Rheem Light Duty Commercial Electric Water Heater Use And Care Manual
Light Duty Commercial Electric Water Heater
U S E & CA R E MA NUAL
WITH INSTALLATION INSTRUCTIONS FOR THE INSTALLER
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
“How to obtain service assistance.”
®
LISTED
786H
Do Not Destroy this Manual. Please read carefully and
! !
keep in a safe place for Future Reference.
NOTICE: This water heater is designed for use in a commercial application and the installation and maintenance of
it should be performed by qualified, licensed service personnel. If the foregoing assumption is not appropriate, then
!
we recommend that you obtain and retain our Residential Use & Care Manual.
CALIFORNIA PROPOSITION 65
cancer, birth defects or other reproductive harm.
!
Printed in USA
WARNING
Recognize this symbol as an Indication of Important
Safety Information!
: This product contains chemicals known to the State of California to cause
AP11564-10 (01/05)
Safety Information
Safety Precautions . . . . . . 3
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.
Installation Instructions
Location . . . . . . . . . . . . . . . 4
Water Connections . . . . . . 4
Electrical Connections . 5, 6
Operating Instructions
Safety Controls . . . . . . . . . 7
Water Temperature . . . . . . 7
Care and Cleaning
Long Time Shut-Down . . . 8
Draining . . . . . . . . . . . . . . . 8
Maintenance . . . . . . . . . . . 8
Proof of the original purchase date is needed to obtain
service under the warranty.
READ THIS MANUAL
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 THE SAFETY INFORMATION
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.
T r oubleshooting Tips
Troubleshooting
Guide . . . . . . . . . . . . . . . . . 9
Customer Service
How to Obtain
Service Assistance . . . . . . 9
Parts List . . . . . . . . . . . . . 10
Wiring Diagram . . . . . . . 12
All safety messages will follow the safety alert symbol
and either the word “DANGER”, “WARNING”, “CAUTION”
or “NOTICE”.
These words mean:
!
DANGER
!
WARNING
!
CAUTION A potentially hazardous situation
Notice:
An imminently hazardous situation
that will result in death or serious
injury.
A potentially hazardous situation
that could result in death or
serious injury and/or damage to
property.
that may result in minor or
moderate injury.
Attention is called to observe a
specified procedure or maintain
a specific condition.
General Safety Precautions
!
Be sure to read and understand the entire Use & Care Manual before attempting to install or operate this water heater. Pay particular attention to the
following General Safety Precautions. Failure to follow these warnings could result in serious bodily injury or death . Should you have any problems understanding the instructions in this manual, STOP, and get help from a qualified installer or service technician or the local utility.
To meet commercial water use needs, the thermostat on this
water heater is adjustable to deliver water up to 170°F. However,
water temperatures over 125°F. can cause severe burns instantly
or death from scalds. This is the preferred starting point for
setting the control for supplying general purpose hot water.
!
DANGER
HOT
Maximum water temperatures occur just after the thermostat has
shut off the elements. To find the hot water temperature being
delivered, turn on a hot water faucet and place a thermometer in
the hot water stream and read the thermometer.
The following chart details the relationship of water temperature and time with regard to scald injury and may be
used as a guide in determining the safest water temperature for your applications.
TIME / TEMPERATURE RELATIONSHIPS IN SCALDS
Temperature Time to Produce Serious Burn
120°F (49°C) More than 5 minutes
125°F (52
°C)
11/2to 2 minutes
130°F (54°C) About 30 seconds
135°F (57°C) About 10 seconds
140°F (60°C) Less than 5 seconds
145°F (63°C) Less than 3 seconds
150°F (66°C) About 1
1
/2seconds
155°F (68°C) About 1 second
Table courtesy of Shriners Burn Institute
The temperature of the water in the heater can be regulated by adjusting the thermostat. To comply with safety regulations the thermostat was set at the factory to a setting
corresponding to 120°F (49°C).
BURN
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.
Safety and energy conservation are factors to be considered
when setting the water temperature on the thermostat. The most
energy efficient operation will result when the temperature setting
is the lowest that satisfies the needs consistent with the
application.
Reset Button
Thermostat Protective
Cover
CAUTION!! — Hotter water increases the risk of SCALDING!
T
E
S
E
170
160
TURN OFF
POWER
BEFORE
SERVICING
R
E
S
E
T
R
Thermostat Dial
Pointer
110
120
130140150
The illustration above shows the temperature adjustment
dial used for setting the water temperature. Refer to Operation section of this manual for detailed instructions in
how to adjust the thermostat(s).
DANGER
!
Hotter water increases the potential for Hot Water SCALDS.
NOTICE: When this water heater is supplying general purpose
hot water requirements for use by individuals, a thermostatically
controlled mixing valve for reducing point of use water
temperature is recommended to reduce the risk of scald injury.
Contact a licensed plumber or the local plumbing authority for
further information.
3
Introduction
The location chosen for the water heater must take into consideration the
CAUTION
following:
!
The water heater should not be located in an area where leakage of
LOCAL INSTALLATION REGULATIONS
This water heater must be installed in accordance with these instructions,
local codes, utility company requirements or, in the absence of local codes,
the latest edition of the National Electrical Code. It is available from some
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.
local libraries or can be purchased from the National Fire Prevention
Association, 1 Batterymarch Park, Quincy, MA 02269 as booklet ANSI/NFPA
70. In Canada, use the latest edition of the Canadian Electric Code.
NOTICE: Auxiliary catch pan installation MUST conform to local
codes.
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.
A — Diameter of water
heater plus 2" (5 cm)
min.
B — Maximum 2" (5 cm)
Figure 1. — Auxiliary Catch Pan
Catch Pan Kits are available from the distributor or store where
the water heater was purchased.
B
To open drain, line should
A
3
/4" (1.9cm) ID
be at least
and pitched for proper
drainage.
Installation
1. 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 that for which the water heater is
equipped.
2. THERMAL EXPANSION — Determine if a check valve exists in the
inlet water line. 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 pres-
sure 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 pos-
sibly 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 Figure 2.) 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 heat trap fittings. If
sweat connections are used, sweat tubing to adapter before fitting
adapter to water connections on heater. Any heat applied to the water
connections will permanently damage the heat trap fittings.
WATER SUPPLY CONNECTIONS — Refer to Fig. 2 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.
3. RELIEF VALVE — A new combination pressure and temperature
relief valve, complying with the Standard for Relief Valves and
Automatic Gas Shutoff Devices for Hot Water Supply Systems,
ANSI Z21.22, must be installed in the opening provided and
marked for the purpose on the water heater. (Refer to Fig. 2.) No
valve of any type should be installed between the relief valve and
the tank. Local codes shall govern the installation of relief valves.
4
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