HVAC Troubleshooting Guide by Rex Miller

Author:Rex Miller
Language: eng
Format: epub, pdf
Publisher: McGraw-Hill Education
Published: 2009-08-16T16:00:00+00:00

Figure 9-24 External view of the AJ compressor. (Courtesy of Tecumseh.)

the motor. This one has an internal thermostat to interrupt the control circuit to the motor contactor. The contactor then disconnects the compressor from the power source. Figure 9-32 shows the location of the internal thermostat.

Figure 9-25 Snap-on terminal cover assembly. (Courtesy of Tecumseh.)

Figure 9-26 An antislug feature is standard on all AJ1M12 models and on larger models of the AJ series. (Courtesy of Tecumseh.)

Figure 9-27 Permanent split-capacitor schematic. (Courtesy of Tecumseh.)

There is a supplementary overload in the compressor terminal box so it can be reached for service (see Fig. 9-33). A locked rotor or another condition producing excessive current draw causes the bimetal disk to flex upward. This opens the pilot circuit to the motor contactor.

The contactor then disconnects the compressor from the power source. Single-phase power requires one supplementary overload (see Fig. 9-34). Three-phase power requires two supplementary overloads (see Fig. 9-35). This CL line of compressors uses R-22 and R-12 (R-134a) or its suitable substitute refrigerants. They also use an oil charge of either 45 or 55 oz. In some cases, when the units are interconnected, they use 65 oz.

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