4 - 8 RTHC-IOM-1C
The gas pump, mounted just beneath the evaporator,
is a cylinder with four ports controlled by two
solenoids. The pump serves to return accumulating
oil in the evaporator to the compressor at regular
time intervals. As the refrigerant-oil mixture enters
the gas pump from the bottom of the evaporator, a fill
solenoid opens to allow refrigerant vapor to be
vented into the top of the evaporator, and is then
closed. A second solenoid then opens to allow
refrigerant at condenser pressure to enter the gas
pump. Simultaneously, a check valve prevents
reverse flow back into the evaporator. A liquid
refrigerant and oil mixture is displaced from the gas
pump cylinder and is directed through a filter to the
compressor. The oil then combines with oil injected
into the compressor and returns to the oil sump via
the oil separators.
Oil Cooler
The oil cooler is a brazed plate heat exchanger
located near the oil filter. It is designed to transfer
approximately one ton of heat from the oil to the
suction side of the system. Subcooled liquid is the
cooling source.
The oil cooler is required on units running at high
condensing or low suction temperatures. The high
discharge temperatures in these applications
increase oil temperatures above the recommended
limits for adequate lubrication and reduce the
viscosity of the oil.
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