Just examined my hot water cylinder prior to draining the CH, and
discovered it's primatic... this doesn't overly bother me because it's
being replaced in a week and a half with a combi boiler, but before
that I need to replace my rad valves with thermostatic ones.
Is there anything I need to be aware of when draining down the
system? I realise I need to close off the rising main feed to the
header tank - is there anything else? Similarly, is there anything
special I need to do when refilling. I realise adding inhibitor is
a bad idea... A google search only turns up someone with a
horror story about draining one, but no advice...
I have a back boiler - the front is marked Baxi Bermuda G2. The
sole control is a knob with 0,1,2,3, lightning symbol, cross symbol.
Presumably if I turn off the power and gas supply to the boiler when
draining I will need to relight the pilot light afterwards. Does anyone
have a clue how I am supposed to do this (no manual anywhere, and
no one to ask - the previous owner is dead...) I can take a guess that
turning the knob to lightning symbol might accomplish something, but
it would be nice to have a clue in advance :)
Thanks for any advice!
It'll be the main cold water storage tank rather than a header tank (i.e.
big rather than small) if you've got a primatic.
- is there anything else? Similarly, is there anything
should be OK
yup, turn to lightning symbol and you probably have to push it in to let gas
through to the pilot (depending on the type of gas valve) and then push the
button beside it which should create a spark to light the pilot. You'll
usually have to push the spark button several times. Once the pilot lights
keep holding the control valve pushed in for 30s or so an then when you let
go the pilot shoudl stay alight and the main burner should fire up if you
turn it to 1, 2 or 3. If you don't have a spark button you'll have to find
the pilot (should be a window the size of a large postage stamp) and light
it manually - not easy on a back boiler as it's usually buried away a foot
or so back underneath the gas fire part of the appliance.
If you have a gas blowlamp and some thin pipe (e.g. gas fire or brake pipe)
you can tape the pipe to the nozzle of your blowlamp (covering any aeration
holes at the base of the burner) and light the gas coming out of the other
end of the pipe and use it as a taper to reach the pilot light hole.
However if you turn the boiler control down to 0 so it doesn't fire up the
main burner you should be able to drain the system enough to replace your
rad valves without switching off the gas to the boiler - the boiler should
stay full of water, and even if it emptied the pilot light shouldn't give it
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