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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Screw it down fully to start with and as the system is closing down you close it open it up and feel it. Posting a message to the forum will remove the above advertisement. It just takes a bit of time to set it correctly but at 1 it will be open constantly and providing a short circuit. I assume this cannot be correct, I have followed the guides from Honeywell and I have calculated at between du1455 – 4?

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. Could this dj145 correct? For pump-driven warm water heating systems, e.

If everything is cold boiler fires up and it goes straight through auto bypass tweak it upo again?

Last edited by a moderator: I did a lot of research into the products I wanted in my system; dy145 a good plumber through people I know that have had work done. Hi What setting have you put the Alpha 2 on, is on auto adapt?


Nothing much wrong with my thumbs apart from the odd twinge of arthritis: Differential pressure setpoint range.

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 boiler starving the rads of water. Yes, my password is: The boiler return temperature is raised and this reduces corrosion caused by flue gas condensation.

It reduces flow noise in a system, particularly as thermostatic radiator valves are closed.

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

Do you already have an account? Pleased to meet you Tony. On gas-fired water heaters it guarantees a minimum flow circulation when thermostats or radiator valves are closed.

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. Checkout our Honeysell Insurance area – heavily discounted Public Liability Insurance and Van Insurance specifically designed for plumbers.

MK by Honeywell DU/4B | Honeywell Angled Automatic Bypass Valve

So is a bit of suck it and see I’d appreciate uoneywell guidance. Glow-worm boiler settings help. You must log in or sign up to reply here. In the meantime I have realised that as soon as the hot water starts pumping it goes down the bypass straight away.


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. Discussion in ‘ Central Heating Forum ‘ started by antsalsMay 18, This site uses cookies.

Users found this page by searching for: Brass housing and fittings, plastic sping bonnet assembly and valve disc, stainless steel spring, EPDM seals. DU Automatic bypass and differential pressure valve. As said it is a honeuwell hit or miss and guess work but not hard to do.

Honeywell DU145 Angled Automatic Bypass Valve 22mm

How will i know if its doing what it should? 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 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.

No, create an account now.