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Hoffman Specialty Company Heating Systems StCSQJ Q/4 Hot Water HOFFMAN "PANELMATIC" HOT WATER SYSTEM CONTROLS' Designed for all Types of Radiant Heating The Hoffman method vastly improves the ordinary forced hot water system bv th application of Continuous Circulation. This method permits a smoothly modulated regulation of the heat supply. The Control Valve closes and the circulating stream by-passes the boiler as long as the heat requirements are satisfied. m When the circulating water begins to lose heat, the Control Valve is slowly opened by the Controller, permitting hot boiler water to efiter the system. Thus, the delicate precision of the Hoffman Controller smoothly varies the temperature of the contin uously circulating water so . that the heat supply is always equalized with the heat loss and room temperature re mains constant throughout all changes in the weather. There is no type of build ing to which Hoffman Hot Water Controlled Heat can not be applied. The system permits zoning of apart ments, institutions, large residences and factories thereby assuring a distribu tion of heat in direct relation to either personal tempera ture preference or to the functional activities of the building. HEATING COMFORT IS ACHIEVED BY THESE SIX HOFFMAN SPECIALTIES The Panelmatic Controller The brain of the Hoffman system. It automatically maintains a constant comfort condition regardless of the outdoor tempera ture. Its accurate balancing mechanism electrically opens or closes the Hoffman Hot Water Control Valve as required. Outdoor Temperature Anticipating Bulb C-- . This Bulb transmits changes in the outdoor temperature to the balancing mechanism of the Comfort Controller. Hot Water Control Valve Opens only sufficiently to supply the correct amount of water to main tain the proper water temperature being circu lated through the system. Thermometer. Should be installed about 6 in. from submerged Water Temp. Bulb. Balancing Orifice A calibrated orifice used to balance the cir cuits through the boiler and through the Hoffman circulating pipe. Hot Water Temperature Bulb Accurately relays temper*-'. ) ture changes of the supply main uy, water to the balancing mechan ism of the Hoffman Comfort Controller. Hoffman Circulator A centrifugal pump of pre scribed capacity and low in power consumption. Usually installed in the return main and continuously circulates the water through the system. Continuous operation puts less strain and wear on the pumg motor than intermittent operation as any engineer will attest. 1390 Hoffman Specialty Company Healing Systems fgftSiE HOFFMAN PANEL-FLO VALVES for adjusting the flow of water through individual Panel Heating Coils Gives a wide range adjustment of water flow to each coil with out affecting the heat output of the other coils--can cut flow through coil as much as 60 per cent. . . WITH NO APPRECI ABLE CHANGE IN CIRCULATING PUMP HEAD. Has indicating Dial for accurate setting of each coil--or adjusting any coil without affecting the other coils. in. pipe connection. HOFFMAN INVERTED BUCKET TRAPS Working Pressures to 200 lbs Simple mechanism assures high operating efficiency. Features include--straight-through pipe connection; simple seat adjust ment; all working parts connected to bonnet and easily removed with it; stainless steel seat and pin. HOFFMAN PRESSURE RE DUCING VALVES Series 600 Series 710 Max. Press. 250 psi., Low Press. 5 to 80 psiSeries 700 Max. Press. 200 psi.. Low Press. 1 to25psi. Choice of types specifically engineered for your needs--continuous service, or, for tight sealing against low pressure side when there is no demand--and with typi cal Hoffman features of design. Series 7io HOFFMAN TEMPERATURE REGULATORS Series itOO Series 1100--for steam pressure to 150 lb per sq in. Standard temperature range--80 F to 250 F. Otner ranges available on special order. Self-motivated. Hydraulically formed bellows of selected material. Rugged construction. For water heaters, convectors, fuel oil preheaters and other similar applications. HOFFMAN "ZONET" ZONE CONTROL iSeries 1200--Zonet systems or packages for Steam and Hot Water consist of heat anticipating Room Thermostat, motor operated Globe T^rpe Valve, Transformer, Fuse Block and fuse, and in the case of steam zoning, a Vacuum Breaker. The motor operated, two position, single seated, packed globe type Valve (illustrated) is available in sizes from in. to 6 in. Maximum service pressure: steam 100 lbs per sq in., water 150 lbs per sq in. Hoffman Room Thermostat HOFFMAN electric controls Hoffman offers a comprehensive selection of fine quality electric controls for steam, hot water and warm air heating systems. These controls are especially suited for use with other famous Hoffman heating system specialties and provide one source of supply and one responsibility for satisfactory performance. Illustrated are two popular control units, typical of the complete Hoffman line. 1391 Hot Water Limit Control Immersion Tppe