On Jun 3, 6:16*pm, "MuddyMike" wrote:
Our five year old Mexico HE36 gas boiler needs yet another auto air vent
valve. It was replaced in the final months of warranty due to it leaking and
dribbling water onto the electrics causing the trip to go.
Parts Centre are the only stockist I can find that have one, and one only!
Is in the Portsmouth branch but they are sending it up to me "next day"
delivery for four quid postage. That's not bad as it would have cost more
then that in diesel for me to have driven to the nearest branch

Anyone else aware of this being a regular failure on these boilers?

Mike

Honeywell do a version with a screw down cap which has a fibre washer.
With the cap open the valve will vent air from the system. Once clear
screw the cap down and if any air/hydrogen does accumulate it opens
the valve and collects under the cap. This causes the fibre washer to
dry out and shrink, allowing the air to escape. If fluid reches the
fibre washer it expands again and closes off the vent.
Another option is to extend the air discharge point via a tube to
somewhere safe. Then any minor weep will not cause damage to your
electrics.
Unless you have a problem elsewhere the air vent should not be needed
after a couple of weeks as all the air should have left the system.

On Jun 3, 10:05*pm, cynic wrote:
..
Unless you have a problem elsewhere the air vent should not be needed
after a couple of weeks as all the air should have left the system.

Yes, it's a regular point of failure on any AAV. They should only be
used to get the air out after filling and then the cap screwed down.
If more air accumulates, there is a problem somewhere; automatic air
venting should not be needed.

There was one design (expensive ISTR) that had the air release valve
above the float and connected by a linkage, the idea being the mucky
water didn't get near the valve.

This is the valve.
http://share.ovi.com/media/Muddymike...uddymike.10804

I have plugged the leak with the set screw and nut you see in the top, Bit
fuzzy that picture, must check before uploading in future.

Mike

On Sat, 04 Jun 2011 13:08:34 +0100, MuddyMike wrote:

This is the valve.
http://share.ovi.com/media/Muddymike...uddymike.10804

If that's an Ideal Icos/Isar/I**** series the AAV is going to be the
least of your worries ;-/


--
John Stumbles -- http://yaph.co.uk

Eagles may soar, but weasels don't get sucked into jet engines.

"YAPH" wrote in message
...
On Sat, 04 Jun 2011 13:08:34 +0100, MuddyMike wrote:

This is the valve.
http://share.ovi.com/media/Muddymike...uddymike.10804

If that's an Ideal Icos/Isar/I**** series the AAV is going to be the
least of your worries ;-/


No its £2000 worth of Mexico HE36, not without trouble mind :-(

Mike