Motor Wiring - SPX Cooling Technologies MH Fluid Cooler User Manual

Warning
Note
8
installation
Threaded connection: The coil piping connections are fitted with
male threads of a specified thread type — most commonly NPT or BSP,
depending on location of installation.
Copper Soldered connection: The piping connections are pipe stubs
for field soldering.
Flanged connection: The coil piping connections are designed for flat-
face flange fittings conforming to 125# ANSI B16.1 specifications and
are field installed (by others). Flange fittings are grooved connection for
steel coils and solder connection for copper coils. Full faced gaskets and
appropriately sized bolts (by others) must be used for proper function.
7. Wire motor(s) and recirculation pump(s) in accordance with wiring dia-
gram.
For maintenance/safety purposes, SPX recommends 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 ,
, or . These symbols represent how the motor is constructed on
Y YY
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 fluid
cooler commissioning when the fluid cooler is dry and the ambient
air temperature is cool.
Do not start the motor more than four to five times per hour. Short
cycling the fluid cooler will cause fuses, breakers or OLs to oper-
ate and will decrease motor life.