Document 43m85nvQY0pN0NadEb0V98J1

Heating Systems Steam Systems Specialties C. A. Dunham Company Administrative and General Offices 450 E. Ohio Street, Chicago 11, 111. Factories: Marshalltown, Iowa; Michigan City, Ind.; Toronto. Canada; London, England TORONTO 4,1523 Davenport Road. LONDON, Morden Road. S.W.19 THE DUNHAM DIFFERENTIAL HEATING SYSTEM The Dunham Differential Heating System, circulating sub-atmospheric steam, 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 assemblies are interchangeable with standard traps. Connections are female left-hand threaded inlet and female right-hand threaded outlet. Fig. 8898 Type No. VIA V2B V3A Size In. Patt. No. Tap* ping In. Cap. Sq Ft EDR Net Wgt. Lbs Dimensions in Inches ABCD 8 8 $ % &AP 200 AP 400 i'/. 256 i>/, 356 y. AP V. 700 m IV. m m 356 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 %eal 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. Fig. 8394 Type No. Inches V740 V740 y. \ 1048 Dimensions in Inches A Bc iy. y 3?6 iy. 3% Net Weight in Los iy. m C. A. Dunham Company Heating Systems Steam Systems Specialties 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 i P1 Types DV and DVD--Capable of maintaining whole systems under vacuums as high as 25 in. Built in 9 sizes. Capacities 2500 to 65,000 sq ft EDR. Types VR and VRD--Meets all code tests for air and simultaneous air and water handling capacities. No moving parts or close clearances in exhauster unit. Built in 9 sizes. Capacities 2500 to 65,000 sq ft EDR. Condensation Pumps Types DV and VRD 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--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--Capaci ties same as type CH. Discharge pressures 20 lb for pumps 15,000 sq ft and larger; 20, 30, 40, 50 and 70 lb discharge in all sizes. 60 cycle d.c. or a.c. 3450 rpm; 25 or 50 cycle a.c., 2850 rpm. Types VR and DV Type CV--Capacities 2000, 4000, 6000, 8000, 10,000, 15,000, 20,000 and 25,000 sq ft EDR; and discharge pressures 10 to 50 lb. Motor shaft through cover in liberal size packing gland eliminates possibility of moisture rising into motor float mechanism. Also packless type. Type CH, Model B, shown. Type CHH, Model B, similar to CH, Model B, available in both Single and Duplex. DUNHAM UNIT HEATERS Type G--A specially designed unit heater for industrial and com mercial applications. Designed for discharging large volumes of heated air downward to working levels, distributing heat 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 dustrial and commercial applica tions. Available in standard sizes, Type V 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--belt drive only Type V--Horizontal propeller fan type, Built in various sizes up to 1200 sq ft EDR. Type R--With Mixing Damper Type R--Wall Type Type R--Ceiling Type Type R--Inverted Wall Type 1049