Greenheck Fan Make-Up Air Unit VSU - Manual (Page 9)

9 Model VSU Make-Up Air
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6. Set-up Optional Components
Adjust the settings on the optional components. See
the Control Center Layout in the Reference section for
location of optional components.
• Heating Inlet Air Sensor
Typical setting: 60-70ºF
NOTE
The most accurate way to measure the air volume is
by using a pitot traverse method downstream of the
blower. Other methods can be used, but should be
proven and accurate.
IMPORTANT
Changing the air volume can significantly increase
the motor’s amps. If the air volume is changed,
the motor’s amps must be checked to prevent
overloading the motor.
NOTE
To ensure accuracy, the dampers are to be open
when measuring the air volume.
5. Air Volume Measurement & Check
Measure the unit’s air volume (cfm) and compare it with
it’s rated air volume. If the measured air volume is off,
adjust the fan’s RPM by changing/adjusting the drive.