By Roger W. Haines
Control structures for Heating, Ventilating and air con, 6th Edition is whole and covers either regulate platforms and glossy regulate expertise. the fabric is gifted with no bias and with out prejudice towards specific or software program. Readers with an engineering measure should be reminded of the psychrometric techniques linked to heating and air-con as they research of a number of the controls schemes utilized in the diversity of heating and air con method forms they're going to encountered within the box. upkeep technicians also will locate the publication helpful since it describes a variety of regulate and keep an eye on innovations that have been utilized in the earlier and are regularly occurring in such a lot latest heating and air con systems.
Designers of latest structures will locate the basics defined during this publication to be an invaluable start line, and they'll additionally reap the benefits of descriptions of recent electronic applied sciences and effort administration platforms. This expertise is located in glossy construction HVAC procedure designs.
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In comparing compressor ratings it should be noted that displacement and capacity are different. Capacity will be from 60% to 80% of displacement. If the system is very large, it is preferable to have two compressors to improve reliability. Generally air is compressed to 60 to 80 psig, and passes Pneumatic Control Devices 39 " Figure 2-27(A) 'JYpical pneumatic control panel, door closed. Note temperature and static pressure indication, minimum outside air switch and selector switch. (Courtesy lohnson Controls.
This starts the motor and causes it to actuate a valve or a damper to offset the variation from set point. The motor operation also moves the feedback potentiometer wiper, which offsets the effect of the controller. When balance is restored (with the motor in a new position), the relay coil currents are again equal, the relay arm is centered, and the motor stops (Figure 3-18(C». The limit switches are needed to stop the motor at the end of the stroke if the sensed conditions are beyond the throttling range of the controller.
These motors may be provided with cam-operated auxiliary contacts that open and/or close at any desired point in the rotation. 3 Modulating Motors Modulating motors are used for proportional and floating controls. They must, therefore, be reversible and capable of stopping and holding at any point in the cycle. The motors used in these devices will be either reversible two-phase induction motors or reversible shaded-pole motors. 1 Reversible Induction Motors Schematically, the two-phase induction motor (Figure 3-12) has two field windings directly connected at one end (C) and connected at the other by a capacitor.
Control Systems for Heating, Ventilating, and Air Conditioning by Roger W. Haines