Astra
Full Member
Posts: 219 
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Post by Astra on Mar 12, 2021 17:24:49 GMT
Central Heating upstairs hot,,, stone cold downstairs ...........Normally nice and toasty everywhere...........Problem I think Pump Stopped working needs changing Now new pump choice 5 metre head or 6 metre head ........am i right in thinking if I use a Grundfos UPS3 pump this will do either and will sort it all out for me  I have not done many of these in the past but do come up now and again many thanks for all your help and suggestions Guy's |
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Post by crowsfoot on Mar 12, 2021 18:34:25 GMT
Classic faulty pump fault on an older type of CH system Astra.
Grundfos is a good and well know brand of pump.
Make sure it's got power at the electrical connections and that it's not just off on a stat somewhere first.
If you give it a few taps with an hammer you might just get it going again if it's just the impeller that's sticking
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Post by battle1066 on Mar 12, 2021 18:40:25 GMT
As Tappy says but include plenty time for the pump change if it's a old sludge bucket by checking the F &E tank - they can take sometime to bleed through.
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Astra
Full Member
Posts: 219
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Post by Astra on Mar 13, 2021 19:40:34 GMT
Many thanks Guy's but what about what i said about the 5 metre head and 6 metre head pump needed will the Grundfos UPS 3 do what I said and that it will do both and just sort it all out for me |
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Post by crowsfoot on Mar 13, 2021 20:01:58 GMT
Its' not an easy answer astra without opening a can of worms-most of the pumps today can measure the head needed and adjust it themselves. The amount of pump head needed is enough to overcome the resistance of the index radiator (the index radiator is the radiator with the most resistance to flow). Normally it's the furthest away radiator (but that's not always the case). You'd need a mathematician to work it out for you. If I'm sticking my neck out.....Over ten rads go for the 6m head, below 10 use the 5m, it should have 3 speed settings on it for adjustment if it's an older style of pump that you're buying. NB Just had a look on S/fix at your pump and it is up to 6.5m head - so yes it's a goer  . |
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Post by battle1066 on Mar 13, 2021 20:07:26 GMT
Many thanks Guy's but what about what i said about the 5 metre head and 6 metre head pump needed will the Grundfos UPS 3 do what I said and that it will do both and just sort it all out for me UPS 3 will do upto 6.5 pM head. |
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Astra
Full Member
Posts: 219
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Post by Astra on Mar 13, 2021 21:36:13 GMT
Many thanks guy's for all your help !!!!!!!!!1
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