Machine Compartment Components (continued)

Starting Device Operation

The starting device is an assembly consist- ing of an overload (1) and a PTC relay (2). The PTC relay is composed of a semi con- ductive substance formed in the shape of a disk (2). The disk is connected in series with the run and start terminals which in turn con- nect to the run and start windings. The resis- tance of the disk material is relatively low at room temperature. When voltage is applied and current flows to the compressor wind- ings, the current flowing to the start winding heats the disk material. As the temperature of the disk increases, the resistance of the disk increases rapidly and limits current flow to the start winding. At the same time cur- rent flow through the disk is decreasing, the effects of current flow through the run capacitor increases. This change in current and capacitance seen by the start winding helps start the compressor and allows the start winding to remain in the circuit once the compressor is running.

1

Semi Conductor Disk

S

M

2

NOTE: Do not disassemble the PTC device. The PTC device (2) was opened to show the inte- rior construction and to assist in explaining the theory of operation

Checking the PTC: The easiest way to check the PTC device is to replace it with a known good one. If a new PTC device is not available, a resistance check can be made.

1.Disconnect power to the refrigerator.

2.Disconnect the starting device from the compressor.

3.Unplug the run capacitor form the module.

4.Connect an Ohmmeter across the L and S terminals.

5.If the PTC is at ambient temperature, 70

– 80 degrees F., the approximate resistance should be between 3 and 10

OHMs. An infinite reading indicates the

 

PTC device is open.

3

6-3

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Whirlpool GSF26C5EXW, GSS26C5XXW manual Semi Conductor Disk, Starting Device Operation
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GSF26C5EXW, GSS26C5XXW specifications

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