Troubleshooting
SiENBE04-925_A
112
Service Diagnosis
4.24 Refrigerant Shortage
Remote Control
Display
U0
Method of
Malfunction
Detection
Refrigerant shortage detection I:
Refrigerant shortage is detected by checking the input current value and the compressor
running frequency. If the refrigerant is short, the input current is smaller than the normal value.
Refrigerant shortage detection II:
Refrigerant shortage is detected by checking the discharge pipe temperature and the opening of
the electronic expansion valve. If the refrigerant is short, the discharge pipe temperature tends
to rise.
Refrigerant shortage detection III:
Refrigerant shortage is detected by checking the difference between suction and discharge
temperature.
Malfunction
Decision
Conditions
Refrigerant shortage detection I:
The following conditions continue for 7 minutes.
<20/25 class>
Input current × input voltage
≤
× output fre
Output frequency >
<35 class>
Input current
≤
× output fre
Output frequency >
Refrigerant shortage detection II :
The following conditions continue for 80 seconds.
Opening of the electronic expansion valve
≥
Discharge pipe temperature >
× target discharge pipe tempe
(–)
(W)
(Hz)
20 class
640/256
0
55
25 class
3446/256
–346
48
(–)
(A)
(Hz)
35 class
18/1000
0.7
55
(pulse)
(–)
(°C)
20 class
480
128/128
30
25 class
450
128/128
40
35 class
480
128/128
cooling: 20, heating: 45
SIENBE04-925_A_FRONT.pdf 127
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Summary of Contents for RXL25G2V1B
Page 8: ...SiENBE04 925_A vi Table of Contents ...
Page 14: ...Introduction SiENBE04 925_A xii ...
Page 15: ...SiENBE04 925_A List of Functions 1 Part 1 List of Functions 1 Functions 2 ...
Page 17: ...SiENBE04 925_A Specifications 3 Part 2 Specifications 1 Specifications 4 ...
Page 20: ...Specifications SiENBE04 925_A 6 Specifications ...
