Electrical 13
System Cut-In Pressure
Tank Precharge
1.38 Bar (20 PSI)
1.24 Bar (18 PSI)
2.07 Bar (30 PSI)
1.93 Bar (28 PSI)
2.76 Bar (40 PSI)
2.62 Bar (38 PSI)
The tank pre-charge pressure should always be 0.138
Bar (2 PSI) less than the cut-in (start) pressure (see chart
above).
Changing Pressure Switch Settings
The pressure switch is pre-set to 2 / 3.4 Bar (30 / 50
PSI). The pressure cut-off (pump-stop pressure) can be
changed if required.
To change cut-off (pump stop) and cut-on (pump start)
pressure together:
1. Turn off power to the pump.
2. Remove the cover to the pressure switch.
3. Turn pressure-adjustor #1 clockwise to increase both
cut-off and cut-in pressure. Each turn will change the
pressure setting 0.17 Bar (2.5 PSI). Turn the adjustor
counterclockwise to lower the pressure setting.
4. To raise only the cut-off pressure, turn pressure adjus-
tor #2 clockwise. Each turn will change the pressure
setting 0.17 Bar (2.5 PSI). Turn the adjustor counter-
clockwise to lower the pressure setting.
Checking Pressure Adjustment
1. After changing the pressure setting, put the cover on
the pressure switch.
2. Apply power.
3. If the pump does not start up, open a faucet to drain
water from the pressure tank.
4. Watch the pressure gauge and note at what pressure
the pump starts.
5. Close the faucet.
6. Watch the pressure gauge and note at what pressure
the pump stops.
7. If additional adjustments need to be made, refer to
the previous procedure.
Attach Power
Wires Here
Pressure
Adjustor #1
Pressure
Adjustor #2
Attach Ground
Wire Here
Figure 5 – Pressure Switch.
