![background image](http://html2.mh-extra.com/html/daikin/ftxs35k2v1b/ftxs35k2v1b_service-manual_4199899074.webp)
Troubleshooting
SiBE041213E
63
Service Diagnosis
4.6
Refrigerant Shortage
Error Code
U0
Method of Error
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 lower 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.
Error Decision
Conditions
Refrigerant shortage detection I:
The following conditions continue for 7 minutes.
Input current × input voltage
≤
A
× output fre
B
Output frequency >
C
Refrigerant shortage detection II:
The following conditions continue for 80 seconds.
Opening of the electronic expansion valve
≥
D
Discharge pipe temperature >
E
× target discharge pipe tempe
F
Refrigerant shortage detection III: (35 class only)
When the difference of the temperature is smaller than
G
°C, it is regarded as refrigerant
shortage.
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
Supposed
Causes
Disconnection of the discharge pipe thermistor, indoor or outdoor heat exchanger thermistor,
room or outdoor temperature thermistor
Closed stop valve
Refrigerant shortage (refrigerant leakage)
Poor compression performance of compressor
Defective electronic expansion valve
A
(–)
B
(W)
C
(Hz)
35 class
640/256
0
55
42 class
3446/256
–346
48
50 class
2000/256
–181
55
D
(pulse)
E
(–)
F
(°C)
35 class
480
128/128
30
42 class
450
128/128
40
50 class
480
128/128
cooling: 60, heating: 45
Operation
mode
Description
G
(°C)
Cooling
room thermistor temperature – indoor heat exchanger temperature
4.0
outdoor heat exchanger temperature – outdoor temperature
4.0
Heating
indoor heat exchanger temperature – room thermistor temperature
3.0
outdoor temperature – outdoor heat exchanger temperature
3.0
Содержание FTXS35K2V1B
Страница 12: ...SiBE041213E 1 List of Functions Part 1 List of Functions 1 Functions 2...
Страница 14: ...SiBE041213E 3 Specifications Part 2 Specifications 1 Specifications 4...
Страница 59: ...SiBE041213E Remote Controller 48 Part 5 Remote Controller 1 Remote Controller 49...
Страница 111: ...SiBE041213E Check Service Diagnosis 100 42 class 50 class R12266 Tester 1 2 3 4 Tester 1 2 3 4 R14700...
Страница 113: ...SiBE041213E Check Service Diagnosis 102 42 class 50 class R18241 Power module Power module R16692...
Страница 129: ...Revision History Month Year Version Revised contents 05 2013 SiBE041213E First edition...