What are the considerations for the illustrated system regarding safety of the mechanical components? What are the considerations for the illustrated system regarding energy use? What is a typical application of the type of system illustrated? Where and what safeties should be installed? Where is the mixed air plenum and what are the mixed air’s three purposes? How would you manually operate this fan system to address ventilation, comfort and energy use requirements under these different conditions? (1) At unoccupied times when the outside air (OSA) temperature is below 35°F? (If the fan is the only source of heating? If adequate perimeter heating also exists? (2) At occupied times when the OSA temperature is below 35°F?(3) At unoccupied times when the OSA temperature is above 35°F? (4) At occupied times when the OSA temperature is above 35°F? 7.50 MANUAL ADJUSTMENT OF MIXED AIR FAN RETURN FAN SUPPLY FAN COOLING COIL HEATING COIL DM1 DM2 DM3 PRV1 OUTSIDE AIR EXHAUST AIR NC NC NO RETURN AIR SUPPLY AIR MIXED AIR PRV2 PRV3 MAIN AIR V1 V2 CWR CWS HWR HWS NO NO C NC NC C
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