Frostwash; About Frostwash; Start Frostwash - Hitachi PC-ARFG-E Installation & Operation Manual

FUNCTION MENU

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 configured
on outdoor units.
Please refer to the dedicated Service Manual for the FrostWash
function.
Please configure function selection F1 on the outdoor units, and
then set the wired remote controller.
Please also refer to the Operation Manual and Service Manual
of Wired Remote Controller for details.
Please contact the distributor or service personnel for availability
and configuration 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
flow 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 humidifier 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
o o
the range of (15 C - 30 C).
o o
• 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.
27 PMML0565 rev.0 - 09/2021

5.13.2 Start FrostWash

Generate frost on the coil and then melt the frost to wash the
coil.
FrostWash setting is not enabled on the factory default setting.
Refer to
"5.13.5 FrostWash Setting"
Start FrostWash
Approx. 3 min.* Approx. 10 min. to 35 min.*
*1: change according *2: change according to indoor temperature
to the outdoor unit and outdoor temperature
Preparation
Freezing, defrosting, drying
(Fan mode)
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
cancelation.
• You cannnot 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.
?
N O T E
Do not open or remove the air inlet grill during the FrostWash operation. It
may cause injury or damage of units.
to enable this function.
FrostWash Completed
Stop Automatically