Rheem Residential 40 & 50 Gallon User manual

Water Heaters
Electric Residential Heat Pump
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.
Residential 40 & 50 Gallon
92-103234-02
AP15121-1 (01/10)
Printed in USA
Use & Care Manual
With Installation Instructions for the Installer
© 2009 Rheem Manufacturing Co.

Care and Cleaning
Draining ................ 17
Maintenance . . . . . . . . . . . . . 17
Extended Shut-Down . . . . . 18
Safety Information
Safety Precautions . . . . . . . 3, 4
Installation Instructions
Location ................. 5
Water Connections . . . . . . . . 6
Relief Valve . . . . . . . . . . . . . . 7
Electrical Connections. . . . . . 8
Pipe Insulation . . . . . . . . . 9-10
Condensate Drain . . . . . . . . 10
Installation Checklist . . . . . . .11
Operating Instructions
Safety Controls . . . . . . . . . . 12
Water Temperature . . . . . . . .12
Sequence of Operations 14-16
Troubleshooting Tips
Before You Call
For Service . . . . . . . . . . . . . . 19
Customer Service
Parts List . . . . . . . . . . . . . . . . 20
Wiring Diagram . . . . . . . . . . 22
If You Need
Service ................ 24
2
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.
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
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

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 water heater interface control. To comply with
safety regulations the temperature was set at 122°F
before the water heater was shipped from the factory.
The illustration at the
left shows the water
temperature setting.
Refer to the
Operating Instructions
in this manual for
detailed instructions
in how to adjust the
water temperature.
! DANGER: Hotter water increases the potential for Hot
Water SCALDS.
Time/Temperature Relationship in Scalds
Temperature Time To Produce a Serious Burn
120°F (49°C) More than 5 minutes
125°F (52°C) 1½ to 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 (65°C) About 1½ seconds
155°F (68°C) About 1 second
Table courtesy of Shriners Burn Institute
DANGER
!
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
IMPORTANT SAFETY INFORMATION.
READ ALL INSTRUCTIONS BEFORE USING.
3
DANGER!
WATER TEMPERATURE SETTING
Safety and energy conservation are factors to be considered when selecting the water
temperature setting of water heater. 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 thermistor
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.
TEMPERATURE
SETTING
HEAT PUMP OFF
Review operating manual before use.
Operating procedures are outlined in the
manual for optimal performance.
OPERATION MODE
RISK OF SCALDING INCREASES
WITH HOTTER WATER
CAUTION
Hotter
Water
Cooler
Water
Temperatures
135°-140° F
130°-135° F
125°-130° F
120°-125° F
105°-120° F
90°-105° F

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, 1102 Q
Street,Suite 5100, Sacramento, CA 95814 or you may call 916-445-8100 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.
CAUTION: Do not to “crush” or otherwise impair the removal of the “plastic” front
(side) panel.
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 (temperature limiting control) 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
WARNING!
Disconnect all power to unit before starting maintenance. Failure to do so can cause
electrical shock resulting in severe personal injury or death.

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.
Canadian installations should refer to
CSA22.1, a copy can be purchased
from the Canadian Standards
Association, 5050 Spectrum Way,
Mississauga,ONT L4W 5N6
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.
Place the water heater in such a
manner that the thermistor 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.
NOTICE: Installation in a closet or
confined space is not allowed.
Heat Pump Water Heater requires
approximately 1,000 cu. ft of
unconditioned indoor ambient air to
operate properly.
Clearances
Rear Top
2" 8" Min.
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.
Catch Pan should not
obstruct cold inlet or drain
valve.
B
ATo open drain, line
should be at least 3/4″ ID
and pitched for proper
drainage.
5
Refrigerant
This heat pump water heater is factory charged with an environmentally
friendly, non-chlorinated refrigerant, R410A. This refrigerant has zero ozone
depletion potential.
!
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. Rating plate is located on front of water heater.

Installing the water heater.
6
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 on the next page). 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.
Water Supply Connections
Refer to the illustration on the next page
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. See page 8 on "To Fill The Water
Heater".
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.
Condensate Drains for the Heat Pump
Consult local codes or ordinances for
specific requirements. Refer to page 7.
IMPORTANT: When making drain fitting
connections to the drain tubing, use a thin
layer of piping tape or silicone and install
hand tight.
IMPORTANT: When making drain fitting
connections to the drain tubing, DO NOT
overtighten. Overtightening fittings can split
pipe connections on the drain pan.
• Do not reduce drain line size less than
connection size provided on condensate
drain.
• All drain lines must be pitched
downward away from the unit a
minimum of 1/8" per foot of line to
ensure proper drainage.
• Do not connect condensate drain line
to a closed or open sewer pipe. Do not
allow condensate to drain into the water
heater drain pan.
• The drain line should be insulated
where necessary to prevent sweating
and damage due to condensate forming
on the outside surface of the line.
• This unit is equipped with a 3/4"
primary condensate connection and a
1/2" overflow connection.

!
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/CSA 4.4, is installed in the
opening provided. 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.
7
Typical Installation
Electrical Access for
Hook-up
Hot water outlet to xtures
Cold Water Supply
Drain Valve
Temperature and Pressure Relief
Valve and discharge line
Union
Union
Heat Pump Filter
Access Door to
Temperature Control
Shut Off Valve
6" Air Gap
Thermal Expansion
Tank (if required)
8" Minimum Clearance above Heat
Pump to allow air circulation
Ceiling in Alcove
Primary Condensate line (3/4")
to open drain or outdoors
Heat Trap
6" Min.
Secondary Condensate tubing
(1/2") to open drain or outdoors

8
Installing the water heater.
Electrical Connections
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.
!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.
Electrical Power
Hookup Terminals
Ground Screw
!
WARNING!
Turn off electric power at the fuse box or
service panel before making any electrical
connections.
Also, the ground connection must be
completed before making line voltage
connections. Failure to do so can result in
electrical shock, severe personal injury or
death.
Disconnect all power to unit before starting
maintenance. Failure to do so can cause
electrical shock resulting in severe personal
injury or death
The unit must be grounded. Failure to do so
can cause electrical shock resulting in severe
personal injury or death.

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 heat pump.
 Do not cover the coils around the
sides of the heat pump.
 Do not cover the access door to
temperature control, temperature and
pressure relief valve or drain 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
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.
A separate branch circuit with copper
conductors, over current 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 Electrical Power Hookup
Terminals inside the 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.
• 240V 1PH
• 21.5 Max. AMP draw
• 10 gauge wire
• Minimum 30 AMP circuit
9
!
Filter
Coils
Top of Heat Pump
Electrical Connections continued.

10
Installing the water heater.
Please install the insulation on the cold
water supply inlet and the hot water
outlet as shown in the illustration.
Hot and Cold Pipe Insulation Installation
For increased energy efficiency,
this water heater has been supplied
with two 2-3/8” sections of pipe
insulation.
Please install the insulation, according
to the illustration at left.
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.
Slip the insulation cover over the
drain valve through the center hole.
Relief and DrainValve Insulation Installation
!CAUTION: Ensure the
T&P Valve opening is not
obstructed by the insulation.
Hot Water
Outlet
Cold Water
Inlet
Relief
Valve
Drain Valve

Installation Checklist
11
A. Water Heater Location
❑ Close to area of heated water demand.
❑ Indoors and protected from moisture,
wet conditions and freezing
temperatures.
❑ Area free of flammable vapors.
❑ 1,000 cu. ft unconditioned indoor space.
❑ Provisions made to protect area from
water damage.
❑ Sufficient room to service heater.
❑ Eight inches (8") of clearance from
ceiling to top of heat pump water heater
to allow for air circulation.
❑ Access to condensate disposal.
B. Water Supply
❑ Water heater completely filled with
water.
❑ Air purged from water heater and piping.
❑ Water connections tight and free of
leaks.
C. Relief Valve
❑ Temperature and Pressure Relief Valve
properly installed and discharge line run
to open drain.
❑ Discharge line protected from freezing.
D. Wiring
❑ Power Supply voltage agrees with water
heater rating plate.
❑ Branch circuit wire and fusing or circuit
breaker of proper size. (Minimum 30
amp breaker)
❑ Electrical connections tight and unit
properly grounded.
❑ 10 gauge wire.
E. Condensate Lines
❑ Condensate lines from heat pump
installed correctly.
❑ Condensate lines from heat pump run to
a suitable drain location.

The water heater is equipped with a
temperature limiting control (ECO)
that is located above the upper 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:
(Refer to Illustration on page 21):
Turn off the power to the water
heater.
Remove the plastic housing.
Remove the jacket access top
panel and insulation.
Press the red RESET button.
Replace the insulation and jacket
access panel before turning on
the power to the water heater.
12
!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
pushing the up or down arrow on
the keypad located behind the access
panel.
Safety and energy conservation
are factors to be considered when
selecting the water temperature setting
of the water heater. The lower the
temperature setting, the greater the
savings in energy and operating costs.
To comply with safety regulations the
temperature is factory set at 122°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 electronic control
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 on the next page may be
used as a guide in determining the
proper water temperature for your
home.
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
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.

13
For the most efcient operation of the
heat pump water heater, the "Energy
Saver" mode is recommended. Press
the key on the control pad labeled "En-
ergy Saver". The corresponding LED
will light up upon activation.
If the "Energy Saver" setting does not
supply enough hot water or additional
hot water is needed, use the "Normal"
setting. Press the key on the control
pad labeled "Normal". The correspond-
ing LED will light up upon activation.
If electric heat only is desired, press
the "Electric Heat Only" option in the
bottom right corner of the control.
This mode will run for approximately
2 weeks then return to the mode and
temperature settings set by the user.
If the water temperature setting needs
adjustment, use the up arrow key to in-
crease water temperature and the down
arrow key to decrease water tempera-
ture.
As the temperature of the water increas-
es, the led lights on the right side of the
"Temperature Setting" will illuminate to
indicate the temperature of the water.
To turn the water heater "OFF", press
the "OFF" key in the bottom left corner
of the control pad.
Basic Water Heater Operation
Heat Pump Water Heater Sequence of Operation
Operational Modes:
Two major modes of operation will be
utilized:
Energy Saver
This mode will provide functional
control operation resulting in water
heater performance that meets
Energy Star requirements. As a
result, compressor operation will be
maximized and use of electric heat will
be minimized.
Normal / High Demand
This mode will maximize the
performance of the water heater while
still providing good energy savings.
Primary goal is to maintain water
heater performance that meets or
exceeds a comparable electric water
heater.
Temperature Settings:
Normal / Warm
Tank temperature will be maintained
at 120-124º F. Compressor operation
will be allowed whenever the tank
temperature at the lower heating
element location falls to 105º F or
below.
Hot
Tank temperature will be maintained
at 130-135º F. Compressor operation
will be allowed whenever the tank
temperature at the lower heating
element falls to 110º F or below.
Vacation
Tank temperature will be maintained
at about 90º F. Compressor operation
will be allowed whenever the tank
temperature at the lower heating
element falls to 80º F or below. All
other functional aspects will be
maintained as described below.
Electric Heat Only:
This mode is utilized in conjunction
with Normal, Hot, and Vacation modes.
In this mode compressor operation
will not be allowed and only the
auxiliary electric heat will be allowed.
Temperature set points noted with each
of the modes will be used to turn the
auxiliary electric heat on as required.
This mode can only be utilized on
a short term basis. Currently, this
mode will be allowed for a period
of 2 weeks. After this time period,
the water heater will be returned to
the mode and temperature settings
previously set by the user.

14
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.
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 electronic
control, heat pump 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,
Contact a qualified installer or
plumbing contractor to inspect.
IMPORTANT: See "DANGER
on left". At least once a year, lift
and release the lever handle on the
temperature pressure relief valve,
located on the side of the water heater,
to make certain the valve operates
freely. Allow several gallons to flush
through the discharge line to an open
drain.
It is recommended to clean the
filter on top of the heat pump every
month. Clean by washing with
mild detergent and water. Dry and
replace over discharge fan. Remove
the filter by lifting up on the handle
at front of the heat pump and lifting
it off the air discharge fan. See
Figure on right.
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.
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.
Filter
Filter Handle
WARNING: Disconnect all
power to unit before starting
maintenance. Failure to do so
can cause electrical shock
resulting in severe personal
injury or death.

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 a
non-removable 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. Operation
with the anode rod removed
will greatly shorten the life of
the glass lined tank and will
exclude warranty coverage.

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
home caused a build up of
scale or mineral deposits in
the water heater.
● Allow a few quarts of water to run from drain valve
to remove sediment settlings.
Relief valve produc-
ing popping noise or
draining
Pressure build up caused
by thermal expansion in a
closed system
● This is an unacceptable condition and must be cor-
rected. Contact the water supplier or plumbing con-
tractor on how to correct this. Do not plug the relief
valve outlet
Not enough or no
hot water
Water usage may have ex-
ceeded the capacity of the
water heater.
● Wait for the water heater to recover after an abnormal
demand
A fuse is blown or a circuit
breaker tripped
● Replace fuse or reset circuit breaker
Electric supply may be off ● Make sure electric supply to water heater and section
of this manual.
The thermostat may be set
too low.
● See the Temperature regulation of the water heater
section of this manual
Leaking or open hot water
faucets
● Make sure all faucets are closed
Electric service to your
home may be interrupted
● Contact the local electric utility.
Improper wiring. ● See the Installing the water heater section of this
manual.
Manual reset limit (ECO) ● See the Temperature regulation of the water heater
Refer to page 21 for more information.
Cold water inlet tempera-
ture may be colder during
the winter months
● This is normal. The colder inlet water takes longer to
heat.
Not enough clearance
above heat pump to allow
air to circulate.
● Make sure there is at least 8" of air space between the
top of the heat pump and the ceiling.
Water is too hot The thermostat is set too
high.
● See the Temperature regulation of the water heater
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.

17
140
130
120110
100
90
T H E R M - O - D I S C
Air Filter
Temperature & Pressure
Relief Valve
Drain Valve
Replacement Parts.
For 50 gallon Heat Pump Water Heaters.
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, heating
elements, heat pump or electronic controls.
Refer repairs to qualified service personnel.
Lower
Thermistor
Element
Element
Plastic Housing
(Removed for
Clarication of
Replacement Parts.)
Thermistor
ECO
Cavity covers

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 ECO,thermistor 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.
See page 20.
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 ECO,thermistor 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.

19
Wiring Diagram

20
head
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:
1241 Carwood Court
Montgomery, Alabama 36117
Phone: [phone].
When contacting the manufacturer, the following information will be
requested:
a. Model and serial number of the water heater as shown on the rating label
located on front of the water 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.