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Detailed instructions for use are in the User's Guide.
[. . . ] en
er g y saving
DU144
Automatic Bypass Valve
www. energysavingtrust. org. uk
INSTALLATION INSTRUCTIONS
Building Regulations
An Automatic Bypass Valve (DU144) controls water flow in the Heating Circuit according to the water pressure across it and is used to maintain a minimum flow rate through the boiler and to limit circulation pressure when other water paths are closed. [. . . ] Do not over tighten.
Setting Procedure
1) Commission and balance the Heating System take note of the selected pump speed. 2) Using the Boiler manufacturer's instructions, find the minimum flow requirement for the Boiler. 3) Using the Pump manufacturer`s Pump curves determine the available Pump head when operating at the required minimum flow and the selected Pump speed. 4) Using the DU144 Setting chart, the calculated Pump Head and the minimum Boiler Flow to find the optimum setting for the DU144 Note: To set the DU144, remove the protective cap and turn the setting handle until the bottom of the handle crosses the corresponding line on the DU144 stem. Note: The cap is internally fixed with sealing wax during assembly. Should persistent water velocity noise occur in the Heating System, gradually turn the DU144 to a lower setting until the noise is eliminated. Important: replace protective cap after setting the DU144 to avoid tampering
Example: Minimum flow 300 l/h - Pump speed 3. Pump chart indicates 4 m head (Use Pump Manufactures chart).
Pump Head 3) Available head (example 4m) 5m 4m 3m 2m 1m Flow l/h 2) 300 l/h Boiler min. [. . . ] Subject to change · All rights reserved
Manufactured for and on behalf of the Environment and Combustion Controls Division of Honeywell Technologies Sàrl, Ecublens, Route du Bois 37, Switzerland by its Authorised Representative Honeywell GmbH [. . . ]
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