Airwell DLF 18 DCI, Technical Manual

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13-1
6
TROUBLESHOOTING
SM DL
F 1
-A.1 GB
13.5.10 Checking Reverse Valve (RV)
The RV has two parts, Solenoid and valve.
1) Disconnect the RV connector from the main board and operate the unit in heating mode, check
the voltage between two pins of reverse valve connector on the controller, normal voltage is
230VAC - if no power supply to RV, replace outdoor main board.
2) Check RV operation with direct 230VAC power supply. If RV solenoid is OK (but still no heating
operation while compressor is ON), replace the RV valve from the refrigeration system.if not,
replace the RV coil.
Replacing RV Coil (
14.1.7
)
Replacing RV Valve - (
14.1.10
)
Replacing main board - (
14.1.13
)
13.5.11 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.
1) Check the impedance in the coil wires to be as following:
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2) When Outdoor unit is powered on, EEV shall have vibration and click sound. If not, replace the
coil with the additional 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.
3) Turn OFF the unit, insert a good coil onto an additional operating valve and turn the unit ON,
vibration and click sound should be performed. If OK, replace EEV valve from the unit.
4) If both EEV coil and valve are still not operating, replace the ODU main board.
Replacing EEV Valve Coil - (
14.1.9
)
Replacing EEV Valve -
(14.1.9
)
Replacing main board -
(14.1.13
)
13.5.12 Checking Thermistors
1) Check Thermistor connections and wiring - Replace if needed.
2) Check sensor visually - Replace if needed.
3) Check thermistor sensor attachment to pipe (or other parts), specially pay attention to the spring
holding the sensor towards its sensing part – repair if needed.
4) Disconnect the connector from the main board and check Thermistor resistance – should be
according the charts below for each sensor. If not in range of 10%, replace thermistor.
5) If thermistor resistance check is OK but reading is still wrong, replace main board.