A LOOK AT SERVICE SAFETY
Compressor Motor and Component Information
19
III.
Hermetic Compressor Thermal
Protectors
Hermetic compressor motors are protected from
overheating by thermal protectors built into or
mounted in contact with the compressor motor. See
the Electrical Service Parts Guide Book for correct
replacement thermal protectors. Typical wiring dia-
grams are shown on pages 51 to 82.
The thermal protector device (see Figure 3-8), when
firmly attached to the compressor housing, quickly
senses any unusual temperature rise or excess current
draw. The bi-metal disc within the thermal protec-
tor (see Figure 3-9) reacts to either excess tempera-
ture and/or excess current draw by flexing
downward, and disconnecting the compressor from
the power source.
Figure 3-8.
External thermal protector. (Models AE,
TP, TH, AK, AJ, CAJ, AZ, RK, RG, TW,
and some CL.)
Figure 3-9.
Bi-metal disc.
Open
Closed
Figure 3-10.
AE refrigeration compressor
showing (1) hermetic terminal,
(2) thermal protector, (3) thermal
protector clip, (4) push-on relay,
(5) protective terminal cover, and
(6) bale strap.
Figure 3-11.
AE refrigeration compressor with
the thermal protector and relay
assembled.
