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4-4-61 : Comp. Down by Compression Ratio Control
1.
Cause of problem
Yes
Are the 4Way Valve normally
operating?
Are the Indoor Unit and Outdoor
Unit EEV normally operating?
Is current of compressor normally?
Complete
Commissioning
Replace defective sensor
Check the 4Way Valve
Check the relevant EEV
Compressor Inspection
Check the refrigerant
Yes
Yes
No
Is the S-net estimated value and the
Manifold Gauge value in range?
Connect S-net and Manifold Gauge.
(essential requirement)
No
No
No
No
Outdoor unit display
Indoor unit display
Operation Timer
Criteria
When compression ratio (high pressure+1)/(low pressure+1) less than 1.5 and lasts for 10 minutes or more
Differential pressure (high pressure - low pressure) less than 0.4 MPa.g and lasts for 10 minutes or more
Cause of problem
Indoor and Outdoor EEV breakdown
4Way Valve breakdown
High and Low pressure sensor defective
Refrigerant shortage
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