1 - The following measurements must be made with air
2 -
Blower performance data is based on static pressure
Note - Static pressure readings can vary if not taken
where shown.
3 -
unit CFM. Use air resistance table when installing
units with any of the options or accessories listed
clockwise to increase CFM. Turn counterclockwise
minimum and maximum number of pulley turns as
shown in table 5.
5 - ZGB074S4T Unit Only -
TABLE 5
MINIMUM AND MAXIMUM PULLEY ADJUSTMENT
Belt Min. Turns Open Max Turns Open
A Section No Minimum 5
LOCATION OF STATIC PRESSURE READINGS
SUPPLY AIR
READING
LOCATION
SUPPLY
TURN
INSTALLATIONS WITH DUCTWORK
SUPPLY
TURN
INSTALLATIONS WITH CEILING DIFFUSERS
MAIN
DUCT RUN
FIRST BRANCH
OFF OF MAIN RUN
DIFFUSER
ROOFTOP UNIT
ROOFTOP UNIT
SUPPLY AIR
READING
LOCATION
RETURN AIR
READING LOCATION
RETURN AIR
READING
LOCATION
FIGURE 6
TO INCREASE BELT TENSION
1-Loosen four bolts securing motor base to mounting frame.
2-Slide the motor downward to tighten the belt.
3-Tighten four bolts on motor base.
TO INCREASE CFM
LOOSEN ALLEN SCREW &
TO DECREASE CFM
TURN PULLEY
COUNTERCLOCKWISE
PULLEY
MOTOR
SIDE VIEW
ALLEN
SCREW
LOOSEN FOUR BOLTS
AND SLIDE BLOWER
MOTOR DOWNWARD
TO TIGHTEN BELT
FIGURE 7
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