User manual HONEYWELL DU146M

[. . . ] DU146 M AUTOMATIC BYPASS AND DIFFERENTIAL PRESSURE VALVE FOR INSTALLATION IN DISTRICT HEATING SYSTEMS PRODUCT DATA Application The DU146 M automatic bypass and differential pressure valve is used to maintain constant differential pressure in a heating system. [. . . ] In addition, when radiator valves are closed it also maintains flow over the temperature sensor on the boiler to ensure proper operation of external temperature compensating controls. On gas fired water heaters it guarantees a minimum flow circulation when thermostats or radiator valves are closed. Features · Simple installation between the flow and return pipework · Minimises flow noise · No external controls required · Differential pressure finely adjustable · Problemlose Einregulierung durch eingebaute Differenzdruck-Istwertanzeige · Hinders boiler corrosion · Setting value is in meters water column Design The automatic bypass and differential pressure valve comprises: · Body with internally threaded inlet and outlet · Spring bonnet · Adjustment facility · Valve disc · Spring · Tried and tested Range of Application For pumped hot water heating systems Specifications Medium Operating temperature Operating pressure Differential pressure Hot water max. 16 bar (232 P. S. I. ) Adjustable between 0, 05. . . 0, 5 bar (0, 7. . . 7, 3 P. S. I. ) Set during manufacture at 0, 2 bar (2, 9 P. S. I. ) Connection size 3/4" and 1 1/4" Materials · Unpolished brass housing · Untreated brass spring bonnet · High-quality synthetic material adjuster knob · Brass valve disc · Stainless-steel spring · EPDM seals Copyright © 2001 Honeywell AG · All rights reserved EN0H-182GE25 R0301 DU146 M Function At equal pressure between the inlet and outlet side the valve is closed. The valve disc is pushed by a spring against the valve seat. If there is a pressure difference between the inlet and outlet sides, then a force is exerted on the valve disc and against the spring. If this force exceeds the force of the spring, then the valve begins to open in proportion to the rise in differential pressure and maintains a constant bypass flow as indicated on the flow diagram. Versions A = Standard version Special version on request Type R L 3/4" 1 1/4" 36 51 I Dimensions H 160 213 h 100 155 50 58 . 3 Flow rate V m /h 3 10 Ordering-No. [. . . ] DU146 M valves are specifically designed for district heating schemes, but they can also be used for heating installations with three and four way mixer valves, for example on gas fired hot water circulation systems Flow Diagram Turns Honeywell AG · All rights reserved 3 EN0H-182GE25 R0301 DU146 M Home and Building Control Honeywell AG Zu den Ruhrwiesen 3 D-59755 Arnsberg-Neheim EN0H-182GE25 R0301 Phone: (49) 2932 9880 Fax: (49) 2932 988239 mng@honeywell. com 4 http://europe. hbc. honeywell. com Subject to change · All rights reserved [. . . ]