Daikin SUPER MULTI NX G Series, Руководство по обслуживанию

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Troubleshooting SiUS12-928_A
143 Service Diagnosis
5.25 Refrigerant Shortage
Remote
Controller
Display
U0
Outdoor Unit LED
Display A 1 2 3 4
Method of
Malfunction
Detection Refrigerant shortage detection I :
Refrigerant shortage is detected by checking the input current value and the compressor output
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.
Malfunction
Decision
Conditions Refrigerant shortage detection I :
The following conditions continue for 7 minutes.
<18 class>

DC current x DC voltage
≤
x Compressor output fre

Output frequency >
<24/32 class>

DC current
≤
x Compressor output fre

Output frequency >
Refrigerant shortage detection II :
The following conditions continue for 80 seconds.

Opening of the electronic expansion valve
≥

Discharge pipe temperature (°C) > x target discharge pipe temperature (°C) + (°C)
(Discharge pipe temperature (°F) > x target discharge pipe temperature (°F) + (°F))

If the error repeats 4 times, the system is shut down.

Reset condition: Continuous run for about 60 minutes without any other error
Supposed
Causes

Refrigerant shortage (refrigerant leakage)

Poor compression performance of compressor

Disconnection of the discharge pipe thermistor, indoor or outdoor heat exchanger thermistor,
room or outdoor temperature thermistor

Closed stop valve

Defective electronic expansion valve
(–) (W) (Hz)
1756/256 50 55
(–) (A) (Hz)
27/1000 2 40
(pulse) (–) (°C) (°F)
Cooling
450
255/256 20 36.1
Heating 255/256 40 72.1