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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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. When the system is operating normally the bypass should be closed. 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.

How will i know if its doing what it should?

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.

I agree 1 will let a hell of a lot of water back into the hnoeywell starving the rads of water. If everything is cold boiler fires up and it goes straight through auto bypass tweak it upo again?

DU Automatic bypass and differential pressure valve. By du45 to use this site, you are agreeing to our use of cookies. I’d appreciate some guidance. As said it is a bit hit or miss and guess work but not hard to do.


For pump-driven warm water heating systems, e. The boiler return temperature is raised and this reduces corrosion caused by flue gas condensation.

Honeywell DU145 Angled Automatic Bypass Valve 22mm

Differential pressure setpoint range. SafeGasInstallMay 18, It is there to provide a route for the water to flow through as the system becomes satisfied and shuts down. I had new hot water tank, central heating pump, controls etc. Users found this page by searching for: Never seen let alone used it Happy btw whats your name?

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.

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 compensation controls. Posting a message to the forum will remove the above advertisement.

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? Do you already have an account? The DU automatic bypass and differential pressure valve is used to maintain a constant differential pressure in a heating system. It reduces flow noise in a system, particularly as thermostatic radiator valves are closed. No, create an account now. Pleased to meet you Tony. 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.

In the meantime I have realised that as soon as the hot water starts pumping it goes down the bypass straight away. I assume this cannot be correct, I have followed the guides from Honeywell and I have calculated at between 3 – 4? Nothing much wrong with my thumbs apart from the odd twinge of arthritis: Discussion in ‘ Central Heating Forum ‘ started by antsalsMay 18, 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 Thursday re-filled system fired it up Good afternoon, I’d appreciate a quick bit of help.


Honeywell – DU By Pass Valve – Advanced Water Company

Brass housing and fittings, plastic sping bonnet assembly and valve disc, stainless steel spring, EPDM seals. Tweaked that and heat from the cold rad. Would this push more heat through the rads?? There are a honeydell of products on the market use mainly commercially that will indicate how much water is travelling through a pipe, 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.

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. It just takes a bit of time to set it correctly but at 1 it will be open constantly and providing a short circuit.

DU Automatic bypass and differential pressure valve

Screw it down fully to start with and as the system is closing down you close it open it up and feel it. Checkout our Plumbers Insurance area – heavily discounted Public Liability Insurance and Van Insurance specifically designed for plumbers. This site uses cookies.