27
YES
YES
YES
YES
YES
YES
YES
4) DEFROSTING OPERATION (Heating)
• When the capacity of the unit has been decreesed due to frosting up of the outdoor heat exchanger during
heating, the temperature drop gradient is detected by the microcomputer-controlled temperature sensing
system, and defrosting operation is started.
DEFROSTING FLOWCHART
Compressor ON
Integrated operating time of
compressor is longer than
3 hours
Integrated operating time of
compressor is longer than
1.5 hours
Thermo OFF
(Compressor OFF)
Temperature of indoor heat
exchanger coil is lower than
53°C.
Thermo ON
(Compressor ON)
Defrosting thermo in the
outdoor unit is OFF.
(Below 4°C)
Defrosting begins.
Cold-draft prevention.
Release of defrosting.
Temperature of outdoor heat
exchange coil is higher than
12°C.
Defrosting time is over
11.5 minutes.
Temperature of indoor heat
exchanger coil is lower than
45°C
Temperature in indoor heat
exchanger coil drops 0.8
deg/6 min. or more and
repeats 3 times continuously.
Integrated operating time of
compressor is more than
20 minutes.
Compressor keeps running
for 5 minutes
A B C
NO
