Carrier 30RAP010-060 specifications a30-4971, Electronic Expansion Valve Details

INCLUDED IN CABLE KIT

CABLE

CABLE RETAINER

MOTOR ADAPTER

ASSEMBLY

GASKET

SIGHTGLASS

SPORLAN

a30-4971

CABLE

MOTOR AND

ADAPTER

ASSEMBLY

FLOWNORMAL

DIRECTIONFLOW

DIRECTION

CABLE

RETAINER

MOTOR ADAPTER ASSEMBLY

Fig. 24 — Electronic Expansion Valve Details

During the next several seconds, carefully connect the nega- tive test lead to pins 1,2,4 and 5 in succession (plug J6 for Cir- cuit A, plug J7 for Circuit B). Digital voltmeters will average this signal and display approximately 6 vdc. If it remains con- stant at a voltage other than 6 VDC or shows 0 volts, remove the connector to the valve and recheck.

Press ENTER and select 0% to close the valve. Check the 4 po- sition DIP switch on the board (all switches should be set to On). If a problem still exists, replace the EXV module. If the reading is correct, the expansion valve and EXV wiring should be checked. Check the EXV terminal strip and interconnecting wiring.

1.Check color coding and wire connections. Make sure they are connected to the correct terminals at the EXV driver and EXV plug and that the cables are not crossed.

2.Check for continuity and tight connection at all pin terminals.

3.Check the resistance of the EXV motor windings. Re- move the EXV module plug (J6 for Circuit A, J7 for Cir- cuit B) and check the resistance of the two windings be- tween pins 1 and 2 for one winding and pins 4 and 5 for the other winding (see Fig. 25). The resistance should be 100 ohms ± 10 ohms.

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FIELD SERVICING INSTRUCTIONS — The EXV valves on sizes 025, 030, 050-060 can be serviced. The EXV valves on all other sizes are hermetic and cannot be disassembled for installation or during service, however, the cable and retainer may be replaced if necessary. Motor kits for the EXV valve are available as replacement parts.

To remove the valve from the system, perform the follow- ing procedure:

1.Be sure the refrigerant has been recovered from the circuit.

2.Disconnect the line voltage to the valve controller. Dis- connect the valve wires from the controller.

3.If the motor fails to operate properly, check the resistance of each motor phase. Resistance between black and white leads or between the red and green leads should be ap- proximately 100 ohms. Differences of more than 10% be- tween phases indicate a defective motor. Resistance be- tween black and red, or any lead and piping, should be in- finite or “open”. Any resistance reading will indicate a shorted winding and the valve will need to be replaced.

4.The output of the controller to the valve can be tested with the following procedure:

a. Disconnect supply voltage to the controller.