Defrost Operation Control - Fujitsu AS G09LLTB-T Series Service Instruction

19. DEFROST OPERATION CONTROL

1. CONDITION OF STARTING THE DEFROST OPERATION
The defrost operation starts as shown in the following Table 18.
(Table 18 : Condition of starting Defrost Operation)
Normal defrost
Integrating defrost
Integrating & OFF
defrost
2. CONDITION OF THE DEFROST OPERATION COMPLETION
Defrost operation is released when the conditions become as shown in Table 19.
(Table 19 : Defrost Release Condition)
Outdoor heat exchanger temperature sensor value is higher than +16°C or
Compressor operation time has passed 15 minutes.
Less than 25 minutes
Does not operate
Compressor integrating operation time
More than 240 minutes
(For continuous operation)
OU. HEX temperature -3°C
If the compressor continuous operation time is less than 10 minutes,
the OFF number of the compressor is counted.
If any defrost operated, the compressor OFF count is cleared.
Compressor integrating operation time
More than 210 minutes (For continuous operation) and Compressor stopped
OU. HEX temperature -2°C
Release Condition
01-13
Compressor integrating operation time
More than 25 minutes
Outdoor heat exchanger temp. < -17°C
(at outside air temp. > -10°C)
=
Outdoor heat exchanger temp. < Outside air temp.- 7°C
or Outdoor heat exchanger temp. < - 20°C
More than 213 minutes
(For continuous operation)
OU.HEX temperature
=
=
=
(at outside air temp. < -10°C)
Less than 10 minutes
( For intermittent operation )
OFF count of the compressor
-5°C
40 times