Rheem Professional Classic Series Powered Damper, Professional Classic Plus Series Electric, Professional Classic Plus Series High Efficiency User Manual
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786H
Use & Care Manual
With Installation Instructions for the Installer
Electric Residential
Water Heaters
Single and Double Element Models,
Residential 20–120 Gallon
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.
®
LISTED
Printed in USA
AP9029-10 (06/13)
Safety Information
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Safety Precautions ....... 3, 4
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 ................. 5
Water Connections ........ 6
Electrical Connections. . . . . . 8
Operating Instructions
Safety Controls .......... 12
Water Temperature ........13
Care and Cleaning
Draining ................ 16
Maintenance ............. 16
Extended Shut-Down ..... 17
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.
All safety messages will follow the safety alert symbol and
either the word “DANGER”, “WARNING”, “CAUTION” or
Troubleshooting Tips
Before You Call
For Service .............. 18
Customer Service
Parts List ................ 19
If You Need
Service ................. 21
Wiring Diagram ......... 22
“NOTICE”.
These words mean:
DANGER
that will result in death or serious
injury.
WARNING
could result in death or serious injury
and/or damage to property.
!
CAUTION
may result in minor or moderate
injury.
Notice:
specified procedure or maintain
a specific condition.
An imminently hazardous situation
A potentially hazardous situation that
A potentially hazardous situation that
Attention is called to observe a
2
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IMPORTANT SAFETY INFORMATION.
R
E
S
E
T
R
E
S
E
T
TURN OFF
POWER
BEFORE
SERVICING
90°F150°F
125°F
(66°C)
(52°C)
(32°C)
READ ALL INSTRUCTIONS BEFORE USING.
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.
Time/Temperature Relationship in Scalds
Temperature Time To Produce a Serious Burn
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DANGER
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
HOT
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.
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.
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
Reset button
for setting the water
temperature.
Thermostat dial
pointer
Refer to the Operating
Instructions in this
manual for detailed
instructions in how to
adjust the thermostat(s).
Thermostat
protective
cover
DANGER: Hotter water increases the potential for
Hot Water SCALDS.
3
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.
SAFETY PRECAUTIONS
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.
READ AND FOLLOW THIS SAFETY INFORMATION
CAREFULLY.
SAVE THESE INSTRUCTIONS
4
Installing the water heater.
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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
Location
Locate the water heater in a clean dry area
as near as practical to the area of greatest
heated water demand. Long un-insulated
hot water lines can waste energy and
water.
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.
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.
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.
B
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.
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
To open drain, line
should be at least 3/4″ ID
and pitched for proper
drainage.
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.
5
Installing the water heater.
Vacuum Relief Va lve
If required, install per local codes
instructions.
Thermal Expansion
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
Typical Installation
To electrical
distribution panel
Heat trap
6" minimum
Hot water outlet
to fixtures
Electrical junction box
(use only copper conductors)
Jacket access
panels
Union
Anode
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.
Temperature
&
Pressure
Relief Valve
Thermal
expansion tank
(if required)
Union
Heat trap
6" minimum
(Not Supplied)
and valve manufacturer’s
To cold water
supply
Shut-off
valve
Auxiliary catch pan
2" maximum
6
Drain valve
Relief valve discharge line
to suitable open drain
6" air gap
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A new combination temperature and pressure relief valve, complying with the Standard for Relief
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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
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.
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
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.
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.
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.
7
Installing the water heater.
WARNING
WARNING
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Ground screw
Conduit
connector
Wire connections
Water heater junction box.
Junction
box cover
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
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.
connectors etc. can cause
the water heater to be
electrically isolated.
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
Single Phase
Wiring
3 Phase
Wiring
8
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
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
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