Mike Ring wrote:
Thanks for the reply, Ed
Mike Ring wrote:
The 'power' is set by adjusting the burner pressure on the gas valve.
The original installer must have decided that the boiler was too big
for the circuit and decided to turn it down a bit.
I don't think he considered this - there is an option for a smaller boiler
which I would have chosen if I'd known anything; he should have steered me
to it, when the point was raised I said "more, more" and he should have
explained that 50btu was too much
I would expect that
this installation is short cyling becasue it is doing water heating
only ATM and would improve a bit when the heating is switched on.
Also if you choose the lowest setting you might not have enough for
mid winter.
I very rarely heat water, and it short cycles in midwinter - I've tried the
pump and balancing, but I don't seem to be ablr to get anywhere near enough
kiliwatts away
You could try to see what effect altering the pump speed has, it might
be simpler than messing with the boiler. Also if you do alter the
boiler you have to be competant to do so, which means should know
about and be familiar with U-gauges, leak detection fluid, and the
specifics of the gas valve/regualtor for the boiler etc.
The blurb says "the two models - 57 and 45 - have boiler range outputs as
shown (57k max, 50k mid, 45k min) "each appliance is preset at it's
midrange heat input; it looks as though there ought to be a fairly
straightforward preset.
I really don't want a new boiler!
I'm familiar with some of the other specific models in this series.
The heat input is adjustable over a continuously variable range by
adjusting the burner pressure.
You will need the instructions to find out where the test point is.
The regulator itself is likely to be a screw slot that is accessible
after you have undone a dust cover.
Whilst you could set the burner anywhere within the permitted range the
rating plate shows 3 specific values so that you can record the
'correct' setting for others in the future.
I would guess this boiler has already seen its best years.
--
Ed Sirett - Property maintainer and registered gas fitter.
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