Instruction Manual

5.13.3 FrostWash setting on outdoor unit
To use this function in the VRF system, function selection F1
needs to be congured on the outdoor units. FrostWash setting
is disabled on the factory default setting. Set Function Selection
F1 according to the following table.
"F1" Setting
Condition
Auto-FrostWash
Manual
FrostWash
"Interval" Time
Duration
Start-up
Timing
Operation
0 Factory Setting (Default): Not available FrostWash
1
Total Comp.
Operation Hour:
500h
2 hours
after system
stopped
Operate outdoor
unit PSW
2
Total Comp.
Operation Hour:
1000h
3
Total Comp.
Operation Hour:
500h
Within the
time zone
scheduled by
Main Wired
Controller*
1,2
4
Total Comp.
Operation Hour:
1000h
5
Total Indoor Unit
Fan Operation
Hour: Depending
on Main Wired
Controller Setting
Within the
time zone
scheduled by
Main Wired
Controller*
1,2
Operate from
Main Wired
Controller*
1
or
operate outdoor
unit PSW
*1:
Only one “Main Wired Controller” exists in the same
refrigerant cycle, and all the others are “Sub Wired Controller”.
Refer to “6.1.12 Main Remote Setting” in this manual for the
details of Main Wired Remote Controller setting.
*2: You can set the schedule for the FrostWash operation from
the Main Remote Controller. Otherwise, the FrostWash
operation will start soon after the system is stopped.
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.
? NOTE
• This function cannot be set when the indoor unit and the outdoor unit
do not support this function.
• 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 ow 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 humidier
is used in a small room.
• This function is not available to operate where the outside temperature
is lower than 1°C or higher than 43°C.
• This function is not available to operate where the room temperature
is lower than 15°C or higher than 30°C.
• The level of dust removed is depend on usage environment.
• Limitations and settings are required when using this feature in a VRF
system.
5.13.4 Auto-FrostWash Flow
Cooling or other
mode
The total operating time is 100 hours
*1
(Default setting)
*1: Wired remote controller can set 50-400 hours.
Start FrostWash
Approx. 3 min
*2
Approx. 10 min to 35 min.
*3
*2: Change
according to the
outdoor unit.
*3: Change according to
indoor temperature and
outdoor temperature
FrostWash Completed
Cooling or other
mode
FrostWash
preparation
Stop
Automatically
Operate
OperateStop
Stop
Last FrostWash
FrostWash
• Auto-FrostWash is disabled in default setting. To enable this
function, set the Auto-FrostWash be enabled.
• If the Auto-FrostWash is stopped, the total operating time will
be reset.
? NOTE
In the case of 2 remote controllers, FrostWash can be set only on the
primary wired remote controller.
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FUNCTION MENU
PMML0565 rev.1 - 04/202229