6. Defrost operation control
Tn: Outdoor unit heat exchanger temperature
Ta: Outdoor temperature
Tn10: Temperature at 10 minutes after compressor start
Tnb: Temperature before 5 minutes
•
Triggering condition
The defrost operation starts when outdoor unit heat exchanger temperature sensor detects the
temperature lower than the values shown below.
–
1st time defrosting after starting operation
Compressor integrating
operation time
Less than 17 min.
17 to 57 min.
More than 57 min.
Condition
Does not operate
Tn ≤ -9°C and Tn-Ta ≥ 5
deg
Tn ≤ -5°C
–
2nd time and after
Compressor integrating
operation time
Less than 40 min.
More than 40 min.
Condition
Does not operate
Tn-Tn10 < -5 deg (Tn ≤ -6°C )
Tn-Tnb < -2 deg (Tn ≤ -6°C )
Tn ≤ -17°C (Ta ≥ -10°C)
Tn ≤ -7°C or Tn ≤ -20°C (Ta < -10°C)
–
Integrating defrost (Constant monitoring)
Compressor integrating
operation time
More than 240 min. (For
long continuous
operation)
More than 213 min. (For
long continuous
operation
Less than 10 min.* (For
intermittent operation)
Condition
Tn ≤ -3°C
Tn ≤ -5°C
Count of the compressor
off: 40 times
*: If the compressor continuous operation time is less than 10 minutes, the number of the com-
pressor off is counted. If any defrost operated, the compressor off count is cleared.
•
Release condition
The defrost operation is released when either one of the conditions below is satisfied.
Outdoor unit heat exchanger temperature
(after 1 minute or later since compressor start)
16°C or more
Compressor operation time
15 minutes
- (04-19) -
6. Defrost operation control
CONTROL AND
FUNCTIONS
CONTROL AND
FUNCTIONS
Содержание AOUG09LMAS1
Страница 4: ......
Страница 5: ...1 GENERAL INFORMATION 2019 12 20 SR_CH01_AS023EF_01 ...
Страница 13: ...2 TECHNICAL DATA AND PARTS LIST 2020 01 28 SR_CH02_AS023EF_01 ...
Страница 33: ...3 TROUBLESHOOTING 2020 01 30 SR_CH03_AS023EF_02 ...
Страница 77: ...4 CONTROL AND FUNCTIONS 2020 03 25 SR_CH04_AS023EF_02 ...
Страница 107: ...5 FILED WORKING 2020 02 03 SR_CH05_AS023EF_01 ...