Frostwash - Hitachi PC-ARFG2-A Operation Manual

5. Function Menu Screen Display

5.12 FrostWash

This function suppresses a clog on the heat exchanger.
First, freeze the indoor unit heat exchanger when whole system is under stoppage. Then defrost it to remove
the dust with drain water. Auto-FrostWash and Manual FrostWash are selectable.
NOTES:
•
This function cannot be set when the indoor unit and the outdoor unit do not support this function.
•
When the air conditioner system supports FrostWash function and the function selection F1 of outdoor unit
is set as valid , then the FrostWash is automatically valid.
•
Depending on the outdoor unit, the settings on the outdoor unit may be required.
•
Cracking noise may be heard during freezing or defrosting phase due to temperature change. Refrigerant
flow noise may also be heard. The noise may be heard relatively louder in a quiet environment. It is
recommended to set "Auto-FrostWash Schedule" when room is not occupied.
•
Ice fog may come out from air outlet during FrostWash operation. Ice fog could happen in a humid
environment such as the room humidifier is used in a small room.
•
This function is not available to operate where the outside temperature is lower than 34
o
than 110 F(43°C).
•
This function is not available to operate where the room temperature is lower than 59
o
86 F(30°C).
•
The level of dust removed depends on usage environment.
•
Limitations and settings are required when using this feature in a VRF system. For more information, please
refer to the outdoor unit service manual for FrostWash function.
5.12.1 Function
(1) [Function 1] Auto-FrostWash
It is a function that automatically starts FrostWash when the operation is stopped after the total time that
the indoor unit has been operated.
Auto-FrostWash Flow
*1: Advanced wired controller can set 50-400 hours.
Cooling or
last FrostWash
other mode
Operate
•
Auto-FrostWash is disabled in default setting. To enable this function, set the Auto-FrostWash to be
4
enabled.*
4
* : When the air conditioner system supports FrostWash function and the function selection F1 of
outdoor unit is set as valid, the default setting of the wired controller is valid.
•
If the Auto-FrostWash is stopped, the total operating time will be reset.
(2) [Function 2] Manual FrostWash
This function is to perform FrostWash at your favorite timing, allows you to perform FrostWash as your
preferred time, such as when you have not used Cooling or another mode for a while.
5.12.2 Advanced Wired Remote Controller Setting Item
•
Start FrostWash ( Page 35 )
This item is selected when performing [Function 2] Manual FrostWash.
Manual FrostWash can be performed even if Auto-FrostWash is enabled.
•
Enable/Disable Auto-FrostWash (Page 36 )
[Function 1] This is a setting to enable or disable Auto-FrostWash.
○ "Enable": FrostWash is performed automatically.
○ "Disable": The function does not work (the default setting).
34
The total operating time is 100 hours*
(Default setting)
. . .
Cooling or
other mode
Stop Operate
Start FrostWash
Approx. 3 min.* Approx. 10 min. to 35 min.*
*2: Change according *3: Change according to
to the outdoor unit. indoor temperature
and outdoor temperature.
ForstWash
FrostWash
preparation
Stop
o
F(1°C) or higher
o
F(15°C) or higher than
FrostWash Completed
Stop Automatically
A16381TMEU