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If the dampers are equipped with an automatic electric actuator,
the actuator electric motor controller will include a 200-volt AC
space heater in accordance with the SPX Cooling specification.
The space heater is to be energized at all times whether actuator
motor is operating or not. The purpose of the energized space
heater is to prevent moisture inside the unit from corroding the
internal components. Failure to wire and energize the space heater
will void the warranty if the actuator fails due to internal corrosion.
Automatic Electric Actuator must be stored in a dry environment
until installed. If a unit is going to sit idle prior to startup, the actua-
tor must be removed from the damper and stored appropriately.
Dry Operation:
Also refer to the Freezing Weather Operation and Protection Against
Coil Freezing sections.
Models equipped with a finned coil(s) are designed to operate dry without
recirculating water during colder weather as heat load and ambient condi-
tions permit.
If dry operation is intended and the recirculating water is at risk of freezing,
the recirculating pump should be turned off, and the water in the collection
basin, pump and make-up supply piping should be drained.
Care must be exercised when cycling the recirculating water pump(s)— fre-
quent wet/dry cycles may lead to premature scaling of the coil surface.
operation
Note
Note
