SPX Cooling Technologies Fluid Cooler Marley MC - Manual (Page 8)

8
6. Attach process fluid supply and return piping to the coil. Standard field
piping connection is an NPT male connection at the coil. A flanged
connection requires a gasket between the fluid cooler and the fluid
supply piping.
For welded connections protect adjacent areas from excessive heat
and sparks or damage may occur.
7. Wire motor(s) and recirculation pump(s) in accordance with wiring
diagram.
For maintenance/safety purposes, SPX Cooling Technologies recom-
mends a lockout type disconnect switch for all mechanical equipment.
In addition to a disconnect switch, the motor should be wired to main
power supply through short circuit protection, and a magnetic starter
with overload protection.
Motor Wiring
Wire motor leads as shown on the motor nameplate matching the supply
voltage. Do not deviate from the motor nameplate wiring.
Either of following symbols may be shown on the motor nameplate –
Δ, Δ Δ,
Y , or YY . These symbols represent how the motor is constructed on
the inside and in no way have anything to do with a Delta or Wye electrical
distribution system serving the motor.
When using a starter:
• Set motor overload protection to 110% of motor nameplate amps.
This setting allows the fan motor to operate during cooler weather.
During cooler weather it is common for the motor to draw 6 to
10% higher than nameplate amps. High amps are common during
tower commissioning when the tower is dry and the ambient air
temperature is cool.
• Do not start the motor more than six times per hour. Short cycling
the tower will cause fuses, breakers or O.L.s to operate and will
decrease motor life.
Caution
Warning
Installation