Document Dvny1voMNvKnnaM5M1gn7zGOQ

Heating Systems Steam Systems Specialties C. A. Dunham Company . Administrative and General Offices 450 E. Ohio Street, Chicago, 111. Factories: Marshalltown, Iowa; Michigan City, In.; Toronto, Canada; London, England TORONTO, 1523 Davenport Road. LONDON, Mordbn Road, S.W.19 THE DUNHAM DIFFERENTIAL HEATING SYSTEM -The Dunham Differential Heating System, circulating sub-atmospheric stStm, maintains desirable temperatures throughout a building by automatic control of both steam temperature and steam volume. The system is a simple two-pipe system in which all the essentials of circu lation, distribution and control are co-ordinated. Control of the temperature of the steam is accomplished by controlling the pressure or vacuum of the steam in the supply piping and radiators to balance exactly the heat input with building-heat-loss. THE DUNHAM "Victory Line" VAPOR AND VACUUM HEATING SPECIALTIES DUNHAM "VICTORY" RADIATOR TRAP For Operating Pressures .Up to 15 Lbs. Gage Cast iron body and cap. Thermostatic element is phosphor bronze. Valve and valve seat are cuprous alloys. Thermostatic elements are interchangeable in covers without gages. "Victory Line", covers and disc assem blies are interchangeable with standard traps. Connections are female left-hand threaded inlet and female right-hand threaded outlet. RHPIPC TAP' Tr VIA V2B V3A Size Id. Pitt. No, Tap ping In. Cap. Sq Ft EDR Net Wgt. Lbs Dimensions in Incites A BCD Vi AP '/7 200 l'/z 2'/* IV* 2% 2% 7y** AP AP V* y. 400 2'h 2V* lJ/ 2V 700 2V, 2y. l V* 2y* DUNHAM "VICTORY" RADIATOR VALVE (SPRING PACKED) Non-rising handle and low bonnet. The body and bonnet are cast iron, handle is non-breakable, heat resisting composition.' Other construction features; Quick opening with less than one turn of handle; heat-resisting graphited asbestos ring with metal core. Held under compression by heavy coil spring to maintain tight seal around valve stem; ball joint insures perfect seating when valve is closed on rounded valve seat; high quality renewable composition disc. Made in %*and 1-in. sizes angle pattern only with tapped right-hand female inlet, left-hand female outlet. 1 ype INo. Size Inches V740 V740 1024 y* I Dimensions in Inches ABC Net Weight 1 in Lbs iy. iv* .3% iy* iy. 0* 3% 2'/a C. A. Dunham Company Heating Systems Steam Systems Specialties TypeR DUNHAM UNIT HEATERS Type C--A specially designed unit heater for industrial and com mercial applications. Designed for discharging large volumes of heated air downward to workipg levels, distributing heaf-evenly over large areas. Built in various sizes up to 2000 sq ft EDR. Four types of diffusers. Type R--Blower type unit for in Type V dustrial and commercial applications. Available in standard sizes, each with various combinations of Btu and cfm output. Floor, wall and suspended types, with and without by-pass or mixing dampers. All sizes and types either direct connected or belt drive. Type V---Horizontal propeller fan type. Built in various sizes up to 1200 sq ft EDR. DUNHAM PUMPS Tested and Rated with A.S.H.V.E. Code and Code of Vacuum Return Line Heating Pump Manufacturers' Section of Hydraulic Institute. Vacuum Pumps Type VRD--Capable of maintaining whole sys tems under vacuums as high as 25 in. Built in 9 sizes. Capacities 2500 to 65,000 sq ft EDR. Type VR--Meets all code tests for air and simultane ous air and water handling capacities. No moving parts or close clearances in exhauster unit. Built in 11 sizes. Capacities 2500 to 150,000 sq ft EDR. Type VRD Type DV Condensation Pumps Pump and motor assembled on rigid cast iron base. Bronze fitted centrifugal pump has non-corrosive shaft. Enclosed type Impeller. Liberal size ball bearings. Type CH-Model B, Single and Duplex--66 sizes of varying capacities and discharge pressures. Capaci ties 2000 to 50,000 sq ft EDR; 60 cycle d.c. or a.c. 1750 rpm; 25 or 50 cycle a.c., 1450 rpm. Type CHH-Model B, Single and Duplex--49 sizes of varying capacities and discharge pressures. Capaci ties 2000 to 50,000 sq ft EDR; 60 cycle d.c. or a.c. 3450 rpm; 25 or 50 cycle a.c., 2850 rpm. .* Type CH, Model B, Single Type CH, Model B, Duplex Type CHH, Model B. Similar Construction to CH Model B. Available in Both Single and Duplex Type CH, Model A Available in Both 'Single and Duplex OTHER "VICTORY" LINE SPECIALTIES Float and Thermostatic Traps 8 sizes, 800 sq ft to 20,000 sq ft. Closed Float Traps 8 sizes, 800 sq ft to 20,000 sq ft. High Pressure Traps (Inverted Bucket) Vi in. and 5i in. sizes; up to 150 lb. Return Traps 5 sizes, 1500 sq ft to 13,000 sq ft. Pressure Reducing Valves Single seated (Type 340) % in. to 3 in. Double seated (Type 300) 1J4 in. to 10 in. Standard Flanged. Strainers in to 2 in. 1025