Sanyo CLM1972 Technical & Service Manual page 56

(6) Electric expansion valve
When replacing the electric expansion valve and coil, be sure to attach the connectors in the correct positions.
Labels are applied to the valve body and coil, corresponding to the connector colors, to identify them.
Controller check
No voltage on circuit board
Check the illumination
of the red Power Lamp.
Replace the controller.
NOTE
Cool the main unit with
a damp cloth or other
means while welding.
When applying
vacuum, use the
special service magnet
and rotate at least 5
revolutions
counterclockwise to
fully open the electric
expansion valve.
*1 If you have manually checked the electric expansion valve, be sure to reapply the outdoor power after you have
replaced the wiring. (The position of the elecric expansion valve will changed.)
Voltage varies
Check the coil resistance.
0 ohm Approx. 46 +/– 4 ohm
Replace the coil.
Open and close the
electric expansion valve
by hand to check it.
No temperature change
Replace the electric
expansion valve.
Use a multi-meter to measure the voltage (12 V).
When the power is turned ON, the needle will move in the
following seguence in approximately 10 to 20 seconds for
each point.
Model No.
CLM1972
CLM2472
CLM3172
Check the resistance between the gray lead
wire and the other wires.
Resistance is OK if it is 46 + / – 4ohm at 68 °F
*1
Temperature changes
This part is normal.
Check elsewhere.
56
Sequence
MV0 MV1 MV2
MV0 MV1 MV2 MV3
Use the special service magnet and
rotate 5 revolutions clockwise to fully
close the valve.
Then start the unit and measure the
temperature at the inlet and outlet
tubes of the electric expansion valve.
If the temperature difference is large,
the valve is closed.
Then rotate 5 revolutions
counterclockwise to open the valve.
Operation is normal if the temperature
difference between the 2 tubes drops.