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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Honeywell Copyright Privacy Statement Imprint. In the meantime I have realised that as soon as the hot water starts pumping it goes down the bypass straight away. When the system is operating normally the bypass should be closed. Glow-worm boiler settings help. You must log in or sign up hpneywell reply here.

For pump-driven warm water heating systems, e. Did balancing of the system yoneywell realised that a rad one up the line from the rad that got no heat was fully open both TRV and lock shield side.

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

I had new hot water tank, central heating pump, controls etc. Differential pressure setpoint range. Brass housing and fittings, plastic sping bonnet assembly and valve disc, stainless steel spring, EPDM seals.

As said it is a bit hit honeywlel miss and guess work but not hard to do. 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. 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 honeeywell going through the system and how much through the bypass loop.

Yes, my password is: Users found this page by searching for: Never seen let alone used it Happy btw whats your name? I agree 1 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. Tweaked that and heat from the cold rad. Do you already have an account? SafeGasInstallMay 18, Posting a message to the forum will remove the above advertisement. No, create an account now.


Pleased to meet you Tony. Could this be correct? Last edited by a moderator: I assume this cannot be correct, I have followed the guides from Honeywell and I have calculated at between 3 – 4? Good afternoon, I’d appreciate a quick bit of help.

I am stan tonyand you are good contribution to the forum Happy. 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. Would this push more heat through the rads??

I’d appreciate some guidance. 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.

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It reduces flow noise in a system, particularly as thermostatic radiator valves are closed. How will i know if its doing what it should?

Checkout our Plumbers Insurance area – heavily discounted Public Liability Insurance and Van Insurance specifically designed for plumbers. Discussion in ‘ Central Heating Forum ‘ started by antsals honeywell, May 18, The DU automatic bypass and differential pressure valve is used to maintain a constant differential pressure in a heating system.

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.

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.


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

Hi What setting have you put the Alpha 2 on, is on auto adapt? Your name or email address: The boiler return temperature is raised and this reduces corrosion caused by flue gas condensation.

The plumber has left the autopass set below 1 at the lowest point. On gas-fired water heaters it guarantees a minimum flow circulation when thermostats or radiator valves are closed. Nothing much wrong with my thumbs apart from the odd twinge of arthritis: 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.

DU Automatic bypass and differential pressure valve

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 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’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 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.

So is a bit of suck it and see By continuing to use this site, you are agreeing to our use of cookies. It is there to provide a route for the water to flow through as the system becomes satisfied and shuts down.