Of course the Condenser Water (CW) system cannot operate without electricity. But in the event of power failure, a hands-off automatic restart means quick restoration of service without a service call. That does not mean a “turn it all on” approach but a carefully laid out control scheme that sequentially restarts the CW system equipment methodically without draining cooling tower basins or causing water hammering.

For example: In the event of the loss of cooling tower makeup water pressure due to such events as booster pump failure or city water pressure loss the following happens:
  1. An immediate emergency message is emailed and texted to the appropriate parties
  2. The Cooling Tower Water (CTW) bleedoff valve is automatically closed until makeup water is restored.  Then, if the cooling tower float switch determines that the cooling tower basin is near-empty,
   3. The PLC shuts down the CTW pumps to prevent damage to them.
   4. If the CW temperature or pressure exceed their maximum setpoints, the CW pumps shuts down to prevent damage to the CW pumps and non-metal fittings.  Then, when CTW water pressure is restored and the cooling tower basin refills,
   5. The CTW pump(s) restart at low speed and gradually increase speed
   6. The CW pump(s) restart and CW service is restored

If a CW or CTW pump or cooling tower fan motor or VFD fail, the PLC automatically switches to a different pump or fan. An immediate message is sent.

Or, in the unlikely event that the PLC fails, all PLC-controlled equipment reverts to a pre-programmed fixed speed adequate to satisfy the load and immediate messages are sent.

                                                 ALL AUTOMATICALLY!