AO Smith Water Heater 318257 000 User Manual

A.O. Smith – Voltex™  
Hybrid Electric  
Heat Pump Water Heater  
Installation  
Instructions and  
Use & Care Guide  
To obtain technical, warranty or service assistance during or after  
the installation of this water heater, call toll free  
1-800-527-1953  
When calling for assistance, please have the following  
information ready:  
1. Model number  
2. 7 Digit product number  
3. Serial number  
4. Date of installation  
5. Place of Purchase  
Table of Contents  
Page  
Water Heater Safety ............................................................................... 2  
Installing Your Water Heater .................................................................3-9  
Consumer Information ................................................................ 3  
Consumer Responsibilities ......................................................... 3  
Unpacking Instructions ............................................................3-4  
Location Requirements ............................................................... 4  
Water System Piping................................................................5-6  
Temperature & Pressure Relief Valve.......................................7-8  
Electrical Requirements ...........................................................8-9  
Installation Checklist .............................................................................. 10  
Operating Your Water Heater ........................................................... 11-13  
Before Using ............................................................................. 11  
Water Temperature Regulation ................................................. 11  
Adjusting the User Interface Module/ Operational Mode .......... 12  
Operational Conditions ............................................................. 13  
Maintenance of Your Water Heater ..................................................14-15  
Temperature and Pressure Relief Valve.................................... 14  
Draining and Flushing................................................................ 14  
Heating Element Replacement.............................................14-15  
Cleaning the Heat Pump ........................................................... 15  
Diagnostic Codes .................................................................................. 16  
Troubleshooting Chart ........................................................................... 17  
Repair Parts Illustration ......................................................................... 18  
Notes.................................................................................................19-20  
318257-000  
February 2010  
 
INSTALLING YOUR WATER HEATER  
the water while the electric elements only function during  
Consumer Information  
high demand periods. (See “Adjusting the User Interface  
Module/ Operational Mode” section). The more often  
the unit operates using the heat pump, rather than the  
elements, the more efcient the unit will be.  
This water heater should be installed in accordance with  
the local code authority having jurisdiction, the power  
company or electric utility, and this installation manual.  
In the absence of local code requirements, follow the  
regulations set forth in the latest edition of The National  
Electric Code, NFPA 70. This is available from the  
following:  
The 80-gallon tank capacity of this water heater is intended  
to take optimal advantage of the heat pump’s capability to  
heat water for large families or those having higher than  
normal hot water requirements. This high capacity will  
enable the unit to operate in the maximum efciency mode  
more often than other models having lower capacity.  
The HPWH uses about half the electricity of a comparably  
sized conventional electric water heater when operating  
in the Efciency Mode, and provides up to ½ ton cooling  
capacity and dehumidication. It is designed for indoor,  
residential applications for installation in a basement,  
garage or utility room (See “Location Requirements”  
section).  
National Fire Protection Association  
1 Batterymarch Park  
Quincy, MA 02269  
American National Standards Institute  
1430 Broadway  
New York, NY 10018  
Check your phone listings for the local authorities having  
jurisdiction over your installation.  
Consumer Responsibilities  
Figure 1  
Heat Pump Water Heater Basic Operation  
This manual has been prepared to acquaint you with the  
installation, operation and maintenance of your electric heat  
pump water heater and to provide important safety information  
in these areas.  
Cool/Dehumidified Air  
Ambient Air  
Heat Pump  
(Transfers heat  
from ambient  
air to Heat  
We urge you to read all of the instructions thoroughly before  
attempting the installation or operation of this water heater.  
This manual should be kept for future reference.  
The manufacturer of this water heater will not be liable for any  
damages caused by failure to comply with the installation and  
operating instructions outlined in this manual.  
Exchanger)  
Upper Element  
(4500 Watt)  
Water Tank  
Jacket  
If you lack the necessary skills required to properly install this  
water heater or you have difculty following the directions, you  
should not proceed but have a qualied person perform the  
installation of this water heater.  
Examples of a qualified person include: licensed plumbers,  
authorized electric company personnel, and authorized  
service personnel.  
Heat Exchanger  
(Heat Transfer Coils)  
Massachusetts code requires this water heater to be installed  
in accordance with Massachusetts 248-CMR 2.00: State  
Plumbing Code and 248-CMR 5.00.  
Lower Element  
(2000 Watt)  
A data plate identifying your water heater can be found  
adjacent to the upper element door. When referring to your  
water heater always have the information listed on the data  
plate readily available, to include the model and serial number.  
Retain your original receipt as proof of purchase.  
Unpacking the Water Heater  
WARNING  
Excessive Weight Hazard  
Basic Operation Fundamentals  
Use two or more people to move and install  
water heater.  
The Heat Pump Water Heater (HPWH) is an integrated  
heat pump water heater unit, having an 850 watt  
Failure to do so can result in back or  
other injury.  
compressor and external coil heat exchanger with backup  
electric elements (See Figure 1). When in Efciency Mode  
the heat pump draws heat from the ambient air in the room  
and transfers it to the water in the tank through the coil  
heat exchanger. While in Electric Mode the water heater  
functions like a standard electric water heater, relying on  
the electric elements to heat the water. A Hybrid Mode is  
available that relies primarily on the heat pump to heat  
Removing Packaging Materials  
IMPORTANT: Do not remove, cover or deface any  
permanent instructions, labels, or the data label from either  
the outside of the water heater or on the inside of water  
heater panels.  
3
 
The water heater must NOT be placed on its side. It  
should be transported and stored in an upright position.  
Remove exterior packaging and place installation  
components aside.  
Inspect all parts for damage prior to installation and  
start-up.  
Completely read all instructions before attempting to  
assemble and install this product.  
After installation, dispose of/recycle all packaging  
materials.  
IMPORTANT: The water heater should be located in an  
area where leakage of the tank, connections, condensate  
lines or condensate will not result in damage to the area  
adjacent to the water heater or to lower floors of the  
structure. Due to the normal corrosive action of the water,  
the tank will eventually leak after an extended period of  
time. Also, any external plumbing leak, including those  
from improper installation, may cause early failure of the  
tank due to corrosion if not repaired. If the homeowner is  
uncomfortable with making the repair a qualified person  
should be contacted. A suitable metal drain pan should be  
installed under the water heater as shown below, to help  
protect the property from damage which may occur from  
condensate formation or leaks in the piping connections  
or tank. The pan must limit the water level to a maximum  
depth of 2-1/2 inches and be two inches wider than the  
heater and piped to an adequate drain. Locate the water  
heater near a suitable indoor drain. Outside drains are  
subject to freezing temperatures which can obstruct  
the drain line. The piping should be at least 3/4” ID and  
sloped for proper drainage. Under no circumstance will the  
manufacturer or seller of this water heater be held liable  
for any water damage which is caused by your failure to  
follow these instructions.  
Location Requirements  
Site location  
Select a location near the center of the water piping system.  
The unit must be installed indoors and in a vertical position  
on a level surface. The ooring beneath the water heater  
must be able to support the weight of the water heater when  
lled with water (967 lbs. full).  
IMPORTANT: The water heater must be located in a space  
750 cubic feet or larger, and must have unrestricted airow.  
As an example, a room that has an 8 foot tall ceiling and is  
10 feet long by 9-1/2 feet wide would contain 760 cubic feet.  
NOTE: For optimal efciency and serviceability, the  
following clearances should be maintained: 3 feet on the air  
inlet side, 5 feet. on the air outlet side, 6 inches in the back,  
and 2 feet in the front.  
Figure 2  
Metal Drain Pan  
Installation  
The water heater should be located in an area not  
subject to freezing temperatures. Water heaters located  
in unconditioned spaces (i.e., garages, basements, etc.)  
may require the water piping, condensate piping, and drain  
piping to be insulated to shelter against freezing. The drain  
and controls must be easily accessible for operation and  
service.  
METAL  
DRAIN  
PAN  
PIPED TO AN  
ADEQUATE DRAIN  
AT LEAST 2” GREATER THAN THE  
DIAMETER OF THE WATER HEATER.  
The site location must be free from any corrosive elements  
in the atmosphere such as sulfur, uorine, and chlorine.  
These elements are found in aerosol sprays, detergents,  
bleaches, cleaning solvents, air fresheners, paint, and  
varnish removers, refrigerants, and many other commercial  
and household products. In addition, excessive dust and  
lint may affect the operation of the unit (See “Cleaning the  
Filter” section).  
NOTE: The water heater shall be located so it is not subject  
to physical damage by moving vehicles or area ooding.  
Figure 3  
Residential Garage  
Installation  
The ambient air temperature must also be considered  
when installing this unit. In Efciency Mode the ambient air  
temperature must be above 45°F and below 109°F. If the  
ambient air temperature falls outside these upper and lower  
limits the electrical elements will activate to meet the hot  
water demand and the heat pump does not operate.  
Vehicle  
Stop  
NOTE: Local codes and requirements in your area may  
require the installation of your water heater be accomplished  
in a way that the bottom element is elevated from the  
oor at least 18 inches. Ensure that a platform capable of  
supporting the combined weight of the water heater and  
water (967-pounds) is used.  
Drain  
Pan  
Drain  
State of California  
NOTE: The water heater must be braced, anchored, or  
strapped to avoid moving during an earthquake. Contact  
local utilities for code requirements in your area, visit  
request instructions.  
4
 
3. Some local codes may require, and the manufacturer  
of this water heater recommends, installing a mixing  
valve or an anti-scald device in the domestic hot water  
line as shown in Figure 4. These valves reduce the  
point-of-use temperature of the hot water by mixing  
cold and hot water and are readily available. Contact  
a licensed plumber or the local plumbing authority for  
more information.  
4. Some local codes may require, and the manufacturer  
of this water heater recommends, installing a pressure  
reducing valve (PRV) in the cold water inlet line where  
it enters the residence as shown in Figure 4.  
Water System Piping  
Piping, ttings, and valves should be installed according to  
the installation drawing (Figure 4). If the indoor installation  
area is subject to freezing temperatures, the water piping  
must be properly insulated.  
Water supply pressure should be 50-60 PSIG and not  
exceed the maximum 80 PSIG. If the supply line pressure  
exceeds 80 PSIG, a pressure reducing valve (PRV) with  
a bypass should be installed in the cold water supply line.  
This should be placed on the supply to the entire house in  
order to maintain equal hot and cold water pressures.  
5. If installing the water heater in a closed water system,  
install an expansion tank in the cold water line as  
specified under “Closed System/Thermal Expansion.”  
6. Install a shut off valve in the cold water inlet line. It  
should be located close to the water heater and be  
easily accessible. Know the location of this valve and  
how to shut off the water to the heater.  
7. Install a discharge line from the temperature and  
pressure relief valve in the opening marked “T & P  
RELIEF VALVE”. See Figure 5 and the “Temperature  
and Pressure Relief Valve” section.)  
8. After piping has been properly connected to the water  
heater, open the nearest hot water faucet. Then open  
the cold water shut off valve and allow the tank to  
completely fill with water. To purge the lines of any  
excess air and sediment, keep the hot water faucet  
open for 3 minutes after a constant flow of water is  
obtained. Close the faucet and check all connections  
for leaks.  
IMPORTANT:  
Heat must not be applied to the water fittings on  
the heater as they may contain nonmetallic parts. If  
solder connections are used, solder the pipe to the  
adapter before attaching the adapter to the hot and  
cold water fittings.  
Always use a good grade of joint compound and be  
certain that all fittings are tight.  
IMPORTANT: DO NOT over apply joint compound.  
Piping Installation  
1. Install the water piping and fittings as shown in Figure  
4. Connect the cold water supply (3/4” NPT) to the  
fitting marked “Cold”. Connect the hot water supply  
(3/4” NPT) to the fitting marked “Hot”.  
2. The installation of unions in both the hot and cold  
water supply lines are recommended for ease of  
removing the water heater for service or replacement.  
Figure 4  
Water Piping Installation  
with Mixing Valve  
Heat Trap - The top of the heat trap  
must be higher than the storage tank  
of the water heater.  
Massachusetts: Install a vacuum relief in cold  
water line per section 19 MGL 142.  
Vacuum Relief Valve  
Cold Water  
Inlet Valve  
Union  
Union  
Shut-off Valve (Hot)  
Temperature and  
Pressure Relief Valve  
Cold Water  
Inlet  
Untempered Water Outlet  
Hot  
(Outlet)  
Whole House Pressure Reducing  
Valve (PRV) should be installed  
where the water supply enters  
the residence.  
Mixing Valve (Optional) - Follow the  
Mixing Valve’s Manufacturer’s Installation  
Instructions. (Set to 120° F)  
Tempered Water to Fixtures  
Condensate Drain Lines*  
Discharge Pipe  
(Do Not Cap or Plug)  
Cold Water Outlet  
In a closed system, use a  
thermal expansion tank.  
See “Closed System/  
Thermal Expansion”  
section.  
Metal Drain Pan 2 1/2”  
Depth Maximum and  
2 Inches wider than  
the water heater.  
Cold  
(Inlet)  
Shut-off Valve  
(Cold)  
Drain Line 3/4”  
ID Minimum  
6” Maximum  
Air Gap  
Drain  
* If an adequate drain is not available for the condensate drain lines then a condensate pump should be used. DO NOT discharge the condensate drain  
lines into the metal drain pan.  
5
 
Please note the following:  
Closed System/Thermal Expansion  
The system should be installed only with piping that is  
suitable for potable (drinkable) water such as copper,  
CPVC, or polybutylene. This water heater must not be  
installed using iron piping or PVC water piping.  
WARNING  
Use only pumps, valves, or fittings that are compatible  
with potable water.  
Use only full flow ball or gate valves. The use of valves  
that may cause excessive restriction to water flow is  
not recommended.  
Explosion Hazard  
Use only 95/5 tin-antimony or other equivalent solder.  
Any lead based solder must not be used.  
If the temperature and pressure relief valve  
is dripping or leaking, have a qualified  
person replace it.  
Piping that has been treated with chromates, boiler  
seal, or other chemicals must not be used.  
Chemicals that may contaminate the potable water  
supply must not be added to the piping system.  
Examples of a qualified person include:  
licensed plumbers, authorized electric  
company personnel, and authorized service  
personnel.  
Condensate Drain Line Installation  
Install two 1/2” PVC discharge lines from the condensate  
drains (located on the right side near the back). The lines  
should terminate a maximum of six inches above an  
adequate drain. Do not discharge the condensate drain  
lines into the metal drain pan. If no floor drain is available  
or the drain is above the level of the condensate line, a  
condensate pump should be installed. These pumps are  
available from local distributors.  
Do not plug valve.  
Do not remove valve.  
Failure to follow these instructions can  
result in death or explosion.  
When installing the drain line, note the following:  
Most public water systems in North America are required  
to prevent water flowing from points of use (residences,  
businesses, etc.) back into the supply system in order  
to maintain water quality. To accomplish this, back flow  
preventers such as check valves, are installed in the water  
line going to each point of use. Typically the back flow  
preventer will be installed at the water meter or inside a  
building where the supply line enters the building. This  
device allows water to flow into the residence but does  
not allow it to flow back into the water supply. This creates  
what is known as a “Closed System”. As water is heated  
by the water heater, the water in the system attempts to  
expand, but has nowhere to go resulting in an increase  
in pressure. This increase in pressure in the system may  
cause the temperature-pressure relief valve to open to  
relieve the pressure. Water will drip from the temperature  
and pressure relief valve. Premature tank failure will result  
if this condition is not corrected. To prevent this condition, a  
properly-sized thermal expansion tank should be installed  
in the cold water supply to the water heater as shown in  
Figure 4. Failure to install a properly sized expansion tank  
in a closed system will void the warranty on the water  
heater in the event of tank failure. It is important to follow  
the thermal expansion tank manufacturers’ installation  
instructions and to adjust the expansion tank pressure  
to match the water supply pressure. Contact a plumbing  
service agency or your retail supplier regarding the  
installation of a thermal expansion tank.  
Plastic pipe or tubing must be used to connect the  
condensate drain to a suitable drain or condensate  
pump.  
Condensate drain lines should be installed in  
conditioned areas only. Install approved insulation on  
the condensate drain lines to prevent condensation  
from forming on the outside of the drain lines.  
Condensation drain lines installed in areas that are  
subject to freezing temperatures should be wrapped  
with a nationally recognized/listed heat tape. Install per  
manufacturer’s instructions.  
Do not connect condensate drain lines with other drain  
or discharge lines into a single (common) pipe or line.  
Each line (condensate drain line, temperature and  
pressure relief valve discharge pipe, etc) should be  
independently run to an adequate drain.  
Slope the condensate drain lines toward the inside  
floor drain or condensate pump.  
The condensate drain lines and connections to the  
drain piping must comply with all local codes.  
Use appropriate primer and glue to cement the  
condensate drain lines to the heat pump drain pan.  
NOTE: The heat pump drain pan is ABS and the two  
condensate drain pipes should be PVC.  
If a condensate pump is installed it should shut off  
the heat pump in the event the condensate pump  
fails or the float switch in the pump activates (See  
“Condensate Pump Installation” section.)  
6
 
To reduce the risk of excessive pressures and temperatures  
in this water heater, install temperature and pressure relief  
protective equipment required by local codes, but no less  
than a combination temperature and pressure relief valve  
certied by a nationally recognized testing laboratory that  
maintains periodic inspection of the production of listed  
equipment or materials, as meeting the requirements for  
Relief Valves and Automatic Shutoff Devices for Hot Water  
Supply Systems, ANSI Z21.22 - latest edition. This valve  
must be marked with the maximum set pressure not to  
exceed the marked maximum working pressure of the  
water heater. Install the valve into an opening provided  
and marked for this purpose in the water heater, and orient  
it or provide tubing so that any discharge from the valve  
exits only within 6 inches above drain, or at any distance  
below, the structural oor, and does not contact any live  
electrical part. The discharge opening must not be blocked  
or reduced in size under any circumstance.  
Temperature and Pressure  
Relief Valve  
WARNING  
Explosion Hazard  
If the temperature and pressure relief valve  
is dripping or leaking, have a qualified  
person replace it.  
Examples of a qualified person include:  
licensed plumbers, authorized electric  
company personnel, and authorized service  
personnel.  
IMPORTANT: Only a new temperature and pressure relief  
valve should be used with your water heater. Do not use an  
old or existing valve as it may be damaged or not adequate  
for the working pressure of the new water heater. Do not  
place any valve between the relief valve and the tank.  
The Temperature & Pressure Relief Valve:  
Do not plug valve.  
Shall not be in contact with any electrical part.  
Shall be connected to an adequate discharge line.  
Shall not be rated higher than the working pressure  
shown on the data plate of the water heater.  
Do not remove valve.  
Failure to follow these instructions can  
result in death or explosion.  
The Discharge Line:  
Shall not be smaller than the pipe size of the relief  
valve or have any reducing coupling installed in the  
discharge line.  
Shall not be capped, blocked, plugged or contain  
any valve between the relief valve and the end of the  
discharge line.  
Shall terminate a maximum of six inches above a floor  
drain or external to the building. In cold climates, it is  
recommended that the discharge pipe be terminated at  
an adequate drain inside the building.  
Figure 5  
Temperature and Pressure  
Relief Valve Installation  
Temperature and  
Pressure Relief Valve  
Shall be of material listed for hot water distribution.  
Shall be installed to allow complete drainage of both  
the valve and discharge line.  
Discharge Pipe  
(Do Not Plug or Cap)  
Temperature/Pressure Relief Valve and  
Pipe Insulation  
1. Locate the temperature and pressure relief valve on the  
water heater (also known as a T&P relief valve). See  
Figure 5.  
Drain Pan 2 1/2”  
Depth Maximum and  
2 Inches wider than  
the water heater.  
2. Locate the slit running the length of the T&P relief valve  
insulation.  
3. Spread the slit open and t the insulation over the T&P  
relief valve. See Figure 6. Apply gentle pressure to the  
insulation to ensure that it is fully seated on the T&P Re-  
lief Valve. Once seated, secure the insulation with duct  
tape, electrical tape, or equivalent.  
Drain Line 3/4”  
ID Minimum  
6” Maximum  
Air Gap  
Drain  
For protection against excessive pressures and  
temperatures, a temperature and pressure relief valve must  
be installed in the opening marked “T & P RELIEF VALVE”  
(See Figure 5).  
IMPORTANT: The insulation and tape must not block  
the discharge opening or hinder access to the manual  
relief lever (Figure 6). Ensure a discharge pipe is in-  
stalled into the T&P valve discharge opening per the  
instructions in this manual.  
7
 
If you lack the necessary skills required to properly install the  
electrical wiring to this water heater, do not proceed but have a  
qualied electrician perform the installation.  
Figure 6  
T&P Relief Valve Insulation  
When making the electrical connections, always make sure:  
T&P Relief Valve Insulation  
The electrical service provides 240 VAC to the water heater  
for proper operation. DO NOT use 208 VAC.  
Wire sizes and connections comply with all applicable  
codes or in the absence of local or state codes follow  
NFPA-70, the National Electrical Code-current edition.  
Wiring enclosed in approved conduit (if required by local  
codes).  
Manual Relief Lever  
The water heater and electrical supply are properly  
grounded.  
T&P Relief Valve  
The electrical supply has the proper overload fuse or  
breaker protection.  
T&P Relief Valve  
Drain Line  
Figures 8A & 9 are provided as reference drawings. Always  
reference the wiring diagram located on the water heater for the  
correct electrical connections and connect the electrical supply  
to the water heater in accordance with local utility requirements  
and codes.  
When installing the electrical wiring to the water heater:  
1. Although this water heater is equipped with “Dry Fire”  
protection circuitry, be sure tank is completely filled with  
water, and all air is purged from the tank before making  
any electrical connections. See “Draining and Flushing  
Section”.  
4. Locate the hot water (outlet) & cold water (inlet) pipes  
to the water heater.  
5. Locate the slit running the length of a section of pipe  
insulation.  
6. Spread the slit open and slip the insulation over the  
cold water (inlet) pipe. Apply gentle pressure along the  
length of the insulation to ensure that it is fully seated  
around the pipe. Also, ensure that the base of the  
insulation is ush with the water heater. Once seated,  
secure the insulation with duct tape, electrical tape, or  
equivalent.  
2. Turn off power to the electrical wiring for the water heater at  
the circuit breaker/fuse box.  
3. Remove the left louvered access panel (when facing the  
water heater) by loosening the screws securing it to the  
water heater.  
4. Loosen the screws securing the electrical junction box  
Figure 7  
7. Repeat steps 5 and 6 for the hot water (outlet) pipe.  
8. Add additional sections of pipe insulation as needed.  
Louvered Panel  
Electrical Requirements  
WARNING  
Electric Shock Hazard  
Disconnect power before  
servicing.  
cover to the water heater and set aside.  
Replace all parts and panels  
before operating.  
5. Connect the electrical supply to the water heater.  
A standard 1/2 inch opening has been made in the junction  
box for conduit connections.  
Failure to do so can result in  
death or electrical shock.  
6. Connect ground wire to green ground wire in the electrical  
junction box of the water heater.  
7. Reinstall the junction box cover.  
8. Reattach the left louvered access panel to the water heater  
and secure it using the screws loosened earlier.  
9. Turn on electrical power to the water heater.  
10. Press the power button to turn the water heater on, then  
press the Efficiency button to set the operating mode.  
NOTE: The water heater will conduct a system diagnostic  
(approximately 8 minutes) prior to returning to operation.  
11. Once the diagnostic sequence has finished, the fan should  
turn on.  
WARNING  
Fire Hazard  
Use 10 gauge solid copper  
wire.  
Use a UL listed or  
CSA approved strain relief.  
NOTE: The heat pump’s fan will not turn on if the incoming  
water temperature is less than 59 °F and/or the ambient  
air temperature is above 109 °F or below 45 °F. Should the  
internal diagnostics detect a problem with the heat pump,  
an error message will be displayed.  
Connect ground wire to green  
ground wire.  
12. Set the operational mode. For standard installation, the  
Hybrid Mode offers the best combination of efficiency  
and hot water delivery. For detailed descriptions of all  
operational modes see “Adjusting the User Interface  
Module/Operational Modes” section.  
Failure to do so can result in  
death, fire, or electrical shock.  
8
 
5. Connect these two wires to the two wires on the water  
heater using wire nuts or other connectors.  
Figure 8A  
Junction Box  
6. Connect the free ends of the two wires to the shut off  
switch on the condensate pump in accordance with the  
manufacturers recommendations.  
Green  
Ground  
Wire  
7. Turn on electrical power to the water heater.  
Ground  
Wire  
8. Press the power button to turn the water heater on and  
select the desired operational mode. After about 8  
minutes, the heat pump will turn on.  
Black Wire  
Red Wire  
Conduit  
(Field Connection)  
9. Test the operation of the shut off switch by unplugging  
the condensate pump and filling the condensate  
reservoir with water until the float switch opens the  
circuit.  
10. The heat pump should turn off and the error code  
“CONDENSATE DRAIN ALARM “will appear on the  
user interface screen.  
Figure 8B  
Condensate Pump Wiring  
11. Plug the condensate pump in and verify that the pump  
operates and pumps the water out of the condensate  
reservoir.  
Condensate Pump Wiring Loop  
18 AWG - White  
(Loop Located Behind Junction Box)  
12. The error on the user interface should clear and the  
heat pump should operate after 8 minutes.  
Insulation Blankets  
The use of an insulation blanket on this water heater is not  
needed or recommended. The purpose of an insulation  
blanket is to reduce the standby heat loss encountered with  
storage tank heaters. Your 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.  
White Wires  
From Water Heater  
Wires to Condensate  
Pump Overflow  
Shut Off Switch  
(18 AWG or Larger)  
Figure 9  
Wiring Diagram  
Overload  
Protection  
Circuit  
Breaker  
Approved Connectors  
Red  
L1  
L2  
Black  
To 240v  
1 Phase  
Power supply  
Green  
Ground  
Wire  
Electrical  
Service ground  
Connecting the Condensate Pump  
Overow Shut Off Switch  
1. Turn off power to the electrical wiring for the water  
heater at the circuit breaker/fuse box.  
2. Locate the white 18 AWG wire loop behind the field  
wiring junction box. See Figure 8B.  
3. Cut the loop and strip insulation off of the two ends.  
4. Measure the distance from the field wiring junction box  
to the condensate pump, and cut two 18 AWG or larger  
wires to correct length and strip the insulation at both  
ends of each wire. See Figure 8B.  
9
 
INSTALLATION CHECKLIST  
Condensate Drain Line Installation  
Water Heater Location  
Must be located with access to an adequate drain or  
Centrally located with the water piping system.  
condensate pump.  
The ooring beneath the water heater must be able to  
support the weight of the water heater when lled with  
water (967 lbs. full).  
Condensate drain lines installed and piped to an  
adequate drain or condensate pump (See Figure 4).  
Located indoors (such as a basement or garage)  
and in a vertical position. Sheltered from freezing  
temperatures.  
Electrical Connections  
The water heater requires 240 VAC for proper  
operation.  
Provisions made to shelter the area from water  
damage. Metal drain pan installed and piped to an  
adequate drain.  
Wiring size and connections comply with all applicable  
codes or in the absence of local or state codes follow  
NFPA-70, the National Electrical Code-current edition.  
Sufficient room to service the water heater.  
Water heater and electrical supply are properly  
grounded.  
Sufficient air for the heat pump to function. The water  
heater must be located in a space 750 cubic feet or  
larger, and must have unrestricted airow. As an  
example, a room that has an 8 foot tall ceiling and is  
10 feet long by 9-1/2 feet wide would contain 760 cubic  
feet.  
NOTE: For optimal efciency and serviceability, the  
following clearances should be maintained: 3 feet on  
the air inlet side, 5 feet on the air outlet side, 6 inches in  
the back, and 2 feet in the front.  
Wiring enclosed in approved conduit (if required by  
local codes).  
Proper overload fuse or circuit breaker protection  
installed.  
Post Installation Review  
Understand how to use the User Interface Module to  
set the various modes and functions (See “Adjusting  
the User Interface Module/Operating Modes” section).  
The unit cannot be placed into any type of closet or  
small enclosure.  
Hybrid Mode is the recommended Operating Mode.  
Understand the various Operating Modes and which  
mode may be best based on season, ambient  
temperature, and usage (See “Operating Mode  
Description” section).  
The site location must be free from any corrosive  
elements in the atmosphere such as sulfur, uorine,  
and chlorine. These elements are found in aerosol  
sprays, detergents, bleaches, cleaning solvents, air  
fresheners, paint, and varnish removers, refrigerants,  
and many other commercial and household products.  
In addition excessive dust and lint may affect the  
operation of the unit and require more frequent  
cleaning (See “Cleaning the Heat Pump” section).  
NOTE: It may be necessary to temporarily change  
modes if for example filling a spa or hot tub.  
Understand the importance of routine inspection/  
maintenance of the condensate drain pan and lines  
(See “Inspection/Cleaning of the Condensate Drain  
Pan & Condensate Drain Lines” section). This is to  
help prevent any possible drain line blockage resulting  
in the condensate drain pan overflowing.  
Ambient air temperature must be above 45°F and  
below 109°F. If the ambient air temperature falls  
outside these upper and lower limits the electrical  
elements will activate to meet the hot water demand.  
IMPORTANT: Water coming from the plastic shroud is  
an indicator that both condensation drain lines may be  
blocked. Immediate action is required.  
Water System Piping  
Temperature and pressure relief valve properly  
installed with a discharge pipe run to an adequate drain  
and sheltered from freezing (See Figure 5).  
To maintain optimal operation check, remove and clean  
the air filter (See “Air Filter Cleaning/Replacement”  
section).  
All piping properly installed and free of leaks.  
The Installation Instructions and Use & Care Guide  
should be kept with the water heater for reference.  
Heater completely filled with water (See “Water Piping  
System” section).  
Closed system pressure buildup precautions installed  
(See “Closed System/Thermal Expansion” section).  
Mixing valve (when applicable) installed per  
manufacturer’s instructions (See “Water Temperature  
Regulation” section).  
10  
 
OPERATING YOUR WATER HEATER  
Before Using  
Water Temperature Regulation  
1. Make sure the water heater has been properly  
installed. See “Installing Your Water Heater” section.  
2. Make sure the air filter is correctly seated, as it may  
shift during shipping or installation. See “Repair Parts  
Illustration” section.  
WARNING  
3. Completely fill the tank with water (See “Water Piping”  
section).  
4. After the water heater tank is completely filled with water,  
connect electrical power to the water heater.  
5. Read the “Water Temperature Regulation” section of this  
manual. If you do not fully understand these instruction,  
contact a qualied person.  
6. Press the power button (See Figure 10) to turn the water  
heater on and allow it to run a system diagnostic. This  
typically takes eight minutes. Once complete, proceed to  
the next step.  
NOTE: If the system diagnostic yields any codes,  
reference the Diagnostic Code section in this manual.  
7. Adjust the thermostat to the desired temperature  
setting as described under “Adjusting the User Interface  
Module/Operational Modes” section.  
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.  
Feel water before bathing or showering.  
Temperature limiting valves are available.  
The water heater is adjusted to a temperature setting of  
no higher than 120°F when it is shipped from the factory.  
Water temperature can be regulated by adjusting the User  
Interface Module to the preferred setting as shown in  
“Adjusting the User Interface Module/Operational Mode”  
The preferred starting point is 120°F. There is a hot water  
scald potential if the temperature set point is set too high.  
IMPORTANT: Do not attempt to operate this water heater  
if the unit has been submerged, subjected to ooding, or  
surrounding insulation has been exposed to water in any  
way.  
Do not attempt to repair a unit subjected to ood conditions.  
Water heaters subjected to ood conditions or any time the  
unit has been submerged in water require replacement of  
the entire water heater.  
IMPORTANT: Adjusting the set point above 120°F on the  
User Interface Module will increase the risk of scald injury in  
the times shown below.  
Safety Shut-off (ECO)  
Table 1  
This water heater is designed to automatically shut-off in the  
event that the water temperature exceeds 190°F or 87.8°C.  
A temperature limit switch or ECO (Energy Cut Off) is used  
to shut off the power to the system if the water temperature  
exceeds 190°F or 87.8°C (See “Water Temperature  
Regulation” section). To reset the ECO disconnect power at  
the circuit breaker/fuse box then remove the upper access  
panel. Reset the ECO by rmly pushing in the red reset  
button located on the ECO block. If the ECO continues  
to shut-off the water heater contact a qualied person for  
service.  
Time for  
Time for 1st  
Water  
Permanent Burns  
2nd & 3rd Degree  
(Most Severe Burns)  
Degree Burn  
Temperature °F  
(Less Severe Burns)  
110  
116  
116  
122  
131  
140  
149  
154  
(normal shower temp.)  
(pain threshold)  
35 minutes  
45 minutes  
5 minutes  
25 seconds  
5 seconds  
2 seconds  
1 seconds  
1 minute  
5 seconds  
2 seconds  
1 second  
instantaneous  
(U.S. Government Memorandum, C.P.S.C., Peter L. Armstrong, Sept. 15,1978)  
NOTE: During low demand periods when hot water is not  
being used, a lower temperature set point will reduce energy  
losses and may satisfy your normal hot water needs. If hot  
water use is expected to be more than normal, a higher  
temperature set point may be required to meet the increased  
demand.  
When leaving your home for extended periods (vacations,  
etc.) set the water heater to Vacation Mode. See “Adjusting the  
User Interface Module/Operational Modes” section. This will  
maintain the water at low temperatures with minimum energy  
losses and prevent the tank from freezing during cold weather.  
NOTE: When returning from an extended stay remember to  
set the water heater back to the desired Operational Mode.  
11  
 
Adjusting the User Interface Module/Operational Modes  
Water Temperature Adjustment  
Other Controls  
The water temperature can be adjusted from 95°F to 150°F.  
Lock - Holding this button for more than 3  
Use the Up and Down Buttons  
panel to set the desired temperature.  
on the front  
seconds switches the lock mode on or off. When  
the User Interface Module is locked a symbol  
and “Lock” text will be visible on the display (see  
Figure 10).  
IMPORTANT: Before attempting to adjust the thermostat,  
read the “Water Temperature Regulation” section. If the  
instructions are not clear, contact a qualied person.  
°F/°C  
°F/°C - The button switches the display to show  
the set temperature in Fahrenheit or Celsius.  
IMPORTANT: Filling a spa or hot tub from this water heater  
may result in extended recovery/re-heat time. Switching  
(temporarily) to Hybrid Mode or Electric Mode will decrease  
the recovery/re-heat time. Be sure to switch back to the  
desired operational mode when nished.  
Figure 10 User Interface Module  
Operational Mode Buttons  
Operating Mode Descriptions  
The operating modes can be changed by touching the  
desired mode icon on the User Interface Module (see  
Figure 10.)  
NOTE: All buttons on the User Interface are touch sensitive  
and require only a light touch to actuate.  
EFFICIENCY  
HYBRID  
ELECTRIC  
VACATION  
Water  
Temperature  
Set Point  
Element  
Functioning  
Icon  
F
Water Heater  
Mode/Status  
Indicator  
Efciency Mode - Is the most energy efcient  
EFFICIENCY  
mode. This mode uses the heat pump to heat water  
in the tank. The elements are not used unless the  
ambient operating temperature is below 45°F or  
above 109°F. If hot water demands are not met in  
Efciency Mode it may be necessary to switch to  
Hybrid Mode.  
Water Heater  
Efficiency Status  
Icon  
Heat Pump  
Functioning  
Icon  
HEAT PUMP  
ELEMENT  
EFFICIENCY  
LOCK  
LCD Control  
Panel Lock Icon  
°F/°C  
Hybrid Mode (recommended setting) - Combines  
high energy efciency with reduced recovery time.  
HYBRID  
Temperature  
Up (Increase)  
Button  
Temperature  
Down (Decrease)  
Button  
This mode uses the heat pump as the primary  
heating source. The heating element will heat  
water if demand exceeds a predetermined level so  
that the set point temperature can be recovered  
more quickly.  
Fahrenheit/Celsius  
Temperature Display  
Button  
LCD Display Panel  
Lock Button  
Power Button: On - Green  
Standby - Red  
Electric Mode - The water heater functions as a  
ELECTRIC  
conventional electric unit, relying totally on the  
elements to heat the water in the tank. This mode  
may be useful in winter to eliminate the output of  
cold air from the unit.  
Vacation Mode - The controller adjusts the water  
VACATION  
temperature to approximately 60°F. This mode is  
recommended when the water heater is not in use  
for a long period of time. This mode minimizes  
energy consumption and prevents the water heater  
from freezing during cold weather.  
12  
 
Water Heater Sounds  
During the normal operation of the water heater, sounds or  
noises may be heard. These noises are common and may  
result from the following:  
Operational Conditions  
Powered Anode Operation  
To shelter the glass-lined water tank from corrosion  
through electrolysis, this water heater is equipped with a  
non-sacrificial powered anode which should not need to be  
replaced under normal operating conditions.  
1. Normal expansion and contraction of metal parts  
during periods of heat-up and cool-down.  
2. Sediment buildup on or around the elements could  
create varying amounts of noise and may cause  
premature tank failure. Drain and flush the tank as  
directed under the “Draining and Flushing” section.  
If the powered anode malfunctions it should be replaced by  
a qualified technician.  
IMPORTANT: If a faulty powered anode is not repaired or  
has been removed permanently, then all warranties are  
void.  
3. The heat pump compressor or fan running.  
Stacking  
Stacking occurs when a series of short draws of hot water  
(3 gallons or less) are taken from the water heater tank.  
This causes increased cycling of the heat pump and/  
or heater elements and can result in increased water  
temperatures at the hot water outlet. An anti-scald device  
is recommended in the hot water supply line to reduce the  
risk of scald injury.  
13  
 
MAINTENANCE OF YOUR WATER HEATER  
1. Place the water heater in Standby Mode by pressing  
Temperature and Pressure  
the power button on the user interface module.  
2. Turn off the power to the water heater at the circuit  
Relief Valve  
breaker/fuse box.  
3. Open a nearby hot water faucet until the water is no  
longer hot.  
4. Close the cold water inlet valve.  
5. Connect a hose to the drain valve and terminate it to an  
adequate drain or external to the building.  
WARNING  
6. Open the water heater drain valve and allow all of the  
water to drain from the tank. Flush the tank with water  
as needed to remove sediment.  
7. Close the drain valve, rell the tank (open the cold  
water inlet valve), and restart the heater as directed in  
Explosion Hazard  
this manual.  
IMPORTANT: Do not turn on power to the water heater  
unless it is completely lled with water. To ensure that  
the tank is full, open a hot water faucet and allow the  
water to run until the air is purged and the water ows  
uninterrupted from the faucet.  
If the temperature and pressure relief valve  
is dripping or leaking, have a qualified  
person replace it.  
8. Press the power button to turn the water heater on.  
NOTE: The water heater will conduct a system  
diagnostic prior to operation.  
Examples of a qualified person include:  
licensed plumbers, authorized electric  
company personnel, and authorized service  
personnel.  
If the water heater is going to be shut down for an extended  
period, the drain valve should be left open.  
Do not plug valve.  
Heating Element Replacement  
Do not remove valve.  
WARNING  
Failure to follow these instructions can  
result in death or explosion.  
Electric Shock Hazard  
Manually operate the temperature and pressure relief valve  
at least once a year to make sure it is working properly.  
To prevent water  
Disconnect power before  
servicing.  
Figure 11  
damage, the valve  
must be properly  
connected to a  
Replace all parts and panels  
before operating.  
Temperature and Pressure  
Relief Valve  
Manual Relief  
discharge line which  
terminates at an  
adequate drain.  
Standing clear of the  
outlet (discharged  
water may be  
hot), slowly lift and  
release the lever  
handle on the  
Valve  
Failure to do so can result in  
death or electrical shock.  
Replacement heating elements must be of the same style  
and voltage/wattage rating as the ones originally in the water  
heater. This information can be found on the ange or terminal  
block of the element or on the water heater data plate.  
Discharge line to drain  
IMPORTANT: Before replacing any element conrm that  
temperature and  
you have the correct replacement element (wattage). This  
pressure relief valve to allow the valve to operate freely and water heater has a 4500 watt upper element and a 2000  
return to its closed position. If the valve fails to completely  
reset and continues to release water, immediately  
disconnect the electrical power, close the cold water inlet  
valve and call a qualied person.  
watt lower element. DO NOT replace the element(s) with a  
wattage different than the ones specied for the upper and/  
or lower element.  
IMPORTANT: Using an element greater than 2000 watts  
in place of the lower element will damage the water heater  
and void the warranty.  
1. Press the power button on the user interface module to  
place the water heater in Standby Mode.  
2. Turn off the power to the water heater.  
3. Drain the water heater as directed in the “Draining  
and Flushing” section.  
Draining and Flushing  
It is recommended that the tank be drained and ushed  
every 6 months to remove sediment which may build up  
during operation. The water heater should be drained if  
being shut down during freezing temperatures. To drain the  
tank, perform the following steps:  
14  
 
Routine Preventive Maintenance  
Figure 12:  
At least monthly, a visual inspection should be made of the  
following:  
Wires  
Air Filter (Remove and inspect, clean if needed, and  
reinstall).  
Element  
Condensate drain pan and condensate lines.  
The lower metal drain pan for standing water which may  
indicate a clogged condensate drain pan, condensate  
lines, or plumbing leak.  
Leaking or damaged water piping.  
Screws  
Presence of corrosive materials in the installation area.  
Presence of combustible materials near the water heater.  
After servicing this water heater, check to make sure it  
is working properly. (See “Operating Your Water Heater”  
section of this manual.)  
4. Remove the access cover(s), then remove the foam  
insulation block.  
5. Remove the protective plastic cover(s) over the  
elements from their attachment point.  
IMPORTANT: If you lack the necessary skills required to  
properly perform this visual inspection, you should not  
proceed, but get help from a qualified person.  
6. Disconnect the electrical wires from the heating  
element(s) by loosening the screws (Figure 12).  
Remove the screw-in element(s) by turning the  
element(s) counterclockwise with a 1-1/2 inch socket  
wrench. Remove the existing gasket(s).  
7. Clean the area where the gasket(s) fits to the tank  
and internal threads. If you are replacing the bottom  
element, remove any accumulated sediment on the  
bottom of the tank.  
8. Make sure the replacement element(s) has the correct  
voltage and wattage rating by matching it to the rating  
plate on the water heater. Position the new gasket(s)  
on the element and insert it into the water heater tank  
(Figure 13).  
Cleaning the Heat Pump  
Air Filter Cleaning/Replacement  
IMPORTANT: Before attempting to clean or replace the air  
lter press the power button to place the water heater in  
Standby Mode and turn-off power to the water heater at the  
circuit breaker/fuse box.  
1. Locate the screw securing the filter panel to the heat  
pump shroud and loosening it.  
2. Remove (slide) the filter from the unit.  
3. If you are replacing the filter skip to step 4. To clean the  
filter use a vacuum with a hose attachment to remove  
any dust or debris.  
4. Place the new or cleaned filter into the water heater  
and secure the filter to the shroud with the screw  
loosened earlier.  
NOTE: Apply a light coat of hand dishwashing soap  
and water to the gasket. Tighten the element by turning  
it clockwise until secure.  
9. Close the drain valve and open the nearest hot water  
faucet. Then open the cold water shut off valve and  
allow the tank to fill completely with water. To purge  
the lines of any excess air and sediment, keep the hot  
water faucet open for 3 minutes after a constant flow of  
water is obtained.  
NOTE: The guides/slots when inserting the filter into  
the water heater.  
Figure 13:  
Screw-in  
5. Restore power to the water heater and press the  
power button to turn the water heater on. NOTE: the  
water heater will conduct a system diagnostic prior to  
operation.  
Spud  
Element  
Inspection/Cleaning of the Condensate  
Drain Pan & Condensate Drain Lines  
Gasket  
10. Check for leaks around the element(s).  
IMPORTANT: Before attempting to clean or replace the  
condensate drain pan or lines press the power button to  
place the water heater in Standby Mode and shut-off power  
to the water heater at the circuit breaker/fuse box.  
1. Remove the access panel (fan side) by loosening the  
screws securing it to the unit.  
2. Check the condensate drain pan and drain lines for any  
dirt or debris that might interfere with proper drainage.  
Wipe out any dirt or debris with a damp cloth.  
3. Once the condensate drain pan and lines have been  
inspected/cleaned, secure the access panel to the water  
heater.  
11. Reconnect the electrical wires to the element and  
securely tighten the screws (See Figure 12).  
12. Replace the protective plastic cover(s) removed earlier.  
Make sure the cover(s) are securely engaged on the  
attachment point(s).  
13. Replace the foam block(s) and access cover(s).  
14. Although this water heater is equipped with “Dry Fire”  
protection circuitry, be sure tank is completely filled with  
water before applying electrical power to the water heater.  
15. Reconnect electrical power to the water heater at the  
circuit breaker/fuse box.  
16. Press the power button to turn the water heater on. Set  
the desired water temperature and operating mode.  
NOTE: The water heater will conduct a system  
4. Restore power to the water heater and press the power  
button to turn the water heater on.  
diagnostic (approximately 8 minutes) prior to operation.  
NOTE: The water heater will conduct a system diagnostic  
prior to operation.  
15  
 
DIAGNOSTIC CODES  
DISPLAY SHOWS  
INDICATES  
CORRECTIVE ACTION  
UPPER ELEMENT  
CONNECT  
FAULT  
1. Upper element is not functioning  
1. Turn off power at the circuit breaker/fuse  
box and check for a loose connection at the  
element. For access directions see “Heating  
Element Replacement” section. If error persists  
proceed to the next step.  
2. Replace non-functioning element. See “Heating  
Element Replacement” section.  
LOWER ELEMENT  
CONNECT  
FAULT  
1. Lower element is not functioning  
1. Turn off power at the circuit breaker/fuse  
box and check for a loose connection at the  
element. For access directions see “Heating  
Element Replacement” section. If error persists  
proceed to the next step.  
2. Replace non-functioning element. See “Heating  
Element Replacement” section.  
IMPORTANT: Using an element greater  
than 2000 watts in place of the lower element  
will damage the water heater and void the  
warranty.  
HEAT PUMP  
CONNECT  
FAULT  
1. Heat Pump compressor is not  
functioning.  
1. Contact a qualified person to service the heat  
pump.  
FAN  
CONNECT  
FAULT  
1. Heat Pump fan is not functioning.  
1. Contact a qualified person to service the unit.  
1. Contact a qualified person to service the unit.  
1. Contact a qualified person to service the unit.  
1. Contact a qualified person to service the unit.  
AMBIENT TEMP  
SENSOR SHORT OR OPEN  
OR AD ERROR  
1. Ambient Temperature Sensor is not  
functioning.  
UPPER TEMP  
SENSOR SHORT OR OPEN  
OR AD ERROR  
1. Upper Temperature Sensor is not  
functioning.  
LOWER TEMP  
SENSOR SHORT OR OPEN  
OR AD ERROR  
1. Lower Temperature Sensor is not  
functioning.  
DISCHARGE TEMP  
SENSOR SHORT OR OPEN  
OR AD ERROR  
1. Discharge Temperature Sensor is not 1. Contact a qualified person to service the unit.  
functioning.  
COIL TEMP  
SENSOR FAULT  
OR AD ERROR  
1. Coil Temperature Sensor is not  
functioning.  
1. Contact a qualified person to service the unit.  
MAIN CIRCUIT BOARD  
FAULT  
1. Main Circuit Board is not functioning.  
1. Contact a qualified person to service the unit.  
1. See “Safety Shut-off” section.  
HIGH TEMP  
LOCKOUT  
1. Water temperature in unit has  
exceeded 190° F.  
CONDENSATE  
DRAIN  
ALARM  
1. Condensate pump failure.  
1. Check to see if accessory condensate pump is  
plugged in and has power. Also check circuit  
breaker/fuse box and GFCI (if used). if error  
persists proceed to the next step.  
2. Check condensate pump outlet tube for  
blockage. if error persists proceed to the next  
step.  
(If Accessory Condensate  
Pump is Installed)  
3. Check control wire connections to condensate  
pump. If error persists proceed to the next step.  
4. Replace accessory condensate pump. If error  
persists contact a Qualified Person.  
NOTE: The diagnostic codes listed above are the most common. If a diagnostic code not listed above is displayed,  
contact Residential Technical Assistance referencing the number on the front of this manual.  
16  
 
TROUBLESHOOTING CHART  
PROBLEM  
POSSIBLE CAUSE(S)  
CORRECTIVE ACTION  
NO HOT WATER  
1. Hot water usage pattern exceeds the  
capability of the water heater in  
current mode  
1. Change to different mode or modify usage  
patterns  
2. No power to the water heater  
2. Check for blown fuse or tripped breaker.  
Restore power to unit then press power button.  
3. Press the power button to turn the unit on  
4. Select mode other than Vacation  
5. Reset the high temperature limit switch; see  
“Safety shut-off” section for more information  
6. Contact a qualified person for service  
3. Unit in standby  
4. Unit in Vacation mode  
5. High temperature limit switch open  
6. Non-functioning upper temperature  
sensor  
INSUFFICIENT HOT WATER/  
SLOW HOT WATER  
RECOVERY  
1. Temperature set-point too low  
1. Increase set point temperature; see “Adjusting  
the User Interface Module” section  
2. Clean air filter  
3. Change to different mode or modify usage  
patterns (For example if in Efficiency Mode  
switch to Hybrid Mode)  
2. Air filter dirty  
3. Hot water usage pattern exceeds the  
capability of the water heater in  
current mode  
4. Water connections to unit reversed  
4. Ensure the cold connection is at the bottom  
and that the hot connection is at the top  
5. Heat lost through long run of exposed 5. Insulate exposed piping  
pipe  
6. Hot water leak at faucet or piping  
7. Non-functioning heating element  
8. Sediment or scale build up in tank  
6. Repair hot water leaks  
7. Call qualified person for service  
8. Drain and flush tank. Water conditioning may  
be necessary to minimize build up  
HIGH OPERATION COSTS  
1. Temperature set-point too high  
1. Decrease set point temperature; see “Adjusting  
the User Interface Module”  
2. Air filter dirty  
3. Electric mode selected  
2. Clean air filter  
3. Change to Efficiency or Hybrid mode for re-  
duced energy costs  
4. Ensure the cold connection is at the bottom  
and that the hot connection is at the top  
5. Insulate exposed piping  
4. Water connections to unit reversed  
5. Heat lost thru long run of exposed  
pipe  
6. Hot water leak at faucet or piping  
7. Sediment or scale build up in tank  
6. Repair hot water leaks  
7. Drain and flush tank. Water conditioning may  
be required to minimze build up  
DRIP FROM TEMPERATURE &  
PRESSURE RELIEF VALVE  
(Warning: Do not plug or cap  
T&P discharge pipe.)  
1. Excessive water pressure  
1. Check water supply inlet pressure. If higher  
than 80 PSIG, install a pressure reducing  
valve  
2. Add or service a thermal expansion  
tank.  
2. See “Closed System/Thermal Expansion” section  
3. Non-functioning Temperature &  
Pressure Relief Valve  
3. Replace the Temperature & PressureRelief  
Valve  
OTHER  
1. The water heater does not  
immediately start  
2. The heat pump does not run in  
Efficiency mode.  
3. The heat pump runs when set to  
Electric mode.  
1. When first started the water heater takes about 8  
minutes to complete a diagnostic routine  
2. Contact a qualified person for service  
3. Contact a qualified person for service  
17  
 
REPAIR PART ILLUSTRATION  
REPAIR PARTS LIST  
11  
ITEM  
10  
PARTS DESCRIPTION  
NO.  
1
2
Upper Access Cover  
Lower Access Cover  
Upper Element (4500 Watts)  
Lower Element (2000 Watts)  
Energy Cut-Off (ECO) Switch  
Temperature & Pressure Relief Valve (T&P)  
Dip Tube (at hot water outlet)  
Powered Anode Rod  
User Interface Module  
Air Filter  
3
12  
4
9
5
6
8
17  
7
8
9
13  
18  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20*  
21*  
22*  
23*  
Air Inlet Side Panel  
Air Outlet Side Panel  
Fan Assembly  
5
7
16  
6
1
19  
Drain Valve  
15  
Protective Plastic Cover  
ECO Cover  
3
Control Board  
Relay  
EPS Cover  
4
19  
2
15  
Ambient / Coil / Discharge Temperature Sensor  
Upper / Lower Tank Temperature Sensor  
Run Capacitor  
14  
Control Board Module Fuses  
* NOT SHOWN  
REPAIR PARTS  
Repair parts may be ordered through your plumber, local  
distributor, home improvement center, or by calling  
1-800-527-1953. When ordering repair parts always give  
the following information:  
1. Model, serial and product number  
2. Item number  
3. Parts description  
18  
 
NOTES  
19  
 
Copyright © 2010 A.O. Smith Corporation. All rights reserved.  
20  
 

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