Fujitsu ARYG72LHTA - Off Defrost Operation Control

1-19. OFF DEFROST OPEARTION CONTROL
01-17
1. OFF DEFROST OPERATION CONDITION
When operation stops in the [Heating operation] mode, if frost is adhered to the outdoor unit heat
exchanger, the defrost operation will proceed automatically. In this time, if indoor unit operation
lamp flashes slowly (7 sec ON / 2 sec OFF), the outdoor unit will allow the heat exchanger to defrost,
and then stop.
In heating
operation, the outdoor heat exchanger temperature is less than -4°C, and
compressor operation integrating time lasts for more than 30 minutes.
OFF Defrost Flow Chart
Heating operation stop
Outdoor heat exchanger temp. :
Below -4°C
and
Compressor integrating operation :
Over 30 minutes
Defrost start
Defrost Indicator:
[Operation lamp]
6 sec ON / 2 sec OFF
or
Compressor ON time : Maximum 15 minutes
Defrost end
2. OFF DEFROST RELEASE CONDITION
Release Condition
or
Compressor operation time has passed 15 minutes.
( Table 15 : OFF Defrost Release Condition )
OFF defrost operation is released when the conditions becomes as shown in Table 15.
After compressor operation time passed for 1 minute, when
a high-pressure sensor detected more than 2.09MPag.
.
After compressor operation time passed for 1 minute, when
a high-pressure sensor detected more than 2.09MPag.