Document npNvJR9o6o6w04qo81obNKaqw

C. A. Dunham Company Heating Systems VERTICAL DISCHARGE TYPE Type C. Discharges air stream verti cally downward. Four types of diffusers available. Heating element of non-ferrous mate rials. Fins are copper or aluminum. Tubes are heavy copper--expanded into firis to provide a positive permanent mechanical bond--then silver soldered into cast bronze or copper headers. Manufactured in 7 sizes. Capacities at 2 lb steam, 60 deg entering air: 32,800 to 492,000 Btu per hr. Type C Healer BLOWER UNIT HEATERS Ceiling type heater. Also available in floor, wall and inverted types. Type R. Available with mixing damp ers, by-pass dampers and filter sections for heating and ventilating large areas, or for heating only. Belt-driven centrifugal type blower fans use constant speed 1750 rpm motors on 60 cycle or DC current. Fans are double width, double-inlet type with forward pitched blades. Self-aligning, dustproof ball bearings support fan shaft. Heating element is replaceable tube type. Working pressure: up to 150 psi steam. Capacities at 2 lb steam, 60 deg entering air: 105,000 to 822,500 Btu per hr. Gas-Fired Hexder GAS-FIRED UNIT HEATERS AND DUCT FURNACES Combustion chamber and heat exchanger are of Aluminized Steel combining sur face characteristics of aluminum with mechanical and physical properties of steel. Chamber and exchanger are welded together to form gas-tight, onepiece construction that lasts longer than heavier gage furnace steel, resists corro sion, assures rapid heat transfer, with stands temperatures up to 1600F with out destructive scaling. Made in 7 sizes for 70,000 to 230,000 Btu per hr input. 1478 Radiator Traps For all types of low pressure steam heat ing systems up to 25 lbs gage. Dunham design assures freedom from clogging; thorough draining of radiators by grav ity; minimum wear on parts. Body and cover of cast bronze; disc of Monel metal. Round, slightly raised valve seat minimizes depositing of in- crustrants. Size nr 2E 3C Pattern AP SW RH LH VST AP SW AP Tapping y? H' Uap. Sq Ft EDR 200 \ 400 700 Ratings are based on K lb condensation per sq ft of EDR per hour and a.lM lb pressure differential. Thermostatic Steam Traps Operate in response to pressure caused by partial vaporization of liquid within thermostatic disc. Permanent adjust ment for correct operation built into trap at factory. Body, cover, union nut and nipple are brass. Valve and seat are special heat-treated stainless steel. Spherical valve is swiv eled to insure tight seating without causing localized stresses on disc. Ex ceptionally large valve opening permits ready passage of water or dirt. For 5 to 100 pounds working pressure-- Made in in., f in. and 1 in. sizes, for capacities from 125 to 1780 lb Cond./hr. Thermostatic Steam Trap Type TH-IA Radiator Trap, No. IE, SE, SC Float and Thermostatic Traps Especially adaptable for service-as a drip-trap for dripping ends of steam mains, unit heaters and all types of heat exchangers. Capable of handling large amounts of air and water. Float is made of copper. Float valve and seat are Monel metal. Body can be removed for inspection of working parts without disturbing piping connections. Operat ing pressures up to 15 psi gage. Sizes: ) in., 1 in., 1)4 in., 1% in., and 2 in.; respective capacities: 800, 2000, 4800, 9600 to 20,000 EDR at l4 lb condensate per sq ft per hr with 2 lb pressure differ- tial. Series 31 [closed float traps avail Float and Thermostatic Trap, Series SO able in same capacities. Inverted Bucket Traps inverted Bucket Trap For venting air and draining water from high pressure steam lines, heat exchangers, sterilizers and processing equipment. Traps increase heat transmission efficiency and hold equip ment capacity to a maximum. Body and cover of high tensile iron castings. Valve and seat (renewable and interchangeable) are special hardened, corro sion-resistant steel. Sheet copper backet. Capacities range from 400 lbs to 5600 lbs of condensate per hour. Operating Pressures: 20 to 150 lbs gage. Sizes: Type OBS J4 and )4 in. Type OB )4 to 1)4 in. inclusive. 1479