technical & service manual split system air conditioner

C. Check negative phase relay. (Only for 3-phase model)
• Check negative phase relay to see
if it has operated.
D. Check magnetic contactor.
E. Check indoor PCB Ass'y.
F. Check compressor motor protector.
• Check compressor motor
internal protector. (49C)
YES
YES
• Rewire power supply wires.
• Check coil resistance of magnetic
contactor. (MG)
Outdoor heat exchanger coil
is dirty or there are obstacles
near air suction inlet.
• Clean heat exchanger or
remove obstacles.
(Only for 3-phase model)
• Check compressor motor
overcurrent relay. (51C)
It’s operated.
• Check power supply voltage.
Voltage is abnormally low.
• Check compressor.
There is a possibility of
locked rotor.
NO 90% or more of
rated voltage.
NO
Temperature of compressor is
abnormally high.
YES
Refrigerant gas shortage.
YES
Recover refrigerant. (R407C)
Evacuate the air conditioner.
Charge refrigerant in liquid
state. (R407C)
For compressor replacement
refer to "10-5. In case of
compressor malfunction".
29
CAUTION
In case of leakage, do not
add refrigerant. The unit
must be vacuumed and
recharged. This is because
composition of refrigerant
in the unit has been
changed due to leakage.
See "9-6. In case refrigerant
is leaking".