Sinclair SCV-1400EB, Service Manual

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91
Procedure
P4/P5
The power supply is abnormal
Yes
Check the power supply equipment
No
Excess refrigerant
Yes
Discharge part of the refrigerant. Add oil if
it leaks during discharge refrigerant process
No
System contains air or nitrogen
Yes
Flush all refrigerant then vacuum the
system and recharge refrigerant. Add oil to
the system if it leaks
No
The condenser heat exchange is poor 1
Yes
Inspect the system and fix the error
No
The high pressure side is blocked, caused
by crushed or bent pipe or blocked EXV 2
Yes
Inspect the system and fix the error
No
Inverter module has short-circuited 3
Yes
Replace the inverter module
No
Compressor has malfunctioned
4
Yes
Replace the compressor
No
Replace outdoor main PCB
Notes:
1. In heating mode check water side heat exchanger, water piping, circulator pumps and water flow switch for dirt/blockages. In cooling mode check air side
heat exchanger, fan(s) and air outlets for dirt/blockages.
2. High pressure side blockage causes discharge temperature to be higher than normal, discharge pressure to be higher than normal and suction pressure to
be lower than normal.
3. Set a multi-meter to buzzer mode and test any two terminals of P N and U V W of the inverter module. If the buzzer sounds, the inverter module has
short-circuited.
4. The normal resistances of the inverter compressor is 0.124Ω(at 20
℃
ambient temperature) among U V W and infinite between each of U V W and ground.
If any of the resistances differ from these specifications, the compressor has malfunctioned.