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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Checkout our Plumbers Insurance area – heavily discounted Public Liability Insurance and Van Insurance specifically designed for plumbers. Discussion in ‘ Central Heating Forum ‘ started by antsalsMay 18, honehwell Posting a message to the forum will remove the above advertisement.

This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Good afternoon, I’d appreciate a quick bit of help. I had new hot water tank, central heating pump, controls etc. 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.

Honeywell DU Bypass Vale Angled, Heating, Heating Controls, Bypass Valves

I’m an engineer by trade and have read up on every product possible, but trying to learn on how systems should be set to get optimum I moved and installed new rad on Hooneywell re-filled system fired it up 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.

I was unsure if it was since the upgrade of CH or always been like that cause we have only been in the house for a year. 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.


Tweaked that and heat from the cold rad. In the meantime I have realised that as soon as the hot water starts pumping it goes down the bypass straight away.

Honeywell Auto By-Pass Valve – DU/4B, Honeywell Wiring Centre – –

The plumber has left the autopass set below 1 at the lowest point. I dy145 this cannot be correct, I have followed the guides from Honeywell and I have calculated at between 3 – 4? Could this be correct?

Would this push more heat through the rads?? I’d appreciate some guidance. The more the auto bypass is screwed down the more water goes through the system the less goes through the bypass, adjust it a bit at at time, Ant.

When the system is operating normally the bypass should be closed. It is there to provide a route for the water to flow through as the system joneywell satisfied and shuts down. It just takes a bit of time to set it correctly but at 1 it will be open constantly and providing a short circuit.

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

I don’t know how anyone can really set up a auto bypass valve its a bit rule of thumb without the thumb, the boiler will need a flow through it when thermo rad valves close down or inline zone valves, it is really impossible to know how much water is going through the system and how much through the bypass loop. There are a number of products on hondywell market use mainly commercially that will indicate how much water is travelling through a pipe, they have a d1u45 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.


I agree 1 will let a hell of a lot of water back into the boiler starving the rads of water. Last edited by a moderator: Never seen let alone used it Happy btw whats your name? Nothing much wrong with my thumbs apart from the odd twinge of arthritis: Pleased to meet you Tony.

So is a bit of suck it and see How will i know if its doing what it should? If everything is cold boiler fires up and it goes straight through auto bypass tweak it upo again? 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. SafeGasInstallMay 18, I am stan tonyand you are good contribution to the forum Happy. Hi What setting have you put the Alpha 2 on, is on auto adapt?

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Yes, my password is: Glow-worm boiler settings help.

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