Job Photo!

[cr0ft]

Is there not a requirement to install a drip tray under the unit?

Not a criticism - just a question

I don't think so mate. If there is I've never seen one done like that. It would make sense to me though as those tundishes can let some water out on full discharge which isn't a design feature I like particularly.

 

[oz-plumber]

We have to install drip tray under internal units, its not so much for the pressure relief valve, it's more so when the cylinder get a leak.

The drip tray is not going to help much if the cylinder bursts, but it will stop some damage to the property when the cylinder get a small leak.

The drip trays have to be drained to a sewer point or directly outside of the property.

As stated - not a criticism , just a question.

Neat and tidy job - well done

 

[Gray0689]

No we don't have to put in drip trays OZ

And yes the black plug is for expands in vessel that's where the flexi goes
But the way it's done is grand

Just one question where is the 2 port valve

 

[cr0ft]

in the garage by the boiler - photo to follow next week once it's all commissioned. Because of the boiler position relative to the airing cupboard it was easier to put the motorised valves, programmer receiver and wiring centre by the boiler. Meant we just had to run one cable through the house for the cylinder thermostat.

Hot water flor and return run separately from the boiler to the cylinder.

 

[Best]

That's a good point about the motorised valve. It has to be beside the unvented cylinder. It is part of the main safety components of the unit & has to be with the unit.
I find that adds work on some jobs, but it has to be done.

 

[Gray0689]

It don't necessarily have to be at cylinder just as long as it's on the coil
I do it a lot like crofts looks better and easier for spark to have all controls together I find

 

[cr0ft]

That's a good point about the motorised valve. It has to be beside the unvented cylinder. It is part of the main safety components of the unit & has to be with the unit.
I find that adds work on some jobs, but it has to be done.

Interesting. Can you show me whereit says that in the regs as that's not something I was aware of.

 

[Chalked]

That's a good point about the motorised valve. It has to be beside the unvented cylinder. It is part of the main safety components of the unit & has to be with the unit.
I find that adds work on some jobs, but it has to be done.

It dosnt have to be fitted beside the cylinder, as long as it is fitted on the primaries. It's neater sometimes to keep all the motorised valves together ( make sure they are marked up)
There are no regs to my knowledge that say you can or can't do this. It just says a two port valve must be fitted to the primary pipe work.

 

[Atouchofgas]

I would have thought that so long as the cylinder cutout and hw valve are wired together it shouldn't matter where the zone valve is positioned ( obviously on an s plan )

 

[stevetheplumber]

The comment from oz plumber reminds me how our standards have dropped as an apprentice 40 years ago we often found baths with drip pans made of lead usually piped to outside like an overflow warning pipe being good British tradesmen we thought this was such a good idea we ripped them out and weighed them in

 

[stevetheplumber]

By the way the job is pukka croft and ive not seen. Anything to say where the MV has to be positioned. Only fault is it might make fault finding a bit harder in future

 

[Gray0689]

The comment from oz plumber reminds me how our standards have dropped as an apprentice 40 years ago we often found baths with drip pans made of lead usually piped to outside like an overflow warning pipe being good British tradesmen we thought this was such a good idea we ripped them out and weighed them in

That just makes me think you had a lot of leaks lol

 

[Best]

Interesting. Can you show me whereit says that in the regs as that's not something I was aware of.

I believe some manufacturers MIs I read said the motorised valve supplied with the unit must be fitted close to unit. This would override other regs if stated.
It is obviously a major safety control, cutting heat off which is the real danger with unvented & I can see the point of it being as part of the group of controls within the unvented units area and not remotely fitted. Better to for anyone servicing the unit so they can check the valve. Is a pain though must admit to have it wired.
Problem I see with a remotely fitted unvented mv is that high likelihood of a heating circuit failing in a home and the people tampering with the wrong motorised valve near their boiler, for example and locking the valve into manual position.

 

[voivod]

The comment from oz plumber reminds me how our standards have dropped as an apprentice 40 years ago we often found baths with drip pans made of lead usually piped to outside like an overflow warning pipe being good British tradesmen we thought this was such a good idea we ripped them out and weighed them in

done them under washing machines in stately homes/castles when was apprentice....was an insurance company requirement .