Document re9V0VVLDmRoqvQ3dEko6wKGJ

Controls and Instruments THE POWERS REGULATOR CO. Over 60 Years of Automatic Temperature and Humidity Control Factory and General Offices: Skokie, 111. Offices in Over 60 Cities, U.S.A., Canada and Mexico, see your phone book. Hew York 17. N. Y. 231 E. 46th St. Los Angeles 26, CaL 3200 W. Temple St. Chicago 13. I1L Export Dir. 3819 N. Ashland Ave. Ameresco Inc. Toronto Downsview, Ont. Montclair. New Jersey 15 Torbarrie Road 33 Watchung Plaza ABC Some of the many controls employed in a Powers pneumatic control system for heating, ventilating, air conditioning and industrial processes are shown here. Controls for water heaters, fuel oil preheaters *and heat exchangers appear on third page. Powers Thermostats have true gradual action with no constant bleed of com pressed air. They give many years of dependable control with practically no maintenance. Various types for specific applications are available. Some are shown at left. A)Type D Single temperature range room thermostat has durable stamped brass cover and plastic insulating base. Because of its small size 5% H x 2% W x 2% in. deep, it fits into narrow vertical spaces. B)Type D Two-temperature range Day-Night thermostat. C)Type 190 Room Hygrostat for humidity con trol, duct type also available. D)Type D Summer-Winter remote bulb thermo stat for air conditioning units. E) Limitern thermostat for unit ventilators and ducts. F) Type K remote bulb thermo stat. G) Type K remote bulb Submaster thermostat. H) Accritem Temperature Regulator has adjustable sensitivity and calibrated dial adjustment with ranges 50-250F and 150-350F. J) Static Pres sure Regulator for air ducts. Powers Series 100 Recording and Indi cating Controllers also control switches, gages, etc., are available in a variety of models; some are shown on control panels on next page. Powers Packless Control Valves (K fmd L) are made in various types and sizes for convectors, unit ventilators, unit air conditioners or coils in ducts. With their durable construction, ample power and Duo-Seal paGkless feature # they eliminate normal packing gland friction and give better control. They eliminate steam or water leakage, loss of vacuum and packing maintenance. 314 The Powers Regulator Co. Controls and Instruments uiYu r cil\ i ilia i Kjxjjy '1'tcuJD Tow ers latest advancement the LIMITEM Thermostat (E on previous page) is a precision instrument engineered to pro vide accurate low limit control of unit ventilator discharge temperatures ... a critical requirement for classroom com fort. It has sturdy construction, accu rate response, Powers famous NONWASTE double air-valve with adjustable sensitivity and graduated temperature dial for changing the control point. It is fully described in Bulletin 808. Modern Control Panel employing vari ous types of Powers pneumatic control ling, indicating and recording instru ments which regulate four complete year round air conditioning systems. Powers MASTROL Systems for control ling forced hot water heating, radiant panel heating, etc., are available in various combinations of Master and SubMaster controls. Control panel below shows MASTROL system using Powers Series 100 Recording Master Controller readjusting Sub-Master Indicating Con trollers. Left: Powers Wet arid Dry Bulb Recording Controlier with motor driven fan. Powers FLOWRITE diaphragm valves. See other models next page. Powers modern line of diaphragm control valves, and damper operators meet all heating and air conditioning require ments. Simplicity and good design features in Powers FLOWRITE Valves give close control and they last longer. They are available with single seat, double seat, 3 way mixing and V-Port characterized valve which gives straight line control. Accurate control results from smooth rolling diaphragm and minimum of valve stem friction. Diaphragm has formed bead which provides increased sealing action with increasing control pressure. It has no bolt holes. Diaphram lasts longer without replacement. etc TROKE Piston Operators for Dampers, Avattable in S in., 4 in. and 6 in. size. Piston plate assembly has a free float ing thrust plate which absorbs side thrust. Closely guided piston plate maintains valve stem in accurate align ment. Series 844 Bulletins give more facts about these valves. 315