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in the motor shell than in the cooler/oil sump. The motor is protected by a temperature sensor
imbedded in the stator windings. Higher motor temperatures (above 125 F [51 C]) energize a
solenoid to provide additional motor cooling. A further increase in temperature past the motor
override set point will override the temperature capacity control to hold, and if the motor
temperature rises 10° F (5.5° C) above this set point, will close the inlet guide vanes. If the
temperature rises above the safety limit, the compressor will shut down.
Refrigerant that flows to the oil cooling system is regulated by a thermostatic expansion
valve. There is always a minimum flow bypassing the TXV, which flows through an orifice. The
TXV valve regulates flow into the oil/refrigerant plate and frame-type heat exchanger. The bulb
for the expansion valve controls oil temperature to the bearings. The refrigerant leaving the heat
exchanger then returns to the cooler.
Click here for Figure 2A (Front and Rear Views) — Typical 19XL Components —
Design I
Click here for Figure 2B (Front and Rear Views) — Typical 19XL Components —
Design II