Operation and Maint.Manual VUD VUF VDF HCD SeriesRev6.doc
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The electrical circuit in the unit ventilator is highly dependent on the controller and
sequence that is being utilized. The unit can be supplied with a 115V, 208V, 277V or 460V
power. Each unit comes standard with an unfused disconnect. A copy of the electrical
schematic can be found folded in a pouch inside of the unit ventilator.
The outdoor air dampers and return air dampers are mechanically linked. As the outdoor
air dampers open, the return air dampers close. A spring return damper actuator is
connected to a linkage that extends to both sets of dampers. The damper actuator
manufacturer can vary. Please refer to the wiring schematic for the damper actuator model
type.
Internal powered exhaust is an optional feature that is provided with our vertical series unit
ventilators. This feature comes with a fan and damper module that is mounted into the
return air section of the unit. Control should be setup by the temperature controls
contractor to operate as an on/off device as the outdoor air damper opens and closes.
Typically, 1” disposable filters are provided in the unit with an extra set shipped loose for
when the unit is ready for start-up. Please refer to the “shop drawings” for specific details
on filter construction and thickness. Below are sizes and quantity per unit for the different
model types.
Model Number Filter Size Quantity Per Unit
VUD, VDF, VUF, HCD 1200 12” x 20” nominal 2
VUD, HCD 1600 12” x 24” nominal 2
VUD 2000, VUF 1500 16” x 21” nominal 2
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