Need Help with Mid posn plus two port valve Unvented System.

[thefibreguy]

Guys,

Please be gentle, I only qualified 5 weeks ago

Have been asked by a friend to sort out an issue with his system.

He has an unvented system, with a mid position, & a 2 port valve. He has only been in the house 3 weeks, & can only get hot water when heating called for. Both valves operate, but I think Stevie Wonder wired it, with Jodie Marsh reading the instructions!!!, its all over the place.

Before I dive-in, has anyone a diagram to use as a ref. I can find diagrams for the individual valves, buy non when used together. Valves are Honeywell.

Any help please.

Regards

 

[doitall]

What do they do for starters, is one on an unvented cylinder.

 

[glasgowgas]

the 2 port is wired in series to control stat-hi limit stat

mid position is wired thru wiring centre to command boiler after signal from programmer

uv make/model?
boiler make/model?
mid pos v/v make/model?

 

[kevplumb]

so its a "y" plan with a 2 port on the cylinder

 

[picasso]

scroll down to "y" plan, but make sure this is compatable with whatever is installed on the job your working on.

http://www.osohotwater.com/uk/pdf/Super_S_installation_manual.pdf

 

[assured heating]

If you have not got you're unvented ticket (G3) you should not be touching it

The 2 port is a safety device but you should already know that !!

 

[ChrisR]

Unfortunately there's nothing in the G3 assessment about exactly how to wire it!

It's always in the Cyl Inst instrs though.......

 

[fitz1]

check that there is a permanent live from the clock to the wireing center.

 

[picasso]

check that there is a permanent live from the clock to the wireing center.

 

[thefibreguy]

I know the 2 port is a safety device, I just wanted a wiring diagram.

I do not have a G3, but I have completed my Construction Skills UHWSS Install, Commission, & Servive, as well as my Water Supply(Water Fittings) Regs 1999. I also have my ACS for:

Combustion Performance Analysis
Domestic Natural Gas Safety
Gas Cookers
Gas Fires, & Heaters
Inst Water Heaters
Central Heating Boilers <70kw
Domestic Gas Meters.........& whilst we are on the subject of tickets:

Energy Efficiency for Domestic Heating
Essential Electrics
Combi-B Basic F Finding
Combi-B Advanced F Finding
Part P (Basic)

Guess that means I have the tickets !!

My Gas Safe ticket is waiting for me, I just want another months experience.
I am currently working alongside a Gas Safe engineer with 25 years experience (unpaid - my choice). He has not seen the job yet, I just want him to see that I am working 'off the job' to gather info. After every job, I revert to my text books, & notes. In 5 years, I want to be a good heating engineer, not one that gets by, by ripping off people, like so many out there!!.

If it would not have been for this family friend helping me, I would have ended up like many others, working for peanuts thru an agency, blagging it all the way!!. I have found out that this industry is no different from the rest, its not what you know, but who you know!!.

 

[kevplumb]

I do not have a G3

shouldnt be messing then

and no im not jumping on the bandwagon

 

[picasso]

what is a uhwss if it aint a g3 ticket

 

[thefibreguy]

In my hand, I have a Construction Skills Building Engineering Services 'WATER' card.

On the back, its states Catergory - UHWSS Install, Commission & service. It also states Water Supply (Water Fittings) Regs 1999. It expires 08/07/2014.

UHWSS - Unvented Hot Water Storage System. Well it was the last time I checked!!

 

[kevplumb]

well then g3

i withdraw my previous comment

 

[thefibreguy]

well then g3

i withdraw my previous comment

I did not know it was known as a G3, like so many other things, terminology changes!! Sorry.