Myson Circulater Noise

I have a Myson circulator on the hot water system and all of a sudden it has started to make a funny, loud noise intermittently, almost like there is air in there or it is spinning/slipping. Most of the time is ticks along fine, but then all of a sudden it makes these loud noises.

I did look for a bleed valve, but the manual says it is self-venting. Not sure how old it is, but probably about 14 years or so.

If I need to replace it, is it easy enough to do (looks like it is just joined to the pipe with a compression joing - albeit large - and unsrewing both nuts would release it)? Is it safe to run it with this noise?

Any ideas? Thanks Greg

Reply to
Greg
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If you are sure that there is no air in there, it is almost certainly the bearing of the pump on its way out.

Then it's done pretty well.

It isn't difficult to do in principle, but depends on the type of fittings used.

Have a look at

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If you have flanges with valves like 8132 or 8134 then *if* you can turn them off it will help. However, after 14 years the valves may well be seized. Some WD40 down the spindles may help

If you just have flange unions (i.e. same kind of thing but no valve to turn off, then you will have to drain down the system to at least below the pump. Take care with heating water, because if it is brown, this is iron compounds and they are among the earliest indellible dyes known to man.

Before starting on this, check the size and type of pump. The main dimensions are the distance between the flanges which in domestic installations is normally 130mm. and the thread of the pump fittings, normally 1 1/2". . Occasionally other sizes are used so be careful before committing yourself. The other factor is the pump power. If you can find a reference on the plate of the existing pump then look for power in W or for the head of the pump.

In any case turn off the power to the boiler and check that there is no power at the pump. If you are draining tie up the ball valve in the small header tank in the loft.

If you can get the valves turned off or after draining, You can try to undo the union nuts to the pump. These may also be seized.

It is then a case of fitting the new pump. Normally pumps come with new sealing washers. Make sure you remove the old ones, which may well disintegrate anyway. Wiring is just Live/Neutral/Earth and that's about it.

It can seize totally and get pretty hot, so it would be an idea to get it changed as soon as possible.

.andy

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Reply to
Andy Hall

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