Manual
2100-458F
Page
11 of 18
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 and CRVP-5L, 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
CRV 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
