Defrosting Operation (Heating) - Sanyo SAP-K77GHAX Technical & Service Manual

8-9. Defrosting Operation (Heating)

Reverse-cycle Defrosting
Defrosting Mode Timing Chart
Start of defrosting
Compressor ON
Outdoor fan
Solenoid coil
(4 – way valve)
Indoor fan
Auto air sweep
(when selected)
NOTE *1: Refer to "8-5 Cold Draft Prevention"
Compressor ON
4-way valve ON
Frosting is assumed mostly under the following condition.
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.
Integrated operating time of compressor is longer
than 3 hours, etc.
Reverse-cycle defrosting operation
Compressor
Outdoor fan
4-way valve
Indoor fan
Defrosting time is determined by the elapsed time
which vary with certain condition. (That is: indoor
fan speed, condition of frost detection etc.)
6 0 s e c o n d s
Compressor ON
OFF ON
2 sec.
ON
55 sec.
ON
ON
ON
Defrosting Sequence
Heating operation
Frost detection
ON
OFF
OFF
OFF
Releasing of defrosting
Release of defrosting
5 5 s e
ON OFF
OFF
OFF
60 seconds
OFF
OFF
53
Release of
cold draft prevention
c o n d s
ON
1
ON
ON
ON
ON