SiUS042113E
Troubleshooting
Part 6 Service Diagnosis
97
4.7 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 there is insufficient refrigerant, the input current tends to be 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 there is insufficient refrigerant, 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
(°C)
(Discharge pipe temperature >
E
× target discharge pipe tempe
G
(°F))
Refrigerant shortage detection III:
Refrigerant shortage is detected when the difference of the temperature is smaller than
H
(°C (°F))
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
A
(–)
B
(W)
C
(Hz)
09/12 class
2800/256
–350
55
18/24 class
4000/256
–200
38
D
(pulse)
E
(–)
F
(°C)
G
(°F)
09/12 class
470
128/128
cooling: 20, heating: 20
cooling: 68, heating: 68
18/24 class
490
128/128
cooling: 30, heating: 50
cooling: 86, heating: 122
H
09/12 class
18/24 class
Cooling
Room thermistor temperature -
indoor heat exchanger thermistor
(°C)
4.0
3.5
(°F)
7
6
Outdoor heat exchanger
temperature - outdoor temperature
(°C)
4.0
3.5
(°F)
7
6
Heating
Indoor heat exchanger temperature
– room thermistor temperature
(°C)
4.0
3.5
(°F)
7
6
Outdoor temperature – outdoor
heat exchanger temperature
(°C)
4.0
3.5
(°F)
7
6
Содержание FTXM-V Series
Страница 13: ...SiUS042113E Part 1 General Information 9 1 Applicable Models 10 2 Functions 11 Part 1 General Information...
Страница 16: ...SiUS042113E 12 Part 2 Specifications 1 Specifications 13 Part 2 Specifications...
Страница 96: ...Troubleshooting SiUS042113E 92 Part 6 Service Diagnosis Reference Check No 01 Refer to P 134...
Страница 147: ...SiUS042113E Check Part 6 Service Diagnosis 143 09 12 class 18 24 class 1 2 3 4 Multimeter R24538 1 2 3 4 Multimeter...
Страница 150: ...Check SiUS042113E 146 Part 6 Service Diagnosis 18 24 class R24539 DC DC W V U...
Страница 165: ...SiUS042113E Piping Diagrams Part 8 Appendix 161 1 2 Outdoor Unit RXM09 12VVJU RXM18VVJU 3D131979 3D132216...
Страница 166: ...Piping Diagrams SiUS042113E 162 Part 8 Appendix RXM24VVJU 3D132217...
Страница 171: ...SiUS042113E Operation Limit Part 8 Appendix 167 3 Operation Limit RXM09 12 18 24VVJU 3D133582A...
