Screw Compressor Central Chiller
Chapter 3: Installation
17
Note:
x
Never switch contactor leads or motor leads for reversing rotation.
x
Do not use contactor or motor leads for phase matching.
x
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.
x
If you discover that phasing 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 next section.
3-4 Setup Procedures
This section provides the procedures necessary for configuring your Screw Compressor
Central Chiller.
Configuration of your chiller includes making process water connections, tank piping
connections, water-cooled condenser connections, and connecting the remote air-cooled
condenser. We recommend that you carry out these procedures in the order given here.
Note:
Before carrying out these procedures, install all equipment as described in
this section.
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. Our Contracting Department can design and install a piping system
tailored to your process.
x
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.
x
Run mains full size in order to reduce pressure drop in the system and provide
maximum pressures at the ends of the mains.
