Liquid Line Filter Drier; Top Cap Switch Operation - Lennox EL23XCV Series Manual

Liquid Line Filter Drier (EL23XCV-060 Scroll compressor model only)
The EL23XCV-060 has a scroll compressor and a liquid line filter drier that is factory-installed in the liquid line. The filter
drier is designed to remove moisture and foreign matter, which can lead to compressor failure.
FIGURE 38. Liquid Line Filter Drier
Top Cap Switch Operation, Checkout and Status / Error Codes
OPERATION:
Top Cap Thermal Sensor Switch (S173)
Some units are equipped with a compressor-mounted normally closed temperature switch that prevents compressor
damage due to overheating caused by internal friction. The switch is located on top of the compressor casing. This switch
senses the compressor casing temperature and opens at 239-257°F to shut off compressor operation. The auto-reset
switch closes when the compressor casing temperature falls to 151-187°F, and the compressor is re-energized. This is a
single-pole, single-throw (SPST) bi-metallic switch.
COMPRESSOR TOP CAP SWITCH
(SPST BI-METALIC SWITCH,
NORMALLY OPENS AT 239-257ºF,
AND CLOSES AT 151-187ºF
SWITCH COVER
TOP OF COMPRESS0R
FIGURE 39. Top Cap Thermal Sensor Switch
CHECKOUT:
Using a multimeter set to ohms, with the terminals disconnected from the system, check the resistance between the two
terminals of the top cap switch. If the meter display does not change, the switch is closed. If the meter display goes to
infinite, the switch is open.
FIGURE 40. Verifying Top Cap Thermal Sensor Switch
STATUS:
None
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