Gardner Denver AUTOSENTRY EAQ99Q Operating And Service Manual page 63

COMPRESSOR OIL SYSTEM CHECK - The following readings are based on ambient temperature of
80° F (27° C) for air-cooled oil cooler and 80° F (27° C) inlet water on water-cooled oil cooler, with the
system in good condition. Compressor should be at operating temperature at the time of checks. One-
half hour of loaded operation is usually sufficient to reach level-out operating temperatures.
Air and Oil Discharge Temperature - 175° F to 195° F (79° C to 91° C) - Read at gauge on the
instrument panel or check with a thermometer at the discharge housing.
Compressor Oil Inlet Temperature - 150° F to 160° F (66° C to 71° C) - Install a tee at the oil filter outlet
and check with a thermometer.
Oil Inlet Pressure - Check at the fitting in the line near the compressor oil inlet. With air receiver
pressure at 100 psi (6.9 bar), oil inlet pressure should be 55 psig to 60 psig (3.8 bar to 4.1 bar).
Oil Cooler Oil Pressure Differential (Air-Cooled Radiator) - Check differential across oil system by
measuring oil inlet pressure as described above.
Oil Cooler Oil Pressure Differential (Water-Cooled Heat Exchanger) – 2 psid to 25 psid (.1 bar to 1.7
bar) (65 psig to 150 psig, 4.5 bar to 10.3 bar receiver pressure) - Check that oil inlet pressure is correct or
measure the differential between drains on the oil cooler shell.
Oil Cooler Temperature Differential (Air-Cooled Radiator) - The oil temperature differential depends
on the temperature of the air at the oil cooler fan and cleanliness of core faces. As ambient temperatures
and core restrictions increase, the oil cooler outlet temperature will increase. The oil inlet temperature is
approximately the same as air discharge temperature - see the gauge on the instrument panel. The
outlet oil temperature may be checked by installing a tee at the oil filter outlet.
Oil Cooler Temperature Differential (Water-Cooled Heat Exchanger) - The oil temperature differential
depends on the inlet water temperature and the water flow rate permitted by the water flow control valve
setting. The oil inlet temperature is approximately the same as the air discharge temperature - see the
gauge on the instrument panel. The oil outlet temperature may be checked by installing a tee at the oil
filter outlet.
Oil Cooler Water Pressure Differential (Water-Cooled Heat Exchanger) - The water pressure
differential through the heat exchanger will depend on the supply pressure, flow rate, cooler tube
cleanliness and outlet pressure. The inlet and outlet water pressure may be checked at the pipe fittings
supplied by the customer.
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