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No doesn't sound like it, is it the terminal you are on about or an actual bend? post a pic if you can Matt

The only time I ever see gauges installed on expansion vessels (and that's rarely)are on commercial installs, but it shows system pressure anyway not precharge,don't worry about it Matt

I knew it you little tinker you :mrgreen: funny enough was going to mention the fact that we have plenty p/s systems over here that don't use a cst or llh arrangement, was at one yesterday, will go through my pics and post a couple when I get back in if any are good enough Matt

you also get handy pockets for temp sensors :D but to be fair to steel a LLH is a better choice is you have got the dosh He's confusing the issue, absolutely no baring on the Ops system whatsoever, he will be getting onto underslung,overslung and tertiary loops next Nothing mate apart...

absolutely for instance the existing 15-60 may be rated up 6 metres of head but it would still be no good to use as a primary pump due to its quoted flowrate at 4m of head. look at DH's diagram, the point is to stop flow in circuits you don't want on Rubbish, discounting the...

As said that's a normal standard It's you that should have been doing the asking I'm afraid Matt

Your theory is wrong mate Much more likely there is a restriction/ blockage in the pipe or you don't have the correct precharge in it. It would have been easier just to have plumbed it into the boiler return as per steels post above how have you routed the flexi out of the boiler, are you...

The primary pump only needs to be sized for the primary loop dave So it would be sized for req flowrate against a head loss of 4.05 m + the primary loop resistance ( the system losses are only relevant to the secondary pump) so the magma 25-80 would likely be overkill By the way I did find an...

I know, we do go on :mrgreen: :mrgreen:

I knew you would get it before I finished writing :lol: that ones easier to to answer because it is always more desirable the boiler on a primary and hydraulic separation between circuits,means you have more control, on large systems its the only way anyway its the same with chiller...

Well since you asked nicely I will explain Let us say that the op decides to go for hydraulic separation between the boiler and the system and installs a LLH He finds that by pure chance the spacing between the flow and return is such that all he has to do is cut out 2 sections of pipe and...

I despair :roll: anyway have fun Steel now where were we? Oh yes Op ya pumps are nee good Mate

Oh I think I'll get by :wink: Matt Ps what you have overlooked is hinted at in my post before this one

Steel I am well aware of the influence of gravity circulation mate, and of hydraulic seperation and I also know that zone valves are not req if the secondary circuit consists of one heating load I also know that if your secondary circuit is split into more than one load then they are...

you edited that quick :wink: btw the flapper is a non return valve, it prevents recirculation via the other pump I'm not nit picking like :twisted: Matt

but it doesn't mean they cant be used ie 1 primary loop and one pump 1 secondary loop and one pump secondary loop split into two zones each controlled by a zone valve Matt

I see far more P/s arrangements using closely spaced tees than using LLH's to be honest doubt he would need any NRV's Not that I am saying a LLh isn't a good option btw it just isn't the only or cheapest option The P/S route is undoubtedly the best route either option Matt