By W. Gupton Jr.
This instruction manual serves as an entire and concise reference for these engaged within the operation and upkeep of computerized regulate structures serving development heating, ventilating and air-con structures. the entire variety of issues pertinent to the powerful 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 an eye on approach set-up and capabilities, neighborhood loop to construction automation approach interfaces, functionality prediction and review, operational parameters, and upkeep and trying out. This 3rd variation features a new bankruptcy masking the installations and approaches required to replace an latest pneumatic keep watch over process to a hybrid pneumatic and direct electronic process by means of including DDC sign sensing and keep an eye on algorithms to current pneumatic actuators on dampers and valves.
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Extra resources for HVAC Controls - Operation and Maintenance
Where relocation of control devices is not practicable, take action to minimize the effects of vibration, such as adding vibration absorbers and weighted bases to control instruments. Loosening of Damper Linkage Fastenings Damper linkages on multi-zone unit mixing dampers are subjected to vibration due to their location in turbulent air within the unit close to the fan. Connectors in damper linkages should be made to withstand vibration, using sharp-pointed set screws, lock washers, and locktite fasteners.
Electric and electronic control system connections may be checked for tightness by using a volt-ohm-ampere multimeter to measure the resistance across the joint. A measurable resistance across a joint is considered excessive and must be corrected. Pneumatic control system connections may be given a rough check for tightness by listening for the hiss of an air leak. Suspected leaking joints may be checked using the soap bubble test. Where major air leaks are suspected in pneumatic controls system air mains due to loss of air pressure, a sectionalizing exercise must be performed.
Testing of minimum positioning relays and other multi-positioning devices is a necessary part of this work. Servicing Air Filters Air filters in a pneumatic system include air intake filters on compressor, particulate filters in the main air supply dual element unit, and "finger" filters at individual control components. The required frequency of change should be based on exposure to contaminants and pressure drop. The possibility of media blowout due to excess pressure drop is very good reason for changing filters.