Document wqBzZMwG8RjL3bZpmeG6Q5kME

C. A. Dunham Company Specialties, Heating Specifications, "DH" Series Dunham Differential Vacuum Heating System As Applied to the Heating of Residences 1.' GENERAL1 bONDITIONS.-- 2. CONSTRUCTION AND MATERIAL.-- 3. INSPECTION.-- Furnish and inVall in accordance with manufacturers' instructions a Dunham Air Eliminator, Type 220B. Install a Dunham Air Check, Type 222, in a tee from vent opening of Eliminator. (Paragraphs 1, t and S tame at "D" Series Specifications.) 4. BOILER.--The steam boiler shall bea---------- -----------with guaranteed rating for--------------------------------sq. ft. of direct radiation jpgfatiwi upon suitable foundation and in accordance with manufacturer's setting instructions. It whftll be equipped with all necessary connections and trim mings, including a safety valve set to blow at 10 lb. pressure, a Dunham Compound Gauge 15 ib. x 30 in. vacuum and a 10-in. Dunham Damper Regulator. (Omit Regulator on gas fixed and automatic oil fired installations.) 5. SMOKE PIPE.--Connect boiler to chimney with suitable iron wnnke pipe same sise as boiler smoke outlet. Smoke pipe must be provided with approved Dunham Check Damper and hand stop damper between check damper and boiler. (On gas and automatic oil fired installations omit Dunham Check Damper.) 6. PIPE AND FITTINGS.--Furnish and erect with tight connections all necessary piping ofsizes shown on plans and run as indicated, supported and properly graded to insure free and noiseless circulation. Uae fittingB of cast iron of standard quality. The ends of all pipes shall be reamed or filed. Proper provision must be made for expansion. Use graphite and oilfor making up all pipe joints applied to male thread only. 7. All staam tappings in boiler shall be connected full size of tapping into a steam heads which sbajl be dripped to the return header through a bleeder. All spring pieces to steam and return main* nall be taken off the top of mains at 45 deg. - 8. The end of each steam main shall be dripped as indi cated on tiie by means of a drip tine to boiler, properly - vented through Dunham " Dl " Trap in accord.with details furnished by manufacturer. 9. Grade steam mainw in. in 10 ft Grade return mains and drip mains 1 in. in lOit. All steam supply branches such as spring pieces, offsets in steam risers ana runout to radi ators shall in each case be installed one size larger than the vertical pipes to which they connect and shall be given as much grade as possible. H in. per foot is preferable. 10. Return "hall be connected to the Dunham Differential Vacuum Pump as shown in detail furnished by manufacturer. 11. Risers are to be run concealed or in the open as directed by the architect. All concealed piping must be tested and made tight at 15-lb. water pressure before being concealed and covered. 12. All union connections, flanges, packing nuts on gate frnH globe valves and on gauge glass ofboiler must be drawn up tight so*as to prevent air leaking into system when under a high vacuum. This work must be performed after system is completed while it is working with a vacuum in both steam and return tines. 13. FLOOR PLATES. SLEEVES.--Furnish approved floor and ceiling plates and protecting sleeves on au pipes panning through floors or finished partitions. 14. THERMOSTATIC CONTROL.--Contractor shall furnish install where shown on {Jans a Type 77 Min neapolis Honeywell Thermostat or other approved with D. S. Damper Motor and Switch according to Manufac turer's instruction. (If Thermostatic Control equipment is being supplied with oil or gas burner under another contract, then this Contractor shall connect Differential Vacuum Pump to the Switch of Thermostatic Control) 15. DIFFERENTIAL VACUUM PUMP AND AIR ELIMINATOR.--Furnish and install a DH2A Dunham Differential Vacuum Pump. The pump shall be installed and connected in accordance with manufacturer's instruc tions and details. The necessary electric wiring between pump and differential control shall be 'connected to Ther mostatic equipment in accordance with manufacturer's instructions and in conformity with all local regulations. 16. CHECK VALVES. --) Same as "D" Series Sperifi- 17. RADIATION.-- J cationt. 18. RADIATOR TRAPS, "D" SERIES, TEMPO RARY ELBOWS AND VALVES.--Each radiator shall be provided with a Dunham Temporary Elbow loaned by the manufacturer and "hnll be installed at outlet end of radiator to facilitate the thorough cleaning of the radiator. After the System has been cleaned, a Dunham "D" Series Radiator Trap of suitable capacity shall replace tins elbow. A Dun ham Packless Radiator Valve with Dunham Regulating Plate hihH be ipatyliwd at inlet connection according to manufacturer's instructions. The plates shall not be inserted in the valves until after the system has been cleaned, but before final test is made. 19. PAINTING.-- 20. COVERING.-- 21. FINISHING UP.-- I Same a* "D" Series Specifi( cations. 22. TEST.--The System when finished and cleaned shall be tested for tightness by Ailing it with water to its very top. Pockets of air in the piping or radiators must be vented ao as to allow water to enter. The water shall be left standing in the system at least four hours after all leaks have been made tight, when final test and inspection in presence of Dunham Representative be made for leaks. The con tractor must take precaution to guard against damage from freezing during test 23. GUARANTEE.--The Heating Contractor shall guarantee the apparatus installwH to circulate steam thor oughly through every radiator without noise, with a vacuum of 15 In. in steam main. If the apparatus shall fail to acGomplisb this guarantee by reason of any defect developing within the period of one full heating season and that defect is due to faulty material or poor workmanship, the Heating Contractor shall remedy such defect at his own cost within reasonable time after notice thereof. 24. FINALLY.--Nothing herein contained can be con strued to relieve the Heating Contractor from making good and perfect work in alt usual details of construction, and he will be held responsible to provide and furnish necessary material and to perform all necessary labor and to bear all expenses incidental to the satisfactory completion of the work. PRODUCTS In addition to the Dunham Differential Vacuum Heating System hereinbefore described the Dunham Line consists of specialties for use in connection with the Dunham Home Heating System; The Dunham Return System and the Dunham Vacuum Return Line System--all two-pipe systems, and the Dunham Air Line System for use in connection with one-pipe steam systems.. These specialties are Radiator Traps; Float and Thermostatic Traps; Air Line Valve; Return Traps; Medium Pressure Traps; Packless Radiator Valves; Pressure Reducing Valves; Vacuum Pump Governors; Air Eliminators; Air Check; Dirt Strainers: Air Vents: Damper Control; Gauges. In addition to the Dunham Differential Vacuum Pump already described, we build a full line of Vacuum Return Line Pumps, Condensation Pumps and Receivers; Centrifugal Pumps. Bulletins Bulletins of standard architectural size with de tailed information covering each Dunham Product and System, including roughing-in dimensions, will be furnished on request. 754 Specialties, Healing Hoffman Specialty Co., Inc. Waterbury, Conn. GENERAL SALES DEPARTMENT 25 West 45th Street, New York, N.Y. HOFFMAN VALVES and CONTROLLED HEAT EQUIPMENT HOFFMAN VENTING VALVES In the Hoffman line there is a specially designed venting valve for every type of steam heating system. The basic principle used in the design of all Hoffman venting valves is that of an all-metal thermostatic member, with one or more flexible diaphragms, containing a volatile or heat sensitive fluid which causes valve action upon slight tem perature changes. Hoffman valves have a wide pressure range in which they operate with the same degree of accuracy, for the internal fluid pressure in the thermostatic member maintains a constant relationship with the external steam pressures throughout the whole range of pressure for which each valve is intended. Hoffman valves are automatic, non-adjustable and guaranteed to properly function for a period of five years from date of installation when installed and operated under normal conditions for which designed. VENTING VALVES FOR ONE-PIPE SYSTEMS ALL METAL--rNON-ADJUSTABLE--THERMOSTATIC The No. 1 Hoffman Siphon Air Valve is designed for systems of the one-pipe gravity type, to vent all air from radiators without loss of steam. After contact of water with the valve the siphon drains all water from the valve and venting occurs without the slightest "spit" even if the radiator is under pressure. Radiator connection, 3/8 in. Maximum guaranteed operating pressure, 10 lb. Furnished with special short siphons for narrow pattern radiators. The No. 4 is used in venting mains, risers, vento stacks, coils, etc. All air is freely vented through a 34 in. vent port without steam toss, but valve does not close against water. Standard connection, in., can also be supplied with 34 in. connection. Maximum guaranteed operating pressure, 10 lb. The No. 5 is particularly adapted for use in venting: Ends of steam or dry return mains; Indirect radiators: Blast or "Vento" stacks; Hot-water generators; Dryers and- drums, etc. The basic principle is the same as the No. 1 Valve, having separate channels for air and water which are only found in Hoffman Valves. Pipe connection, % in.; vent port for less than 3 lb. is A in.; for 3 lb. and over is -fa in. Unless otherwise ordered, will be shipped with in. port. Maximum guaranteed operating pressure, 10 lb. Write for Descriptive Circular-- Ne.i Tke Watchman of the Coal Pile 755 No. s