By Guy W. Gupton
Now in it really is newly up-to-date 3rd version, this guide used to be 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 total diversity of issues pertinent to the potent operation of all kinds of HVAC keep an eye on platforms at present in use this present day are explored, together with equipment-to-control interactions, keep watch over method set-up and capabilities, neighborhood loop to development automation procedure interfaces, functionality prediction and review, operational parameters, and upkeep and trying out. The 3rd variation features a new bankruptcy protecting the installations and approaches required to replace an latest pneumatic keep watch over process to a hybrid pneumatic and direct electronic procedure through including DDC sign sensing and regulate algorithms to present pneumatic actuators on dampers and valves.
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Additional info for HVAC Controls: Operation and Maintenance (3rd Edition)
Constant volume, dual-duct (CVDD) terminal boxes are served from cold-air and hot-air ducts which have temperature controlled as described above under cold-deck and hot-deck temperature control. Constant volume regulators are mechanical devices built into the box. Temperature control functions vary between terminal box manufacturers. The simplest method is to control cold-air volume from space temperature with variable volume valve at box inlet and to control hotair volume by action of the constant volume regulator.
The larger the percentage of outside air, the closer the mixed air temperature will be to the outside air temperature. Below the changeover point to “economizer cycle,” where the temperature controller is calling for a supply air temperature near the outside air temperature, the mixed air section must handle as close to 100% outside air as damper leakage will permit. With damper leakage commonly in the 10% range, it becomes difficult to maintain the desired HVAC EQUIPMENT-TO-CONTROL INTERACTIONS 39 Figure 2-10.
When the limit thermostat overcalls the time controls, the outside air dampers remain closed, the interlocked exhaust fans remain off, and the unit cooling and heating coil controls function as on occupied cycle until the limit thermostat setpoint is satisfied, which generally requires a change of from 3°F to 5°F. Most programmable electronic thermostats include space temperature limit control features. Set-Up and Checkout Techniques The control of cooling and heating coils is the basic temperature control process.
HVAC Controls: Operation and Maintenance (3rd Edition) by Guy W. Gupton