Tecumseh hermetic compressors contain motors designed for specific requirements of starting torqueand running efficiency.
There are four general types of single phase motors, each distinctly different from
the others.
Each type of motor may have two to four different configurations depending on the compressor components.
A. Resistance Start—Induction Run (RSIR) This motor, also known as a split-phase motor, is used on many small hermetic compressors up through 1/3 HP.
The motor has low starting torque and must be applied to completely self-equalizing
capillary tube systems such as household refrigerators, freezers, small water coolers, and dehumidifiers.
This motor has a high resistance start winding which is not designed to remain in the circuit after the motor has come up to speed.
A relay is necessary to perform the function of disconnecting the start winding as the motor comes up to design speed.
Three types of relays are used with this motor:
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