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Temperature and Humidity Control Johnson Service Company TEMPERATURE AND HUMIDITY CONTROL General Offices and Factory Milwaukee, Wis. Branch Offices in all Large Cities Johnson Temperature Regulating Co. of Canada. Ltd., 97 Jarvis Street, Toronto, Ont. Montreal, Que. Winnipeg, Man. Calgary, Alb. Vancouver, B. C. Products and Services Manufacturers, engineers, and contractors for Automatic Temperature and Humidity Control Systems applied to all types of heating, ventilating, and air conditioning in stallation's. Temperature and Humidity Control for every range required in manufacturing and industrial processes. Johnson "Duo-Slats" to maintain the proper relationship between outdoor and radi ator temperatures. j Periodic Flush Systems for intermittent flushing in various sections of a building, reducing load on piping system and insuring economy in use of water. Special bulletins and catalogues on request. Johnson All-Metal Thermostats Room Thermostat All Johnson thermostats, both room and insertion types, are all-metal . throughout, having no soft or hard rubber parts to deteriorate and become inoperative. Every thermostat is precise in construction and is thoroughly tested for accuracy, efficiency, and durability. The Johnson intermediate action thermostat gives a true graduated motion to mixing dampers and valves. It holds them in an intermediate position to maintain the temperature of the room accurately within one degree above or below the setting of the thermostat. Johnson diaphragm valves are simple and rugged. Seamless metal bellows and heavy spring operate the valve stem. No complicated moving parts. Johnson Dual or Two-Temperature Thermostat The Dual, two-temperature, thermostat is especially adapted for use where various rooms or groups of rooms are occupied when the remainder of the building is not in use. Separate steam mains are avoided. The shifting from "day" or occupancy tem perature to an economy temperature for "non-occu pancy" conditions, is accomplished by a switch or Johnson program clock at a central point. Push buttons on the thermostat are provided when "oc cupant control" is desired. Dual thermostats are allmetal and operate valves and dampers gradually to maintain temperature accurately within one degree. Dual Thermostat Svivhm Vaiw Humidostats and Humidifiers The Johnson humidostat automatically controls the supply of moisture delivered to the air by a humidifier or air washer and maintains a con stant percentage of relative humidity. Available in both room and insertion patterns and with elements as determined by requirements, the most sensitive controlling within 1 per cent at relative humidity of 95 per cent for 100 degrees F. , Johnson humidifiers are furnished in steam "grid" type or pan type with copper evaporating pan, brass heating coil, and float control. Room Humidostat (Cover removed) 770 Johnson Service Company Temperature and Humidity Control Automatic Regulation of Ventilating and Air Conditioning Insertion thermostats in one, two, three, and four-point patterns for operating valves and dampers successively at dif ferent temperatures. Direct or reverse acting and in various ranges of sensitivity from one degree to twenty degrees. Dif ferential thermostats to maintain desired temperature differences between two points such as outdoors and treated space. Pour-point Multiple Thermostat liemote readjustable thermostats, re-set from a distant point by pilot or differential thermostat or by pressure switch. Solenoid air switches, manual switches, static pressure regulators, velocity regulators operating dampers to regulate flow of air in ducts. Pneumatic Switch Process Control Adjustable range and calibrated insertion thermostats for controlling temperature of liquids, air and gases. Mercury extended tube thermostat for use where remote location of sensitive element is necessary. Wet and dry bulb thermostats for close regulation of hu midity. Remote Readjxutable Thermostat Zone Control Johnson "Duo-Stats" to regulate the flow of heat in a group of radiators constituting a "heating zone" by maintaining the proper re lationship between outdoor and radiator .tem peratures. Program Clock ' /