MNL- 0345
Page 92 Section 6 Base Edition
6.2 Electrical Controls and Indicators
6.2.1 Pressure Switch
The automatic switching of the compressor unit off and on is governed by the final pressure switch. The
value of this switch is adjustable. The approximate actuation value (differential) of the final pressure
switch is fixed at whatever pressure setting is required for proper operation of the unit. This switch must
never be set above the original order pressure. If the pressure switch is exposed to system or surge pres-
sures greater than the maximum pressure rating printed on the device nameplate, leakage from the switch
and/or a change of operating set points may result.
6.2.1.1 Operating Set Point Adjustment
Secure the hex body (1) with an open end wrench. Hand turn the adjustment sleeve (2) clockwise to
increase the set point, counterclockwise to decrease the set point (note the orientation of the switch in
Figure 6.2-1). The differential is fixed though the range varies according to the pressure setting.
6.2.1.1.1 Switch characteristics
Adjustable range, final pressure 4000 to 7500 psig
Adjustable range, final pressure (low
1
) 1650 to 4400 psig
Actuation differential range, final pressure 350 to 800 psig
Actuation differential range, final pressure (low
1
) 200 to 500 psig
Contact rating 5 Amps @ 125/250VAC
Temperature range -40° to 165° F
Figure 6.2-1 Pressure Switch
1. Low final pressure setting is optional.
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