IM05805004K
Effective January 2003
3.2 Pressure Switch Setting Instructions
Before attempting to set the pressure switch, de-energize the jockey pump controller by opening the Circuit Breaker. This
is done for safety, and so that the jockey pump will not start and interfere with the adjustment procedure.
1.
Set the differential adjustment on the pressure switch to minimum by turning the Differential Adjusting Screw fully
counter clockwise. Set the operating pressure to well below the required pump starting pressure. Turn the Range
Adjusting Screw clockwise to reduce the pressure and observe the scale on the switch.
2.
Bleed the fire protection water system until the pressure is reduced to the required pump starting pressure. Hold this
pressure by closing the drain valve.
3. Slowly rotate the Range Adjusting Screw counter clockwise until a click is heard from the pressure switch. The
switch is now set to the required pump starting pressure.
4. If it is necessary to re-adjust the differential, the operating pressure of the switch will also be changed and should be
reset.
NOTE:
The cut-in (start point) pressure is the cut-out (range adjusting setting) pressure minus the differential setting.
