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Air Duct Controls
OAT OAP Outside Air Damper MAT Fiher FRZ BFS/S SFFB FORH 9 Ductwork Return Air Damper MAP Damper / Mixing / Filtering The outside air connection to the mixing box or plenum of the AHU is shown on the top of the unit, as opposed The room thermostat controls the mixing ratio of hot and cold air for its load. The CAV regulator keeps the total flow steady. Single Duct Variable Volume: Referring to Fig. 13140, thermostat T1 gradually positions the regulator through motor In this control loop philosophy, FD fan vanes are seen as final control elements and are modulated to control the hot air duct pressure. FD fans suck air from the atmosphere, and then the air passes through air heaters to raise the outlet “Riding the fan
curve”.with a forward curved wheel is the lowest first cost control method. Return Air Dumping When system duct pressure is controlled by return air dumping, as the pressure sensed by the duct static pressure controller Covering both tropical and temperate climates, this is the ideal book for those learning about the basic principles of air conditioning, seeking to understand the latest technological developments, or maintaining a successful HVAC practice On the other hand, the smoke detector would be better suited to detect smoke in the actual space served by the air handler if the detector were installed in the return air duct. Yet if the overall air handling unit has no exhaust capabilities, then its 2. l; AIRCONDITIONING
CONTROLS.An example of the control system for an airconditioning system is described in required, the recirculation damper starts to close and at the same time the inlet and extract duct dampers are opened.Obviously some type of control is required to maintain the desired humidity in the building. There are several types of humidity controls. The most common is the type installed in the furnace return air duct before the air passes through A space thermostat controls only the warm air inlet and a static pressure regulator controls the flow through the cold air inlet Thus, insufficient pressure in the warm air duct can produce cooling of the conditioned space when the thermostat is If the primary air fan is off during unoccupied
hours,.the dual temperature thermostat controls the fan and reheat coil valve to maintain its For dualduct system configurations, refer to Air Handling System Control Applications 771130.
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