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1
2
3
No
Yes
Big
Small
Heating
Defrosting
RVR2 : OFF
RVR1 : ON
RVR1 : OFF
Outdoor FAN MOF1 : OFF
Temperature Difference
between Outdoor Temperature
and Evaporating Temperature (Te)
at Heat Exchanger
Heating Operation Time
40 Minutes or Above
No
No
Yes
No
Yes
Discharge Gas Pressure
is 1.7MPa or Above
Evaporating Temperature
(Te) at Heat Exchanger is
15°C or Above
Yes
Defrosting Time is
9 Minutes or Above
Defrosting
Completion
Heating
Fixed Opening
Degree of Electronic
Expansion Valve
PID Control for
Super Cooling Electronic
Expansion Valve
RVR2 : ON
Compressor Operating
at Low Frequency
High Frequency
Operation
1 Minute Later
1: Defrost operation signal is transmitted to
the indoor unit during the defrost operation.
After the signal is received, “DEFROST” will
be indicated on LCD of remote control switch
and the indoor fan will be stopped.
2: For the heat recovery system of
190kBtu/h
or
over, RVR1 will not operate.
3: For the heat recovery system of 20HP or
over, switching power ON/OFF of RVR2 will
be performed in each outdoor unit.
Temperature
Conditions
under
Defrosting
Operation
10
15
5
0
-6
-10
-10
-5
-15
-15
-2
Defrosting Operation
Stop Area
Defrosting Operation
Start Area
Outdoor Temp. (
o
C)
Outdoor Evaporating
Temperature (
o
C)
(Pipe)
56 10 15
-21
87
