Hitachi RAC-DX10HNK, Manual, Page: 14 / 52

●
The dust and dirt adhering to indoor heat exchanger is the cause of the smell. They are washed away by
freezing and thawing of the heat exchanger.
●
●
Indoor Frost Wash function can work when the outdoor temperature is 1
℃ to
43
℃
and indoor humidity is 30%
to 70%. There are two kinds of Indoor Frost Wash operation, auto mode and manual mode.
INDOOR FROST WASH OPERATION
※
It depends on the conditions of the room.
The process of Indoor Frost Wash
About 8 min
About 20 min to 90 min.
Operation such as
cooling operation
Freezing and thawing heat exchanger
Auto Stop
Running Stop
The deflectors remain opened during
fan operation, freezing, thawing.
●
If you want to stop Indoor Frost Wash operation, press the ( ON/OFF ) button twice.
●
lamp on the indoor unit lights up during Indoor Frost Wash operation.
Indoor Frost Wash starts
Indoor Frost Wash ends
●
When pressing the button such as cooling during Indoor Frost Wash operation, Indoor Frost Wash operation
is discontinued and start the cooling operation after about 3 minutes.
●
When Indoor Frost Wash is stopped during Indoor Frost Wash operation, the unit automatically restart Indoor
Frost Wash operation when the next operation stops.
●
In order to protect the unit , Indoor Frost Wash function cannot be carried out again for about 60 minutes after
Indoor Frost Wash operation is completed.
" "
Fan operation
■
Indoor Frost Wash (Auto mode)
Indoor Frost Wash auto start conditions
●
When the outdoor temperature or indoor humidity are not suitable for Indoor Frost Wash operation, only fan
operation is carried out, Indoor Frost Wash operation will be done again after the next operation stops.
●
Sometimes the heat exchanger may not freeze depending on the conditions of the room.
●
When the ON timer reaches the set time during Indoor Frost Wash operation, it will stop the Indoor Frost Wash
operation and start the operation of setting mode.
●
If the interval of the Off to On timer is less than 2 hours, Indoor Frost Wash operation may not be completed. In
that case, it will restart Indoor Frost Wash operation after the next operation stops.
Once the auto mode of Indoor Frost Wash operation interval (42 hours) is reached, stop operating the air
conditioner and activate Indoor Frost Wash in Auto or Manual mode.
Accumulated operating hours of the air conditioner have exceeded 42 hours
Air conditioner is stopped operating for more than 30 minutes, such as cooling
operation
Indoor Frost Wash start
Indoor Frost Wash end
About 20 min to 90 min. About 30 minutes or more
Operation such as
cooling operation
Operation such as
cooling operation
Last Indoor Frost Wash
Running Stop Running Stop
Auto Stop Indoor Frost Wash
Accumulated operating hours of the air conditioner
have exceeded 42 hours
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