User manual HONEYWELL DU146

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Manual abstract: user guide HONEYWELL DU146

Detailed instructions for use are in the User's Guide.

 [. . . ] DU146
AUTOMATIC BYPASS AND DIFFERENTIAL PRESSURE VALVE WITH DIFFERENTIAL PRESSURE INDICATOR
PRODUCT DATA

Application
The DU146 automatic bypass and differential pressure valve is used to maintain constant differential pressure in a heating system.  [. . . ] 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 · Simple adjustment using the integral differential pressure indicator · Hinders boiler corrosion · Setting value is in meters water column

Design
The bypass and differential pressure valve comprises: · Body with internally threaded inlet and outlet · Spring bonnet · Display tube for differential pressure indication · 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. 3, 0 bar (43, 5 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 · High-grade synthetic material spring bonnet · High-temperature resistant synthetic material display tube · High-quality synthetic material adjuster knob · Brass valve disc · Stainless-steel spring · EPDM seals

Copyright © 2002 Honeywell AG · All rights reserved

EN0H-0181GE25 R0402

DU146

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 versions on request

Type R L 3/4" 1 1/4" 36 51 I

Dimensions H 160 213 h 100 155 50 58

for installations 90/70 up to ca. DU146-3/4 A DU146-1 1/4 A

Accessories
Complete indicator tube For DU146 differential pressure and bypass valve.  [. . . ] DU 146 can be installed: · On heating systems with three-way mixer valves · On heating systems with four-way mixer valves · On gas-fired hot water circulation heating systems

Flow Diagrams
Turns

Honeywell AG · All rights reserved

3

EN0H-0181GE25 R0402

DU146

Home and Building Control Honeywell AG Zu den Ruhrwiesen 3 D-59755 Arnsberg-Neheim
EN0H-0181GE25 R0402

Phone: (49) 2932 9880 Fax: (49) 2932 988239 mng@honeywell. com
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http://europe. hbc. honeywell. com
Subject to change · All rights reserved [. . . ]

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