
SiBE04-624_B Control Specification
Function and Control 63
2.11 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 25 minutes of accumulated time pass after the start of the operation, or ending
the previous defrosting.
Conditions for Canceling Defrost
The judgment is made with outdoor heat exchanger temperature. (6 ~ 22°C)
Frequency
Compressor
Four way valve
Fan
ON
OFF
ON
OFF
ON
OFF
0Hz
64 Hz
30 Hz
8 sec.
200 pulse
400 pulse450 pulse
Initial opening
PI control
8 sec.
70 sec.
(R18154)
Electronic expansion
valve opening
50 sec. 620 sec.
0Hz
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