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C. A. Dunham Company Heating Systems DUNHAM INVERTED BUCKET TRAPS Type OB For Operating Pressures up to 250 lb Type OBS For Operating Pressures up to 150 lb This high pressure trap vents air and drains water from steam lines, heat exchangers, sterilizers and processing equipment oper ating at their respective pressure ranges. It is particularly adapted to clearing high pressure distribution lines of condensate and to draining high pressure applications such as coffee urns, cooking utensils, laundry equipment, etc. It increases the effi ciency of heat transmission and holds equipment capacity to a maximum. Type OBS built only in $ in. and f in. sizes, right hand female tappings. Type OB sizes are \ in. to 1J in. inclusive. Body and cover are of high test semi-steel castings. Valve and seat (renewable and interchangeable) are constructed of especially hardened, corrosion resisting steel. Bucket is formed from sheet copper. Cover cap screws are steel. DUNHAM FLOAT AND THERMOSTATIC TRAPS 30 Series--For Operating Pressures up to 15 lb Gage Comprised of a cover, mechanism assembly and body. Thermo static disc and valve controls flow through a cored passage be tween trap body and discharge tapping for release of air. The float is cuprous material. Float valve and seat are monel metal. Ther mostat elements are interchangeable. Trap body readily removed without disturbing piping connections to fully expose working parts for inspection. All traps are tapped so that gage glass set may be applied, but traps are shipped plugged^ Bottom plug can be used for flushing out trap. . Dunham Closed Float Traps In Same Capacities Type VR Vacuum Pumps Made in 9 sizes from 2500 to 65,000 EDR to be applied in accordance with EDR load, no allowance necessary for piping. Furnished as single or duplex units with a separate accumulator tank to take care of low returns. Each auto matic pump has its own control panel wired through to motor. Selector switch on panel permits pump to operate on full vacuum and float control. Pump and motor assembled on rigid cast iron base. Bronze fitted centrifugal pump has non-corrosive shaft. Enclosed typelmpeller. Liberalsizeball bearings. \ Condensation Pumps Pump and motor assembled on rigid steel base. Bronze fitted centrifugal pump has non-corrosive shaft. Enclosed type impeller. Liberal size ball bearings. Type CH-Model C, Single and DuplexCapacities 2000 to 50,000 sq ft EDR dis charge pressures 20 to 50 lbs; 60 cycle d.c. or a.c. 1750 rpm; 25 or 50 cycle a.-c., 1450 rpm. Type CHH-Model C, Single and Duplex --Capacities same as type CH. Dis charge pressures 20, 30, 40, 50 and 70 lb 60 cycle d.c. or a.c. 3450 rpm; 25 or 50 cycle a.c., 2850 rpm. 1318 C. A, Dunham Company Heating Systems l'pSLtS,ems DUNHAM CABINET CONVECTORS With Non-Ferrous Heating Element DUNHAM CONVECTORS can be used on steam or vapor and gravity or forced hot-water Type FCF Cabinet Convector heating systems. EDR capaci ties with 1 lb steam, 65 F enter ing air range from 12 sq ft Type WCF Cabinet Convector EDR to 108 sq ft EDR. Made in 4 in., 6 in., 8 in. and 10! in. widths; 20 in., 24 in. and 32 in. enclosure heights; cas ing lengths from 18 in. to 64 in. Casings are constructed of No. 18 gage steel with re movable fronts. Outlet grille is punched in the casing front. Heating element is copper or aluminum fins on seamless drawn, round copper tubes brazed to bronze headers. These elements withstand hydrostatic test pressures of 400 lb per sq in and are suitable for operation on 150 lb steam or water working pressure. Cabinets also available in recessed'types, semi-recessed types and in sloping top. DUNHAM UNIT HEATERS Type R--Woll Type Type R--Ceding Type Type C--Built in various Type R--Inverted Wall Type sizes up to 2000 sq ft EDR. All units have belt.driven centrifugal type fans. Constant speed 1750 rpm. Type R--Floor Type with mixing damper also furnished with elongated nozzles Type M--Floor Mounting EDR. Dunham Tvoe M Unit Heaters can be installed in any position, discharging their lir directly upwards, directly downwards, or horizontally. Units must be ordered " it. S,,Pn " .W .ro t.e he set. so that proper mounting can be pro- 1319