when i bleed my radiators with the pump running the radiators actually
suck air in. I have been told that it may be my pump running to fast
so have just checked the speed and yes it was on set to 3 I have set
it to 1 but I still cant bleed them but it does not sound like the air
is getting sucked in.
any ideas the pump is a myson sd53 and the boiler is a baxi back
boiler type. i can bleed them ok with the pump off.
On Sun, 14 Dec 2003 18:07:01 -0000, "Kerry Hoskin"
I sometimes, randomly, feel the top of radiators in our household as
I'm passing by. It's kind of a natural action born from experience of
these things rather than a predefined maintenance check.
If I get a cold radiator top I will then check the valve ends of the
radiator. If they are hot then I bleed the radiator. That action will
usually involve checking the other radiators in the vicinity.
Presumably it's a vented system? Have you checked that it isn't pumping
Does it have inhibitor in it? If not, the "air" may be hydrogen resulting
from corrosion. Next time you bleed, hold a lighted match by the bleed hole
and see whether the gas coming out is flammable.
Well yes, but . . .none of this answers my questions!
* Is it a sealed pressurised system (with filling loop and pressure vessel)
or is it vented with a small header tank for the primary circuit in addition
to the large header for the hot water system?
* If vented, is it pumping over? In other words, when it is running, is
water constantly flowing out of the vent pipe into the small header tank?
* What is the gas which you are bleeding out of your radiator - is it
By you? If not how do you know if it's got inhibitor in? Did the installers
claim to do it - they should have of course, but perhaps they want to
install a new system in a few years.
I don't know if there's a definitive test, the water will have a straw
colour or (perhaps something else - someone may enlighten us) or you may be
able to taste it.
One things for sure, if it's a new system make sure ther IS inhibitor in
before it gets much older.
On Sun, 14 Dec 2003 20:31:46 -0000, "Kerry Hoskin"
Check the inhibitor. The gas in the CH system most probably comes from
some chemical reaction within the system, rather than being allowed in
from outside the system. Inhibitor ought to stop that taking place.
If you've ever brewed your own beer you will know that yeast forms
bubbles by chewing on the nutrients in the beer mix - those bubbles
aren't formed because they come from outside the system! Your CH
system isn't a beer brewery in disguise, but it's a broadly similar
If it's a fairly new rad you can take the fitting out of the top corner,
put in a reducing bush from BES half inch X quarter product 6621, then
screw in an Auto air vent- BES product 7498. Make a careful adjustment
of the srew on the AAV and air will come out and water will stay in. All
for just over a pound!
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