Instruction Manual

5.13 FROSTWASH
FrostWash is available when applicable outdoor units and
indoor units are connected. To use this function in VRF system,
outdoor unit function selection item “F1” need to be congured
on outdoor units.
Please congure function selection F1 on the outdoor units, and
then set the wired remote controller.
Please contact the distributor or service personnel for availability
and conguration of this function.
5.13.1 About FrostWash
• Regarding the noise upon freezing and defrosting
- Cracking noise may be heard during the 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 the “Auto-FrostWash Schedule”
when the room is not occupied.
- Choose not to use the FrostWash function in places such
as hotel rooms and hospitals, where consistent quietness
is expected.
• Ice fog may come out from air outlet during the FrostWash
operation.
• Ice fog could happen in a humid environment such as the
room humidier is used in a small room.
• FrostWash is available when the outside temperature is in
the range of (1°C - 43°C), and the indoor temperature is in
the range of (15°C - 30°C).
• Also refer to technical documents of outdoor units because
outdoor temperature range may vary depending on outdoor
units’ type.
• The temperature around the indoor unit may drop slightly
during FrostWash operation.
5.13.2 Start FrostWash
Generate frost on the coil and then melt the frost to wash the
coil.
FrostWash setting is not enabled as factory setting. This function
has to be activated from the outdoor unit rst (refer to
“5.13.5 FrostWash Setting” for more information) and then
controlled from the wired controller.
Preparation
(Fan mode)
Start FrostWash
Freezing, defrosting, drying
heat exchanger
FrostWash Completed
Stop Automatically
Approx. 3 min.*
*1: change according
to the outdoor unit
*2: change according to indoor temperature
and outdoor temperature
Approx. 10 min. to 35 min.*
Start FrostWash
Approx. 10 min to 35 min.
*2
*1: Change according
to the outdoor unit.
*2: Change according to indoor temperature
and outdoor temperature
FrostWash Completed
Stop Automatically
Approx. 3 min
*1
Preparation
(Fan mode)
Freezing, defrosting, drying heat
exchanger
• Press “OK” on the wired controller to cancel FrostWash in
the middle of an operation.
• After a cancellation, frost on the heat exchanger needs to
be defrosted and the heat exchanger needs to be dried. The
system cannot start operation for at least 8 minutes after
cancellation.
• You cannot start another FrostWash immediately
after a FrostWash operation completes. Run either
cooling operation, heating operation or dry operation
for approx. 60 minutes. Then, start another FrostWash
operation.
? NOTE
Do not open or remove the air inlet grille during the FrostWash operation.
It may cause injury or damage of units.
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PMML0601 rev.0 - 07/202228