Cyclopedia of Heating, Plumbing and Sanitation by American School of Correspondence American Technical Society

Author:American School of Correspondence , American Technical Society
Language: eng
Format: epub
Publisher: American technicalsociety
Published: 1909-03-25T05:00:00+00:00

Fig. 186. Qeneral System of Wiring a House for Electric Heating.

placed in the rooms to be regulated; and third, special diaphragm or pneumatic valves at the radiators.

The air-compressor is usually operated by water-pressure in small plants and by steam in larger ones; electricity is used in some cases. Fig. 167 shows a form of water compressor. It is similar in principle to a direct-acting steam pump, in which water under pressure takes the place of steam. A piston in the upper cylinder compresses the air, which is stored in a reservoir provided for the purpose. When the pressure in the reservoir drops below a certain

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HEATING AND VENTILATION

point, the compressor is started automatically, and continues to operate until the pressure is brought up to its working standard.

A thermostat is simply a mechanism for opening and closing one or more small valves, and is actuated by changes in the tempera-

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