Manual 2100-764
Page
4 of 8
MIS-4360 A
CRV MOUNTING HOLES
USE POTENTIOMETERS ON
CRV BOARD TO ADJUST
THE BLADE POSITION IN
EACH MODE OF OPERATION
Blade Adjustment for Desired
Ventilator Air
NOTE:
QCRV-4 is factory adjusted to the "B" blade
setting.
The amount of ventilation air supplied by the
commercial room ventilator is dependent on five (5)
factors:
1. Return air pressure drop.
2. Supply air duct static pressure drop.
3. Indoor blower motor speed.
4. Damper blade open position setting for each mode
of operation.
5. Tightness or looseness of building envelope.
To determine the amount of fresh air that will be
supplied to the structure:
1. Determine the pressure drop of the supply air duct
(see Table 1). For duct-free applications with return
air filter grille and supply grille, use the Duct-Free
column.
2. Determine the ventilation CFM required.
3. Find the ventilation CFM required in Table 1. Read
left to determine required blade position for the
desired ventilation CFM.
FIGURE 2
CRV Installation and Adjustment
