Control Specification SiBE041525F
35 Functions 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 defrosting.
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 A 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 the outdoor heat exchanger temperature. (B°C)
.
: The same value continues.
20/25 class 35 class 50 class 60/71 class
A (minute)28282525
B (°C) 4-22 4-22 6-30 6-30
C (Hz) 74 74 48 48
D (Hz) 74 74 42 42
E (seconds) 80 80 60 60
F (seconds) 60 60 60 60
G (seconds) 630 630 460 460
H (seconds) 100 70 60 90
J (seconds) 5 5 8 8
K (pulse) 450 450 450 450
L (pulse) 280-380 280-380 300-450 300-450
M (pulse) 450 450 200 200
Frequency
Compressor
Four way valve
Fan
ON
OFF
ON
OFF
ON
OFF
0 Hz 0 Hz
C Hz
D Hz
5 sec.
PI control
J sec.
H sec.
(R23076)
E sec.
F sec.
G sec.
L pulse zone
Electronic
expansion valve
opening
Normal
control
K pulse
zone
M pulse
zone
Starting
control
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