(9) Compressor checks
COMPRESSOR CHECKLIST
CUSTOMER: ___________________ MODEL: ___________________________ DATE: ___________________
Serial No.: ______________________ Production date: ___________________
Inspector:
_________________________
No. Checking item Check method Result Notes
1
Are THM8 and THM9 properly connected?
THM8 and THM9: discharge gas thermistors
(1) Are the thermistor wires properly connected?
(2) Check
to ensure that the Td1 indication on the 7-
segment display is greater than the Td2 indication when
compressor No. 1 is operating.
Td1: THM8 temperature
Td2: THM9 temperature
2 Are thermistors THM8 and THM9 disconnected?
(1) Check to ensure that the thermistor on the upper part
of the compressor is properly installed.
(2) Check
to ensure that the currently measured
temperature is very different than the (Td1, Td2) indication
during the check mode.
3
Are the current sensor connectors properly
connected?
(1) Check to ensure that the A1 and A2 indication on the 7
segment display is 0 during the compressor stoppage.
(2) Check
to ensure that the A1 and A2 indication is not 0
during the compressor operation (however, A2 is 0 during
the stoppage of compressor No. 2.).
4 Is the current sensor defective?
5 Is the current sensor part of PCB2 defective?
6
Is the direction of the current sensor (CTU, CTV)
reversed?
Visually check the direction.
7
Are power supply cables U and V correctly
inserted in the current sensor?
Check to ensure that the cables are properly inserted.
8
Are expansion valves (MV1 and MVB) properly
connected?
Check to ensure that MV1 to CN10 and MVB to CN12
connections are correct.
9
Are expansion valve (MV1 and MVB) coils
properly installed?
Check to ensure that each coil is properly installed in the
valve.
10
Are the refrigeration cycle and the electrical
wiring system improperly connected?
Check to ensure that refrigerant flows in the indoor units by
operating one refrigeration cycle from the outdoor unit.
11
Is the expansion valve completely closed
(locked)?
Check the following by the outdoor unit check mode.
(1) Liquid
pipe temperature (TL) < Inlet air temperature (Ti)
during the cooling operation.
(2) Liquid pipe temperature (TL) > Inlet air temperature (Ti)
during the heating operation.
12 Is the expansion valve completely open (locked)?
Check to ensure that the liquid pipe temperature is lower
than the inlet air temperature of the stopped indoor unit
when other indoor units are operating in cooling mode.
13
Are the magnetic switch (CMC1 and CMC2)
contacts for compressor defectives?
Visually check the surface of each contact.
14
Is there any voltage anomaly between L1-L2, L2-
L3 and L3-L1?
Check to ensure the voltage imbalance is smaller than 3%.
Take into
account that the power supply voltage must be
within 400 V ± 10%.
15
Is the compressor oil acidified when the
compressor motor has burned out?
Check to ensure that the oil colour is not black.
8 Troubleshooting
272
SMGB0065 rev. 1 - 12/2010
To Next Page
Loading...
