Dependent Airflow Control - Price FFU series Installation And Service Manual

FAN FILTER UNIT
INSTALLATION & SERVICE INSTRUCTIONS
Ducted Supply – Pressure Independent and Dependent Airflow Control
NOTE: If there is a pressure independent device upstream of the FFU then PSC or ECM with constant torque motors should be
used.
If FFU is not already installed:
STEP 1: Set FFU with filter installed, on benchtop and set to desired airflow using appropriate speed controller flow equations
(Page 34).
STEP 2: Confirm airflow using a flow hood and adjust speed controller as required.
STEP 3: Ensure each supply air duct is balanced to scheduled airflow and matches FFU set point.
STEP 4: Turn off primary air source.
STEP 5: Install FFU into ceiling, connect ductwork.
STEP 6: Turn all FFUs on – ensure all FFUs are running before proceeding to next step.
STEP 7: Turn on primary air source.
STEP 8: Measure airflow using flow hood and compare against scheduled flow. FFU inlet static should be verified to be neutral.
See table below if proper operation is not achieved.
FIGURE 43: DUCTED UNIT: CONSTANT TORQUE FFU WITH
UPSTREAM PRESSURE INDEPENDENT TERMINAL.
FIGURE 44: DUCTED UNIT: CONSTANT FLOW FFU WITH
UPSTREAM PRESSURE DEPENDENT TERMINAL AND
MANUAL DAMPER.
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