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49-50300-2 17
Installation Instructions
INSTALLATION INSTRUCTIONS
INSTALLATION CHECKLIST
1. Tank location:
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cu.m.) or 240 square inches (0.15 m
2
) open air-flow area needed.
– Back of unit away from wall by 7 inches (17.5 cm), and sides have at least 7 inches (17.5 cm)
clearance. (6 inches (15.2 cm) clearance for earthquake strap installations, with additional clearance on
the opposite side of the unit.)
– Front of unit is free and clear.
– Is the water heater level? If no, add shims under the base of the unit to ensure proper function of
sensors.
2. Verify Air Filter is installed. (Located in packaging).
3. Plumbing connections:
– (700 cu.ft. / 19.8 cu.m.) or 240 square
– Does not prevent air filter removal.
– No leaks after filling the tank with water, either when water is flowing or not.
4. Condensate lines are in place:
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not recommended.
5. Temperature and pressure-relief valve is working and drain line completed per local code.
6. Electrical verify 208/240 VAC to L1 and L2 at tank.
7. Electrical connection does not prevent air filter removal.
8. Verify control panel displays 120°F (49°C) Hybrid mode. Assist user in how to adjust temperature and
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WHAT TO EXPECT FOR “NORMAL STARTUP” IN HYBRID MODE
After the unit has been installed, with all electrical and water connections secure and checked, then the unit
should be filled with water (vent tank by opening a hot water faucet somewhere in home to allow tank to fully fill
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Elapsed Time HEWH Actions Comments
0 to 2 minutes Unit will go through self-check.
Fan will turn on after 1 minute.
This 2-minute off-time prevents compressor
damage. A clicking noise may be heard during
startup.
2 to 22 minutes Compressor turns on. Fan contin-
ues to run.
This 20-minute period is used to ensure the
tank is full of water (Dry-fire prevention algo-
rithm).
22 minutes and
beyond
Compressor turns off (Fan will
run for 20 minutes after any
compressor operation). Normal
heating operation resumes.
The water heater is operating in Hybrid mode.
Quickly provides initial amount of hot water
with heating elements, then switches to effi-
cient heat pump for majority of heating.
NOTE: The heat pump operating range is 35°F to 120°F (2°C to 49°C). If the ambient temperature is outside of
this range, the heat pump will turn off and the electric elements will be used until the ambient temperature returns
to within the operating range.
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