Hitachi RAS-25CNH1 - Refrigerating Cycle Checking; Gas Leakage and Compressor Defect Judgment; Troubleshooting Procedure: No Operation;Heating;Cooling

– 112 –
(JUDGING BETWEEN GAS LEAKAGE AND
COMPRESSOR DEFECTIVE)
CHECKING THE REFRIGERATING CYCLE
1. Troubleshooting procedure (No operation, No heating, No cooling)
Connect U,V,W phase leads to the
power module again and operate
the air conditioner.
Is the self-diagnosis lamp mode as
shown on the right?
Stop to operate and check the gas
pressure in balancing mode.
Gas leaks.
Repair and seal refrigerant.
Gas leakage
(Less than 0.39MPaG)
(Less than 4kg/cm
2
G)
When the
self-diagnosis lamp
lights in the same
condition as above.
The compressor is defective. Replace it and
seal refrigerant.
If the compressor checker for an
inverter type air conditioner is
available, re-check using it.
Perform a final check of operation.
Normal
(0.39-0.98MPaG)
(4-10kg/cm
2
G)
Blinking Lit
Lighting mode
Self-
diagnosis lamp
RAC-163CNHZ
LD301
LD302
Time until the
lamp lights
Possible
malfunctioning
part
2-3 seconds
Compressor
Blinks
2 times
Blinks
3 times
Blinks
4 times
Blinks
5 times
Blinks
6 times
Blinks
8 times
Approx.
10
seconds
Within
approx.
30
minutes
Gas
leakage
Approx.
10
seconds
Compressor
YES