2 Port & 3 Port valve /How do I wire??

[Delboy]

Hi guys I’m new to all of this, any help will be appreciated. I was called out to a job at work today, The system was a pressurised system. The tank was a "ergo" (cheaper version of a Megaflow) tried calling the company, they seem to be nonexistent now. The boiler in the property is a “Baxi Barcelona”.

Whoever did the installation used a Honeywell 3 Port valve…. On the hot water side of the 3 Port valve they have also installed a Honeywell 2 Port valve, with all the wiring ie: valves, pump, stat etc all going into a wiring center.


My problem is that I ‘m not one hundred percent sure how to wire a system that consists of a 2 Port and a 3 port together… I’d be fine I’d it was a normal 3 Port system or two separate 2 Port valves… any help, explanations or directions to websites would be appreciated…
Thanks guys😕

 

[mikegas]

What is the fault?

 

[tipintim]

If you can do 3 port/2port you are ok. The only diff is that you will have 2 stats for heating, as it is zoned???

 

[tipintim]

Just re-read post. I think 2 port valve is not needed. Can you post photo?

 

[mikegas]

Ive not done my unvented yet but i think the 2 port is linked to the overheat stat to cut the supply should the cylinder overheat so i wouldnt touch it if your not sure

 

[ecowarm]

Just re-read post. I think 2 port valve is not needed. Can you post photo?

The two port valve is needed,,,,, part of G3 building regs

 

[Delboy]

Mikegas.... I dont think there is a fault with the wiring, the initial problem has been solved.... my issue is that I have never been showed how to wire a system like this, I'm trying to work it out to help me in the future incase I come across this again..
Thanls..

 

[ecowarm]

Look here page 6 of 16 http://www.albionwaterheaters.com/pdfs/technical/ultrasteel.pdf not the same make but will give an idea of whats involved

Eco

 

[mikeygas]

The 2 port valve is the energy cut off (eco) and is a safety feature which is always incorporated when wiring up a "y" plan (3 port valve) unvented cylinder system. You need to have your G3 unvented ticket to play about with these. If you do the course it's explained there.

 

[Delboy]

Thanks ecowarm that is exactly what I was looking for... you hit the nail on the head.... Thank you to all the other engineers.. youve been a great help!!!