Document OzYnoE0QwQ42LDoR65zz494e1

Johnson Service Company Control Equipment either hot or cold. It is especially adapt able for controlling the temperature of Pneumatic Switch Control Remote valve and damper control water in hot water boiler heating plants plays, by means of our pneumatic by its control of the boiler draft doors. switches, a very important part' in the e c o nomical Humidity Control The supplying of moisture to theheated air in buildings and the automatic control of the percentage of moisture in this air are recognized by authorities to be as important as maintaining prop:r temperatures. operation: of the modern heatingplant especially in schools. It saves the janitor's time for other Humidostats and Humidifiers duties, and makes itpos- Pneumatic Switch The humidostat automatically controls sible to ac the supply of moisture delivered to the complish results in the operation of the air by a humidifier and maintains a con heating plant which can not be obtained stant percentage of relative humidity. in any other way. It makes it easy to It operates a diaphragm valve on the operate the fresh air, return air and vent steam coils in the''pan humidifier. The . dampers, with the corresponding assur pan is provided with float box to main ance that these dampers will be economi tain constant water level and is located cally operated as intended by the heat in the ventilating air duct leading ing engineer. throughout the building. Steam jet and water spray types of humidifiers are also furnished. i The following types of pneumatic switches for different purposes and dif ferent conditions are made: "Sylphon" Metal Diaphragm Valves This valve having ah in destructible 1- piece metal diaphragm, is permanent and requires no repairs. Its value for the control of steam is ob vious and par ticularly so in conn e c tio n with steam coils, registers in wall boxes "Sytyho*'' Metal Diaphragm where exces- v<tlve siv e heat would destroy rubber diaphragms. | Lever Handle Switch, Push Button Switch, Indicating Switch, to'"open-and close dampers partially as desired. Electro Pneumatic Switch, to open and close dampers automatically with the starting and stopping of fan motors. Time Valve Control Simple device for automatically and -periodically opening and closing a dia phragm valve. Has many applications, such as peri odically. flushing' of toilets, etc. Being simpler and more powerful in action, it is much superior to float tanks. Eightday clock, valve mechanism operates dia phragm valve on water supply by means of compressed air. Valve may be ope rated from 1 to 4 times per hour and for periods of 15 seconds to 5 minutes. 260 Johnson Service Company Control Equipment How to Specify Furnish and install a complete system of- automatic temperature regulation and humidity control, furnishing all neces sary thermostats, valves, dampers, hu compressor shall'be of sufficient size to operate the system, with a factor of safety not less than 3, and requiring that it be provided with all necessary govern ing devices, fittings, gage, etc. midifiers, special devices, air compres Humidostats--Specify Johnson Hu sors, piping and fittings, and labor of midostat and Humidifier, stating the installing system, except setting valves kind of humidifier, whether perforated and dampers in position--all in accord steam or copper evaporating pan. ance with the following schedule and detailed specification: Dampers--Specify that dampers shall be made by the heat regulating contrac Schedule--State the rooms to be con tor, but installed by the galvanized iron trolled and number of thermostats in contractor, and that dampers shall con each; the manner in which the tempered sist of wrought iron frames, sheet steel air, if there is any, is to be controlled; blades, strongly cleated, with brass the manner in which the drafts of the bearings. boiler are to be controlled; and specify the manner of the control of any fresh Guarantee--Require that system be air, vent or return air dampers, stating complete in every respect, and that all the location and number of switches. . necessary material and special fittings shall be furnished whether specifically Thermostats--Specify Johnson Metal mentioned or not. Require that entire Diaphragm Model Thermostat, size, 4J" system be guaranteed -free from all orig by 2" by 1"; and state whether, it is to inal defects in material and workman ; have residence or school cover, indicating ship, and that any parts proving defec device, positive shut-off, and whether-it tive or wearing out within 2 years from is to be positive or intermediate motion. date O'f completion: shall be replaced free Specify the number and kind of inserted . of charge. Require that thermostats thermostats. shall operate the valves or dampers to i which they are attached, at a variation of Valves--Specify Johnson Metal Dia l not to exceed 1 above or below any phragm Valve having the "Sylphon" Metal Bellows for its diaphragm. State given point. whether valves are to be plain or nickelplatcd with or without, unions; add: Contracting Valves to be placed in position by heat ing contractor. This company contracts to furnish and install in complete working order the Air Compressors--Specify kind of air compressor (steam, hydraulic, electric or power driven), requiring that the air Johnson System of Temperature Con trol, including thermostats, valves, pip ing, etc. 261