13
Operational Conditions
Water Odor
In each water heater there is installed at least one anode
rod (see parts sections) for corrosion protection of the tank.
Certain water conditions will cause a reaction with this rod
and the water. The most common complaint associated
with the anode rod is one of a "rotton egg smell" in the
hot water. This odor is derived from hydrogen sulfide gas
disolved in the water. The smell is the result of four factors
which must all be present for the odor to develop:
A. A concentration of sulfate in the supply water.
B. Little or no dissolved oxygen in the water.
C. A sulfate reducing bacteria which has accumulated
within the water heater (this harmless bacteria is nontoxic
to humans).
D. An excess of active hydrogen in the tank. This is caused
by the corrosion protective action of the anode.
Smelly water may be eliminated or reduced in some
water heater models by replacing the anode(s) with one
of less active material, and then chlorinating the water
heater tank and all hot water lines. Contact the local water
heater supplier or service agency for further information
concerning an Anode Replacement Kit and the chlorination
treatment. If the smelly water persists after the anode
replacement and chlorination treatment, we recommend
that chlorination or aeriation of the water supply be
considered to eliminate the water problem.
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:
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.
3. The heat pump compressor or fan running.
Stacking
Stacking occurs when a series of short hot water draws (3
gallons or less) are made. 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.
Figure 12
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 light will be turned off except for
the “Opertional Mode Indication Light”, which will be on
all the time when the unit is powered on. The unit will be
awakened by pressing any button.
Other Controls
°F/°C
°F/°C Switch - Press “Temperature Down” button
and hold for 3 seconds to switch temperature unit
between Farenheit and Celsius
Power Saver Enable/Disable - Press “Mode/Enter” button
and hold for 3 seconds. The power saver feature will be
activated and the display will show “P.S.”, and the setting
temperature alternatively. This feature allows the unit to be
managed by grid or other utility based load management
programs.
To deactivate the power saver, press “Mode/Enter” button
and hold for 3 seconds.
Heat pump defrosting indication - There will be frost accu-
mulating on the evaporator when the heat pump is oper-
ated under low ambient temperatures. The controller will
order the unit to enter into defrosting cycle to optimize the
heat pump operation performance. 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 display “HPO” as an indication that the ambient
and/or water temperature condition is out of the heat pump
operation range.
