Water Heaters
Electric Residential
The purpose of this manual is twofold: one, to
provide the installer with the basic directions
and recommendations for the proper
installation and adjustment of the water heater;
and two, for the owner–operator, to explain the
features, operation, safety precautions,
maintenance and troubleshooting of the water
heater. This manual also includes a parts list.
It is imperative that all persons who are
expected to install, operate or adjust this water
heater read the instructions carefully so they
may understand how to perform these
operations. If you do not understand these
instructions or any terms within it, seek
professional advice.
Any questions regarding the operation,
maintenance, service or warranty of this water
heater should be directed to the seller from
whom it was purchased. If additional
information is required, refer to the section on
“If you need service.”
Do not destroy this manual. Please read
carefully and keep in a safe place for future
reference.
Recognize this symbol as an
indication of Important Safety
Information!
California Proposition 65 Warning:
This product contains chemicals known
to the State of California to cause
cancer, birth defects or other
reproductive harm.
!
!
Single and Double Element Models,
Residential 20–120 Gallon
®
LISTED
786H
AP9029-9 (01/05)
Printed in USA
Use & Care Manual
With Installation Instructions for the Installer
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Safety Information
Safety Precautions. . . . . . . 3, 4
Installation Instructions
Location . . . . . . . . . . . . . . . . . 5
Water Connections . . . . . . . . 6
Electrical Connections . . . . . 8
Operating Instructions
Safety Controls . . . . . . . . . . 12
Water Temperature . . . . . . . . 13
Care and Cleaning
Draining . . . . . . . . . . . . . . . . 14
Maintenance. . . . . . . . . . . . . 14
Extended Shut-Down . . . . . 15
Troubleshooting Tips
Before You Call
For Service. . . . . . . . . . . . . . 16
Customer Service
Parts List . . . . . . . . . . . . . . . 17
If You Need
Service . . . . . . . . . . . . . . . . . 19
Wiring Diagram . . . . . . . . . 20
2
Inside you will find many helpful hints on how to use and
maintain your water heater properly. Just a little preventive care
on your part can save you a great deal of time and money over
the life of your water heater.
You’ll find many answers to common problems in the Before You
Call For Service section. If you review our chart of
Troubleshooting Tips first, you may not need to call for service at
all.
READ THIS MANUAL
FOR YOUR RECORDS
Write the model and serial numbers here:
#
#
You can find them on a label on the appliance.
Staple sales slip or cancelled check here.
Proof of the original purchase date is needed to obtain service
under the warranty.
Your safety and the safety of others are very important. There
are many important safety messages in this manual and on
your appliance. Always read and obey all safety messages.
This is the safety alert symbol. Recognize this symbol
as an indication of Important Safety Information!
This symbol alerts you to potential hazards that can
kill or hurt you and others.
All safety messages will follow the safety alert symbol and
either the word “DANGER”, “WARNING”, “CAUTION” or
“NOTICE”.
These words mean:
DANGER
An imminently hazardous situation
that will result in death or serious
injury.
WARNING
A potentially hazardous situation that
could result in death or serious injury
and/or damage to property.
CAUTION
A potentially hazardous situation that
may result in minor or moderate
injury.
Notice:
Attention is called to observe a
specified procedure or maintain
a specific condition.
!
!
!
!
READ THE SAFETY INFORMATION
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Time/Temperature Relationship in Scalds
Temperature
Time To Produce a Serious Burn
120°F
More than 5 minutes
125°F
1½ to 2 minutes
130°F
About 30 seconds
135°F
About 10 seconds
140°F
Less than 5 seconds
145°F
Less than 3 seconds
150°F
About 1½ seconds
155°F
About 1 second
Table courtesy of Shriners Burn Institute
The chart shown above may be used as a guide
in determining the proper water temperature for your
home.
DANGER: Households with small children, disabled,
or elderly persons may require a 120°F or lower thermostat
setting to prevent contact with “HOT” water.
The temperature of the water in the heater is
regulated by the adjustable surface mounted
thermostat(s) located behind the jacket access
panel(s). Dual element heaters have two thermostats.
To comply with safety regulations the thermostat(s)
were set at 120°F before the water heater was
shipped from the factory.
The illustration at the left
shows the temperature
adjustment dial used for
setting the water
temperature.
Refer to the Operating
Instructions in this
manual for detailed
instructions in how to
adjust the thermostat(s).
DANGER: Hotter water increases the potential for
Hot Water SCALDS.
!
!
D A N G E R
!
HOT
Water temperature over 125°F can
cause severe burns instantly or
death from scalds.
Children, disabled and elderly are
at highest risk of being scalded.
See instruction manual before
setting temperature at water
heater.
Feel water before bathing or
showering.
Temperature limiting valves are
available, see manual.
BURN
R
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S
E
T
R
E
S
E
T
TURN OFF
POWER
BEFORE
SERVICING
90°F
150°F
125°F
(66°C)
(52°C)
(32°C)
IMPORTANT SAFETY INFORMATION.
READ ALL INSTRUCTIONS BEFORE USING.
3
Reset button
Thermostat
protective
cover
Thermostat dial
pointer
DANGER!
WATER TEMPERATURE SETTING
Safety and energy conservation are factors to be considered when selecting the water
temperature setting of water heater’s thermostat. Water temperatures above 125°F can
cause severe burns or death from scalding. Be sure to read and follow the warnings
outlined on the label pictured below. This label is also located on the water heater near
the thermostat access panel.
NOTICE: Mixing valves are available for reducing point
of use water temperature by mixing hot and cold water in
branch water lines. Contact a licensed plumber or the
local plumbing authority for further information.
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4
IMPORTANT SAFETY INFORMATION.
READ ALL INSTRUCTIONS BEFORE USING.
WARNING!
For your safety, the information in this manual must be followed to minimize the risk of
fire or explosion, electric shock, or to prevent property damage, personal injury, or loss of
life.
Be sure to read and understand the entire Use and Care Manual before attempting to
install or operate this water heater. It may save you time and cost. Pay particular
attention to the Safety Instructions. Failure to follow these warnings could result in
serious bodily injury or death. Should you have problems understanding the instructions
in this manual, or have any questions, STOP, and get help from a qualified service
technician, or the local electric utility.
FOR INSTALLATIONS IN THE STATE OF CALIFORNIA
California Law requires that residential water heaters must be braced, anchored or
strapped to resist falling or horizontal displacement due to earthquake motions. For
residential water heaters up to 52 gallon capacity, a brochure with generic earthquake
bracing instructions can be obtained from: Office of the State Architect, 400 P Street,
Sacramento, CA 95814 or you may call 916-324-5315 or ask a water heater dealer.
However, applicable local codes shall govern installation. For residential water heaters
of a capacity greater than 52 gallons, consult the local building jurisdiction for acceptable
bracing procedures.
READ AND FOLLOW THIS SAFETY INFORMATION
CAREFULLY.
SAVE THESE INSTRUCTIONS
Have the installer show you the location of the circuit breaker and how to shut it off if
necessary. Turn off the circuit breaker if the water heater has been subjected to overheating,
fire, flood, physical damage or if the ECO fails to shut off.
● Read this manual entirely before installing
or operating the water heater.
● Use this appliance only for its intended
purpose as described in this Use and Care
Manual.
● Be sure your appliance is properly installed
in accordance with local codes and the
provided installation instructions.
● Do not attempt to repair or replace any part
of your water heater unless it is specifically
recommended in this manual. All other
servicing should be referred to a qualified
technician.
SAFETY PRECAUTIONS
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Installing the water heater.
The location chosen for the water heater must take into consideration the following:
Local Installation Regulations
This water heater must be installed in
accordance with these instructions, local
codes, utility codes, utility company
requirements or, in the absence of local
codes, the latest edition of the National
Electrical Code. It is available from some
local libraries or can be purchased from
the National Fire Protection Association,
Batterymarch park, Quincy, MA 02269 as
booklet ANSI/NFPA 70.
Location
Locate the water heater in a clean dry area
as near as practical to the area of greatest
heated water demand. Long uninsulated hot
water lines can waste energy and water.
Place the water heater in such a manner
that the thermostat and element access
panels can be removed to permit
inspection and servicing such as removal
of elements or checking controls.
The water heater and water lines should be
protected from freezing temperatures. Do
not install the water heater in outdoor,
unprotected areas.
Make certain the floor underneath the
water heater is strong enough to
sufficiently support the weight of the
water heater once it is filled with water.
CAUTION: The water heater should not
be located in an area where leakage of the
tank or connections will result in damage to
the area adjacent to it or to lower floors of
the structure. Where such areas cannot be
avoided, it is recommended that a suitable
catch pan, adequately drained, be installed
under the water heater.
!
A—Diameter of water
heater plus 2″ min.
B—Maximum 2″
NOTICE: Auxiliary catch pan MUST conform to local codes.
Catch Pan Kits are available from the store where the water heater was
purchased, or any water heater distributor.
B
A
To open drain, line should
be at least 3/4″ ID and
pitched for proper
drainage.
5
Inspect Shipment
Inspect the water heater for possible damage. Check the markings on the rating plate of
the water heater to be certain the power supply corresponds to the water heater
requirements.
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Installing the water heater.
6
Thermal Expansion
Typical Installation
Determine if a check valve exists in the inlet water line. Check with your local water
utility. It may have been installed in the cold water line as a separate back flow preventer, or it
may be part of a pressure reducing valve, water meter or water softener. A check valve located
in the cold water inlet line can cause what is referred to as a “closed water system”. A cold
water inlet line with no check valve or back flow prevention device is referred to as an “open”
water system.
As water is heated, it expands in volume and creates an increase in the pressure within the
water system. This action is referred to as “thermal expansion”. In an “open” water system,
expanding water which exceeds the capacity of the water heater flows back into the city main
where the pressure is easily dissipated.
A “closed water system”, however, prevents the expanding water from flowing back into the
main supply line, and the result of “thermal expansion” can create a rapid and dangerous
pressure increase in the water heater and system piping. This rapid pressure increase can
quickly reach the safety setting of the relief valve, causing it to operate during each heating
cycle. Thermal expansion, and the resulting rapid and repeated expansion and contraction of
components in the water heater and piping system can cause premature failure of the relief
valve, and possibly the heater itself. Replacing the relief valve will not correct the problem!
The suggested method of controlling thermal expansion is to install an expansion tank in the
cold water line between the water heater and the check valve (refer to the illustration below).
The expansion tank is designed with an air cushion built in that compresses as the system
pressure increases, thereby relieving the over pressure condition and eliminating the repeated
operation of the relief valve. Other methods of controlling thermal expansion are also available.
Contact your installing contractor, water supplier or plumbing inspector for additional
information regarding this subject.
NOTICE: Do not apply heat to
the HOT or COLD water
connections. If sweat
connections are used, sweat
tubing to adapter before fitting
adapter to the water
connections on heater. Any
heat applied to the water
supply fittings will
permanently damage the dip
tube and/or heat traps.
Water Supply Connections
Refer to the illustration below for suggested typical installation. The installation of unions or
flexible copper connectors is recommended on the hot and cold water connections so that the
water heater may be easily disconnected for servicing if necessary. The HOT and COLD
water connections are clearly marked and are 3/4″ NPT on all models. Install a shut-off valve
in the cold water line near the water heater.
R
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F
V
A
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E
COLD
HOT
Heat trap
6" minimum
Heat trap
6" minimum
6" air gap
Union
To electrical
distribution panel
Temperature
&
Pressure
Relief Valve
Anode
Union
Hot water outlet
to fixtures
Jacket access
panels
Drain valve
Auxiliary catch pan
2" maximum
Relief valve discharge line
to suitable open drain
Thermal
expansion tank
(if required)
Electrical junction box
(use only copper conductors)
To cold water
supply
Shut-off
valve
Vacuum Relief Valve
(Not Supplied)
If required, install per local codes
and valve manufacturer’s
instructions.
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WARNING: The pressure
rating of the relief valve must
not exceed 150 PSI, the
maximum working pressure of
the water heater as marked on
the rating plate.
!
A new combination temperature and pressure relief valve, complying with the Standard for Relief
Valves and Automatic Gas Shut-Off Devices for Hot Water Supply Systems, ANSI Z21.22, is supplied
and must be installed in the opening provided and marked for the purpose on the water heater. No
valve of any type should be installed between the relief valve and the tank. Local codes shall govern the
installation of relief valves.
Relief Valve
The BTUH rating of the relief valve must
not be less than the input rating of the
water heater as indicated on the rating
label located on the front of the heater
(1 watt=3.412 BTUH).
Connect the outlet of the relief valve
to a suitable open drain so that the
discharge water cannot contact live
electrical parts or persons and to eliminate
potential water damage.
Piping used should be of a type approved
for hot water distribution. The discharge
line must be no smaller than the outlet of
the valve and must pitch downward from
the valve to allow complete drainage (by
gravity) of the relief valve and discharge
line. The end of the discharge line should
not be threaded or concealed and should
be protected from freezing. No valve of
any type, restriction or reducer coupling
should be installed in the discharge line.
To Fill the Water Heater
Make certain the drain valve is completely
closed.
Open the shut-off valve in the cold water
supply line.
Open each hot water faucet slowly to
allow the air to vent from the water
heater and piping.
A steady flow of water from the hot water
faucet(s) indicates a full water heater.
7
WARNING: The tank must
be full of water before heater
is turned on. The water heater
warranty does not cover
damage or failure resulting
from operation with an empty
or partially empty tank.
!
Condensation
Condensation can form on the tank when
it is first filled with water. Condensation
might also occur with a heavy water draw
and very cold inlet water temperature.
This condition is not unusual, and will
disappear after the water becomes heated.
If, however, the condensation continues,
examine the piping and fittings for
possible leaks.
Additional information on this subject
may be found at www.rheem.com under
“Library”. Scroll down to the Technical
Service Bulletins 1300 Series Section and
choose Bulletin #1303.
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8
Installing the water heater.
NOTICE: This guide recommends minimum branch circuit sizing and wire size based on National Electric Code. Refer to
wiring diagrams in this manual for field wiring connections.
Branch Circuit Sizing and Wire Size Guide
Total Water
Recommended Over Current Protection
Copper Wire Size AWG Based
Heater Wattage
(fuse or circuit breaker amperage rating)
on N.E.C. Table 310-16 (75°C)
208V
240V
277V
480V
208V
240V
277V
480V
3,000
20
20
15
15
12
12
14
14
4,000
25
25
20
15
10
10
12
14
4,500
30
25
25
15
10
10
10
14
5,000
30
30
25
15
10
10
10
14
5,500
35
30
25
15
8
10
10
14
6,000
40
35
30
20
8
8
10
12
8,000
50
45
40
25
8
8
8
10
9,000
–
50
45
25
–
8
8
10
10,000
–
–
50
30
–
–
8
10
11,000
–
–
50
30
–
–
8
10
12,000
–
–
–
35
–
–
–
8
CAUTION: The presence of
water in the piping and water
heater does not provide
sufficient conduction for a
ground. Non-metallic piping,
dielectric unions, flexible
connectors etc. can cause the
water heater to be electrically
isolated.
!
Electrical Connections
A separate branch circuit with copper
conductors, overcurrent protective device
and suitable disconnecting means must be
provided by a qualified electrician.
All wiring must conform to local codes or
latest edition of National Electrical Code
ANSI/NFPA 70.
The water heater is completely wired to
the junction box inside jacket at the top
front of the water heater. An opening for
1/2″ or 3/4″ electrical fitting is provided
for field wiring connections.
The voltage requirements and wattage
load for the water heater are specified
on the rating plate on the front of the
water heater.
The branch circuit wiring should include
either:
Metallic conduit or metallic sheathed
cable approved for use as a
grounding conductor and installed
with fittings approved for the
purpose.
Non-metallic sheathed cable,
metallic conduit or metallic sheathed
cable not approved for use as a
ground conductor shall include a
separate conductor for grounding. It
should be attached to the ground
terminals of the water heater and the
electrical distribution box.
WARN
ING
Water heater junction box.
Ground screw
Junction
box cover
Wire connections
Conduit
connector
Total Water
Recommended Over Current Protection
Copper Wire Size AWG Based
Heater Wattage
(fuse or circuit breaker amperage rating)
on N.E.C. Table 310-16 (75°C)
208V
240V
277V
480V
208V
240V
277V
480V
3,000
20
20
–
15
12
12
–
14
4,000
25
25
–
15
10
10
–
14
4,500
30
25
–
15
10
10
–
14
5,000
30
30
–
15
10
10
–
14
5,500
35
30
–
15
8
10
–
14
6,000
35
30
–
15
8
10
–
14
8,000
45
40
–
20
8
8
–
12
9,000
50
45
–
25
8
8
–
10
10,000
–
50
–
25
–
8
–
10
11,000
–
50
–
25
–
8
–
10
12,000
–
–
–
30
–
–
–
10
Single Phase
Wiring
3 Phase
Wiring
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For increased energy efficiency, some
water heaters have been supplied with
two 24” sections of pipe insulation.
Please install the insulation, according to
the illustrations above, that best meets
your requirements.
R
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I
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F
V
A
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V
E
COLD
HOT
Typical vertical piping arrangement
R
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V
A
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V
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COLD
HOT
Typical horizontal piping arrangement
Hot and Cold Pipe Insulation Installation
Insulation blankets, available to the
general public, for external use on electric
water heaters are not necessary. The
purpose of an insulation blanket is to
reduce the standby heat loss encountered
with storage tank heaters. This water
heater meets or exceeds the National
Appliance Energy Conservation Act
standards with respect to insulation and
standby loss requirements making an
insulation blanket unnecessary.
The manufacturer’s warranty does not
cover any damage or defect caused by
installation, attachment or use of
any type of energy saving or other
unapproved devices (other than those
authorized by the manufacturer) into, onto
or in conjunction with the water heater.
The use of unauthorized energy saving
devices may shorten the life of the water
heater and may endanger life and property.
The manufacturer disclaims any
responsibility for such loss or injury
resulting from the use of such
unauthorized devices.
CAUTION: If local codes require the
application of an external insulation
blanket to this water heater, pay careful
attention to the following so as not to
restrict the proper function and
operation of the water heater:
 Do not cover the operating or warning
labels attached to the water heater or
attempt to relocate them on the exterior
of insulation blanket.
 Do not apply insulation to the top of the
water heater. This could interfere with
the safe operation of the electrical
junction box.
 Do not cover the jacket access panel(s)
to the thermostat(s) and heating
element(s), or pressure and temperature
relief valve.
 Inspect the insulation blanket frequently.
!
WARNING: If local
codes require external
application of insulation
blanket kits the
manufacturer’s instructions
included with the kit must
be carefully followed.
!
Insulation Blankets
9
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10
Installing the water heater.
For increased energy efficiency, some
water heaters have been supplied with
a 2-3/8” section of pipe insulation.
Please install the insulation, according to
the illustrations above, that best meets
your requirements.
Slip the insulation cover over the T&P
Valve through the center hole and align
the hole in the side with the opening of
the T&P Valve.
R
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COLD
HOT
Typical top connection arrangement
Typical side connection arrangement
Relief Valve Insulation Installation
CAUTION: Ensure the
T&P Valve opening is not
obstructed by the insulation.
!
Heat Trap
For increased energy efficiency, some
water heaters have been supplied with
factory installed internal or external heat
traps in the hot outlet and cold water inlet
openings.
NOTICE: Do not apply heat to the HOT or
COLD water connections. If sweat
connections are used, sweat tubing to
adapter before fitting adapter to the water
connections on heater. Any heat applied to
the water supply fittings will permanently
damage the dip tube and/or heat traps.
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Installation Checklist
11
A. Water Heater Location
B. Water Supply
C. Relief Valve
D. Wiring
❑ Close to area of heated water demand.
❑ Indoors and protected from freezing
temperatures.
❑ Area free of flammable vapors.
❑ Provisions made to protect area from water
damage.
❑ Sufficient room to service heater.
❑ Water heater completely filled with water.
❑ Air purged from water heater and piping.
❑ Water connections tight and free of leaks.
❑ Temperature and Pressure Relief Valve
properly installed and discharge line run to
open drain.
❑ Discharge line protected from freezing.
❑ Power Supply voltage agrees with water
heater rating plate.
❑ Branch circuit wire and fusing or circuit
breaker of proper size.
❑ Electrical connections tight and unit properly
grounded.
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12
Safety Precautions
Do turn off power to water heater if
it has been subjected to over heating,
fire, flood, physical damage.
Do Not turn on water heater unless it
is filled with water.
Do Not turn on water heater if cold
water supply shut-off valve is closed.
If there is any difficulty in
understanding or following the
Operating Instructions or the
Care and Cleaning section, it is
recommended that a qualified person
or serviceman perform the work.
Operating the water heater.
CAUTION: Hydrogen gas can be produced in a hot water system served by this water heater that has not been used for a
long period of time (generally two weeks or more). HYDROGEN GAS IS EXTREMELY FLAMMABLE!! To dissipate such
gas and to reduce risk of injury, 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 be an unusual sound
such as air escaping through the pipe as the water begins to flow. Do not smoke or use an open flame near the faucet at the
time it is open.
Safety Controls
The water heater is equipped with a
combination thermostat and temperature
limiting control (ECO) that is located
above the heating element in contact with
the tank surface. If for any reason the water
temperature becomes excessively high, the
temperature limiting control (ECO) breaks
the power circuit to the heating element.
Once the control opens, it must be reset
manually.
CAUTION: The cause of the high
temperature condition must be investigated
by qualified service technician and
corrective action must be taken before
placing the water heater in service again.
To reset the temperature limiting control:
Turn off the power to the water
heater.
Remove the jacket access panel(s)
and insulation.
The thermostat protective cover
should not be removed.
Press the red RESET button.
Replace the insulation and jacket
access panel(s) before turning on the
power to the water heater.
WARNING: If the water
heater has been subjected to
flood, fire, or physical damage,
turn off power and water to
the water heater.
Do not operate the water
heater again until it has
been thoroughly checked
by qualified service
personnel.
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13
If adjustment is necessary…
Turn off the power to the water
heater.
Remove the jacket access panel(s)
and insulation exposing the
thermostat(s).
The thermostat protective cover(s)
should not be removed.
Using a small screwdriver, set the
thermostat(s) dial pointer(s) to
the desired temperature.
Replace the insulation and jacket
access panel(s). Turn on the power to
the water heater.
R
E
S
E
T
R
E
S
E
T
TURN OFF
POWER
BEFORE
SERVICING
90°F
150°F
125°F
(66°C)
(52°C)
(32°C)
Type 59T thermostat and protective
cover.
Time/Temperature Relationship in Scalds
Temperature
Time To Produce a Serious Burn
120°F
More than 5 minutes
125°F
11/2 to 2 minutes
130°F
About 30 seconds
135°F
About 10 seconds
140°F
Less than 5 seconds
145°F
Less than 3 seconds
150°F
About 11/2 seconds
155°F
About 1 second
Table courtesy of Shriners Burn Institute
DANGER: There is a hot
water scald potential if the
thermostat is set too high.
Households with small
children, disabled, or elderly
persons may require a 120°F
or lower thermostat setting to
prevent contact with
HOT water.
!
Water Temperature Setting
The temperature of the water in the water
heater can be regulated by setting the
temperature dial of the adjustable surface
mounted thermostat(s) located behind the
jacket access panel(s).
Dual element heaters have two
thermostats.
Safety and energy conservation are factors
to be considered when selecting the water
temperature setting of the water heater’s
thermostat(s). The lower the temperature
setting, the greater the savings in energy
and operating costs.
To comply with safety regulations the
thermostat(s) are factory set at 120°F or
less where local codes require. This is the
recommended starting point.
Water temperatures above 125°F can
cause severe burns or death from scalding.
Be sure to read and follow the warnings
outlined in this manual and on the label on
the water heater. This label is located on
the water heater near the thermostat access
panel.
Mixing valves for reducing point of use
water temperature by mixing hot and cold
water in branch water lines are available.
Contact a licensed plumber or the local
plumbing authority for further
information.
The chart below may be used as a guide in
determining the proper water temperature
for your home.
Reset button
Thermostat
protective cover
Thermostat dial
pointer
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14
Routine Preventative Maintenance
Properly maintained, your water heater
will provide years of dependable trouble-
free service.
It is suggested that a routine preventive
maintenance program be established and
followed by the user.
It is further recommended that a periodic
inspection of the operating controls,
heating element and wiring should be
made by service personnel qualified in
electric appliance repair.
Most electrical appliances, even when
new, make some sound when in operation.
If the hissing or singing sound level
increases excessively, the electric heating
element may require cleaning. Contact a
qualified installer or plumbing contract to
inspect.
At least once a year, lift and release the
lever handle on the temperature pressure
relief valve, located near the top of the
water heater, to make certain the valve
operates freely. Allow several gallons to
flush through the discharge line to an open
drain.
A water heater’s tank can act as a setting
basin for solids suspended in the water.It
is therefore not uncommon for hard water
deposits to accumulate in the bottom of the
tank. It is suggested that a few quarts of
water be drained from the water heater’s
tank every month to clean the tank of
these deposits.
Rapid closing of faucets or solenoid
valves in automatic water using appliances
can cause a banging noise heard in a water
pipe. Strategically located risers in the
water pipe system or water hammer
arresting devices can be used to minimize
the problem.
The anode rod should be removed from the
water heater’s tank annually for inspection
and replaced when more than 6″ of core
wire is exposed at either end of the rod.
Make sure the cold water supply is turned
off before removing anode rod.
Care and cleaning of the water heater.
Draining the Water Heater
CAUTION: Shut off power to the water
heater before draining water.
DANGER: Before manually operating
the relief valve, make certain no one will be
exposed to the hot water released by the
valve. The water drained from the tank may
be hot enough to present a scald hazard and
should be directed to a suitable drain to
prevent injury or damage.
In order to drain the water heater, turn off
the cold water supply. Open a hot water
faucet or lift the handle on the relief valve
to admit air to the tank.
Attach a garden hose to the drain valve on
the water heater and direct the stream of
water to a drain. Open the valve.
DANGER: Before
manually operating the relief
valve, make certain no one will
be exposed to the danger of
coming in contact with the hot
water released by the valve.
The water may be hot enough
to create a scald hazard. The
water should be released into a
suitable drain to prevent
injury or property damage.
NOTICE: If the temperature
and pressure relief valve on
the hot water heater
discharges periodically, this
may be due to thermal
expansion in a closed water
system. Contact the water
supplier or your plumbing
contractor on how to correct
this. Do not plug the relief
valve outlet.
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Care and cleaning of the water heater.
15
Vacation and Extended Shut-Down
If the water heater is to remain idle for an
extended period of time, the power and
water to the appliance should be turned off
to conserve energy and prevent a build-up
of dangerous hydrogen gas.
The water heater and piping should be
drained if they might be subjected to
freezing temperatures.
After a long shut-down period, the water
heater’s operation and controls should be
checked by qualified service personnel.
Make certain the water heater is
completely filled again before placing
it in operation.
NOTICE: Refer to the
Hydrogen Gas Caution in the
Operating Instructions.
Anode Rod
This water heater is equipped with an
anode rod designed to prolong the life of
the glass lined tank. The anode rod is
slowly consumed, thereby eliminating or
minimizing corrosion of the glass lined
tank.
Water sometimes contains a high sulfate
and/or mineral content and together with
cathodic protection process can produce a
hydrogen sulfide, or rotten egg odor in the
heated water. Chlorination of the water
supply should minimize the problem.
NOTICE: Do not remove
the anode rod from the water
heater’s tank, except for
inspection and/or replacement,
as operation with the anode
rod removed will greatly
shorten the life of the glass
lined tank and will exclude
warranty coverage.
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16
Before You Call For Service…
Troubleshooting Tips
Save time and money! Review the chart on this page first
and you may not need to call for service.
Problem
Possible Causes
What To Do
Rumbling noise
Water conditions in your
● Remove and clean the heating elements.
home caused a build up of
scale or mineral deposits
on the heating elements.
Relief valve
Pressure build up caused
● This is an unacceptable condition and must be
producing popping
by thermal expansion
corrected. Contact the water supplier or plumbing
noise or draining
in a closed system.
contractor on how to correct this. Do not plug the
relief valve outlet.
Rattling noise
Internal heat trap
● This is normal for heat trap fittings when in operation
during periods
fittings in operation.
and does not indicate a need for service.
of water usage
Not enough or
Water usage may have
● Wait for the water heater to recover after an abnormal
no hot water
exceeded the capacity
demand.
of the water heater.
A fuse is blown or a circuit
● Replace fuse or reset circuit breaker.
breaker tripped.
Electric supply may be off.
● Make sure electric supply to water heater and
disconnect switch, if used, are in the ON position.
The thermostat may
● See the Temperature regulation of the water heater
be set set too low.
section of this manual.
Leaking or open hot
● Make sure all faucets are closed.
water faucets.
Electric service to your
● Contact the local electric utility.
home may be interrupted.
Improper wiring.
● See the Installing the water heater section of this
manual.
Manual reset limit (ECO).
● See the Temperature regulation of the water heater
section of this manual.
Cold water inlet
● This is normal. The colder inlet water takes longer
temperature may be
to heat.
colder during the
winter months.
Water is too hot
The thermostat
● See the Temperature regulation of the water heater
is set too high.
section of this manual.
CAUTION: For your safety DO NOT attempt repair of electrical wiring, thermostats, heating elements or other safety
devices. Refer repairs to qualified service personnel.
!
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Replacement Parts.
For 20–120 gallon models with single and double elements.
Instructions For Placing a Parts Order
Address parts orders to the distributor or
store where the heater was purchased.
All parts orders should include:
The model and serial number of the
water heater from the rating plate.
Specify voltage and wattage as
marked on the rating plate.
Part description (as noted below) and
number of parts desired.
CAUTION: For your safety DO NOT
attempt repair of electrical wiring,
thermostat(s), heating elements or other
operating controls. Refer repairs to qualified
service personnel.
!
R
ES
E T
R
E
S
E
T
140
130
120
110
100
90
T H E
R M
- O -
D I S
C
TUR
N O
FF
POW
ER
BEF
ORE
SER
VIC
ING
TUR
N O
FF
POW
ER
BEF
ORE
SER
VIC
ING
140
130
120
110
100
90
T H E
R M
- O -
D I S
C
Drain valve
Jacket access
panel(s)
Heating element
gasket
Heating element
Thermostat
bracket
Lower thermostat
Cavity
insulation
Lower thermostat
protective cover
Cavity insulation
Upper thermostat protective cover
(on double element models only)
Upper thermostat
(on double element
models only)
Upper thermostat bracket
(on double element
models only)
Heating element
(on double element
models only)
Heating element
gasket
(on double element
models only)
Junction box cover
Plate cover
Anode rod
Dip tube gasket
Dip tube/internal heat trap
Temperature & Pressure
relief valve
Internal heat trap
Internal heat trap
gasket
Some models may have
been supplied with
External heat traps
in lieu of Internal heat traps
17
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18
Cavity Insert Instructions
The following instructions are intended for
qualified service personnel ONLY, and should only
be done when necessary.
In order to replace the thermostat or heating element,
remove the cavity insert crossbar by following the
instructions below:
Turn off the power to the water heater.
Remove the jacket access panel(s) and insulation.
Rotate the crossbar up and down until it breaks away
from the remainder of the cavity insert.
(See illustration to the left)
Discard the crossbar. It cannot and need not be
replaced.
Replace the thermostat and/or element as necessary.
Replace the insulation and jacket access panel(s)
before turning on the power to the water heater.
NOTICE: The cavity insert crossbar is necessary for the
manufacturing process only. The removal of the
crossbar will not interfere with the operation of the
water heater.
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19
IF YOU NEED SERVICE
1. Should you have any questions about your new water heater, or if it requires
adjustment, repair, or routine maintenance, it is suggested that you first contact
your installer, plumbing contractor or previously agreed upon service agency. In
the event the firm has moved, or is unavailable, refer to the telephone directory,
commercial listings or local utility for qualified service assistance.
2. Should your problem not be solved to your complete satisfaction, you should
then contact the Manufacturer’s National Service Department at the following
address:
2600 Gunter Park Drive
Montgomery, Alabama 36109-1413
Phone: 1-800-432-8373.
When contacting the manufacturer, the following information will be requested:
a. Model and serial number of the water heater as shown on the rating plate attached
to the jacket of the heater.
b. Address where the water heater is located and physical location.
c. Name and address of installer and any service agency who performed service on
the water heater.
d. Date of original installation and dates any service work was performed.
e. Details of the problems as you can best describe them.
f. List of people, with dates, who have been contacted regarding your problem.
If you need a manual in Spanish, please refer to our website: www.rheem.com.
Si requiere de un manual de uso y cuidado en espanol, Usted puede obtanerlo
en www.rheem.com.
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Grounding conductor may be required.
Refer to Wiring Section of Manual
*
This water heater is factory equipped for two (2) wire connection to
electrical power. For use with "off-peak" meter (timer) remove wire
nut from red and black leads and connect to "off-peak" meter (timer).
!
Wiring Diagrams — Therm-O-Disc Thermostats (Type 59T)
SINGLE ELEMENT
DOUBLE ELEMENT
SIMULTANEOUS OPERATION
DOUBLE ELEMENT
SIMULTANEOUS OPERATION
WITH 4 WIRE OUTLET
DOUBLE ELEMENT
NON-SIMULTANEOUS
DOUBLE ELEMENT
NON-SIMULTANEOUS
WITH 4 WIRE OUTLET !
DOUBLE ELEMENT
NON-SIMULTANEOUS
WITH 3 WIRE OUTLET
FIG. A-1
FIG. A-2
FIG. B
FIG. C
FIG. D
FIG. E
FIG. F
2
1
2
THERMOSTAT
& HIGH TEMP.
LIMIT (ECO)
HEATING
ELEMENT
WHITE
BLACK
BLACK
H
JUNCTION
BOX
N
1
G
BRANCH CIRCUIT
TO ELECTRICAL
DISTRIBUTION PANEL
120 V ONLY
2
1
2
THERMOST
AT
& HIGH
HEATIN
G
RE
BLAC
BLAC
L1
G*
BRANCH CIRCUIT
TO ELECTRICAL
DISTRIBUTION
JUNCTIO
N
4
L2
RE
1
3
SINGLE ELEMENT
2
UPPER THERMOSTAT
& HIGH TEMP. LIMIT
(ECO)
UPPER
HEATING
ELEMENT
BLUE
L1
JUNCTION
BOX
4
L2
1
3
BLACK
RED
BLACK
LOWER
HEATING
ELEMENT
LOWER
THERMOSTAT
& HIGH TEMP
LIMIT (ECO)
1
2
1
1
2
BLUE
CONNECTOR TO "OFF PEAK"
METER (TIMER)
TM2
4
YELLOW
YELLOW
2
BRANCH CIRCUIT
TO ELECTRICAL
DISTRIBUTION PANEL
BLACK
LOWER
HEATING
ELEMENT
2
UPPER THERMOSTAT
& HIGH TEMP.
LIMIT (ECO)
UPPER
HEATING
ELEMENT
BLUE
YELLOW
BLACK
L1
JUNCTION
BOX
4
L2
RED
1
3
1
2
BLACK
RED
LOWER
THERMOSTAT
1
2
4
BRANCH CIRCUIT
TO ELECTRICAL
DISTRIBUTION PANEL
2
1
2
UPPER THERMOSTAT
& HIGH TEMP. LIMIT
(ECO)
UPPER
HEATING
ELEMENT
BLUE
YELLOW
L1
JUNCTION
BOX
4
L2
RED
1
3
1
2
4
BLACK
BLUE
BLACK
BLUE
YELLOW
LOWER
THERMOSTAT
LOWER
HEATING
ELEMENT
TM 1
BLACK
TM 2
BRANCH CIRCUIT
TO ELECTRICAL
DISTRIBUTION PANEL
G*
G*
G*
BRANCH CIRCUIT
TO ELECTRICAL
DISTRIBUTION PANEL
UPPER THERMOSTAT
& HIGH TEMP. LIMIT (ECO)
2
UPPER
HEATING
ELEMENT
BLUE
L1
JUNCTION BOX
4
L2
1
3
RED (10 GA)
BLACK
LOWER
HEATING
ELEMENT
LOWER
THERMOSTAT
& HIGH TEMP
LIMIT (ECO)
1
2
4
1
3
1
2
RED
2
BLACK
(10 GA)
YELLOW
BLACK (10 GA)
RED
(10 GA)
G*
2
UPPER THERMOSTAT
& HIGH TEMP. LIMIT (ECO)
UPPER
HEATING
ELEMENT
BLUE
L1
BRANCH CIRCUIT
TO ELECTRICAL
DISTRIBUTION PANEL
JUNCTION BOX
4
L2
1
3
BLACK (10 GA)
RED (10 GA)
BLACK
LOWER
HEATING
ELEMENT
LOWER
THERMOSTAT
& HIGH TEMP
LIMIT (ECO)
1
2
4
1
3
1
2
RED
2
BLUE
(10 GA)
TO SECOND POWER SOURCE,
"OFF PEAK" METER, OR TIMER
TM2
TM1
YELLOW
(10 GA)
YELLOW
G*
THIS ELECTRIC WATER HEATER IS WIRED AS INDICATED ABOVE OR BELOW
Wiring Diagrams
Electric Water Heaters for
3 - Phase Applications
Therm-O-Disc Thermostats
(Type 59T)
For the connection of this
water heat er to a 3-Phase Branch
Circuit, con nect field wiring to
the water heater as indicated in
the ap pro pri ate wiring diagram
at right. A sep a rate junction box
is being supplied with this water
heater (check bot tom of carton)
to accomodate wir ing and con-
duit con nections. Install the
Junction Box as shown on the
Installation/Instruction Sheet
in clud ed in the plastic bag
at tached to the heater.
DOUBLE ELEMENT
SIMULTANEOUS OPERATION
DOUBLE ELEMENT
NON-SIMULTANEOUS
FIG. G
FIG. H
2
UPPER THERMOSTAT
& HIGH TEMP. LIMIT (ECO)
UPPER
HEATING
ELEMENT
BLUE
4
L3
BLACK
BLACK
LOWER
HEATING
ELEMENT
LOWER
THERMOSTAT
& HIGH TEMP
LIMIT (ECO)
1
1
2
RED
2
BLUE
YELLOW
G*
YELLOW
3
L2
1
1
L1
2
4
3- PHASE BRANCH CIRCUIT
TO ELECTRICAL
DISTRIBUTION PANEL
2
UPPER THERMOSTAT
& HIGH TEMP. LIMIT (ECO)
UPPER
HEATING
ELEMENT
BLUE
3- PHASE BRANCH CIRCUIT
TO ELECTRICAL
DISTRIBUTION PANEL
4
L3
BLACK (10 GA)
RED (10 GA)
BLACK
LOWER
HEATING
ELEMENT
LOWER
THERMOSTAT
& HIGH TEMP
LIMIT (ECO)
1
4
1
2
RED
2
BLUE (10 GA)
YELLOW
G*
YELLOW (10 GA)
3
3
L2
1
1
L1
2
20
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