Sanyo 1 852 351 85, Technical & Service Manual

Page: 55 / 164

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
ON ON
OFF
OFF
OFF
OFF
s d n o c e s 5 5 s d n o c e s 0 6
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"