8-7. Defrosting Operation (Heating)
■
Defrosting Flowchart
Compressor ON
Indoor heat exchanger coil
temperature drops 0.8
°
C per
6 minutes and it repeats
3 times in succession.
Integrated operating time of
compressor is more than
3 hours.
Defrosting begins.
Cold-draft prevention
Temperature of outdoor heat
exchange coil is higher than
12
°
C.
Release of defrosting
Indoor fan runs at set speed
when temperature of indoor
heat exchanger reads Tc
°
C.
B
Defrosting time is over 12
minutes.
No LL fan operation during this period.
Compressor keeps running
for at least 6 minutes.
Temperature of outdoor heat
exchanger coil is below 9
°
C.
Integrated operating time of
compressor is more than 1.5
hours.
Thermo. OFF.
(Compressor OFF)
C
D
Temperature of indoor heat
exchanger coil is below Ta
°
C
.
Continuous operating time of
compressor is more than 20
minutes.
Outdoor fan is either operated
or stopped for more than 10
minutes.
A
Is outdoor fan continuously
operating for more than 10
minutes?
Integrated operating time of
compressor is more than 50
minutes.
Temperature of indoor heat
exchanger coil is below Ta+
13
°
C
. (See table below.)
Temp. of indoor heat exch.
coil immediately before thermo
goes off is either below
Ta + 4
°
C or Tb + 4
°
C (when
overload prevention works).
NO
NO
NO
YES
YES
YES
Overload
prevention works.
Does outdoor fan
stop?
Compressor keeps running for
at least 6 minutes.
Release of overload prevention
(Outdoor fan operates.)
Compressor keeps running for
at least 6 minutes.
NOTE
NOTE
The values shown as Ta, Tb and Tc
differ according to the models.
MCAV77
Ta
Tb
Tc
*1
*2
*3
35
48
32
38
51
33
44
57
34
MCAV97 MCAV127
*1
*1
*3
*1 & *2
49
