Service manual

13-12
TROUBLESHOOTING
SM CINCO 1-A.1 GB
13.5.8 Checking Compressor
Check Compressor connections - Repair if needed.1)
Check the resistance between the three phases – all three coil resistances should be the same: around 0.788.2)
Check the compressor current while operating to be the same on each wire - In case of abnormal current (no current 3)
or excessive current), the problem could be of driver or compressor – if driver is checked to be operating well ( 13.5.5),
replace the compressor.
Replacing compressor- (14.1.11)
13.5.9 Checking Reverse Valve (RV)
The RV has two parts, Solenoid and valve.
Disconnect the RV connector from the main board and operate the unit in heating mode, check the voltage between two 1)
pins of reverse valve connector, normal voltage is 230VAC - if no power supply to RV, replace outdoor main board.
Check RV operation with direct 230VAC power supply. If RV solenoid is OK (but still no heating operation while 2)
compressor is ON), replace the RV valve from the refrigeration system.if not, replace the RV coil.
Replacing RV Coil (14.1.8.)
Replacing RV Valve - (14.1.10)
Replacing main board - (14.1.13)
13.5.10 Checking Electrical Expansion Valve (EEV)
The EEV has two parts, step motor and valve. Use additional set of valve and coil to check the system.
Check the impedance in the coil wires to be as following:1)
Red/BRN wire to each of the other wires – about 100
Other wires – each one to the others (except Red/BRN) – about 50
When Outdoor unit is powered on, EEV shall have vibration and click sound. If not, replace the coil with the additional 2)
one and check again – turn OFF the unit and than turn it ON, vibration and click sound should be performed. If OK, the
coil was damaged and require to be replaced.
Turn OFF the unit, insert a good coil onto an additional operating valve and turn the unit ON, vibration and click sound 3)
should be performed. If OK, replace EEV valve from the unit.
If both EEV coil and valve are still not operating, replace the ODU main board.4)
Replacing EEV Valve Coil - (14.1.9)
Replacing EEV Valve - (14.1.10.)
Replacing main board - (14.1.13)
13.5.11 Checking Thermistors
Check Thermistor connections and wiring - Replace if needed.1)
Check sensor visually - Replace if needed.2)
Check thermistor sensor attachment to pipe (or other parts), specially pay attention to the spring holding the sensor 3)
towards its sensing part – repair if needed.
Disconnect the connector from the main board and check Thermistor resistance – should be according the charts below 4)
for each sensor. If not in range of 10%, replace thermistor.
If thermistor resistance check is OK but reading is still wrong, replace main board.5)
18.0
COMPESSOR
U
VW
3) Check Compressor motor current