Document anp90Bnw23yxvkZ1jgjdk3dY

Johnson Service Company Temperature Control Equipment mental and artistic as the R cover, and used more generally in schools, office buildings, hospitals and places where simple and neat design is desired rather than artistic and ornamental. Johnson Pneumatic Insertion Thermostat Designed to control temperatures with in closed air chambers or ducts. The body of thermostat is a dust-proof case containing the two working parts and extending outside the chamber. This thermostat is made either positive or graduated acting. Applications Adaptable for use in bake ovens for enamels, japans, etc.; drying rooms for paints, varnishes, patent leather, etc.; storage rooms for tobacco, rubber or similar goods; ster ilizers or pasteur izers; cold storage rooms, fur vaults, etc.; refrigerator machine control; hu Pneumatic Insertion Thermostat midity control for air washers; flue gas temperature con trol; hot blast heating plants; combi nation tempered ventilation and hot blast systems; greenhouses, turkish bath rooms, etc.; tempered, ventilation for buildings. Johnson Calibrated Thermostat This is an especially high grade insertion thermostat for use where it is desired to change frequently the adjustment to op erate at different temperatures. It is operated by compressed air at 15 lb. per sq. in., and used to control temperatures of liquids and air by automatically open ing and closing a diaphragm valve or damper. Graduations made to meet re quirements, limited to a total range of 60 deg. Multiple Insertion Thermostat Similar to the insertion duct thermo stat, excepting that one multiple thermo stat takes the place of a number of sepa rate duct thermostats set for dif ferent tem peratures. The 4-point multiple thermostat shown will operate four separate diaphrag m valves at as many differ ent temperatures. It has Multiple Insertion Thermostat become very popular with heating engi neers for the control of heating and tempering coils where it is desired to have these coils turn on at different temperatures. It is made to work with positive action when controlling valves; with graduated action when controlling dampers; or with both positive and graduated action when controlling valves and dampers. 538 Johnson Service Company Temperature Control Equipment Tank Thermostat Humidity Control Designed for insertion through 1-in. tapped hole in tank and controlling, in the case of hot water tanks, a diaphragm valve on the supply pipe to the steam coils in the tank. It can be used to control the temperature of any liquid, either hot or cold. It is especially adaptable for con trolling the temperature of water in hot water heating plants by its control of the boiler draft doors. The supplying of moisture to the heated 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 proper tem peratures. Pneumatic Switch Control Remote valve and damper control plays, by means of our pneumatic switches, Humidostats and Humidifiers a very important part in the economical The humidostat automatically controls the supply of moisture delivered to the air by a humidifier and maintains a con stant percentage of relative humidity. It operates a diaphragm valve on the steam coils in the pan humidifier. The pan is provided with float box to maintain constant water level and is located in the ventilating air duct leading throughout the building. Steam jet and water spray types of humidifiers are also furnished. operation of the modern heating plant especially in schools. It saves the janitor'stime for other duties, and makes it possible to ac Pneumatic Switch complish re "Sylphon" Metal Diaphragm Valves sults in the operation of the heating plant This valve having an in destructible 1- piece metal diaphragm, is permanentand requires no repairs. Its value for the control of steam is ob vious and par ticularly so in connection with steam coils, radiators in wall boxes "Sylphon" Metal Diaphragm where exces- Value s i v e heat would destroy rubber diaphragms. which can not be obtained in any other way. It makes it easy to operate the fresh air, return air and vent dampers, with the corresponding assurance that these dampers will be economically op erated as intended by the heating engineer. The following types of pneumatic switches for different purposes and dif ferent conditions are made: Lever Handle Switch, Push Button Switch, Indicating Switch, to open and close dampers partially as desired. E1ectro Pneumatic Switch, to open and close dampers automatically--with the starting and stopping of fan motors. 539