Duplex Control Panels
Standard Duplex Pump Control
Sequence of Operations:
Each pump is controlled by a Hand-Off-Automatic switch under cover of the door. In the “Hand” position, the respective pump will start and run continuously until the switch is placed in the “Off” position. Selecting the “Automatic” position allows the pumps to be controlled by external level sensors, for example: Float Switches, Pressure Switches or Transducers.
With the liquid level rising, the Stop float, FS1, will close. When the liquid level reaches the Start float, FS2, the lead pump will start, and the liquid level will be pumped down to the Stop float and the pump will stop.
When this happens, the alternator will switch the “LAG” pump to be the lead pump on the next cycle.
If the liquid level continues to rise, with the “Lead” pump running, the “Lag” start float, FS3, will close and start the “LAG” pump. Both pumps will run until the liquid level goes below the “Stop” float. When this happens, the alternator will again switch the lead and lag pumps for the next cycle.
Optional High Water Alarm:
If the liquid level continues to rise, the High Water Alarm float, FS3, will close and cause the High Water Alarm Light to flash as well as activate the High Water Alarm audible alarm. The audible alarm can be silenced via a switch, under cover of the door. However, the alarm light will continue to flash until the liquid level is below the High Water Alarm float level. This resets the alarm circuit.
Note: Selector switches, Run lights etc. can be mounted through the front of the door.
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