Control Specification
SiUS041829E
54
Part 4 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.
Details
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 (depending on the duration of the previous defrost control) 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
).
09/12 class
18 class
A
(minute)
20 ~ 25
44
B
(°C)
2 ~ 20
6 ~ 12
(°F)
35.6 ~ 68.0
42.8 ~ 53.6
C
(Hz)
64
48
D
(Hz)
64
70
E
(seconds)
40
60
F
(seconds)
60
60
G
(seconds)
120 ~ 630
120 ~ 460
H
(seconds)
50
60
J
(seconds)
8
5
K
(pulse)
400
450
L
(pulse)
300
300 ~ 450
M
(pulse)
350
300
Freq
u
ency
Compressor
Fo
u
r way valve
Fan
ON
OFF
ON
OFF
ON
OFF
0 Hz
0 Hz
C
Hz
D
Hz
J
sec.
PI control
8 sec.
H
sec.
(R21661)
E
sec.
F
sec.
G
sec.
L
p
u
lse zone
Electronic
expansion valve
opening
Normal
control
K
p
u
lse
zone
M
p
u
lse
zone
Starting
control
Summary of Contents for RX09RMVJU9
Page 17: ...SiUS041829E Part 2 Specifications 13 1 Specifications 14 Part 2 Specifications ...
Page 125: ...SiUS041829E Check Part 6 Service Diagnosis 121 18 class R25105 1 2 3 4 Multimeter ...
Page 127: ...SiUS041829E Check Part 6 Service Diagnosis 123 18 class R20704 W V U DC_P1 DC_N1 ...
Page 143: ...SiUS041829E Operation Limit Part 8 Appendix 139 4 Operation Limit RX09 12 18RMVJU9 3D092209E ...
