P-Series Pre-Charge Pump Controls

Overview

The “P” series pump control panel shall be equipped with three pressure switches to automatically control the pre-charged tank’s water pressure level and two liquid level relays for low well cut-off. As water is removed from the tank, the pressure will drop until it reaches the “Lead Pump On” setpoint on Pressure Switch No. 1. The lead well pump will activate and continue to run until the pressure reaches the “Pumps Off” setpoint on Pressure Switch No. 1, at which time the pump will cut off. The control will then alternate the lead pump. If the pressure continues to drop and reaches the “Lag Pump On” setpoint on Pressure Switch No. 2, the lag pump will activate, and both pumps will continue to run until the pressure reaches the “Pumps Off” setpoint again on Pressure Switch No. 1.

The panel shall be equipped with “Low Hydro Pressure” and “Low Well Level” alarms. The “Low Hydro Pressure” alarm shall be sensed by a third pressure switch contained within the panel. If the pressure continues to drop and reaches the “Low Pressure” setpoint on Pressure Switch No. 3, the audio/visual alarms will activate and be latched in until manually reset. The “Low Well Level” alarm shall be sensed by three suspended electrodes in each well. If the well level drops below the “Low Well Level” (Middle) electrode, the well pump(s) will cut out, and the audio/visual alarms will activate and be latched in until manually reset. The well pump(s) will remain locked out until the well level reaches the “Restore” (Top) electrode, at which time the well pumps will be allowed to run again. The “Gnd” (Bottom) probe is for reference purposes only.