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 a ducted return or return mixing box is used, a PSC, ECM Constant Torque or ECM Constant Flow (preferred) can be used.
STEP 1: If return mixing box is used, turn primary air off. If ducted return, proceed directly to Step 2.
STEP 2: Set FFU to desired flow using appropriate speed controller flow equations (Page 34).
STEP 3: Confirm airflow using flow hood and adjust speed controller as required.
STEP 4: Power up the primary airflow control device. (Ductwork should have been previously balanced).
STEP 5: Measure airflow using flow hood and compare against scheduled flow. Adjust speed controller as necessary to achieve
design airflow.
FIGURE 45: FFU WITH DUCTED RETURN.
FIGURE 46: FFU WITH RETURN MIXING BOX.
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