFF.
Electrical Shock Hazard
● Failure to follow these instructions can
result in personal injury or death.
FILLING THE WATER HEATER
Property Damage Hazard
To avoid water heater damage, fill tank with water
before operating.
CAUTION
1. Turn o the electrical disconnect switch.
2. Close the water heater drain valve.
3. Open a nearby hot water faucet to permit the air in the system
to escape.
4. Fully open the cold water inlet pipe valve allowing the heater and
piping to be lled.
5. Close the hot water faucet as water starts to ow. The heater is
now ready for
Start Up
(page 16) and
Temperature Regulation
(page 17).
INITIAL START UP
The following checks should be made by the installer when the heater
is placed into operaon for the rst me.
1. Turn o the electrical disconnect switch.
2. Open the front panel or top access cover, check all water and
electrical connecons for ghtness. Also check connecons on
top and or sides of heater. Repair water leaks and ghten electrical
connecons as necessary.
3. Press the red manual reset button on each Thermostat/ECO
combinaon control. See
Figure 6
(page 21).
4. Turn on the electrical disconnect switch.
5. Observe the operaon of the electrical components during the
rst heang cycle. Use care as the electrical circuits are energized.
6. Close the front panel or top access cover.
Temperature control and contactor operaon should be checked by
allowing heater to come up to temperature and shut o automacally.
Use care as the electrical circuits are energized.
DRAINING THE WATER HEATER
The water heater must be drained if it is to be shut down and exposed
to freezing temperatures. Maintenance and service procedures may
also require draining the heater.
1. Turn o the electrical disconnect switch.
2. Open a hot water valve unl the water is cool, then close the supply
water inlet valve to heater.
3. Aach hose to outlet opening of drain valve and direct end to drain.
4. Open a nearby hot water faucet and the heater drain valve.
5. If the heater is being drained for an extended shutdown, it is
suggested the drain valve be le open during this period. The hose
may be removed.
Follow the procedure in
Filling the Water Heater
(page 16)
when
restoring hot water service.
⚠
DANGER
Burn Hazard
The discharge water from the drain valve is hot enough
to cause burns.
Keep your hands clear of the drain valve discharge
outlet.
Light Service Commercial Electric Water Heaters • 17
TEMPERATURE REGULATION
LIMITING THE RISK OF SCALDING
For a variety of reasons, water heaters can produce water that is much
hoer than its temperature seng. Take precauons to prevent this
higher temperature water from reaching the water xtures.
Burn Hazard
To reduce the risk of unusually hot
water reaching the fixtures in the
house, install thermostatic mixing
valves at each point of use.
A properly adjusted thermostac mixing valve at each point of use
allows you to set the tank temperature to a higher seng without
increasing risk of scalds. A higher temperature seng allows the
tank to provide much more hot water and can help provide proper
water temperatures for appliances such as dishwashers and washing
machines.
Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or shower-
ing.
Temperature limiting devices such as
thermostatic point-of-use mixing
valves must be installed when
required by codes and to ensure safe
temperatures at fixtures.
THE WATER HEATER IS EQUIPPED WITH AN ADJUSTABLE
THERMOSTAT TO CONTROL WATER TEMPERATURE. HOT
WATER AT TEMPERATURES DESIRED FOR AUTOMATIC
DISHWASHER AND LAUNDRY USE CAN CAUSE SCALDS
RESULTING IN SERIOUS PERSONAL INJURY AND/OR DEATH.
THE TEMPERATURE AT WHICH INJURY OCCURS VARIES
WITH THE PERSON’S AGE AND TIME OF EXPOSURE. THE
SLOWER RESPONSE TIME OF CHILDREN , AGED OR DISABLED
PERSONS INCREASES THE HAZARD TO THEM. NEVER
ALLOW SMALL CHILDREN TO USE A HOT WATER TAP, OR TO
DRAW THEIR OWN BATH WATER. NEVER LEAVE A CHILD OR
DISABLED PERSON UNATTENDED IN A BATHTUB OR SHOWER.
It is recommended that lower water temperatures be used to avoid
the risk of scalding. It is further recommended, in all cases, that the
water temperature thermostats be set for the lowest temperature
which sases your hot water needs. This will also provide the most
energy ecient operaon of the water heater. See
Table 4
The temperature of the water in the water
heater can exceed the thermostat se�ng and
be hot enough to cause burns.
If you choose a higher temperature se�ng,
install thermosta�c mixing valves at each
point-of-use to help avoid scalding.
⚠
WARNING
Burn Hazard
Table 4
shows the approximate time-to-burn relationship for
normal adult skin. The thermostats on your water heater have a
linear relationship between degrees of angular rotation and the
corresponding change in temperature. Thus rotang the temperature
adjustment indicator 30 angular degrees will result in a 10°F change
in water temperature.
Table 4. Burn Time at Various Temperatures
Water Temperature
°F (°C)
Time for 1st Degree Burn
(Less Severe Burns)
Time for Permanent Burns
2nd & 3rd Degree
(Most Severe Burns)
110 (43) (normal shower temp.)
116 (47) (pain threshold)
116 (47) 35 minutes 45 minutes
122 (50) 1 minute 5 minutes
131 (55) 5 seconds 25 seconds
140 (60) 2 seconds 5 seconds
149 (65) 1 second 2 seconds
154 (68) instantaneous 1 second
(U.S. Government Memorandum, C.P.S.C., Peter L. Armstrong, Sept. 15, 1978)
Burn Hazard
To reduce the risk of unusually hot
water reaching the fixtures in the
house, install thermostatic mixing
valves at each point of use.
TEMPERATURE ADJUSTMENT
The thermostats are adjustable from approximately 120°F (49°C)
(lowest seng) to 181°F (83°C) (highest seng). See
Figure 3
). These
thermostats are set from the factory at approximately the 140°F (60°C)
seng. The over temperature device (ECO high limit) aached to each
thermostat has a manual reset.
18 • Light Service Commercial Electric Water Heaters
Temperature Regulaon
LOWER THERMOSTAT
UPPER THERMOSTAT
Figure 3. Thermostat Controls
Note:
It is not necessary to adjust the upper thermostat for a dual
element unit. However, if it is adjusted above the factory set
point 140°F (60°C) it is recommended that it not be set higher
than the lower thermostat seng.
To change the temperature seng:
● Before removing any access panels or
servicing the water heater, make sure
the the electrical supply to the water
heater is turned OFF.
Electrical Shock Hazard
● Failure to follow these instructions can
result in personal injury or death.
1.
DANGER:
Turn o the heater electrical supply. Do not aempt to
adjust thermostat with power on.
2. Remove the upper and/or lower element access panel. Do not
remove the plasc personnel protectors covering the thermostats.
The thermostat is factory pre-set at 140°F (60°C).
3. Using a at p screwdriver, rotate the adjusng knob to the desired
temperature seng.
4. Replace the access panels, and turn on heater electrical supply.
The temperature of the water in the water
heater can exceed the thermostat se�ng and
be hot enough to cause burns.
If you choose a higher temperature se�ng,
install thermosta�c mixing valves at each
point-of-use to help avoid scalding.
⚠
WARNING
Burn Hazard
Light Service Commercial Electric Water Heaters • 19
MAINTENANCE
Table 5. Maintenance Schedule
Component Operaon Interval Reference
Tank Drain and Flush Every 6 Months See
Draining and Flushing
Tank
Lime Scale Removal
(Water Less Than 25
Grains Hard)
Not Required N/A
Tank
Lime Scale Removal
(Water Greater Than
25 Grains Hard)
Annually See
Lime Scale Removal
.
Moving Parts Lubricaon Not Required N/A
Powered
Anodes
Inspecon/
Cleaning
Annually
See
Anode Rod Maintenance
(page 20)
T&P Valve Test Operaon Semi Annually
See
Temperature-Pressure
Relief Valve Test
(page 21).
Burn hazard.
Hot water discharge.
Keep clear of the Relief Valve
discharge outlet.
Periodically the drain valve should be opened and the water allowed
to run unl it ows clean. This will help to prevent sediment buildup
in the tank boom.
Periodically check the temperature and pressure relief valve to ensure
that it is in operang condion. Li the lever at the top of the valve
several mes unl the valve seats properly and operates freely.
Water heater maintenance includes periodic tank ushing and cleaning,
and removal of lime scale from the heang element.
The heater tank is equipped with an anode rod to aid in corrosion
control.
DRAINING AND FLUSHING
It is recommended that the water heater storage tank be drained and
ushed every 6 months to reduce sediment buildup. The water heater
should be drained if being shut down during freezing temperatures. See
Figure 1
(page 9) for the locaon of the water heater components
described below.
⚠
DANGER
Burn Hazard
The discharge water from the drain valve is hot enough
to cause burns.
Keep your hands clear of the drain valve discharge
outlet.
Draining the Water Heater Storage Tank
1. Turn o the electrical supply to the water heater.
2. Ensure the cold water inlet valve is open.
3. Open a nearby hot water faucet and let the water run unl the
water is no longer hot.
4. Close the cold water inlet valve to the water heater.
5. Connect a hose to the water heater drain valve and terminate it to
an adequate drain.
6. Open the water heater drain valve and allow all the water to drain
from the storage tank.
7. Close the water heater drain valve when all water in the storage
tank has drained.
8. Close the hot water faucet opened in Step 3.
9. If the water heater is going to be shut down for an extended period,
the drain valve should be le open.
Flushing the Water Heater Storage Tank
1. Turn o the electrical supply to the water heater.
2. Ensure the cold water inlet valve is open.
3. Open a nearby hot water faucet and let the water run unl the
water is no longer hot. Then close the hot water faucet.
4. Connect a hose to the drain valve and terminate it to an adequate
drain.
5. Ensure the drain hose is secured before and during the enre
flushing procedure. Flushing is performed with system water
pressure applied to the water heater.
6. Open the water heater drain valve to ush the storage tank.
7. Flush the water heater storage tank to remove sediment and allow
the water to ow unl it runs clean.
8. Close the water heater drain valve when ushing is completed.
9. Remove the drain hose.
10. Fill the water heater. See
Filling the Water Heater
(page 16).
11. Turn on the electrical supply to place the water heater back in
operaon.
12. Allow the water heater to complete several heang cycles to ensure
it is operang properly.
LIME SCALE REMOVAL
When water is heated, dissolved minerals in the water such as calcium
and magnesium carbonate (lime scale) become less soluble. As the
water temperature rises these minerals will precipitate or “fall out”
of soluon.
The amount of lime scale released from water is in direct proporon
to water temperature and usage. The higher the water temperature
or water usage, the more lime deposits are dropped out of the water.
Water hardness also affects lime scale accumulation. With the
temperature and usage being the same, hard water will release more
lime scale than soer water.
Lime scale reduces heang eciency as it accumulates inside a water
heater. Heang transfer surfaces become coated with lime scale
deposits which increases fuel costs to operate the water heater. Lime
scale deposits can also cause rumbling and pounding noises as air
20 • Light Service Commercial Electric Water Heaters
Maintenance
molecules trapped in the lime scale escape when heated. Lime scale
accumulaon also reduces the life span of water heaters. For these
reasons a regular schedule for deliming should be set up.
Chemical Lime Scale Removal
To dissolve and remove more stubborn lime scale deposits, UN-LIME
®
Professional Delimer should be used.
UN-LIME
®
Professional Delimer is an easy to handle patented food
grade acid formulated specically for lime scale removal from all types
of water using equipment. Hydrochloric base acids must not be used
to delime the water heaters covered in this manual.
Follow the instrucons on the UN-LIME
®
to delime the water heater.
Note:
Contact Technical Support for assistance in ordering the UN-
LIME
®
Professional Delimer.
⚠
DANGER
Burn Hazard
The discharge water from the drain valve is hot enough
to cause burns.
Keep your hands clear of the drain valve discharge
outlet.
Periodically the drain valve should be opened and the water allowed
to run unl it ows clean. This will help to prevent sediment buildup
in the tank boom.
Periodically check the temperature and pressure relief valve to ensure
that it is in operang condion. Li the lever at the top of the valve
several mes unl the valve seats properly and operates freely.
Water heater maintenance includes periodic tank ushing and cleaning,
and removal of lime scale from the heang element.
The heater tank is equipped with an anode rod to aid in corrosion
control.
ANODE ROD MAINTENANCE
CAUTION
Property Damage Hazard
Operating the water heater with depleted or
malfunctioning anodes can damage the water
heater.
Annual inspection and replacement of the anode
rod is required.
The anode rod is used to protect the tank from corrosion. Most hot
water tanks are equipped with an anode rod. The submerged rod
sacrices itself to protect the tank. Instead of corroding tank, water
ions aack and eat away the anode rod. This does not aect water’s
taste or color. The rod must be maintained to keep tank in operang
condion.
Anode deterioraon depends on water conducvity, not necessarily
water condion. A corroded or pied anode rod indicates high water
conducvity and should be checked and/or replaced more oen than
an anode rod that appears to be intact. Replacement of a depleted
anode rod can extend the life of your water heater. Inspecon should
be conducted by a qualied technician, and at a minimum should be
checked annually.
Arcially soened water is exceedingly corrosive because the process
substutes sodium ions for magnesium and calcium ions.
The use of a water soener may decrease the life of the water heater
tank.
The following are typical (but not all) signs of a depleted anode rod:
• The majority of the rods diameter is less than 3/8”.
• Signicant secons of the support wire (approx. 1/3 or more of
the anode rod’s length) are visible.
New Anode Rod
Partially Consumed Anode Rod
Depleted Anode Rod
Figure 4. Anode Depletion
If the anode rod show signs of either or both it should be replaced.
Note:
Whether re-installing or replacing the anode rod, check for any
leaks and immediately correct if found.
1. Turn o the electrical disconnect switch.
2. Shut o the water supply and open a nearby hot water faucet to
depressurize the water tank.
3. Drain approximately 5 gallons of water from tank. See
Draining
and Flushing
(page 19) for proper procedures. Close drain valve.
Anode
Figure 5. Accessing the Anode
4. Use a socket wrench to unscrew an remove the anode rod and
inspect the rod.
Check the rod for damage or depleon.
Maintenance
Light Service Commercial Electric Water Heaters • 21
If the rod is depleted, obtain a new rod and apply Teon
®
tape or
approved pipe sealant on threads to ensure there is no leakage.
5. Install the new rod or reinstall the exisng rod.
6. Rell the tank. See
Filling the Water Heater
(page 16)
7. Turn on the electrical power supply and restart the water heater
See
Start Up
(page 16).
TEMPERATURE-PRESSURE RELIEF VALVE TEST
⚠
DANGER
Burn Hazard
The discharge water from the temperature-pressure
relief valve is hot enough to cause burns.
Keep clear of the temperature-pressure relief valve
discharge outlet.
It is recommended that the Temperature-Pressure Relief Valve should
be checked to ensure that it is in operang condion every 6 months.
When checking the Temperature-Pressure Relief Valve operaon,
make sure that (1) no one is in front of or around the outlet of the
Temperature-Pressure Relief Valve discharge line, and (2) that the
water discharge will not cause any property damage, as water may be
extremely hot. Use care when operang valve as the valve may be hot.
To check the temperature-pressure relief valve, li the lever at the end
of the valve several mes. See
Figure 6
(page 21). The valve should
seat properly and operate freely.
If aer manually operang the valve, it fails to completely reset and
connues to release water, immediately close the cold water inlet to
the water heater and drain the water heater. See
Draining and Flushing
(page 19). Replace the Temperature-Pressure Relief Valve with a
properly rated/sized new one. See
Temperature-Pressure Relief Valve
(page 13) for instrucons on replacement.
Figure 6. Testing the Temperature-Pressure Relief Valve
If the Temperature-Pressure Relief Valve on the water heater weeps or
discharges periodically, this may be due to thermal expansion.
Note:
Excessive water pressure is the most common cause of
Temperature-Pressure Relief Valve leakage. Excessive water
system pressure is most oen caused by “thermal expansion”
in a “closed system.” See
Closed Water Systems
(page 13)
and
Thermal Expansion
(page 14). The Temperature-Pressure
Relief Valve is not intended for the constant relief of thermal
expansion.
Temperature-Pressure Relief Valve leakage due to pressure build up in
a closed system that does not have a thermal expansion tank installed
is not covered under the limited warranty. Thermal expansion tanks
must be installed on all closed water systems.
DO NOT PLUG THE TEMPERATURE-PRESSURE RELIEF VALVE
OPENING. THIS CAN CAUSE PROPERTY DAMAGE, SERIOUS
INJURY OR DEATH.
• Temperature-Pressure Relief Valve
must comply with ANSI Z21.22-CSA
4.4 and ASME code.
• Properly sized temperature-pressure
relief valve must be installed in
opening provided.
• Can result in overheating and
excessive tank pressure.
• Can cause serious injury or death.
⚠
WARNING
Explosion Hazard
22 • Light Service Commercial Electric Water Heaters
Maintenance
REPAIR PARTS LIST
Now that you have purchased this water heater, should a need ever
exist for repair parts or service, simply contact the company it was
purchased from or direct from the manufacturer listed on the rang
plate on the water heater.
Selling prices will be furnished on request or parts will be shipped at
prevailing prices and you will be billed accordingly.
The model number of your Water Heater will be found on the rang
plated located above the lower access panel.
Be sure to provide all pernent facts when you call or visit.
WHEN ORDERING REPAIR PARTS, ALWAYS GIVE THE
FOLLOWING INFORMATION:
• Model Number
• Voltage And Element Waage
• Serial Number
• Part Descripon
Table 6. Repair Parts List
Key No. Part Descripon
1 Extension Nipple
2 Combo Dip Tube
3 Primary Anode Rod
4 T&P Valve
5 Element Gasket
6 Upper Element
7 Thermostat Bracket
8 Upper Thermostat w/Hi Limit
9 Terminal Protector
10 Upper Access Panel
11 Lower Access Panel
12 Lower Thermostat w/Hi Limit
13 Lower Element
14 Brass Drain Valve
15 Drain Pan
1
2
3
4
5
6
7
8
9
10
12
13
15
11
14
Figure 7. Repair Parts
Light Service Commercial Electric Water Heaters • 23
TROUBLESHOOTING CHECKLIST
CHECKLIST
Before calling for service, check the following points to see if the cause
of trouble can be idened and corrected.
Reviewing this checklist may eliminate the need of a service call and
quickly restore hot water service. See
Figure 1
(page 9) in this
manual to idenfy and locate water heater components.
● Before removing any access panels or
servicing the water heater, make sure
the the electrical supply to the water
heater is turned OFF.
Electrical Shock Hazard
● Failure to follow these instructions can
result in personal injury or death.
Not enough or no hot water
1. Be certain the electrical disconnect switch serving the water heater
is in the ON posion.
2. Check the fuses.
• The electrical disconnect switch usually contains fuses.
3. If the water was excessively hot, and is now cold, the high limit
switch may have acvated.
• See the
Temperature Regulation
(page 17) for more
informaon on how to reset the ECO high limit controls.
4. The capacity of the heater may have been exceeded by a large
demand for hot water.
• Large demands require a recovery period to restore water
temperature.
5. Cooler incoming water temperature will lengthen the me required
to heat water to the desired temperature.
6. Look for hot water leakage.
7. Sediment or pipe scale may be aecng water heater operaon.
ABNORMAL SOUNDS
8. Sediment or lime scale accumulaons on the elements causes
sizzling and hissing noises when the heater is operang.
• The sounds are normal, however, the tank boom and
elements should be cleaned. See
Maintenance
(page 19).
Water leakage is suspected
See
Checking for Leaks
(page 24).
9. Check to see if the heater drain valve is ghtly closed.
10. If the outlet of the relief valve is leaking it may represent:
• Excessive water temperature.
• Faulty relief valve.
• Excessive water pressure.
11. Excessive water pressure is the most common cause of relief valve
leakage. It is oen caused by a “closed system”. See
Closed Water
Systems
(page 13) and
Thermal Expansion
(page 14) for more
informaon.
12. Examine the area around the element for gasket leakage.
• Tighten the elements or, if necessary, follow the procedure in
Lime Scale Removal
(page 19) to replace the gaskets.
IF YOU CANNOT IDENTIFY OR CORRECT THE SOURCE OF MALFUNCTION
1. Turn the power supply to the water heater o.
2. Close the supply water inlet valve to the heater.
3. Contact a Qualied Service Agency in your area. Call the toll free
phone number on the back cover of this Instrucon Manual for
assistance in locang a service agency in your area.
REPLACEMENT PARTS
Call the toll free phone number on the back cover of this Instrucon
Manual for assistance in locang replacement parts.. When ordering
parts, specify complete model no., serial no., (see rating plate),
quanty and name of part desired. Standard hardware items should
be purchased locally.
24 • Light Service Commercial Electric Water Heaters
Troubleshoong Checklist
CHECKING FOR LEAKS
Use this illustraon as a guide when checking for sources of water leakage. You or your dealer may be able to correct what appears to be a
problem.
Note:
Cover and insulaon are show removed to reveal tank top.
All water which appears at the water heater boom or on the surrounding oor may be caused by condensaon, loose connecons or relief
valve operaon and leakage. Do not replace the water heater unl full inspecon of all potenal leak points is made and correcve steps taken
to stop the leak.
Leakage from other appliances, water lines or ground should also be suspected unl proven otherwise. See
Water leakage is suspected
(page 23).
6
10
1
4
5
7
6
7
8
8
9
3
2
L1 L3
L4
T2 T4
L2
T1
THERM O DISC
89T
RESET
RESET
181°F
120°F
140°F
L1 L3
L4
T2 T4
L2
T1
THERM O DISC
89T
RESET
RESET
181°F
120°F
140°F
Figure 8. Leakage Checkpoints
Read and understand this instruction
manual and the safety messages
herein before installing, operating or
servicing this water heater.
Failure to follow these instructions and
safety messages could result in death
or serious injury.
This manual must remain with the
water heater.
Never use this water heater unless it is completely lled with water. To
prevent damage to the tank, the tank must be lled with water. Water
must ow from the hot water faucet before turning the water heater.
1. Where possible remove or li top cover to examine threads of
ngs installed into tank for evidence of leakage. Correct ng
leaks as necessary.
2. *The anode rod ng may be leaking.
3. *Condensaon might be seen on pipes in humid weather or pipe
connecons may be leaking.
4. *The temperature-pressure relief valve might be leaking at the
tank ng.
5. Small amounts of water from temperature-pressure relief valve
might be due to thermal expansion or high water pressure in your
area.
6. Water on the side of the tank might be condensaon due to the
panel or insulaon not being in place.
7. Defecve element which leaks at terminals or thru ange. Replace
element*
8. Loose element/gasket leak
1) Screw-in type: tighten with 1-1/2” socket wrench. If leak
connues, remove element*, discard gasket and clean thread
areas. Apply non-hardening Permatex Number 2 to thread areas,
install new gasket and screw element into ng unl it seats.
Tighten 1/2 to 3/4 turn with wrench.
2) Flange type: tighten screw with wrench. If leak continues
remove element* and discard gasket. Clean gasket seang areas
and re-install element with new gasket. A new element may
be required where threads have become rusted or damaged,
prevenng ghtening.
9. Water from a drain valve might be due to the valve being slightly
opened.
10. *The drain valve might be leaking at the tank ng.
Leakage from other water heaters, water lines, or ground seepage
should also be checked.
* To check where threaded poron enters tank, insert coon swab between
jacket opening and ng. If coon is wet, follow the procedure in
Draining
the Water Heater Storage Tank
(page 19) and then remove ng. Put pipe
dope or teon tape on the threads and replace. Then follow the procedure
in
Filling the Water Heater
(page 16).
*Contact your dealer as it is necessary to shut o electricity and drain
tank to perform procedure.
Light Service Commercial Electric Water Heaters • 25
WIRING DIAGRAMS
1 3
1
2 4
2
L1
J
L2
L3
YELLOW
GREEN
GND
BLACK
FACTORY PRE-WIRED
BLACK
1 3
1
2 4
4
2
RED
RED
BLACK
RED
RED
HIGH LIMIT
DOUBLE-THROW
THERMOSTAT
YELLOW
YELLOW
BLUE
BLUE
RED
BLACK
BLACK
BLACK
BLACK
HIGH LIMIT
SINGLE-THROW
THERMOSTAT
RED
UPPER ELEMENT
LOWER ELEMENT
Figure 9. Wiring Diagram
26 • Light Service Commercial Electric Water Heaters
NOTES
Light Service Commercial Electric Water Heaters • 27
NOTES
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