SiBE041101 Control Specification
Function and Control 44
3.10 Defrost Control
Outline Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor
heat exchanger temperature must be more than a certain value to finish.
Detail Conditions for Starting Defrost
The starting conditions is determined with the outdoor temperature and the outdoor heat
exchanger temperature.
The system is in heating operation.
The compressor operates for 6 minutes.
More than A minutes of accumulated time pass since the start of the operation, or ending the
previous defrosting.
Conditions for Canceling Defrost
The judgment is made with outdoor heat exchanger temperature. (J°C)
20 class 25/35 class 42 class 50 class
A (minutes)28283044
B (Hz) 76 76 48 55
C (Hz) 86 86 70 90
D (seconds)50506060
E (seconds) 60 60 120 120
F (seconds) 600 600 650 460
G (seconds)50603030
H (pulse) 350 350 350 450
J (°C) 4 ~18 4 ~18 4 ~15 4 ~12
Frequency
Compressor
Four way valve
Fan
ON
OFF
ON
OFF
ON
OFF
0 Hz
B Hz
C Hz
5 sec.
H pulse
450 pulse450 pulse
Initial opening
PI control
5 sec.
G sec.
(R13533)
Electronic expansion
valve opening
D sec.
E sec.
F sec.
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