Get HVAC Controls. Operation & Maintenance PDF

By W. Gupton Jr.

ISBN-10: 0521830168

ISBN-13: 9780521830164

Now in it really is newly up to date 3rd version, this guide was once written to function an entire and concise reference for these engaged within the operation and upkeep of computerized keep an eye on platforms serving development heating, ventilating and air con structures. the entire variety of themes pertinent to the powerful operation of all kinds of HVAC regulate platforms presently in use this day are explored, together with equipment-to-control interactions, regulate method set-up and capabilities, neighborhood loop to construction automation procedure interfaces, functionality prediction and overview, operational parameters, and upkeep and checking out. The 3rd variation contains a new bankruptcy masking the installations and strategies required to replace an present pneumatic regulate approach to a hybrid pneumatic and direct electronic procedure through including DDC sign sensing and keep an eye on algorithms to latest pneumatic actuators on dampers and valves.

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Extra resources for HVAC Controls. Operation & Maintenance

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All rights reserved. HVAC CONTROLS—OPERATION & MAINTENANCE Figure 2-5. Control of Preheat Coil, Open Loop. , from 1987 HVAC Systems and Applications Handbook. ” and bypassed airstreams, to avoid stratification of cold and hot air. The coil valve is interlocked with the fan system and the dampers are controlled from a temperature controller. Psychrometrics Psychrometrics is the science of moist air, such as is conditioned in an HVAC system. ” The psychrometrics of preheat coils operation involves the heating only process and the air mixing process.

Discharge damper control. Variable inlet vane control. Fan speed control. Of these methods, the first relies on inherent fan performance, the second controls air direction without reduction of volume, and the other three modify fan performance. Riding the Fan Curve Fans in HVAC systems are usually centrifugal blowers, and may have forward-curved, backward-curved, or airfoil-bladed wheels. Each wheel type has different pressure-volume-horsepower relationships but the performance of all types can be predicted using the “fan affinity laws” which relate the air volume handled, the static pressure developed, and the horsepower required to the fan speed.

The set-up of outside temperature control points for changeover or for operation of circulators is done by logical selection processes to allow temperature differences adequate to prevent freezing. TERMINAL DEVICES Types of Terminal Devices Terminal devices are those devices used to provide the final control element for the conditioned space. Types of terminal devices are: • • • • Zoning dampers. Constant volume boxes. Variable volume boxes. Powered induction units or powered mixing boxes. ©2002 by The Fairmont Press.

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HVAC Controls. Operation & Maintenance by W. Gupton Jr.


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