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, etc.
Defrosting time is determined by the elapsed time
which vary with certain condition. (That is: indoor
fan speed, condition of frost detection etc.)
Compressor
ON
Outdoor fan OFF
4-way valve
OFF
Indoor fan
OFF
Indoor heat exchanger coil temperature drops 0.8 C
per 6 minutes and it repeats 3 times in succession.
Indoor heat exchanger coil temperature drops below
certain extent.
8-9. Defrosting Operation (Heating)
Reverse-cycle Defrosting
53
ON ON
OFF
Defrosting Mode Timing Chart
ON
ON
ON ON ON
ON
ONON
OFF
OFF
OFF
OFF
sdnoces55sdnoces06
Start of defrosting
Release of defrosting
OFF
Release of
cold draft prevention
Compressor
Outdoor fan
Solenoid coil
(4–way valve)
Indoor fan
Auto air sweep
(when selected)
1
2 sec.
55 sec.
ON ON
60 seconds
Compressor ON
NOTE
*1: Refer to "8-5 Cold Draft Prevention"
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