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SiBE12-519
Troubleshooting
Service Diagnosis
165
4.20
Insufficient Gas
Remote
Controller
Display
U0
Method of
Malfunction
Detection
Gas shortage detection I
:
A gas shortage is detected by checking the power consumption value and the compressor
running frequency.
Gas shortage detection II :
A gas shortage is detected by checking the difference between indoor unit heat exchanger
temperature and room temperature as well as the difference between outdoor unit heat
exchanger temperature and room temperature.
Malfunction
Decision
Conditions
Gas shortage detection I
:
Power consumption < 1862 / 256 (A/Hz) × Compressor running fre (-18)
However, when the status of running frequency > 61 (Hz) is kept on for a certain time.
Note : The values are different from model to model.
Gas shortage detection II
:
When the condition of the following 1-3 continued for a certain time.
1. During discharge pipe temperature control
2. Discharge pipe temp. > (255 / 256) × target discharge pipe temp. +20
3. Electronic expansion valve opening (the biggest value among operating units)
≥
450
If a gas shortage error takes place 4 times successively, the system will be shut down. The error
counter will reset itself if this or any other error does not occur during the following 60-minute
compressor running time (total time).
Supposed
Causes
Refrigerant shortage (refrigerant leakage)
Poor compression performance of compressor
Discharge pipe thermistor disconnected, or indoor unit or outdoor unit heat exchanger
thermistor disconnected, room or outdoor air temperature thermistor disconnected
Stop valve closed
Electronic expansion valve defective
Summary of Contents for 2MKS40DVMB
Page 10: ...SiBE12 519 List of Functions 1 Part 1 List of Functions 1 Cooling Only 2 2 Heat Pump 4 ...
Page 15: ...Heat Pump SiBE12 519 6 List of Functions ...
Page 29: ...Heat Pump SiBE12 519 20 Specifications ...
Page 135: ...Instruction SiBE12 519 126 System Configuration ...
Page 211: ...Outdoor Unit SiBE12 519 202 Removal Procedure ...