8 Troubleshooting
316
SMGB0087 rev.0 - 12/2013
Checking procedure for the compressor
CHECK LIST ON COMPRESSOR
Client: Model: Date:
Serie number: Production date: Checker:
No. Check item Check method Result Remarks
1 Is THM9 correctly connected?
THM9: Discharge Gas Thermistor
1. Is wire of thermistor correctly connected by view-
ing?
2. Check to ensure the 7-segment indication of Td
when comp. is operating.
Td: Temperature of THM9
2 Is thermistor THM9 disconnected? 1. Check to ensure that thermistor on the top of
comp. is correctly mounted by viewing?
2. Check to ensure that actually measured tempera-
ture is the same as the indication during check
mode.
3 Is current sensor faulty? 1. Check to ensure that indication A1 and A2 are 0
during compressor stopping.
2. Check to ensure that indication A1 and A2 are not
0 during compressor running.
4 Is current sensing part on PCB2
faulty?
5 Is the direction of current sensor
CTU, CTV) reverse?
Check the direction => by viewing.
6 Are power source wires, U and V in-
serted correctly into current sensor?
Check to ensure that wires are correctly inserted
7 Is expansion valve (MV1) correctly
connected?
Check to ensure that MV1 to CN5A is correctly con-
nected
8 Is expansion valve coil (MV1) cor-
rectly connected?
Check to ensure that each coil is correctly mounted on
the valve.
9 Are the refrigeration cycle and
electrical wiring system incorrectly
connected?
Check to ensure that refrigerant is owing into indoor
units by operating one refrigerating cycle only from the
outdoor unit.
10 Is opening of expansion valve
completely closed (locked)?
Check the following by the check mode of outdoor
units.
1. Liquid pipe temperature (TL) < Air Intake tempera-
ture (Ti) during cooling operation
2. Liquid pipe temperature (TL) > Air Intake tempera-
ture (Ti) during heating operation
11 Is opening of expansion valve fully
opened locked)?
Check to ensure that liquid pipe temperature is lower
than air intake temperature of stopping indoor unit
when other indoor units are operating under cooling
operation.
12 Are the contacts for comp. magnetic
switch CMC1 faulty?
Check the surface of each contact (L1, L2 and L3) by
viewing.
13
Is there any voltage abnormality
among L1-L2, L2-L3 and L3-L1?
Check to ensure that voltage imbalance is smaller
than 3%.
Please note that power source voltage must be within
380V or 220V+10%.
14
Is the comp. oil acidied during
compressor motor burning?
Check to ensure that the oil color is not black.
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