REYMSA COOLING TOWERS, INC.
www.reymsa.com
The
All-Fiberglass
Cooling Towers
53
Installation
A.11.3.1 PROCEDURE TO WIRE THE FAN MOTOR
REYMSA suggest that after extended shut down, the model should be checked with insulations tester prior
to restarting motor.
1. To gain access to the motor, remove the fan guard on top of the fan duct.
2. Remove the cover to the motor junction box.
3. Wire the motor following the wiring diagram in the fan motor nameplate. A piece of flexible conduit
is installed to facilitate wiring. Ensure that the motor is properly grounded.
4. Rotate the fan by hand to verify that it freely rotates. The fan should not touch the side of the Tower
and there should be no noises coming from the motor.
5. Place the junction box cover on the motor and fan guard on the fan duct. Select motor starter and
disconnecting device for the motor: size, voltage and FLA; in accordance with federal, state and local
electrical code. The three-phase motor control circuit must contain:
▪ A motor controller (motor starter) with over-current protection.
▪ A motor disconnecting device must be installed with lockable means to disconnect the main power
source.
▪ A ground fault protection for the motor.
As optional equipment, REYMSA recommends a vibration cut-off switch to shutdown the electrical motor in
case of excessive vibrations caused by malfunctioning of the fan (see section “A.10.2 VIBRATION SWITCH”
for installation guidelines).
Do not proceed without disconnecting all electrical power, tag and lock in the off position
for the motor and pump.
Use an OSHA approved ladder and follow manufacturer’s instructions for proper use.
Failure to do so may result in personal injury or property damage.
CAUTION
If fan motors are cycling (ON-OFF) at full voltage controlled by temperature signal
or heat load demand.
Rapid ON-OFF cycles can damage the fan.
WARRANTY VOID
FAN MOTOR
Use a soft-starter or VFD as motor starter.
When using a Variable Frequency Drive (VFD), is not uncommon to exhibit resonant
frequencies that result in vibrations, damaging all components of the system. To prevent
premature failure, the VFD must be programed to “skip” resonant frequencies that cause
unusual rumbling or grinding noise.
WARNING
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