Webasto BCT010300C Repair Manual download pdf (Page 35)

Troubleshooting – Refrigerant Compressor

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6.4.2 Checking for Continuity and Proper

Resistance

If no ground fault has been detected using the

procedures in Section 6.4.1, determine whether there is

an open or short circuit in the motor windings or if the

heater element of the thermal protector is open.

Use the procedure in Table 10, “Checking for Proper

Continuity and Resistance,” on page 33 to check the

single phase motor.

Table 10. Checking for Proper Continuity and Resistance

Step 1: Allow Thermal Protector to

Reset

When servicing single compressors with internal thermal protectors, be sure

to allow time for the thermal protector to reset prior to starting these

electrical wiring checks. For some compressors, the internal thermal

protector may take as long as an hour to reset.

Step 2: Check Continuity Check the start winding by measuring continuity between terminal pins C

and S. (See “Identification of Hermetic Terminal” on page). If there is no

continuity, replace the compressor. See “System Cleanup and Compressor

Replacement After Compressor Failure” starting on page 36.

Check the run winding by measuring continuity between terminal pins C

and R. If there is no continuity, replace the compressor.

Step 3: Measure the Resistance Measure the resistance (ohms) between each pair of terminal pins: C and

S, C and R, and S and R. Add the resistance between C and S to the

resistance between C and R. This sum should equal the resistance found

between S and R. A small deviation in this comparison is acceptable.

Proper resistance may also be confirmed by comparing measured resistance

to the resistance specifications for the specific compressor model. Call 1-

800-211-3427 to request resistance specifications. If the resistance is not

correct, replace the compressor. See “System Cleanup and Compressor

Replacement After Compressor Failure” starting on page 36.

If the resistance is correct, leave the leads off and follow the instructions in

the next section to check other compressor electrical components.

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Webasto BCT010300C Repair Manual Page 35