By W. Gupton Jr.
Now in it really is newly up-to-date 3rd variation, this guide used to be written to function a whole and concise reference for these engaged within the operation and upkeep of automated regulate structures serving development heating, ventilating and air con platforms. the entire variety of issues pertinent to the potent operation of all kinds of HVAC keep watch over structures at the moment in use this present day are explored, together with equipment-to-control interactions, keep an eye on approach set-up and features, neighborhood loop to development automation method interfaces, functionality prediction and evaluation, operational parameters, and upkeep and trying out. The 3rd variation encompasses a new bankruptcy masking the installations and systems required to replace an present pneumatic keep an eye on approach to a hybrid pneumatic and direct electronic process through including DDC sign sensing and keep an eye on algorithms to current pneumatic actuators on dampers and valves.
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Additional info for HVAC Controls - Operation & Maintenance
Firestats are wired to interrupt the holding coil circuit on the magnetic starter which serves the primary fan to shut down the primary unit. Firestats must be of the manual reset type to ensure that a system shutdown from a high temperature condition is investigated. Firestats mounted in return air streams are generally set from 125°F to 135°F. Firestats in supply ducts are often selected with setpoints similar to fire dampers. Setpoints will be based on the normal temperature to be transmitted in the duct on heating cycle and are to be set no more than 50°F higher than that temperature.
The lowest power requirements are obtained with airfoil-bladed and backward curved fans. As the static pressure controller senses an increase in duct static pressure, the controller generates a signal to position the variable inlet vanes to close partially, which causes the air entering the round fan wheel inlet to start a spiral movement. The spiral movement directs the incoming air in a direction against the direction of rotation of the fan wheel and causes the fan to perform on a different characteristic curve from the fullopen damper position.
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. When the coldair volume required to meet the cooling loads is less than the constant volume setting, the difference between the required cold-air volume and the constant volume setting will be made up by hot air.