ENVIRO-TEC
19
FORM ET115.24-NOM12 (718)
FAN MOTOR CONTROL
Unit control with discrete components consists of a
transformer, fan enable relay and terminal strip for
customer and peripheral connections. The transformer
will vary in primary voltage depending on each unit’s
ordered options. The transformer will always have a
24VAC secondary voltage. An optional Hand-Off-Auto
switch may be used to provide manual and automatic
control of the fan.
A PWM board will provide the motor control signal to
the motor. Refer to EC Motor Solo, Select and Sync
PWM IOM, All Products for more information about
the PWM and EC motors.
Peripheral devices (e.g., thermostat controllers, electric
heat relays, water valve actuators, condensate drain pan
oat switches, air dampers) are connected by either the
OEM or by the installer at the terminal strip.
INSTALLATION
MOUNTING
Important: Do not overtighten the screws.
Overtightening may strip the threads and will void
the warranty.
Using #8 screws, install the components using the
provided mounting holes for each component.
Risk of Electric Shock
Disconnect or isolate all power supplies
before making electrical connections.
More than one disconnection or
isolation may be required to completely
de-energize equipment. Contact with
components carrying hazardous
voltage can cause electric shock and
may result in severe personal injury
or death.
WIRING
Install the wiring so it does not cause a hazard, and is
protected against electrical and mechanical damage.
Risk of electric shock
Ground the transformer according
to local, national, and regional
regulations. Failure to ground the
transformer may result in electric
shock and severe personal injury or
death.
The COM terminal on the secondary side of the
transformer must be grounded per NEC requirements.
SECTION FOUR - DISCRETE COMPONENTS
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