pipe sizes for complete heating/DHW system

[chris watkins]

Of course what pappasmurf could / should have done in the first place, IMHO, is engaged the services of a CIBSE mechanical consulting engineer who would have sat down with him, talked through all the different options & come up with a design which he would have then owned & it would have been backed by PI insurance in case things went wrong.
He could have then used this design to get heating companies to tender like for like for the work required.
He might not of liked the bill for this service mind you, much easier to walk over the road & have a look at the neighbours place & rely on the local poorly trained plumber or a forum to fill-in the rest.

 

[Gray0689]

Never a truer word spoken chris I agree 100%

 

[pappasmurf]

Then you will need mechanical mixing valves on all manifolds and pumps

Gray0689 which mixing valves are you refering to?... as the underfloor heating manifolds already have automatic mixing valves

 

[Gray0689]

That's the mixing valves I on about

 

[pappasmurf]

Gra0689 please read your reply above! is it a typo?.... i dont understand as i said the "automatic" mixing valves are already installed on the undefloor heating manifolds!... so pls tell me which mixing valve/s u are talking about?

 

[Gray0689]

The ones on manifold
There only attached to manifolds you can get them without
Mate you need to get someone in to help you as your going to get yourself in a muddle as you have a little knowledge and that can be a dangerous mix sometimes
And I mean that in a nice way

 

[on31ll]

i subcontracted for a friend while he got back on his feet ethel austins took him for £175 k ! when the people with the money sorted it they offered him 3p to the pound

 

[vern]

I will keep it brief as you really need someone on site!

Option 3 ......Junk the 24 Ri ,bash in a 40 CDi (actually 41KW) no LLH Commercial spec grunfos pump for primary's say 42mm copper so 11/2" flanged, 4 zone valves (DHW,1 for each UFH Manifold) with autobypass honeywell DU146........5 pumps = 1 x main 1 x bronze secondary 3 already fitted on UFH manifolds, ensure megflo has a balancing valve fiited on return from coil, to obtain 20 deg diff, as 1/1/2" pump will send it through the coil too quickly on DHW mode only, Autobypass will sort the rest, and UFH manfiolds will look after themselves due to mixing valve etc...........
Aww Cr@p book me a hotel!!!!

Heres a crap blackberry picture of a 4 zone system with a 250L Megaflo, with bronze pumped secondary return, it was powered by a 40CDi not in pictures.....this gives you an idea of the room required to install such equipment so be aware of that issue....note these pics were a year on taken on 1 service, note the lagging was supposed to be done by customer as he said why pay us to do a job he could!!

The UFH Manifold was remote mounted under the stairs and just did a 9 zones on the ground floor, second floor was radiators, 1 bathroom and 2 en suites.

lol just seen our sticker peeling from Magnaclean!

 

[Gray0689]

9 branch manifold on 22mm pipe mate!

 

[vern]

9 branch manifold on 22mm pipe mate!

Lol well spotted pal, long story short......small 9 zones e.g downstairs W/C, utility, hall etc, nothing was common'ed up, we did not do the under floor, he contracted it out, also the house was all 1st fixed in hep20 back to the garage, just above where you can see the zone valves, by a plumber who bottled the job and did a runner, luckily he had labeled all the pipes 1st, so 22mm was all we had as all the walls were up and plastered, solid oak skirting etc.....by the time we were involved!

This was a get it finished job and the customer understood we were only liable for the work as the pictures in the garage, this is what happens when you try to save money by employing loads of different contractors on a price! Hence the lagging never got done, in fact 2nd service due anytime so we will see.

BTW the UFH works a treat..... I asked on 1st ASV

 

[Gray0689]

Well nice work either way mate I'm impressed

 

[vern]

by a plumber who bottled the job and did a runner

This was mainly to highlight to the OP what can and, indeed does happen when the jobs a bit out of the ordinary....
One word recommendation, but not his neighbours lol....
The plumbers in question did a runner because.......
1. They were out of their comfort zone
2. They forgot to 1st fix F&R pipes to bathroom, and 2 en suite towel rails, this was not spotted until the floors and walls were all tiled and grouted and suites 2nd fixed! I am talking nice bathroom and en suites too £40K + worth, so how do think said rooms are heated? Yes an above door electric nasty £99 blower!
3. They had just got a stage payment
4. We started mid October and they had to be in for Christmas.....we got done in less than 4 days, including chasing a mate at Northern gas networks to bump up the list his gas service and meter install, but you should have seen the panic as he had completion clauses with clawback for most of the other contractors

 

[Gray0689]

Lol like the sound of the nice blow heaters (NOT) lol

 

[vern]

Lol like the sound of the nice blow heaters (NOT) lol

Looked a treat pal lol, such a shame really but when the customer starts using too many chef's!,

look at our pipework, we would normally use M10 rod with a rail and brass Munson rings, but we had to use the talon clips and spacers, as this is what was there to use! To use the gear up on site and cut costs!

I refused to use the Grundfos 15/50 pump that was on site though..... or I was walking off the job

 

[Gray0689]

Yes prefer school boards and Munson rings myself mate
But plastic o the job
Just depends what they want to pay!!