Air in system

[mfgs]

I have a customer who is a bit of a pain to say the least, his most recent complaint was that the new timer I fitted is losing 2 minutes of time over a month (the clock is a little bit slow). Basically I fitted a new boiler for him a few months ago, and there seems to be quite a bit of air collecting in the bathroom radiatior and it needs bleeding on a weekly basis. It has a combined feed and vent, I have never seen problems with this set up pulling in air. I added double the amount of inhibitors required for the size of system aswell. I am struggling to work out where the air is coming from.

 

[mikeygas]

Have you checked all the rad valves and gland nuts for leaks? even small weeps on these will let air in.

 

[diamondgas]

Where is the F&V in conjunction with the pump? Did you flush? Truth now 🙂

Combined f&v is a sealed system so to speak but under atmospheric pressure. if that makes sense..

In my opinion the only way you can get continuing collection in a rad would be through gassing or a small leak on the negative side of the pump drawing in air when the pump is on?

Its always the pain in the posterior custards that you generaly get trouble with, why is that? Grrrr!! LOL

 

[dontknowitall]

If the timer's losing a couple of minutes per month then I'd ask manufacturer for a replacement under warranty. Is there an auto bypass with a gate valve? Maybe it's open too much?

 

[mfgs]

I have checked for leaks on the system, but cant see anything visible.

It had a one full days powerflush. The combined feed and vent is in the correct place, flow comes up the tees off up for the feed and goes horizontal for about a foot and then back down and the pump is positioned on the vertical drop down (if that makes any sense to you)

There is an auto bypass, no gate valve, if thats open too much how would that create air? The timer, I will have to speak to Honeywell about and hopefully get it replaced.

 

[diamondgas]

You can always check to see if its'air' and not 'hydrogen' 🙂 Do you know the method?

 

[stevetheplumber]

there are auto airvents for rads which fit in the normal tapping

 

[mfgs]

You can always check to see if its'air' and not 'hydrogen' 🙂 Do you know the method?

Its something to do with setting the air or hydrogen alight, but I dont really know how to do it or what results to look for.

 

[mfgs]

there are auto airvents for rads which fit in the normal tapping

That could be handy, but I would rather get to the cause of the problem and rectify it as it shouldnt be producing this much air/gas.

 

[diamondgas]

The gas is lighter than air so you hold a cup upside down and let the 'gas' into the cup, strike a match or with a lit lighter place it into the cup. If it's gas you get a small 'pop'

 

[mfgs]

I hope it is a "small pop" and not a big one haha. Thanks for the info, I will give it a go. I hope it is gas so it can be easily sorted with more inhibitors.

 

[diamondgas]

I once heared of someone setting fire to a custards net curtains :rofl:

Usually a pop not a bang 🙂 Can also be accompanies with the smell of cooking cabage!