Building Regulations. An Automatic Bypass Valve (DU) controls water flow in the Heating Circuit according to the water pressure across it and is used to. Discuss Setting Honeywell DU Auto Bypass Valve in the Central I have followed the guides from Honeywell and I have calculated at. The DU automatic bypass and differential pressure valve is used to maintain a constant differential internal threads, DU/4E PDF.

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Last edited by a du154 DU Automatic Bypass Valve DU Automatic bypass and differential pressure valve DU Automatic bypass and differential pressure valve with differential pressure indicator DU M Automatic bypass and differential pressure valve for district heating systems E Automatic air vent EA Automatic air vent with integrated shut-off and leak protection.

Did balancing of the system and realised that a rad one up the line from the rad that got no heat was fully open both TRV and lock shield side. For pump-driven warm water heating systems, e. Posting a message to the forum will remove the above advertisement. No, create an account now. Glow-worm boiler settings help. This site uses cookies.

DU Automatic Bypass Valve – Honeywell UK Heating Controls

You must log in or sign up to reply here. It just takes a bit of time to set it correctly but at 1 it will be open constantly and providing a short circuit. SafeGasInstallMay 18, When the system is operating normally the bypass should be closed.


The DU automatic bypass and differential pressure valve is used to maintain a constant differential pressure in a heating system. Could this be correct? It is there to provide a route for the water to flow through as the system becomes satisfied and shuts down. How will i know if its doing honeywlel it should? Hi What setting have you put the Alpha 2 on, is on auto adapt? Pleased to meet you Tony. If everything is cold boiler fires up and it goes straight through auto bypass tweak it upo again?

Also I had noticed a problem that a rad in utility I would say it was end of the line didn’t even get hot. The boiler return temperature is raised and this reduces corrosion caused by flue gas condensation. Tweaked that and heat from the cold rad. Good afternoon, I’d appreciate a quick bit of help.

Never seen let alone used it Happy btw whats your name? The plumber has left the autopass set below 1 at the lowest point. I had new hot water tank, central heating pump, controls etc.

Honeywell DU145-3/4B 22mm Auto BY-Pass

I did a lot of research into the products I wanted in my system; found a good plumber through people I know that have had work done. Your name or email address: Differential pressure setpoint range.


DU Automatic bypass and differential pressure valve. It reduces flow noise in a system, particularly as thermostatic radiator valves are closed. Nothing much wrong with my thumbs apart from the odd twinge of arthritis: There are a number of products on the market use mainly commercially that will indicate how much water is travelling through a hlneywell, they have a glass window with a spring load wedge that moves along a scale the more water going through the more the wedge moves up the scale, I doubt anyone ever fitting one when the plumber has a thumb.

Yes, my password is: I agree hojeywell will let a hell of a lot of water back into the boiler starving the rads of water. Screw it down fully to start with and as the system is closing down you close it open it up and feel it. As said it is a bit hit or miss and guess work but not hard to do.

honeywll By continuing to use this site, you are agreeing to our use of cookies. Would this push more heat through the rads?? Do you already have an account? I am stan tonyand you are good contribution to the forum Happy.