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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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. It reduces flow noise in a system, particularly as thermostatic radiator valves are closed. Discussion in ‘ Central Heating Forum ‘ started by antsalsMay 18, I had new hot water tank, central heating pump, controls etc.

Screw it down fully to start with and as the system is closing down you close it open it up and feel it. I agree 1 will let a hell of a lot of water back into the boiler starving the rads of water. Checkout our Plumbers Insurance area – heavily discounted Public Liability Insurance and Van Insurance specifically designed for plumbers.

Last edited by a moderator: Do you already have an account? Tweaked that and heat from the cold rad.

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

In the meantime I have realised that as soon as the hot water starts pumping it goes down the bypass straight away. 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.


On gas-fired water heaters it guarantees a minimum flow circulation when thermostats or radiator valves are closed. The plumber has left the autopass set below 1 at the lowest point.

Glow-worm boiler settings help. If everything is cold boiler fires up and it goes straight through auto bypass tweak it upo again? DU Automatic bypass and honeywelll pressure valve. This site uses cookies. 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 ddu145 zone valves, it is really impossible to know how much water is going through the system and how much through the bypass loop.

Pleased to meet you Tony.

Yes, my password is: Your name or email address: Hi What setting have you put the Alpha 2 on, is on auto adapt? I was unsure if it uoneywell since the upgrade of CH or always been like that cause we have only been in the house for a year.

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. The DU automatic bypass and differential pressure valve is used to maintain a constant differential pressure in a heating system.

Honeywell DU145 Angled Automatic Bypass Valve 22mm

I assume this cannot be correct, I have followed the guides from Honeywell and I have calculated at between 3 – 4? As said it is a bit hit or miss and guess work but not hard to do.

By continuing to use this site, you are agreeing to our use of cookies. Honeywll the system is operating normally the bypass should be closed.


Honeywell DU Angled Automatic Bypass Valve 22mm | eBay

honeyewll I’d appreciate some guidance. 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. Posting a message to the forum will remove the above advertisement. Good afternoon, I’d appreciate a quick bit of help. It is there to provide a route for the water to flow through as the system becomes satisfied and shuts down.

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 honwywell heating systems E Automatic air vent EA Automatic air vent with integrated shut-off and leak protection.

Nothing much wrong with my thumbs apart from the odd twinge of arthritis: 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.

Brass housing and fittings, plastic sping bonnet assembly and valve disc, stainless steel spring, EPDM seals. Could this be correct?

So is a bit of suck it and see There are a number 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 honeywelll 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.