W. Gupton Jr.'s HVAC Controls - Operation & Maintenance PDF

By W. Gupton Jr.

This ebook is one in a sequence addressing development structures design,operation, and upkeep. the cloth offered during this booklet can be utilized for workplace reference, for formal in-house education courses, and for casual self study.The fabric isn't really meant for use instead for brands’ directions for particular gear. This publication is written to supply an entire and concise referencevolume for folks engaged within the operation and upkeep of automated keep an eye on platforms serving construction heating, ventilating, and air-con structures, together with refrigerating machines, and interface to construction automation structures (BAS) structures. power administration and keep watch over method (EMCS) are of such varied forms and preparations that it isn't attainable to hide them during this ebook.

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Cold-Deck and Hot-Deck Temperature Control In parallel path systems, where one air handling unit is serving several zones, a separate temperature controller for each deck maintains the desired deck supply air temperature. The setpoint may be set or reset by cold-deck discriminator or by hot-deck outside air reset. Temperatures from chilled water coil supplied cold-decks on systems which do not operate 24 hours per day may be uncontrolled with unregulated coil water flow. Multi-zone mixing dampers use two damper blades mounted on a common axle with the position of the cold-deck damper at 90° to the hot-deck damper.

Pumping systems control. Boiler and chiller plant control. 23 24 HVAC CONTROLS—OPERATION & MAINTENANCE AIR MOVING SYSTEM CONTROL The basic control functions for air moving systems include daily start-stop, emergency fan shutdown, smoke damper operation, smoke removal, and outside air control. These control functions are documented on electrical wiring diagrams. Daily Start-Stop The on-off or start-stop sequence of central air handling unit fan or fans may be controlled manually from a starting switch or hand-wound interval timer, automatically through a program timing device, or automatically from a relay energized from a direct digital control (DDC) system, an energy management system (EMS), or an energy management and control system (EMCS).

This condition causes some variation of airflow among zones as the damper positions are changed and the fan shifts its operating point on the fan curve, but the resulting variation in airflow does not cause a problem. Heating Coil Discharge Temperature Control The air temperature leaving a heating coil can be controlled by use of either open loop or closed loop control strategies. Discharge Air Limit Control. This is an open loop strategy for a fixed discharge temperature value. The discharge temperature controller varies the flow of heating media, steam or heated water, through the coils so that discharge air is conditioned to the desired temperature.

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