12
Adjusting the User Interface Module/Operational Modes
Water Temperature Adjustment
The water temperature can be adjusted from 95°F / 35°C to
140°F / 60°C. Use the Up and Down Buttons
on the front panel to set the desired temperature. The
setting temperature will blink on the display, press Mode/
Enter button to con
fi
rm.
The water temperature can be adjusted quickly by pressing
the “Temperature Up” button and holding for three seconds.
IMPORTANT:
Before attempting to adjust the thermostat,
read the “Water Temperature Regulation” section. If the
instructions are not clear, contact a quali
fi
ed person.
IMPORTANT:
For increased water demand, 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
fi
nished.
Operating Mode Descriptions
The operating modes can be changed sequentially by
pressing the Mode/Enter button (Figure 12). The Operation
Mode Indication Light will turn on when the relevant mode
is selected.
This unit is equipped with technology that senses the
amount of water drawn from the unit. While in Ef
fi
ciency or
Hybrid mode, during normal usage, the unit will operate the
heat pump for maximum ef
fi
ciency. In times that the water
usage is above normal, this unit has the ability to use one
element (upper or lower) and the heat pump simultaneously
to help improve recovery. This transition is seamless and
will go unnoticed.
◊
Efficiency Mode - Provides the highest efficiency and
lowest cost operation by using only the heat pump for
heating. Recovery time and efficiency will vary with
ambient temperature and relative humidity. Efficiency
will be greatest, and recovery quickest, when both
are high. At lower temperatures and relative humidity
levels, efficiency will be lower and recovery will take
longer. Heat pump operation is allowed from 45°F /
7.2°C ambient temperature. At ambient temperatures
lower than 45°F / 7.2°C and greater than 120°F /
48.8°C, the heat pump will not operate. Similarly, if
the water temperature in the tank is less than 59°F
/ 15°C, the heat pump will not operate. The unit will
operate in electric mode until ambient and water
temperatures return to the safe operating range of the
heat pump.
◊
Hybrid Mode - This is the default, recommended
setting, combining high energy efficiency with
reduced recovery time. 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.
◊
Electric Mode - The water heater functions as
a conventional electric unit, relying on only the
elements for heat. This mode may be useful in winter
to eliminate the output of cold air from the unit.
◊
Vacation Mode - The controller adjusts the water
temperature to approximately 60°F. 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.
NOTE:
When Vacation Mode is selected, the
vacation timer will be displayed. 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.
IMPORTANT:
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.
CAUTION
:
Hydrogen gas is produced in a hot water
system served by a heater that 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 several minutes at the kitchen
sink before using any electrical appliance connected to
the hot water system. When hydrogen is present, there
will probably be an unusual sound such as air escaping
through the pipe as the water begins to
fl
ow. There
should be no smoking or open
fl
ame near the faucet at
the time it is open.