Download Control Systems for Heating, Ventilating, and Air by Roger W. Haines PDF

By Roger W. Haines

Control platforms for Heating, Ventilating and air con, 6th Edition is entire and covers either regulate structures and smooth keep an eye on know-how. the cloth is gifted with no bias and with out prejudice towards specific or software program. Readers with an engineering measure could be reminded of the psychrometric tactics linked to heating and air con as they study of some of the controls schemes utilized in the range of heating and air-con procedure varieties they're going to encountered within the box. upkeep technicians also will locate the ebook valuable since it describes a variety of regulate and regulate innovations that have been utilized in the previous and are known in so much latest heating and air-con systems.

Designers of recent platforms will locate the basics defined during this ebook to be an invaluable start line, and they'll additionally reap the benefits of descriptions of latest electronic applied sciences and effort administration structures. This know-how is located in sleek construction HVAC approach designs.

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Extra resources for Control Systems for Heating, Ventilating, and Air Conditioning

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The valve is fully open. On a rise in temperature the controller breaks contact A and makes contact B, establishing a circuit through SW1 to the coil and restarting the motor. As the valve starts to close SW2 closes and makes the maintaining circuit. When the valve is fully closed, the cam opens SW1, stopping the motor. In case of power failure the three-wire motor will stop and stay wherever it may be. The spring-return motor will return to normal position. These motors may be provided with cam-operated auxiliary contacts that open and/or close at any desired point in the rotation.

Expansion of the fluid in the heated bulb exerts a pressure that is transmitted by the capillary to the diaphragm and there translated into movement (Figure 2-11). The sensing bulb may be only a few inches long, as used in a pipe or a tank, or it may be as long as 20 feet when used to sense average air temperature in a duct of large cross section. Special long bulbs are used for freeze protection. Refrigerant is used in this type of bulb, as the refrigerant will condense at freezing temperatures, causing a sharp decrease in pressure if any part of the bulb is exposed to low temperature.

The remaining oil and dirt may be removed in a three-micron high efficiency filter. 3 Pressure-Reducing Valves The control manufacturer can and does supply the pressure reducing valves as part of the pneumatIc control system. If a dual-pressure system is used, then two reducing valves will be used, in series, as in Figure 2-28. 4 Air Piping and Accessories Air distribution piping systems often use soft copper tubing with soldered fittings. Compression fittings may be used at equipment connections.

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