heating eng


Postby bazza » Wed Sep 26, 2007 9:38 am

hi mate just got the service manual for for the baxi 105e n it says the max capacity of the ch system is 80ltr so am i right in thinkin if i fit a 10 ltr external vessel with a vol. of 10.9 it wud allow for 100 ltrs of ch system capacity therefor wud b sufficiant enough to cure the problemTHANX for any advise bazza ps to answer the question from your last post yes all the rads heat up no probs until the pressure gauge flies up to 3 bar ah ah
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Postby humperdink » Wed Sep 26, 2007 6:00 pm

you really should try recharging the expansion vessel, & if you have found the servicing manual it will mention it in there, normally as part of a yearly maintainance check
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Postby bazza » Wed Sep 26, 2007 9:08 pm

hi humperdink THANX 4 advise the reason i am interested in a external vessel is the boiler is in a airin cupboard in bedroom n there isnt enough headroom to get to the shrader valve on vessel n test it so i wud have to remove the boiler completely so the external vessel just seems the easiest option bazza
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Postby htg engineer » Wed Sep 26, 2007 9:18 pm

Check the pressure vessel first, push the pressurising valve with your finger to see if full of air or water, if it's water then the diaphragm has split and you definately need a new vessel.

If it's water you can try re-pressurising it, open the pressure relief valve and re-pressurise using a footpump.

As for the replacement pressure vessel, it should be the same capacity as the one on the boiler, it should tell you in the specifications of the boiler.. You need to tee into the heating return pipe as close to the boiler as possible.
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Postby bazza » Thu Sep 27, 2007 2:01 pm

CHEERS htg engineer advise much appreciated bazza
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Postby htg engineer » Sat Sep 29, 2007 9:15 am

Check the pressure vessel first, push the pressurising valve with your finger to see if full of air or water, if it's water then the diaphragm has split and you definately need a new vessel.

If it's AIR you can try re-pressurising it, open the pressure relief valve and re-pressurise using a footpump.

As for the replacement pressure vessel, it should be the same capacity as the one on the boiler, it should tell you in the specifications of the boiler.. You need to tee into the heating return pipe as close to the boiler as possible.
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