Checking The Refrigerating Cycle - Hitachi RAF-50FX8 Service Manual

CHECKING THE REFRIGERATING CYCLE

(JUDGING BETWEEN GAS LEAKAGE AND COMPRESSOR DEFECTIVE)
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?
YES
Stop to operate and check the gas
pressure in balancing mode.
Normal
Checking the power module.
●
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.
Lighting mode
Blinks
2 times
Self･
diagnosis Lamp
LD301
Time until the
Approx. 10 seconds
lamp lights
Possible
malfunctioning
part
Outdoor air
Charge port pressure
temperature
Mpa(G)｛kgf/cm
(℃)
2.96｛30.14｝
50
2.62｛26.72｝
45
2.31｛23.58｝
40
2.03｛20.73｝
35
1.78｛18.14｝
30
1.55｛15.79｝
25
1.34｛13.66｝
20
1.15｛11.74｝
15
0.98｛10.02｝
10
0.83｛ 8.48｝
5
0.70｛ 7.10｝
0
0.58｛ 5.89｝
-5
0.47｛ 4.81｝
-10
（R410A)
Gas leaks.
Repair and seal refrigerant.
Perform a final check of operation.
– 174 –
Blinks Blinks Blinks
3 times 4 times 5 times 6 times
Within
Approx.
approx.
10
30
seconds
minutes
Gas
Compressor
leakage
Blinking
(G)｝
2
Outdoor
unit
Gas leaking
Blinks Blinks
8 times
Approx.
10
seconds
Compressor
Off
Manifold
valve
Lo Hi