Fujitsu AOCG040LBTA, Service Instruction

Page: 21 / 67

20. DEFROST OPERATION CONTROL
1. CONDITION OF STARTING THE DEFROST OPERATION
The defrost operation starts as shown in the following Table 16.
2. CONDITION OF THE DEFROST OPERATION COMPLETION
Release Condition
Outdoor heat exchanger temperature sensor value is higher than +16°C or
Compressor operation time has passed 15 minutes.
Defrost operation is released when the conditions become as shown in Table 17.
(Table 17 : Defrost Release Condition)
(Table 16 : Condition of starting Defrost Operation )
Integrating defrost
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.
Normal defrost
Compressor integrating operation time
Less than 40 minutes More than 40 minutes
Does not operate
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
(at outside air temp. < -10°C)
More than 240 minutes
(For continuous operation)
Less than 10 minutes
( For intermittent operation )
Compressor integrating operation time
Outdoor heat exchanger
temperature below -3°C
More than 213 minutes
(For continuous operation)
Outdoor heat exchanger
temperature below -5°C
OFF count of the compressor
40 times
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