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SiBE07-618_D
Control Specification
Function and Control
37
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.
44 minutes of accumulated time pass since the start of the operation, or ending of the
previous defrosting.
Conditions for Canceling Defrost
The judgment is made with outdoor heat exchanger temperature. (4°C ~ 12°C)
50 class
60 class
A
(seconds)
30
50
Frequency
Compressor
Four way valve
Fan
ON
OFF
ON
OFF
ON
OFF
0 Hz
55 Hz
90 Hz
5 sec.
Initial opening
PI control
5 sec.
sec.
60 sec.
120 sec.
(R12238)
460 sec.
450 pulse
Electronic expansion
valve opening
A