Water Cooling System

The recirculating cooling water in the lab employs a heat exchanger, temperature-controlled valve, filter and pump to provide cold water service to equipment. Bending magnets, PIN Diode Pulsars, Sputter Source (SNICS), Tandem are some of the equipment that require cooling to remain in operation. The recirculating loop is automatically topped off by city or chilled water depending on availability. Should there be an interruption of water service to the building the following instructions apply. The valves are located in the Southeast corner of the Tandem Vault.

When Chilled Water Service is Interrupted

Open the two valves labeled “city water” and close the two valves labeled “chilled water”. This changes the heat exchanger over to city water in for cooling the recirculating loop and then out to a drain. Change the recirculating water top off valve to the position labeled “city”.

When Chilled Water Service Returns

Open the two valves labeled “chilled water” and close the two valves labeled “city water”. This changes the heat exchanger back to chilled water for cooling the recirculating loop.

Recirculator Pump Goes Off and Will Not Restart

The recirculating loop can be fed directly by city water in an emergency situation. The valves C1 and D1 are located in the Southeast corner of the Tandem Vault. The valves C2, D2 and D3 are located in the Gas Handling Room (see Figure). C2 and D3 are located by the L.E. vault entrance and D2 is located near the floor at the middle of the East wall. To bypass the recirculating loops water pump first ensure its power switch, positioned on the wall over the pump, is turned off. Close the valves C1 and C2. Open valve D1 and D2 first and then open D3. When the recirculator pump is operational again it should be placed back into service. Close valve D3 first and the close D1 and D2. Open valves C1 and C2. Now turn the recirculating pump back on. The system should now be providing cool water via the heat exchanger.