Manual 2100-458C
Page
10 of 17
BLADE ADJUSTMENT FOR DESIRED
VENTILATOR AIR
The amount of ventilation air supplied by the
commercial room ventilator is dependent on five (5)
factors.
1. Return air duct static pressure drop.
2. Supply air duct static pressure drop.
3. Indoor blower motor speed.
4. Damper blade open position setting.
5. Tightness or looseness of building envelope.
Determine on what speed the evaporator motor is
running.
Refer to the graphs on the following pages to determine
the blade setting necessary to achieve the ventilation air
required. With the blower energized, use the
thumbwheel on the CRVS-5, adjust blade to desired
blade position. On the CRVP-5, move the blade stops
on the sides of the CRVP to the desired blade position -
making sure the stops are parallel side to side.
FIGURE 6
CRVS POSITION ADJUSTMENT
CLASSROOOM VENTILATOR MOTOR
MIS-2188
NOTE: POSITION ADJUSTMENT
THUMBWHEEL IS LOCATED
ON BACK OF MOTOR ABOVE
THE WIRING TERMINALS
ACTUATOR
MOTOR
BACK OF
ADJUSTMENT
THUMBWHEEL
ROTATE UP TO OPEN
DOWN TO CLOSE
POSITION WITH THUMBWHEEL
ADJUST FULL OPEN
POSITION
ADJUSTMENT
THUMBWHEEL
