25. DEFROST OPERATION CONTROL
2. CONDITION OF THE DEFROST OPERATION COMPLETION
Defrost operation is released when the conditions become as shown in Table 18 .
( Table 18-1 : Defrost release condition )
For AOU18RLXFZH
For AOU24RLXFZH
Release Condition
Outdoor heat exchanger temperature sensor value is higher than 53.6°F(12°C) or
Compressor operation time has passed 15 minutes.
( Table 18-2 : Defrost release condition )
Release Condition
Outdoor heat exchanger temperature sensor value is higher than 60.8°F(16°C) or
Compressor operation time has passed 15 minutes.
1. CONDITION OF STARTING THE DEFROST OPERATION
The defrost operation starts when the outdoor heat exchanger temperature sensor detects
the temperature lower than the values shown in Table 16, 17 .
( Table 16 : Condition of starting defrost operation )
1-1 NORMAL DEFROST
Normal defrost
Less than 35 minutes
Does not operate
Compressor integrating operation time
More than 35minutes
Outdoor heat exchanger temp. < 1.4°F(-17°C)
(at outside air temp. > 14°F(-10°C)
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.
More than 210 minutes
( For continuous operation )
Less than 10 minutes
( For intermittent operation )
Compressor integrating operation time
When the compressor is
stopped, If detected
outside air temp. at 35.6°F(2°C)
OFF count of the compressor
40 times
( at outside air temp. < 35.6°F(2°C))
1-2. INTEGRATING DEFROST
( Table 17 : Condition of starting defrost operation )
01-25
Outdoor heat exchanger temp. < Outside air temp.-(30.6°F(17°C))
or Outdoor heat exchanger temp. < -13°F(-25°C)
(at 4°F(-20°C) < outside air temp. < 14°F(-10°C))
Outdoor heat exchanger temp. < Outside air temp.-(30.6°F(17°C))
Tn - Tn10 < - 41°F(5°C) but Tn < 42.8°F(- 6°C)
(Outdoor heat exchanger temp. detected for every 5 minutes )
Tn - TnA < - 35.6°F(2°C) but Tn < 42.8°F(- 6°C)
(Outdoor heat exchanger temp. detected for every 5 minutes )
or Outdoor heat exchanger temp. < -22°F(-30°C)
(at outside air temp. < 4°F(-20°C))
=
=
=
=
=
=
=
Tn : Outdoor heat exchanger temp.
Tn10 : Temperature of continuous operation at 10 minutes.
TnA : Back 5 minutes temperature.
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