American Water Heater 50 Gallon Residential Hybrid Electric Heat Pump Water Heater HPSE10250H045DV user manual

							1
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 
1-800-999-9515
When calling for assistance, please have the following 
information ready:
1. Model number
2.10 Digit product number
3. Serial number
4. Date of installation
5. Place of Purchase
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  ........................................................... 11-14
  Before Using  ........................................................................\
..... 11
  Water Temperature Regulation  ................................................. 11
  Adjusting the User Interface Module/Operational Modes .......... 12
 Operational Conditions  ........................................................ 13-14
Maintenance of Your Water Heater  .................................................. 15-16
 Routine Maintenance  ................................................................. 15
  Temperature and Pressure Relief Valve .................................... 15
  Draining and Flushing ........................................................... 15-16
  Heating Element Replacement .................................................. 16
Diagnostic Codes  ........................................................................\
.......... 17
Troubleshooting Chart  ........................................................................\
... 18
Repair Parts Illustration  ........................................................................\
. 19
Table of Contents                 Page
326885-003 July, 2014
LOW LEAD
CONTENT 
						

							2
Your safety and the safety of others are very important.
We have provided many important safety messages in this manual and on you\
r appliance. Always read and obey all 
safety messages.This is the safety alert symbol.
This symbol alerts you to potential hazards that can kill or hurt you an\
d others.
All safety messages will follow the safety alert symbol and either the w\
ord “DANGER” or
“WARNING.” These words mean: You can be killed or seriously injured if you don’t 
immediately follow instructions.
You can be killed or seriously injured if you don’t
follow instructions.
All safety messages will tell you what the potential hazard is, tell you\
 how to reduce the chance of injury, and tell you 
what can happen if the instructions are not followed.
Important Safety Instructions
CAUTION:  Hydrogen gas is produced in a hot water system served by this heater tha\
t has not been used for a long 
period of time (2 weeks or more).  Hydrogen gas is extremely  fl 
ammable. To reduce the risk of injury under these 
conditions, it is recommended that the hot water faucet be opened for se\
veral minutes at the kitchen sink before 
using any electrical appliance connected to the hot water system. When h\
ydrogen is present, there will probably be 
an unusual sound such as air escaping through the pipe as the water begi\
ns to  fl ow. There should be no smoking or 
open  fl ame near the faucet at the time it is open.
The California Safe Drinking Water and Toxic Enforcement Act requires the Governor of California to publish a list of 
substances known to the State of California to cause cancer, birth defects, or other reproductive harm, and requires 
businesses to warn of potential exposure to such substances.
WARNING: This product contains a chemical known to the State of California to cau\
se cancer, birth defects, or other 
reproductive harm. 
This appliance can cause low-level exposure to some of the substances in\
cluded in the Act.
WATER HEATER SAFETY 
						

							3
INSTALLING YOUR WATER HEATER
Consumer Information
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:
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
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. 
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. 
If you lack the necessary skills required to properly install this 
water heater or you have diffi culty following the directions, you 
should not proceed but have a quali fi ed person perform the 
installation of this water heater.
Examples of a qualified person include: licensed plumbers, 
a
 uthorized electric company personnel, and authorized 
service personnel.
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.  
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.
Basic Operation Fundamentals
The Heat Pump Water Heater (HPWH) is an integrated 
heat pump water heater unit, having a compressor and 
external coil heat exchanger with backup electric elements 
(Figure 1). When in Effi  ciency 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. 
The backup element will turn on as a booster if the tank 
temperature is too low from the set point during high 
demand period, or if environmental conditions dont provide 
enough heat to meet demand. 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 the water while the electric elements only function 
during 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 effi
 cient the unit will be.
The HPWH uses about half the electricity of a comparably 
sized conventional electric water heater when operating 
in the Effi  ciency/Hybrid Modes, and may provide up 
to ½ ton cooling capacity and dehumidi fi cation.  It is 
designed for indoor, residential applications for installation 
in a basement, garage or utility room (See “Location 
Requirements” section).
Unpacking the Water Heater
WARNING
Excessive Weight Hazard
Use two or more people to move and install 
water heater.
Failure to do so can result in back or 
other injury.
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.
Figure 1
Heat Pump Water Heater Basic Operation 
						

							4
Figure 3
Residential Garage
Installation
Vehicle
Stop
Drain Drain 
Pan 
NOTE: The water heater shall be located so it is not subject 
to physical damage by moving vehicles or area fl ooding.
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 
http://www.dsa.dgs.ca.gov, or call 1-916-445-8100 and 
request instructions.
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 failure to follow 
these instructions.
 
METAL
DRAIN
PAN
AT LEAST 2” GREATER  THAN THE 
DIAMETER OF THE WATER HEATER. PIPED TO AN 
ADEQUATE DRAIN
•  The water heater may be placed on its designated side 
(see carton) for local transportation only.
•  The water heater must be 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.
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 fl  ooring beneath the water heater 
must be able to support the weight of the water heater when 
fi  lled with water (Table 1).  
IMPORTANT: The water heater must have unrestricted 
airfl  

ow and requires a minimum installation space of 700 
cubic feet. As an example, a room that has an eight foot tall 
ceiling and is 10 feet long by 8-3/4 feet wide would contain 
700 cubic feet.  
NOTE: To ensure optimal performance and servicability, a 
minimum clearance of six (6) inches must be maintained 
from all sides and six (6) inches from the top for access to 
the air fi  lter.
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.
The site location must be free from any corrosive elements in 
the atmosphere such as sulfur, fl  uorine, sodium 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 the Air Filter 
Maintenance section in this manual.  
The ambient air temperature must also be considered 
when installing this unit. In Ef fi ciency Mode the ambient 
air temperature needs to be above 45°F/7.2 °C and below 
120°F/48.8 °C for heat pump operation. 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 in either 
Effi  ciency Mode or Hybrid Mode.
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 
fl  oor at least 18 inches.  Ensure that a platform capable of 
supporting the combined weight of the water heater and 
water is used.
Table 1
Capacity Filled Weight (lbs)
50 Gallon 573
66 Gallon 796
80 Gallon 921 Figure 2
Metal Drain Pan
Installation 
						

							5
Water System Piping
Piping, fi 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.
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. 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. 
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 4 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. 
xxxxx
xxxxx
xxxxxxxxxxVacuum Relief Valve
(when required by local code)
Cold Water 
Inlet Valve
Massachusetts: Install a vacuum relief in 
cold water line per section 19 MGL 142.
Cold Water 
Inlet
Pressure Reducing Valve (PRV)
should be installed where the water
supply enters the residence.
When installed PRVs create a 
closed water system, a thermal
expansion tank must be installed.
* If an adequate drain is not available for the condensate drain lines t\
hen a condensate pump must be used. DO NOT discharge the condensate drain       
lines into the metal drain pan. In a closed system, use a
thermal expansion tank.
See “Closed System/
Thermal Expansion”
section.
6” Maximum 
Air Gap Shut-off Valve
(Cold) *Primary Condensate Drain (3/4” PVC)
Tempered Water to Fixtures
Optional Mixing Valve - Follow the Mixing 
Valve’s Manufacturer’s Installation
Instructions. (Set to 120°F / 48.8°C) Untempered Water Outlet
Shut-off Valve (Hot)
Union
Drain Line 3/4” 
ID Minimum
Metal Drain Pan 2 1/2” 
Depth Maximum and
2 Inches wider than
the water heater. Discharge Pipe
(Do Not Cap or Plug) Temperature and 
Pressure Relief Valve
Union
Drain
Cold
(Inlet) Hot
(Outlet) Optional Heat Trap Piping
1/2” Flexible
Secondary
Condensate
Tubing
Figure 4
Union 
						

							6 Please note the following: 
•  The system should be installed only with piping that is suitable for potable (drinkable) water such as copper, 
CPVC, PEX or polybutylene. This water heater must 
not be installed using iron piping or PVC water piping.
•  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.  
•  Use only 95/5 tin-antimony or other equivalent solder.  Any lead based solder must not be used.
•  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.
Connecting the Condensate Pump 
Optional Over fl ow Shut Off Switch 
1.  Determine if you have a floor drain, if not a condensate 
pump will be required.
2.  Turn off power to the electrical wiring for the water  heater at the circuit breaker/fuse box.
3.  Locate the white 18 AWG wire loop close to the drain  connections (Figure 5).
4. 

Cut the loop and strip insulation off of the two ends. 5.  Measure the distance from the condensate drain pan 
cover 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 (Figure 7). 
6.  Remove the condensate drain pan cover by removing  the four screws, pull these two wires through the 
grommet on the drain pan cover. Connect these two 
wires to the two wires on the water heater using wire 
nuts or other connectors. Reinstall the drain pan cover 
and keep the connection joint inside of the cover.
7.  Connect the free ends of the two wires to the shut off  switch on the condensate pump in accordance with the 
condensate pump manufacturers recommendations 
(Figure 7). 
8.  Turn on electrical power to the water heater.
9. Select the efficiency mode. After about 8 minutes  (the user interface module will display “-”, “--”, “---”\
 
repetitively during this period), the heat pump will turn 
on if the ambient temperature and water temperature 
meet the heat pump requirement.
10. 

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.
11.  The heat pump should turn off and the error code “EoF”  will appear on the display screen.
12.  Plug the condensate pump in and verify that the pump  operates and pumps the water out of the condensate 
reservoir.
13.  The error code on the display should clear and the heat  pump should operate after 8 minutes.
Condensate Drain Line Installation
The condensate drain lines consist of one 3/4 PVC line as 
the primary condensate drain line and one 1/2 clear rubber 
tubing for the condensate over flow. These condensate 
lines are located on the upper right rear section of your 
water heater. 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. 
When installing the drain line, note the following:
Figure 5
Condensate Pump Wiring 
Overflow Slot  Main Drain Connection 
Condensate Drain 
Access Cover 
Condensate Pump Wiring 
Loop 18 AWG-White
(Loop Located Close to the Drain Connections)
Red Black
Approved Connectors
Figure  6
Wiring Diagram
Overload
Protection
To 240v1 Phase
Power supply
Electrical
Service ground
L1 L2
Circuit
Breaker
Ground
Wire
Green
Figure 7
Condensate Pump Wiring 
Condensate Pump Wiring Loop 22 AWG - White
(Loop Located Close to the Drain Connections)
White Wires
From Water Heater  Wires to Condensate 
Pump Overflow Shut Off Switch
(22 AWG or Larger) 
						

							7
IMPORTANT: When making condensation connections 
to the primary connection DO NOT over tighten. 
Overtightening could crack or damage the condensate 
drain pan.
•  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 fittings, primer and glue to cement the  condensate drain lines to the heat pump drain pan.
•  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 section 
on Condensate Pump Overflow Shut Off Switch in the 
Electrical Requirements section.)
Closed System/Thermal Expansion
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.
Do not plug valve.
Do not remove valve.
Failure to follow these instructions can 
result in death or explosion.
WARNING
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.
Figure 8
Temperature and Pressure
Relief Valve Installation
Temperature and 
Pressure Relief Valve
Discharge Pipe
(Do Not Plug or Cap)
Drain Pan 2 1/2”
Depth Maximum and 
2” wider than the 
water heater
Drain Line 3/4”
ID Minimum Drain 6” Maximum 
Air Gap
Temperature and Pressure 
Relief Valve 
						

							8 For protection against excessive pressures and 
temperatures, a temperature and pressure relief valve must 
be installed in the opening marked “T
 & P RELIEF VALVE” 
(Figure 8).
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 
certifi  ed 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  fl oor, and does not contact any live 
electrical part. The discharge opening must not be blocked 
or reduced in size under any circumstance. 
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:   
•  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.
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.
•  Shall be of material listed for hot water distribution.
•  Shall be installed to allow complete drainage of both  the valve and discharge line.
Temperature/Pressure Relief Valve 
Insulation
1.  Locate the temperature and pressure relief valve on the water heater, also known as a T&P relief valve (Figure 
8).
2.  Locate the slit running the length of the T&P relief valve  insulation.
Figure 9   
T&P Relief Valve Insulation 
T&P Relief Valve
T&P Relief Valve 
Drain Line Manual Relief Lever
T&P Relief Valve Insulation
WARNING
Electric Shock Hazard
Disconnect power before 
servicing.
Replace all parts and panels 
before operating.
Failure to do so can result in 
death or electrical shock.
 
   
 
WARNING
Fire Hazard
Use 10 gauge solid copper 
wire.
Use a UL listed or 
CSA approved strain relief. 
Connect ground screw to 
green             ground wire.
Failure to do so can result in 
death, fire, or electrical shock.
3.  Spread the slit open and  fi t the insulation over the T&P 
relief valve (Figure 9). Apply gentle pressure to the insu-
lation to ensure that it is fully seated on the T&P Relief 
Valve. Once seated, secure the insulation with duct tape, 
electrical tape, or equivalent. 
IMPORTANT: The insulation and tape must not block 
the discharge opening or hinder access to the manual
  
relief lever (Figure 9). Ensure a discharge pipe is in-
stalled into the T&P valve discharge opening per the 
instructions in this manual.
Electrical Requirements 
						

							9
If you lack the necessary skills required to properly install the 
electrical wiring to this water heater

, do not proceed but have a 
quali fi ed electrician perform the installation.
When making the electrical connections, always make sure:
•  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).
•  The water heater and electrical supply are properly   grounded.
•  The electrical supply has the proper overload fuse or  breaker protection.
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, 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”.
2.  Turn off power to the electrical wiring for the water heater at  the circuit breaker/fuse box.
3.  If metal conduit is used for the grounding conductor: 
A.  The grounding electrode conductor shall be of copper, aluminum, or copperclad aluminum. The material shall 
be of one continuous length without a splice or joint.
B.  Rigid metal conduit, intermediate metal conduit,  or electrical, metallic tubing may be used for the
  
grounding means if conduit or tubing is terminated in 
fittings approved for grounding.
C.  Flexible metal conduit or flexible metallic tubing shall  be permitted for grounding if all the following conditions 
are met:
•   The length in any ground return path does not 
exceed 6 feet.
•    The circuit conductors contained therein are 
protected by overcurrent devices rated at 30 amperes.
Figure 10
Junction Box
Power Supply
Connector
Black Wire 
Red Wire Green
Ground
Wire
1/2” Conduit
Opening
Green Ground Screw
•    The conduit or tubing is terminated in fittings 
approved for grounding.
For complete grounding details and all allowable exceptions, 
refer to the current edition of the National Electrical Code NFPA 
70.
4.  A standard 1/2 conduit opening has been made in the  water heater junction box for the conduit connections.
5.  Use wire nuts and connect the power supply wiring to the  wires inside the water heaters junction box (Figure 10).
6.  The water heater must be electrically grounded by the  installer. A green ground screw has been provided on the 
water heaters junction box. Connect ground wire to this 
location.
7.  Replace the wiring junction box cover using the screw  provided. 
8.  Turn on electrical power to the water heater.
9.  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.
10.  Once the diagnostic sequence has finished, the fan should  turn on.  
NOTE: The heat pump’s fan will not turn on if the 
incoming water temperature is less than 59°F / 15 °C and/
or the ambient air temperature is above 120°F / 15 °C 
or below   45°F / 7.2°C. Should the internal diagnostics 
detect a problem with the heat pump, an error code will be
  
displayed. 
11.  Set the desired operational mode. For typical installations,  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.
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. If an insulation 
blanket is installed, make sure it does not block airflow into 
or out of the compressor assembly. 
						

							10
Water Heater Location
 
□ Centrally located with the water piping system.
 
□ The fl  
ooring beneath the water heater must be able to 
support the weight of the water heater when  fi lled with 
water (Table 1).
 
□ Located indoors (such as a basement or garage) 
and in a vertical position. Sheltered from freezing 
temperatures.
 
□ Provisions made to shelter the area from water  

 
damage. Metal drain pan installed and piped to an 
adequate drain.
 
□ Sufficient room to service the water heater.
 
□ The water heater must have unrestricted airflow and 
requires a minimum installation space of 700 cubic feet. 
As an example, a room that has an eight foot tall ceiling 
and is 10 feet long by 8-3/4 feet wide would contain 
700 cubic feet.    
NOTE: 
This Heat Pump Water Heater may be located 
within a required minimum  of 6” clearance from a 
wall on the outlet side, however for future service 
considerations a minimum clearance of 3 feet from 
any obstruction on the back, left and right side is 
recommended.
 
□ The unit cannot be placed into any type of closet or 
small enclosure, unless adequate provision is made for 
air exchange (vented or louvered doors, etc.).
 
□ The site location must be free from any corrosive 
elements in the atmosphere such as sodium, sulfur

, 
fl  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 “Preventive Maintenance” 
section).
 
□ Ambient air temperature should be above 45°F / 
7.2°C and below 120°F / 48.8°C. If the ambient air 
temperature falls outside these upper and lower limits 
the electrical elements will activate to meet the hot 
water demand.
Water System Piping
 
□ Temperature and pressure relief valve properly    
installed with a discharge pipe run to an adequate drain  
and sheltered from freezing (Figure 8).
 
□ All piping properly installed and free of leaks.
 
□ 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).
Condensate Drain Line Installation
INSTALLATION CHECKLIST
 
□ Must be located with access to an adequate drain or 
condensate pump.
 
□ Condensate drain lines installed and piped to an 
adequate drain or condensate pump (Figure 4).
Electrical Connections
 
□ This water heater requires a 240 VAC single phase 30 
amp power supply. DO NOT use a 208 VAC service.
 
□ 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.
 
□ Water heater and electrical supply are properly    
grounded.
 
□ 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). 
 
□ 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). 
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. 
IMPORT

ANT: If water is coming from the overflow-
slot of the condensate drain pan cover (Figure 11) this 
indicates that both condensation drain lines may be 
blocked. Immediate action is required.
 
□ To maintain optimal operation, check, remove and 
clean the air filter as needed(See “Air Filter Cleaning/
Replacement” section).
 
□ The Installation Instructions and Use & Care Guide 
should be kept with the water heater for reference. 
Figure 11
Overflow-SlotDrain Pan Cover
Primary Drain Secondary Drain