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

SCW Series Central Chilling Stations Page 21 of 77
!
DANGER
Improper electrical connections
will damage the unit and cause
serious operator injury or death!
Compressor damage will occur if
compressors are run backwards.
Bring properly sized power leads and ground from a fused
disconnect (installed by your electrician) to the unit. Provide
external overcurrent protection to the unit, using circuit breakers or
fuses. If you use fuses, make sure that they are dual-element time-
delay fuses, sized according to your electrical code. Make sure that
all electrical connections are tight.
Important!
1. Electrical connections must comply with all applicable electrical codes.
2. The chiller must be grounded in accordance with NEC Article 250.
3. Voltage must be within plus or minus ten percent (
±10%) of the nameplate
rating.
4. Make sure your installer provides external protection.
Check Compressor Rotation Before Starting Unit!
1. Connect a phase monitor and phase incoming power ABC.
2. Connect a refrigerant gauge to the suction service valve. Fully front seat
the service valve and open one full turn.
3. Bump start the compressor by switching off then on quickly 0.5 to 1
second. If the rotation is correct, the suction pressure will drop
immediately. A rise in pressure will indicate the wrong rotation. If this
occurs, change over two electrical phases of the incoming power supply
(do not change phase at the compressor starter).
Check the electrical wiring schematic
provided in your Customer Information packet
for additional information.