Light Commercial Boiler Reviews

[Ermintrude]

Agreed with elderly baldy.

 

[tm plumbing]

Just realised doing 4 zones of LLH isn't possible as all heating need to go through plate so 2 it is.

 

[Pipes Plumbing]

Try VA heating for a LLH on 01782 845633.
Used them a fair few times for LLHs made to spec. Do the sizing, give them a drawing and away they go. Good value too!

 

[tm plumbing]

Try VA heating for a LLH on 01782 845633.
Used them a fair few times for LLHs made to spec. Do the sizing, give them a drawing and away they go. Good value too!

Yes thanks I'm waiting on a cost from them, hopefully tomorrow.
I'm also going to strip out the 3 large commercial zone valves on this system & replace them with 3 28mm Honeywell with a separate pump for each leg. Think this will pull better balance from the LLH
A bit more in this than I first thought but if it's worth doing its worth doing right IMO

 

[Ermintrude]

Don't forget balancing valves on returns

 

[tm plumbing]

Don't forget balancing valves on returns

Yip that means more big bore iron out the plant room, can't be a bad thing.
double regulating valves yeh

 

[Ermintrude]

Yep sure is .

 

[happyflyer]

Will you guys tell me how you intend to set up the DRVs please I would love to know, hold th'and onto F/R,

Gate valves have served us well on domestic for the last 60 years, why all of a sudden is UPK going commercial using DRV, WB went a bit over-board on their LLH drawing me thinks.

 

[Ermintrude]

U be using my "sonex" ultra sonic mass flow rate calculator coupled with my hot tube differential gauge.

 

[Ermintrude]

Will you guys tell me how you intend to set up the DRVs please I would love to know, hold th'and onto F/R,

Gate valves have served us well on domestic for the last 60 years, why all of a sudden is UPK going commercial using DRV, WB went a bit over-board on their LLH drawing me thinks.

I've got to go back a replace. 5 28mm altech gate valves on a school used for balancing the gland nuts don't thread on properly and it looks a mess as they are weeping when hot

 

[happyflyer]

I've got to go back a replace. 5 28mm altech gate valves on a school used for balancing the gland nuts don't thread on properly and it looks a mess as they are weeping when hot

Photos please Ermi, I can't upload any photos any more just get URL link only what am I doing wrong?

 

[doitmyself]

I can't upload any photos any more just get URL link only what am I doing wrong?

Nothing. It's a system-wide problem. Someone has turned off "add attachments". It's been reported but, so far, nothing has benn done about it.

 

[happyflyer]

Nothing. It's a system-wide problem. Someone has turned off "add attachments". It's been reported but, so far, nothing has benn done about it.

thanks doit thought it was me

 

[tm plumbing]

it's been a while since this job so thought i'd update -
The sealed side with the LLH is working fine, on the OV side there's 3 heating zones, the largest of which is dying on me when the other 2 are on at same time they are each served with a 15/60 so it's off with zone 1 pump tomorrow and in goes a Ups2 32-80 so i'm hoping with a bit of balncing i'll get even distribution. i'll update how it goes

 

[PhoenixServices]

Nice and neat, personally would of used lever valves (although supposes it depends on budget) . Also why are the pumps in the first picture facing up? Thought that was bad for them.

 

[tm plumbing]

I don't mind the gate valves to be honest can be useful to help balance.
also the pumps are ok as long as the shaft is either horizontal or slightly higher to eliminate air ( according to Grundfos PDFs anyway) see below -

The new pump works better but the manifold pipe work setup I have is no good so back tomorrow to re do a bit of pipework and have the three heating zones teed off the HX horizontal flow outlet direct up into each zone valve with a new valve on each to adjust flows. Picking up the expansion too.
At the moment it only wants to flow on 1st zone only due to pipework, altering it should hopefully be more even. Fingers crossed !!

Where pumps are installed in horizontal pipework, ensure that the pump shaft is also horizontalor slightly higher at the vent plug end. This reduces thrust bearing load and ensures positive airpurging from both the rotor chamber and impeller housing.