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-------------- C.-A.DunhamCompany_________________ HeadngSystems i,?'/en,s DUNHAM THERMOSTATIC STEAM TRAPS--TYPE TH For Working Pressures 25 Lb to 100 Lb Construction--Type TH traps are the thermostatic fluid expansion type. The trap consists of two principle parts, a body with renewable valve seat and a cover containing the expansion thermostat. Permanent adjustment for correct operation is built into the element. The covers may be removed from the trap body while hot with out danger to the thermostatic element. The valve is swiveled to insure its seating tightly without causing localized stresses on the element. Body, cover, nut and nipple are of brass; valve and seat are of special heat treated stainless steel; thermostatic element is formed from monel metal sheet. Trap Size Size Conn. Inches Dimensions, in Inches ABc TH1 'h 3'4 m TH2 V. i'A \% TH3 1 P/4 Working Pressure (lb per Sq In. Gage) Capacity Pounds Condensate per Hour 25 35 50 100 1200 1800 2500 1550 2200 2900 1950 2600 3400 2600 3500 4500 Traps shall start discharging with a temperature differential (i.e difference between temperature of discharging water and that of saturated steam of same pressure as that on the trap) of about 30 to 40 F. DUNHAM TYPE OTS HEATING ELEMENT Capacity Ratings \\i In. OTS Heating Element ' Element Number *`L" Length Inches I Lb Steam--65 Deg Entering Air Btu Rated EDR OTS-418 18 1880 7.8 An extended surface heating element made entirely of steel. Light in weight, and has unusual heating capacity. OTS-424 OTS-436 OTS-448 OTS-460 24 2525 10.5 36 3815 15.9 48 5105 21.3 60 6395 26.7 Each element is made up of 1)4 in. steel OTS-472 72 7685 32.0 pipe with No. 22 gage heavy fins me chanically attached, eliminating the use of a solder boild without sacrifice of heat trans fer. Each fin, when pressed on the pipe, interlocks with the preceding fin--forming an exceedingly tight and permanent mechanical joint. The complete unit is painted with heat-resisting zinc chromate black enamel. See table for standard lengths. Lengths up to 12 ft can be supplied by welding two standard lengths together. Standard units are threaded at each end with standard pipe threads. DUNHAM CABINET CONVECTORS Dunham Convectors can be used on steam or vapor and gravity or forced hot-water heating systems. EDR capacities with 1 lb steam, 65 deg entering air range from 14^ sq in. EDR to 110M sq in. EDR. Made in 5 in., 7 in., and 11 in. widths; 22 in., 26 in., 30 in. enclosure heights; casing lengths from 16)4 in. to 61)4 in. Casings are constructed of No. 18 gage steel with removable fronts. Outlet grille is punched in the casing front. Front outlet grille dampers can be furnished when so ordered. Heating element is copper fins on seamless drawn, round copper tubes brazed to bronze headers. These elements withstand hydrostatic test pressures of 400 lb per square inch and are suitable for opera tion on 150 lb steam or water working pressure. Type WCF 1084 Type WCST C. A. Dunham Company Heating Systems Steam Systems Specialties DUNHAM-UNIT-HEATERS------- Types C and R are essentially industrial type units designed for heating large spaces. Type C, discharging large volumes of heated air downward to working levels distributes heat evenly over large areas. Type R is available in various types of mounting as shown. Various appurtenances satisfy requirements such as, mixing Type V--Horizontal Type R--Floor Type with mixing damper dampers, by-pass dampers and filter sec tions for heating and ventilating or for heating only. All units have belt driven centrifugal type fans using constant speed propeller fan type. Built in various sizes up to 1800 sqft EDR 1750 rpm motors. All essential easily accessible. Complete heat ing element and complete fan and shaft assembly can be removed through either end of heater casing. Heating element is replaceable tube type, made up of seamless drawn copper tubes, wound with a copper fin in the form `of a helix and metallically attached. Tubes are securely fastened into one piece semi-steel cast headers by means of brass clamping nuts. Type C--Built in various sizes up to 8000 sq ft EDR. 4 types of diffusers Type R--Floor Type with elongated nozzle Type R--Wall Type Type R--Ceiling Type TypeR--Inverted Wall Type 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 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 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. 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. OTHER DUNHAM 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 sqft. High Pressure Traps (Inverted Bucket) Vi in. and M in. sizes, up to 150 lb. Bucket Traps l/% in. to 1 M in. for maximum of 250 lb; H in., M in. for 150 lbs. Pressure Reducing Valves Single seated (Type 340) Min. to 3 in. Double seated (Type 300) 1M in. to 10 in. Standard Flanged. Strainers M in. to 2 in. 1085