Rheem Single and Double Element Models, 40 Gallon Single Element, 40 Gallon Double Element Use & Care Manual
Residential Electric Water Heate
®
LISTED
786H
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USE & CARE MANUAL
WITH INSTALLATION INSTRUCTIONS FOR THE CONTRACTOR
Single and Double Element Models
40 Gallon Capacity
The purpose of this manual is twofold: one, for the installing contractor, to provide requirements 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 trouble shooting 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 that they
may understand how to do so.
Do Not Destroy this Manual. Please read carefully and
keep in a safe place for Future Reference.
CALIFORNIA PROPOSITION 65 WARNING: This product contains chemicals known to the State of California to cause
cancer, birth defects or other reproductive harm.
Recognize this symbol as an Indication of Important
Safety Information!
AP8319-9(03/08)Printed in USA
General Safety Precautions
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TURN OFF
POWER
BEFORE
SERV ICING
90°F150°F
125°F
(66°C)
(52°C)
(32°C)
WA RNING
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DANGER
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Be sure to read and understand the entire Use & Care Manual before attempting to install or operate this water heater. It may save you time and cost. Pay
particular attention to the General Safety Precautions. 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 installer, service technician, or the
local electric utility.
TIME / TEMPERATURE RELATIONSHIPS IN SCALDS
Temperature Time to Produce Serious Burn
WATER TEMPERATURE ADJUSTMENT - 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
The chart shown above may be used as a guide in determining the proper water temperature for your home.
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
NOTE: 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.
Reset Button
Thermostat Dial
Pointer
Thermostat Protective
Cover
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).
There is a Hot Water SCALD Potential if the thermostat is
set too high.
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 au-
thority for further information.
2
Introduction
CAUTION
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WA RNING
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The location chosen for the water heater must take into consideration the
following:
LOCAL INSTALLATION REGULATIONS
This water 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 local
libraries or can be purchased from the National Fire Prevention Association, 1
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 front
panel can be easily 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.
Installation
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.
This water heater SHOULD NOT be installed in a space where
liquids which give off flammable vapors are to be used or
stored. Such liquids include gasoline, LP gas (butane and
propane), paint or adhesives and their thinners, solvents or
removers. Because of natural air movement in a room or
other enclosed space, flammable vapors can be carried from
where their liquids are being used or stored. The arc drawn
within the water heater's control can ignite these vapors
causing an explosion or fire which may result in severe burns
or death to those in range, as well as property damage.
1. INSPECT SHIPMENT — Inspect 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 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. 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 vale. Other methods of controlling thermal expansion are also
available. Contact your installing contractor, water supplier, or plumbing
inspector for additional information regarding this subject.
3. WATER SUPPLY CONNECTIONS — Refer to Fig. 2 for suggested
typical installation. The installation of unions or flexible copper con-
nectors 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.
IMPORTANT!! Do not apply heat to the hot or cold water connections. If
sweat connections are used, sweat tubing to adapter before fitting adapter to hot or cold water connections on heater. Any heat applied to the hot
or cold water supply fittings will permanently damage them.
4. RELIEF VALVE — A new combination temperature and pressure 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.
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. 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 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 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.
5. TO FILL WATER HEATER — Make certain drain valve is completely
closed. Open shut-off valve in cold water supply line. Open each hot
water faucet slowly to allow 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.
3
Installation
WA RNING
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CAUTION
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Grounding Screw
To Electrical
Distribution Panel
Flexible Connectors for
Water Connections at
Tank Fittings
Shut-Off Valve in
Cold Water
Supply Line
To Cold Water
Supply
To Electrical Distribution Panel
(Use only Copper Conductors)
Hot Water
Outlet to Fixtures
Wiring Junction
Bracket
Temperature & Pressure
Relief Valve
Anode
Relief Valve Discharge
Line to suitable open drain
Figure 2. — Typical Installation (Pictured from rear of heater
with Top Panel and Insulation Pad removed).
Temperature & Pressure
Relief Valve Coupling
Anode Location
FRONT OF WATER HEATER
Hot Water
Outlet Coupling
Cold Water
Inlet Coupling
Electrical
Junction
Bracket
Figure 3. — Location of water connections on water heater
tank. (Pictured with top insulation pad removed
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.
The branch circuit wiring should include either:
A. Metallic conduit or metallic sheathed cable approved for use as a
grounding conductor and installed with fittings approved for the purpose.
P
Total h
Water a
Heater s
Wattage e 208V 240V 277V 480V 208V 240V 277V 480V
Recommended Over
Current Protection Copper Wire Size -
(Fuse or Circuit Breaker) AWG Based on N.E.C.
Amperage Rating Table 310-16 (75°C.)
Tank MUST BE full of water before power is turned on. Heating element(s)
WlLL BE DAMAGED if energized for even a short time while tank is dry. The
water heater’s warranty does not cover damage or failure resulting from
operation with an empty or partially empty tank. (Reference is made to the
limited warranty for complete terms and conditions.)
6. ELECTRICAL CONNECTIONS — A separate branch circuit with cop-
per 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 the National Electrical Code
ANSI/NFPA 70.
The water heater is completely wired to the junction bracket inside
jacket at top front of water heater. An opening for l/2” or 3/4” electrical
fitting is provided for field wiring connections. (Refer to Fig. 3)
The voltage requirements and wattage load for the water heater is
specified on the rating plate on front of heater.
Table 1 recommends minimum branch circuit sizing based on Na-
tional Electric Code. Refer to wiring diagram on back cover of this
manual for field wiring connections.
1 20 20 15 15 12 12 14 14
3,000
3 20 20 --- 15 12 12 --- 14
1 25 25 20 15 10 10 12 14
4,000
3 25 25 --- 15 10 10 --- 14
1 30 25 25 15 10 10 10 14
4,500
3 30 25 --- 15 10 10 --- 14
1 30 30 25 15 10 10 10 14
5,000
3 30 30 --- 15 10 10 --- 14
1 35 30 25 15 8 10 10 14
5,500
3 35 30 --- 15 8 10 --- 14
1 40 35 30 20 8 8 10 12
6,000
3 35 30 --- 15 8 10 --- 14
1 50 45 40 25 8 8 8 10
8,000
3 45 40 --- 20 8 8 --- 12
1 --- 50 45 25 --- 8 8 10
9,000
3 50 45 --- 25 8 8 --- 10
1 --- --- 50 30 --- --- 8 10
10,000
3 --- 50 --- 25 --- 8 --- 10
1 --- --- 50 30 --- --- 8 10
11,000
3 --- 50 --- 25 --- 8 --- 10
1 --- --- --- 35 --- --- --- 8
12,000
3 --- --- --- 30 --- --- --- 10
Table 1. — Branch Circuit Sizing and Wire Size Guide Based
on N.E.C. ANSI / NFPA 70
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