Sterling SCW Series installation manual Evaporator Maintenance, Pump Motor Seal, Makeup Valve

9-3 Evaporator Maintenance

The evaporator(s) may be accessed for back-flushing by removal of the 2” plug (approx. 51 mm) in the return control nipple and the flow switch in the supply control nipple. If the suggested piping recommendations have been followed, one circuit of a multiple circuit chiller may be back-flushed without shutting down the entire system. Check Y-strainer for any clogging.

9-4 Pump Motor Seal

Pump seals require water for lubrication, so the pump(s) must never be run dry. Always fill the tank before attempting to operate the pump(s). Seal failures usually follow a period of dry operation of the pump.

9-5 Makeup Valve

Periodically inspect the water makeup valve assembly for proper operation. If the valve no longer shuts off completely or reliably, replace it. The plastic ball float should be buoyant for proper operation.

9-6 Recommended Pump Tank Spare Parts

Part no.	Part description	Quantity
A0550190	Pressure gauge	1 per pump
A0102396	Float valve, 1” (approx. 25 mm)	1 per tank
A0069538	Plastic ball float, 6” (approx. 152 mm)
A0102394	Float rod, 10” (25 cm)
- Call Sterling Parts -	Pump seal and casing gasket	1 per pump

Check your Customer Information Packet for a complete list of spare parts and part numbers for your SCW Series chilling station.

SCW Series Central Chilling Stations Page 65 of 77