Hi group,
quick question - How exactly should a filling point (i.e. to add cleanser or inhibitor) look like in a closed pressurized central heating system ?
Reading previous posts I see that some people use fancy bathroom radiators for that, but assuming you don't have one ... Probably valves at both ends of such thing but what construction in between them ? (I assume you need to drain that part and then add your chemical)
thanks for your help
Dunno. Mines a hose on the boiler. Looks lie a washing machine hose and its connected by a tap to incoming mains.
Needs a top up once a year generally.
Nah - that's a filling loop. What I'm after is a point where you can add chemicals to your system (like inhibitor), so you dont have to do it via radiators and syringe.
That's not what most people would call a filling point (which on a sealed system is a combination of tap, hose, and non return valve used for getting the water into the system from the cold main).
Any radiator will do. Shut both valves[1], undo the coupling nut and drain a litre or so from the rad. Remove the blanking plug at the top and squirt / pour inhibitor into the rad. Open the valves again. Once the system has been running for a little while bleed the rad of any remaining air.
[1] count the turns required to shut the lockshield valve so that you can restore the previous position on reopening.
Oh. I haven't got one.
I always assumed you took the top of the towel rail and just poured it in..after depressurising...
ah, sorry I am not a native speaker ...
thanks for that - doesn't look too complicated to bother with separate "chemical adding point" =)
yup - will do, not to lose the balance in the system
See post a couple or three back todays date.
The advantage of using a towel rail if you have one, is that some have the blanking plug on top facing up - which makes pouring inhibitor in a little easier. For pouring it into the side plug of a radiator I just use a funnel stuffed into the end of a short bit of plastic pipe, the other end of which is poked into the plug hole in the rad.
Sentinel x100 (about a tenner on EBay) comes with a flexible spout. Contains about 50 pence worth of boric acid with detergent, but what the hell, I don't envisage doing it very often.
Most people use a towel rail if they have one.
I tried feeding inhibitor through a normal radiator (standard liquid form, not the concentrate) failed miserably, so I've not got a t-joint and upwards facing washing machine valve.
Ben
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