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INSTALLATION
Electric Mode -
The water heater functions as a
conventional electric unit, relying on
only the elements for heat. This mode
may be useful in periods of increased
hot water demands. Electric Mode will
remain for 48 hours before reverting
back to default mode setting.
Vacation Mode -
The controller will maintain a 60°F
tank temperature while in Vacation
setting. This mode is recommended
when the water heater is not in use
for a long period of time, to minimize
energy consumption and prevent the
water heater from freezing during cold
conditions.
To enter Vacation Mode -
Press and hold the up ↑ button. If
selected, the unit will default to 7
days, but you will be able to adjust the
number of days by pressing the up ↑
and down ↓ arrows; press the Mode/
Enter button to confirm the number of
days. When set time for Vacation Mode
has completed, UIM will automatically
return to last mode selected.
CAUTION! Hydrogen gas builds up in
a hot water system when it is not used
for a long period (two weeks or more).
Hydrogen gas is extremely flammable.
If the hot water system has not been
used for two weeks or more, open a
hot water faucet for several minutes at
the kitchen sink before using any elec-
trical appliances connected to the hot
water system. Do not smoke or have
an open flame or other ignition source
near the faucet while it is open.
18 • Residential Hybrid Electric Heat Pump Water Heater Use and Care Guide
NOTE: When Vacation Mode is
selected, the vacation timer will be dis-
played. Press the Up and Down button
to modify the timer to desired number
of vacation days (setting range: 1 to
99 days). The vacation timer will blink
on the display; press the Mode/Enter
button to confirm the vacation timer.
To deactivate Vacation Mode, press the
Mode/Enter button to switch to the
desired mode.
NOTE: Do not shut off power to the
unit for extended periods of time.
If power must be turned off for an
extended period of time, drain the tank
completely.
Other Controls
°F/°C Switch - Press "Temperature
Down" button and hold for 3 seconds
to switch temperature unit between
Farenheit and Celsius
Remote Access Enable/Disable:
•
Press "Mode/Enter" button and
hold for 3 seconds. The power
saver feature will be activated and
the display will show "rA", and the
setting temperature alternatively.
This feature allows the unit to be
monitored and controlled using
the Connectivity Port and a seper-
ate control module.
•
To deactivate Remote Access,
press "Mode/Enter" button and
hold for 3 seconds.
Heat pump defrosting indication:
•
There will be frost accumulat-
ing on the evaporator when the
heat pump is operated under low
ambient temperatures. The con-
troller will order the unit to enter
into defrosting cycle to optimize
the heat pump operation per-
formance. During the defrosting
period, the user interface module
will display "ICE" as an indication.
Out of heat pump operation range:
•
The user interface module will dis-
play "HPO" as an indication that
the ambient and/or water temper-
ature condition is out of the heat
pump operation range.
NOTE: The display will go into "Sleep
Mode" for energy saving if there is no
operation on any button for 15 min-
utes. All the display and lights will be
turned off except for the "Operational
Mode Indication Light", which will
remain illuminated while the unit is
powered on. The unit can be awak-
ened by pressing any button.
Your Heat Pump Water Heater is Smart
Grid capable. Contact your local electric
utilities company for participation and
plug in module availability and to learn
more about potential energy savings
opportunities.
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Troubleshooting
