5-8. Defrosting Operation (Heating)
■
Reverse-cycle Defrosting
Heating operation
Frost detection
Reverse-cycle defrosting operation
Defrosting Sequence
Releasing of defrosting
●
Compressor ON
●
4-way valve ON
Frosting is assumed mostly under the following condition.
●
Integrated operating time of compressor is longer
than 3 hours.
●
Defrosting operation lasts 8 to 12 minutes (maximum).
●
Compressor current during reverse-cycle defrosting
operation exceeds certain ampere.
●
●
●
●
Compressor
➞
ON
Outdoor fan
➞
OFF
4-way valve
➞
OFF
Indoor fan
➞
Cold draft prevention mode
●
Indoor heat exchanger coil temperature drops 0.8
°
C
per 6 minutes and it repeats 3 times in succession.
●
Temp. of indoor heat exch. coil immediately before
thermo goes off is below Td + 5.6
°
C, etc.
●
NOTE
The values shown as Td differs according to the models.
7000 BTU/h
Td
35
°
C
38
°
C
44
°
C
9000 BTU/h 12000 BTU/h
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