Sanyo CLM2472 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 Voltage varies 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. Sequence CLM1972 MV0 MV1 MV2 CLM2472 CLM3172 MV0 MV1 MV2 MV3 Check the illumination of the red Power Lamp. Replace the controller. Check the coil resistance. 0 ohm Approx. 46 +/- 4 ohm Check the resistance between the gray lead wire and the other wires. Resistance is OK if it is 46 + / - 4ohm at 68 °F 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. Replace the coil. *1 Open and close the electric expansion valve by hand to check it. No temperature change Temperature changes Replace the electric expansion valve. This part is normal. Check elsewhere. 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. *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.) 56