Service manual

SiBE06-708_C Control Specification
Function and Control 67
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)

: The same value continues.
Frequency
Compressor
Four way valve
Fan
ON
OFF
ON
OFF
ON
OFF
0 Hz 0 Hz
C Hz
D Hz
5 sec.
K pulse
M pulseJ pulse
Initial opening
PI control
5 sec.
H sec.
(R18152)
Electronic expansion
valve opening
E sec.
F sec.
G sec.
L pulse
RXS25/35F2V1B
RXS25/35G2V1B
RXS25/35G2V1B9
RXS25/35J2V1B
RXS25K2V1B
RXS25K3V1B
RXS35K2V1B
RXS50F2V1B
RXS50G2V1B
RXS50J2V1B RXS50K2V1B
A (minutes)28282828444444
B (°C) 4 ~ 18 4 ~ 18 4 ~ 18 4 ~ 18 4 ~ 12 4 ~ 12 4 ~ 12
C (Hz) 74 76 68 76 55 55 55
D (Hz) 86 86 86 86 90 90 90
E (seconds) 50 50 50 50 60 60 60
F (seconds) 60 60 60 60 120 120 120
G (seconds) 480 480 480 480 340 340 340
H (seconds) 50 60 50 60 30 50 50
J (pulse) 450 450 450 450 450

450

450
K (pulse) 350

350

350 200 450

450

350

L (pulse) 350 
350

400 300 450

450

350

M (pulse) 450 450 450 450 450 
450

450