Mechanical Design
9
As an alternative to the Delta-P or the Johnson Controls P545, compressors with oil pumps may
use an externally mounted oil differential pressure switch with tubing connections to compressor
suction and the discharge of the oil pump. Applicable switches would include the Danfoss MP54
and the Johnson P128CA. The following table lists technical information for the Differential Oil
Pressure Switch:
Differential Oil Pressure Switch Technical Data
Supply Voltage
230/115 VAC +/- 10%, 50/60 Hz
Time Delay with Low Oil Pressure
90 s
Control Relay
250 V max.
2 A max.
Fusing for device and switch contacts
6 A max.
Refrigerants
All typical CFC’s, HCFC’s and HFC’s
Differential Cutout Pressure
9 psi
Содержание Ingersoll Rand
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