Service manual

SiBE07-724_B Control Specification
Function and Control 49
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.

More than A minutes of accumulated time pass since the start of the operation, or ending the
previous defrosting.
Conditions for Canceling Defrost
The judgment is made with outdoor heat exchanger temperature. (L°C)
RK(X)S25/35E2V1B
RK(X)S25/35G2V1B
RK(X)S25/35G2V1B9
A
(minutes) 28 28
B
(Hz) 76 76
C
(Hz) 86 86
D
(seconds) 50 50
E (seconds) 60 60
F (seconds) 600 600
G
(seconds) 50 60
H (pulse) 450 450
J (pulse) 350 350
K
(pulse) 450 450
L
(°C) 4 ~ 22 4 ~ 18
Frequency
Compressor
Four way valve
Fan
ON
OFF
ON
OFF
ON
OFF
0Hz
5 sec.
Initial opening
PI control
5 sec.
(R14090)
Electronic expansion
valve opening
BHz
CHz
F sec.
E sec.
D sec.
H pulse
J pulse
K pulse
G sec.