Control Specification SiBE041102_A
30 Function and Control
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 are 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 28 minutes of accumulated time have passed since the start of the operation, or
ending the previous defrosting.
Conditions for Canceling Defrost
The judgment is made with outdoor heat exchanger temperature. (4 ~ 22°C)
25 class 35 class
A (Hz) 68 72
B (Hz) 80 84
C (Hz) 88
D (seconds) 40
E (seconds) 60
F (seconds) 510
G (seconds) 40
H (pulse) 470
J (pulse) 390
K (pulse) 430
L (pulse) 470
Frequency
Compressor
Four way valve
Fan
0Hz
A Hz
C Hz
B Hz
5 sec.
J pulse
K pulse
L pulseH pulse
Initial opening
PI control
5 sec.
G sec.
(R14569)
Electronic expansion
valve opening
D sec.
E sec.
F sec.
ON
OFF
ON
OFF
ON
OFF
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