A suspended horizontal air handling unit is connected to supply and return air ductwork using flexible connections and rubber-in-shear vibration isolation hangers. The outdoor air intake features a mesh screen, a motorized damper interlocked to open when the fan is energized and fail closed, and a bell mouth spin-in fitting. The unit houses a filter section, an electric heater, and a cleanout with a pipe plug. A zero-point-seven-five-inch condensate drain line drops into a dedicated trap with a vent. Refrigerant lines route from the unit to their associated condensing unit, and balancing dampers with locking quadrants regulate airflow.
MESH SCREEN MOTORIZED DAMPER. INTERLOCK WITH FAN SUCH THAT THE DAMPER OPENS WHEN THE FAN IS ENERGIZED. THE DAMPER SHALL FAIL IN THE CLOSED POSITION. BELL MOUTH SPIN-IN FITTING OUTDOOR AIR DUCT FILTER SECTION BY UNIT MANUFACTURER FLEXIBLE CONNECTION (TYP) CIRCUIT BREAKER DISCONNECTING MEANS BALANCING DAMPER WITH LOCKING QUADRANT ROUTE REFRIGERANT LINES TO THEIR ASSOCIATED CONDENSING UNIT LINED RETURN AIR PLENUM SAME SIZE AS UNIT INLET RUBBER-IN-SHEAR ISOLATION HANGER (TYPICAL) SUPPLY AIR DUCT 0.75" CONDENSATE DRAIN BELL MOUTH SPIN-IN FITTING WITH VOLUME DAMPER AND LOCKING QUADRANT PIPE PLUG CLEAN OUT VENT ELECTRIC HEATER TRAP RL RS MD
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