SiBE041012_B
Control Specification
Function and Control
53
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
A
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 the outdoor heat exchanger temperature. (
B
°C)
25/35 class
RXG50K2V1B RXG50K3V1B
A
(minutes)
28
44
44
B
(°C)
4 ~18
4 ~12
4 ~12
C
(Hz)
76
55
55
D
(Hz)
86
90
90
E
(seconds)
50
60
60
F
(seconds)
60
120
120
G
(seconds)
480
340
340
H
(seconds)
60
50
50
J
(seconds)
5
15
5
K
(pulse)
350
450
450
Frequency
Compressor
Four way valve
Fan
ON
OFF
ON
OFF
ON
OFF
0 Hz
0 Hz
C
Hz
D
Hz
5 sec.
K
pulse
450 pulse
450 pulse
Initial opening
PI control
J
sec.
H
sec.
(R18274)
Outdoor electronic
expansion valve opening
E
sec.
F
sec.
G
sec.
