Hitachi RWM-(H)FSN3E, Руководство по обслуживанию

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12 Troubleshooting
SMGB0070 rev. 1 - 08/2011
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Checking procedure for the compressor
Check list on compressor
Client:___________________________ Model: __________________________ Date: ______________________
Serial No.: _______________________ 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
viewing?
2. Check to ensure the 7-segment indication of
Td when compressor is operating.
Td: temperature of THM9
2 Is thermistor THM9 disconnected?
1. Check to ensure that thermistor on the top of
compressor is correctly mounted by viewing?
2. Check to ensure that actually measured tem -
perature 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 inserted 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
connected
8
Is exp. valve coil (MV1) correctly
connected?
Check to ensure that each coil is correctly moun -
ted on the valve.
9
Are the refrigeration cycle and
electrical wiring system incorrectly
connected?
Check to ensure that refrigerant is flowing 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 outdo -
or units.
1. Liquid pipe temperature (TL) < Control informa-
tion B2 during cooling operation
2. Liquid pipe temperature (TL) > Control informa-
tion B2 during heating operation
12 Are the contacts for compressor
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 compressor oil acidified
during compressor motor burning?
Check to ensure that the oil color is not black.