in the motor shell than in th e cooler/oil sump. The mo to r is protected by a temper at ure sensor
imbedded in the stator win dings. Higher motor te mperatures (above 125 F [51 C]) energize a
solenoid to provide add itional motor coolin g. A further increase in tem per a ture past the motor
override set point will override the temperatu re capacity control to hol d, and if the motor
temperature rises 10 ° F (5.5° C) above this set poi nt , will close the inlet guide vanes. If the
temperature rises ab ov e t he safety limit, the compr e ssor will shut down.
Refrigerant that flows to the oil cooling system is regulated by a thermostatic expansion
valve. There is always a mi nim u m flow bypassing the TXV , which flows through an ori fice. The
TXV valve regulates f low into the oil/refrigera nt plate and frame-ty pe he at exchanger. The bulb
for the expansion valve c ontrols oil tempera ture to the bearings. The r efrigerant leaving the heat
exchanger then returns to the cooler.
Click here fo r Figure 2A (F ront and Rear Views) — Typica l 19XL Compon ents —
Design I
Click here fo r Figure 2B (F ront and Rear Views) — Typica l 19XL Compon ents —
Design II