Pentair PSC-14-4-02 Installation And Operation Manual page 6

INSTALLATION & OPERATION
CHECK PUMP PRESSURE SWITCH SETTING
1. To check pressure switch setting, disconnect power to
pump at supply panel (but be sure to leave pressure switch
connected to power supply wires).
2. Remove pressure switch cover.
3. Open a faucet near tank.
4. Allow water to drain until pressure switch contacts close;
immediately close faucet.
5. Check pressure at valve with standard tire gauge or with
pump pressure gauge (if supplied).
6. Pressure gauge should read 4 psig below pump cut-in
setting (26 psig for 30-50 switch, 16 psig for 20-40 switch,
etc.) If not:
Adjust switch according to switch

manufacturer's instructions.
Reconnect power supply to pump and pump up

pressure in system.
Disconnect power supply to pump again and re-check

switch setting.
Repeat until pressure switch starts pump within ±1 psig

of proper setting.
If cut-in setting is too low, system will rattle or develop

water hammer when pump starts.
Cut-out setting is not as critical as cut-in setting. Make

sure that pump will stop running in a rea son able time.
If it does not, cut-out setting may need to be adjusted
down slightly. Be sure that after readjustment, system
does not rattle or hammer on startup.
7. Re-check tank air pre-charge to be sure it is 4 psig below
pump pressure switch cut-in setting.
TESTING FOR AIR CELL LEAKAGE
1. Disconnect power to pump.
2. Drain all water from tank by opening faucet closest to tank.
3. Remove Pole Piece Cap w/ Valve Cap from Valve Stem and
charge air cell.
4. Check air pressure after 24 hours. If air cell leaks, pressure
will drop. If so, replace air cell.
Figures 4, 5 and 6 depict typical tank installations
6
To Household
Water System
Relief Valve
Pressure
Switch
From Well
Figure 4: Typical Installation with Jet Pump
Pressure
Gauge
Relief
Valve
To
Service
Pressure
From Switch
Submersible
Pump in Well
Figure 5: Typical Installation with Submersible Pump
Relief
Valve
Floor
Drain
Figure 6: Typical Installation with Vertical Multi-Stage Pump
Check Valve
Floor
Drain
5896 0112
Pressure
Pressure
Switch
Gauge
To
Service
40 60
20
80
10 0
Pressure
Check
Regulator
Valve
CH21086 (08/01/21)