Sterlco S Series Central Chilling Stations - Manual (Page 21)

SSC Series Central Chilling Stations Page 21 of 86
Note:
• Never switch contactor leads or motor leads for reversing
rotation.
• Do not use contactor or motor leads for phase matching.
• Compressor noise from reverse rotation is noticeable. Do not
run in this mode for more than ten (10) seconds. The
compressor shuts off if it is run longer in this mode.
• Reverse rotation can cause suction and discharge pressures to
be approximately equal; amp draws will be lower than normal.
• 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 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 SSC Series chilling stations have two chilled water connections
per unit, and on water-cooled models, one more set of water
connections for condenser water: