Checking The Electronic Expansion Valves - LG Multi V5 Service Manual

CHECKING THE ELECTRONIC
EXPANSION VALVES
Checking the Electronic Expansion Valves, continued.
Component Problem
EEV locks up.
Indoor Unit /
Outdoor Unit
Incomplete EEV connection or
assembly.
EEV is closed, but valve is
Indoor Unit
EEV motor coil has shorted out or
has disconnected.
Outdoor Unit
118
Check for a locked EEV, if the system is in a no-load state,
if the driving motor is rotating, and a clicking sound can be
heard.
1. Check if the pin is fully inserted into the connector.
2. Check the color of the wiring; verify that the correct wire is
connected.
3. Remove the connector from the control board, and test the
connection.
1. Operate one indoor unit in fan mode, and then operate
another indoor unit in cooling mode.
2. Check the liquid piping temperature of the indoor unit in fan
mode (through the outdoor unit control board).
3. Check if the fan is rotating and the EEV is closed. If there
leaking. is a leak, the liquid piping temperature at the indoor unit in fan
mode will be low.
If the measured temperature is very low when compared to
the suction temperature (that is displayed at the remote
controller), then the EEV is not fully closed.
Check the resistance between the coil terminals (red-white,
red-orange, brown-yellow, brown-blue).
1. Check the resistance between the coil terminals at the
subcooling EEV (red-white, red-yellow, red-orange, red-blue).
the EEV is normal.
1. Check the resistance between the coil terminals at the main /
IV EEV (red-white, red-orange, brown-yellow, brown-blue).
EEV is normal.
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Diagnosis Solution
Replace EEV.
Find the incomplete
connection or assembly,
and service accordingly.
If the amount that
is leaking is excessive,
replace the EEV.
Replace EEV.
Replace EEV coil.
Replace EEV.