Defrosting Operation (Heating) - Sanyo CH0951 Technical & Service Manual

8-7. Defrosting Operation (Heating)

Defrosting Flowchart
Release of overload prevention
(Outdoor fan operates.)
A
Outdoor fan is either operated
or stopped for more than 10
minutes.
Is outdoor fan continuously
NO
operating for more than 10
minutes?
YES
Integrated operating time of
compressor is more than 50
minutes.
Temperature of indoor heat
exchanger coil is below 113 +
23¡F.
Compressor keeps running for
at least 6 minutes.
Compressor ON
Overload
YES
prevention works.
Does outdoor fan
stop?
NO
B
Indoor heat exchanger coil
temperature drops 1.4¡F per
6 minutes and it repeats
3 times in succession.
Temperature of indoor heat
exchanger coil is below 113¡F.
Continuous operating time of
compressor is more than 20
minutes.
Temperature of outdoor heat
exchanger coil is below 48¡F.
Defrosting begins.
Cold-draft prevention
Temperature of outdoor heat
exchange coil is higher than
54¡F.
Release of defrosting
Indoor fan runs at set speed
when temperature of indoor
heat exchanger reads 95¡F.
52
C
Integrated operating time of
compressor is more than 3
hours.
Temperature of indoor heat
exchanger coil is below 113¡F.
Compressor keeps running
for at least 6 minutes.
Defrosting time is over 12
minutes.
D
Integrated operating time of
compressor is more than 1.5
hours.
Thermo. OFF.
(Compressor OFF)
Temp. of indoor heat exch.
coil immediately before thermo
goes off is either below 113 + 7¡F
or 136 + 7¡F (when overload
prevention works).
NO
YES
Compressor keeps running for
at least 6 minutes.