Price FFU series Installation And Service Manual page 46

FAN FILTER UNIT
INSTALLATION & SERVICE INSTRUCTIONS
If the FFU is ducted and removing the duct is not possible, follow the below instructions for balancing:
STEP 1: Turn off primary air source.
STEP 2: Install an air pressure measurement device (i.e. Pitot tube) in the duct prior to the FFU inlet.
STEP 3: Power up FFU and set speed controller to calculated set-point using flow equations (Page 34).
STEP 4: Power up the airflow control device. (Ductwork should have been previously balanced)
STEP 5: Read the inlet pressure.
STEP 6: Measure airflow using flow hood.
STEP 7: Using the table below, adjust FFU controller, or upstream airflow device as required
Repeat steps 4-6 until desired airflow and inlet pressure (0.0 ± 0.05" w.g.) is achieved..
FFU Airflow
Above Set point
Above Set point
Above Set point
Below Set point
Below Set point
Below Set point
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FAN FILTER UNIT - Manual | priceindustries.com
FFU Inlet Static (measured)
Above desired pressure
Below desired pressure
At desired pressure
At desired pressure
Below desired pressure
Above desired pressure
Action
Decrease airflow on airflow control device
Decrease FFU control setting
Decrease Both FFU and airflow control device
Increase Both FFU and airflow control device
Increase airflow on airflow control device
Increase FFU control setting