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Page 22 of 77 SCW Series Central Chilling Stations
Note:
• Never switch contactor leads or motor leads for reversing
rotation.
• Do not use contactor or motor leads for phase matching.
• Compressor damage will occur if the compressor is run in
reverse. The compressor motor protector checks for correct
phasing and will not allow it to start in reverse.
• If you discover that compressor rotation is reversed, correct it
by switching any two main power leads into the disconnect
switch or distribution block on the unit.
Check your work and proceed to the following Piping Considerations section.
3-3 Piping Considerations
Piping systems vary with process application and pump tank
configuration. Typical system configuration drawings are provided
in this manual; the details may or may not apply to your
application. Piping systems must be designed by a person
knowledgeable in piping system design and configuration.
Sterling’s Contracting Department can design and install a piping
system tailored to your process.
• All water piping returning to the pump tank must be equipped
with an inverted trap with a vacuum breaker at the high point
of the system to prevent mains from siphoning into the pump
tank.
• Run mains full size in order to reduce pressure drop in the
system and provide maximum pressures at the ends of the
mains.
3-4 Making Process Water Connections
All Models
All SCW Series chilling stations have two chilled water
connections per unit, and on water-cooled models, one more set of
water connections for condenser water:
To Process
The chilled water supply outlet leading to the process being
controlled.