Outdoor Unit: Checking The Expansion Valve - Daikin Sky Air R-407C Service Manual

ESIE02–01
5.7

Outdoor Unit: Checking the Expansion Valve

Checking To check the electronic expansion valve, proceed as follows:
Step
1
2
3
4
5
6
Part 3 – Troubleshooting
Action
Check if the expansion valve connector is correctly inserted in the X24A of PCB 1.
Compare the expansion valve unit with the number of the connector to make sure it is cor-
rectly connected.
Switch the power OFF.
Switch the power ON to check whether the expansion valve is producing a clicking sound.
If...
The expansion valve has no
clicking sound
Check the coil current: Open circuit < normal < short circuit
The table below contains the reference resistance values.
—
Grey
—
Grey
40-50 Ω
Black
40-50 Ω
Yellow
40-50 Ω
Red
40-50 Ω
Orange
Check the clicking sound again.
If...
There is a clicking sound
There is no clicking sound
There is still no clicking sound
Additional Checks for Troubleshooting
Then...
Disconnect the valve connector without the
clicking sound and proceed to step 5.
Black Yellow
40-50 Ω 40-50 Ω
— 80-100 Ω
80-100 Ω —
80-100 Ω 80-100 Ω
80-100 Ω 80-100 Ω
Then...
The expansion valve works properly.
Replace the expansion valve unit.
Replace outdoor PCB 1.
Red Orange
40-50 Ω 40-50 Ω
80-100 Ω 80-100 Ω
80-100 Ω 80-100 Ω
— 80-100 Ω
80-100 Ω —
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