SiUS12-928_A
Control Specification
Function and Control
52
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
minutes of accumulated time pass since the start of the operation, or ending the
previous defrosting.
Conditions for Canceling Defrost
The target heat exchanger canceling condition temperature is selected in the range of 4 ~ 12°C (39
~ 54°F) according to the outdoor temperature.
The defrost operation operates120 seconds after the start. (A
→
B)
Then the defrost operation stops at the following conditions.
1. When the heat exchanger temperature reaches the target heat exchanger temperature. (B
→
C)
2. When 650 seconds have passed after the start even if the heat exchanger temperature does not
reach the target heat exchanger temperature. (C)
18 class
24/32 class
(minutes)
43
38
(Hz)
54
39
(Hz)
82
62
(seconds)
120
60
(pulse)
450
350
(pulse)
450
400
(pulse)
140
160
Fre
qu
ency
Compressor
Fo
u
r-
w
ay
v
al
v
e
Fan
Electronic expansion
v
al
v
e opening
(operating room)
Electronic expansion
v
al
v
e opening
(stop room)
O
N
A
B
C
OFF
O
N
OFF
O
N
OFF
0 Hz
Hz
5 sec.
450 p
u
lse
0 p
u
lse
PI control
5 sec.
60 sec.
650 sec.
120 sec.
Initial opening
Initial opening
(R12296)
Hz
sec.
p
u
lse
p
u
lse
p
u
lse
Summary of Contents for SUPER MULTI NX G Series
Page 1: ...SiUS12 928_A Applied Models Inverter Multi Heat Pump G Series J Series...
Page 7: ...SiUS12 928_A Table of Contents vi...
Page 10: ...SiUS12 928_A 1 List of Functions Part 1 List of Functions 1 Functions 3...
Page 11: ...SiUS12 928_A List of Functions 2...
Page 17: ...SiUS12 928_A Specifications 8...
Page 23: ...SiUS12 928_A Specifications Specifications 14...
Page 25: ...SiUS12 928_A Printed Circuit Board Connector Wiring Diagram 16...
Page 37: ...SiUS12 928_A Function and Control 28...
Page 69: ...SiUS12 928_A Control Specification Function and Control 60...
Page 71: ...SiUS12 928_A Operation Manual 62...
Page 73: ...SiUS12 928_A Duct Free System Operation Manual 64 2 Duct Free System 2 1 Remote Controller...
Page 84: ...Duct Free System SiUS12 928_A 75 Operation Manual...
Page 85: ...SiUS12 928_A Duct Free System Operation Manual 76 2 8 TIMER Operation...
Page 86: ...Duct Free System SiUS12 928_A 77 Operation Manual...
Page 87: ...SiUS12 928_A Duct Free System Operation Manual 78 2 9 Note for Multi System...
Page 88: ...Duct Free System SiUS12 928_A 79 Operation Manual...
Page 97: ...SiUS12 928_A Slim Duct Built In System Operation Manual 88...
Page 99: ...SiUS12 928_A Service Diagnosis 90...
Page 169: ...SiUS12 928_A Removal Procedure 160...
Page 225: ...SiUS12 928_A Trial Operation and Field Settings 216...
Page 235: ...SiUS12 928_A Appendix 226...