On Tue, 6 Jan 2004 21:04:39 -0000, "John Stumbles"
] wrote:



Wasn't too impressed with it tbh: it looks as if someone's shoved all the
controls into the box and slammed the cover shut on it :-). In commissioning
it you have to swing down the electronic controls housing so you can rotate
the diverter valve enough to get the head off it to actuate it for bleeding
the system. The ignition cable goes across the controls housing so you have
to unplug the cable to swing the housing down, which means you can't operate
the boiler in this state. To get at the gas valve you have to swing down the
controls. I notice there's no mention in the manual of measuring the burner
pressure, because if you touch the burner pressure test point how are you
going to leak-test it afterwards?

I think that this might be a function of the injector and mixing
arrangement with the fan.

Mine has a fairly similar arrangement with the injector and fan,
although the gas feed is at the back. I asked the manufacturer
about it because there was no mention in the commissioning
instructions regarding pressure test, even though there are nipples on
the gas valve on the input and output side.

They told me that the setup procedure doesn't involve the equivalent
of burner pressure testing and in fact, if measured it would show
anything from slightly positive to slightly negative. Instead of
this, there are adjusters on the gas valve - one for the burner
running at minimum level and the other for maximum. A combustion
analyser is used and the CO2 level measured at either end - it's a bit
iterative and took a little while to do. It has to be within a range
at either end. They then call for a CO check at top and bottom as
well which must be less than so much, The input gas rate is also
checked at top and bottom as well.

IIRC, the Keston has a similar procedure.

(You could probably just about manage to
swing the controls out of the way enough to see the valve with the boiler
running, but it'd be a bit iffy.) Shame really, in other respects it seems a
nice enough bit of kit, and it's the only one at a reasonable price.

Another downer is the weight: 45kG. Definitely not a 1-man install unless
you're governor of California :-)

So how did you manage?





..andy

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