Ask The Trades - Print Page

Ask The Trades
https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> condensing combi system https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1168892759 Message started by dj-paul-c on Jan 15^th, 2007, 8:25pm

Title: condensing combi system
Post by dj-paul-c on Jan 15^th, 2007, 8:25pm

getting a condensing combi fitted soon,

do they still put 8mm microbore pipe in with a condensing combi into an end feed manifold or do they have to use 15mm pipe throught

do you still have to use one radiator as a heat loss or is there a bypass built into the boiler,

the boiler im thinking of getting installed is the vokera syntesi 29he

thanks for the help
paul

Title: Re: condensing combi system
Post by thescruff on Jan 15^th, 2007, 10:11pm

The Syntesi is discontinude.

The Unica/Minute HE is the replacment.

http://www.vokera.co.uk for the installation guide.

Title: Re: condensing combi system
Post by thescruff on Jan 15^th, 2007, 10:20pm

Microbore I wouldn't give it the light of day, as much rubbish now as it's always been, ok so you could install a Magnaclean which would help, in fact fit one anyway, best thing since sliced bread for modern bean cans (boilers)

By-pass depends on the system, but is included in the Unica HE.

Title: Re: condensing combi system
Post by david64 on Jan 17^th, 2007, 12:57pm

Sorry to jump in but I see that you are recommending the Magnaclean: In this instance are you recommending it specifically because of the use of plastic pipes? If so, could you explain why?

I'am intrested as at work we are dealing with some iron oxide related issues on a heating system at the moment and I wondered if the product may help. The system we have been working on is plumbed with unbarriered plastic pipes. Unmongst other things the system was converted to a pressurized system as this was supposed to prevent air entering it via the pipe walls but unfortunately some 18months later the problems seem to be re-appearing. The general feeling now is that plastic pipework is going to have to be replaced with copper.

Obviously this is going to cost lot of money so I just wondered if the Magnaclean might be of benefit here.

Title: Re: condensing combi system
Post by thescruff on Jan 17^th, 2007, 7:43pm

I didn't reccommend the magnaclean becuse of the plastic but because they are good on any system.

To answer your question they would clean the system but not stop the problem.

I assume by your post you are suffering from pinhole corrosion.

Has the system been filled with Fernox inhibitor, where is the system (area) and the size of.

If you have a sparky person hanging around get him to stick a clamp meter on all the pipes, Gas, Water, Rad tails and the main earth wire.

He would be looking for low amps, typically 20-45, No Volts, and post the results.