Defrost Operation Control - Fujitsu ABYG18KRTA Service Manual
Ceiling type air conditioner
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Also See for ABYG18KRTA:
- Design & technical manual (113 pages) ,
- Service manual (482 pages) ,
- Design & technical manual (440 pages)
Table of Contents
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
Condition
– 2nd time and after
• Models: AOYG18KBTB, AOYG22KBTB, and AOYG24KBTB
Compressor integrating
operation time
Condition
• Models: AOYG30KBTB, AOYG36KBTB, and AOYG45KBTB
Compressor integrating
operation time
Condition
– Integrating defrost (Constant monitoring)
Compressor
integrating
operation time
Condition
*: 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.
Less than 17 min.
Does not operate
Less than 40 min.
Does not operate
Less than 35 min.
Does not operate
More than 240 min.
(For long
18/22/24 model
continuous
operation)
More than 240 min.
(For long
30/36/45 model
continuous
operation)
Tn ≤ -3°C
- (04-29) -
17 to 57 min.
Tn ≤ -9°C and Tn-Ta ≥ 5
deg
Tn-Tn10 < -5 deg (Tn ≤ -6°C)
Tn-Tnb < -2 deg (Tn ≤ -6°C)
Tn ≤ -20°C (Ta ≥ -10°C)
Tn ≤ Ta-7°C or Tn ≤ -25°C (Ta <
Tn-Tn10 < -5 deg (Tn ≤ -10°C)
Tn-Tnb < -2 deg (Tn ≤ -10°C)
Tn ≤ -25°C (Ta ≥ -20°C)
Tn < Ta-7°C or Tn ≤ -25°C (Ta <
More than 213 min.
(For long
continuous
operation
More than 215 min.
(For long
continuous
operation
Tn ≤ -5°C
More than 57 min.
Tn ≤ -5°C
More than 40 min.
-10°C)
More than 35 min.
-20°C)
Less than 10 min.*
(For intermittent
operation)
Less than 10 min.*
(For intermittent
operation)
Count of the
compressor off: 40
times
6. Defrost operation control
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