Operation Manual

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Q The heat pump unit repeats Run and Stop
A During hot water storage operation, if the outdoor air temp is rather low, the HP unit repeats
Run and Stop due to defrost operation.
During standby, if the outdoor air temp is below 5°C the water pump built in the HP unit
repeats Run and Stop in order to prevent water in the HP unit and piping from freezing.
And during standby, the fan of the air to refrigerant heat exchanger on the HP unit repeats
Run and Stop depending on the SW setting in order to prevent snow from accumulating on
the fan. (SW setting is required)
Q During hot water storage operation, the surface of the air to refrigerant heat exchanger
becomes white with frost.
A If the outdoor air temp is rather low, the surface of the air to refrigerant heat exchanger may
be covered with frost during operation.
Q During hot water storage operation, water comes out from the HP unit.
A When the HP unit retrieve heat from the air, dew condensation comes out. And if the outdoor
air temp is rather low, much water comes out due to melting frost by defrost operation.
Q Hot water does not come out
A If no hot water or no water comes out, water in the pipe may be frozen. Please consult with
the dealer where you purchased.
If only water (not hot water) comes out, it is the states that hot water is not stored in the
cylinder.
Please start operation to top up or to fill up and store hot water in the cylinder.
Q Hot water amount is decreasing despite no usage of hot water.
A The display of hot water amount shows the hot water amount in the cylinder whose temp is
about 50°C or higher.
If hot water does not be used for a long period of time, hot water in the cylinder becomes
colder due to natural heat dissipation so that the display of hot water amount becomes
decreasing.
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When error happens
However, please note the following cases are not anomaly.
The cases that are not anomaly