SMC central heating pump

Discussion in 'UK Home Improvement' started by Ricci Hammond, Jan 18, 2004.

  1. I need to get a replacement central heating pump, is it possible to buy the
    "old style" i.e. *big*, central heating pumps, that I would be able just
    swap over with the dead one? Can only seem to find new small ones which
    would require some serious re-piping which I would rather avoid...

    Also my radiators are run by a separate 3-way pump. Can you buy these, I
    have only been able to find normal 2way central heating pumps.


    Regards,

    Ricci.
    Ricci Hammond, Jan 18, 2004
    #1
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  2. Knew I forgot something...

    I can't seem to find any info on SMC, I think is the company that maked the
    pumps and thermostat etc. Have they changed name or out of business ?
    Ricci Hammond, Jan 18, 2004
    #2
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  3. Ricci Hammond

    Cicero Guest

    "Ricci Hammond" <> wrote in message
    news:TzAOb.212$...
    > I need to get a replacement central heating pump, is it possible to buy

    the
    > "old style" i.e. *big*, central heating pumps, that I would be able just
    > swap over with the dead one? Can only seem to find new small ones which
    > would require some serious re-piping which I would rather avoid...
    >
    > Also my radiators are run by a separate 3-way pump. Can you buy these, I
    > have only been able to find normal 2way central heating pumps.
    >
    >
    > Regards,
    >
    > Ricci.
    >
    >

    =============
    I'm not familiar with the details of your system but I'm rather curious.
    Have a look at this - it looks like what you've described:

    http://www.gasman.fsbusiness.co.uk/fully_pumped_systems.htm

    If this is yours you should find a source for your pumps on the same page.

    Cic.
    Cicero, Jan 18, 2004
    #3
  4. i`ve not seen SMC pumps for years now,think they have gone out of business
    "Cicero" <> wrote in message
    news:WMAOb.3133$...
    >
    > "Ricci Hammond" <> wrote in message
    > news:TzAOb.212$...
    > > I need to get a replacement central heating pump, is it possible to buy

    > the
    > > "old style" i.e. *big*, central heating pumps, that I would be able just
    > > swap over with the dead one? Can only seem to find new small ones which
    > > would require some serious re-piping which I would rather avoid...
    > >
    > > Also my radiators are run by a separate 3-way pump. Can you buy these, I
    > > have only been able to find normal 2way central heating pumps.
    > >
    > >
    > > Regards,
    > >
    > > Ricci.
    > >
    > >

    > =============
    > I'm not familiar with the details of your system but I'm rather curious.
    > Have a look at this - it looks like what you've described:
    >
    > http://www.gasman.fsbusiness.co.uk/fully_pumped_systems.htm
    >
    > If this is yours you should find a source for your pumps on the same page.
    >
    > Cic.
    >
    >
    jeff stonehouse, Jan 18, 2004
    #4
  5. Ricci Hammond

    John Chapman Guest

    "Ricci Hammond" <> wrote in message
    news:7CAOb.213$...
    > Knew I forgot something...
    >
    > I can't seem to find any info on SMC, I think is the company that maked

    the
    > pumps and thermostat etc. Have they changed name or out of business ?
    >

    SMC was based in Bridgwater Somerset but went out of business some many
    years ago. I have an SMC system which has proved trouble free over 23 years.
    There are 2 pumps. The first one is a "3 Port pump" from which hot water is
    pumped to the cylinder coil and this pump is directly connected to the
    second pump which sends hot water around the heating circuit.
    The SMC pumps can be dismantled into 2 parts and the insides cleaned out
    before reassembly which I have done on a couple of occasions.If the first
    pump fails then the biggest problem will be to find a 3 port pump to
    replace it. Some years ago I enquired at a plumbers merchant in Bridgwater
    called Thompsons who then had some in stock but they said today you would
    replace it with a motorised 3 port valve.
    Hope this helps. Email me direct if you want more info on dismantling pump.
    John Chapman
    John Chapman, Jan 19, 2004
    #5
  6. Thanks, the SMC system on that page is exactly what I have installed. I
    thought the 3way pump was feeding my radiators but I can't see where the
    pipes go so I am going to assume that web site is how it is actually set up.

    My problem is strange, The radiators get hot, but there is very little hot
    water.. If I have the wall thermostat set high so the heating stays on then
    the hot water tank gets hot...

    Both pumps seem to be working (I think), but I have now found that there is
    air in the hot water supply. It comes out of the hot taps and the power
    shower

    Any idea what could be causing these problems???


    "Cicero" <> wrote in message
    news:WMAOb.3133$...
    > I'm not familiar with the details of your system but I'm rather curious.
    > Have a look at this - it looks like what you've described:
    >
    > http://www.gasman.fsbusiness.co.uk/fully_pumped_systems.htm
    >
    > If this is yours you should find a source for your pumps on the same page.
    >
    Ricci Hammond, Jan 23, 2004
    #6
  7. Ricci Hammond

    Cicero Guest

    "Ricci Hammond" <> wrote in message
    news:7UfQb.284$...
    > Thanks, the SMC system on that page is exactly what I have installed. I
    > thought the 3way pump was feeding my radiators but I can't see where the
    > pipes go so I am going to assume that web site is how it is actually set

    up.
    >
    > My problem is strange, The radiators get hot, but there is very little hot
    > water.. If I have the wall thermostat set high so the heating stays on

    then
    > the hot water tank gets hot...
    >
    > Both pumps seem to be working (I think), but I have now found that there

    is
    > air in the hot water supply. It comes out of the hot taps and the power
    > shower
    >
    > Any idea what could be causing these problems???
    >
    >
    > "Cicero" <> wrote in message
    > news:WMAOb.3133$...
    > > I'm not familiar with the details of your system but I'm rather curious.
    > > Have a look at this - it looks like what you've described:
    > >
    > > http://www.gasman.fsbusiness.co.uk/fully_pumped_systems.htm
    > >
    > > If this is yours you should find a source for your pumps on the same

    page.
    > >

    >
    >

    ==================
    I've just seen your reply (above). As I said previously I'm not familiar
    with this system BUT when I've had a chance to think about it I'll get back
    to you with some suggestions.

    Cic.
    Cicero, Jan 24, 2004
    #7
  8. Ricci Hammond

    Cicero Guest

    "Ricci Hammond" <> wrote in message
    news:7UfQb.284$...
    > Thanks, the SMC system on that page is exactly what I have installed. I
    > thought the 3way pump was feeding my radiators but I can't see where the
    > pipes go so I am going to assume that web site is how it is actually set

    up.
    >
    > My problem is strange, The radiators get hot, but there is very little hot
    > water.. If I have the wall thermostat set high so the heating stays on

    then
    > the hot water tank gets hot...
    >
    > Both pumps seem to be working (I think), but I have now found that there

    is
    > air in the hot water supply. It comes out of the hot taps and the power
    > shower
    >
    > Any idea what could be causing these problems???



    ===================
    Some possibilities - mainly guesswork......

    The 3 way pump ('controller pump') in the picture is actually supplying the
    hot water circuit. There is obviously a fault somewhere in this circuit.
    There are a couple of possibilities. First the 'cylinder thermostat'. You'll
    find this about 2/3rds of the way up on the side of the hot water cylinder.
    You could try adjusting this or even replacing it. They're quite cheap.

    More likely though is the pump itself. You say that this appears to be
    working. My guess is that the rotor (the bit that actually does the pumping)
    has partly rusted away and you're only hearing the spindle turning. This
    would explain why you get very little hot water but more when you have the
    radiator circuit on for a long time. It would appear that the other pump
    (radiator pump) is doing work it was not intended to do by pumping through
    the wrong circuit ( i.e. the hot water circuit). Obviously this is very
    inefficient which is why it takes a long time to heat the water.

    As far as air in the system is concerned I can only guess that this is
    actually caused by the power shower which might be creating a partial vacuum
    in the by pipework. However this is a separate issue from the lack of hot
    water and I would suggest that you concentrate on getting the heating
    circuits sorted first. Try the following.

    I would suggest that you turn off the radiator circuit and check to see if
    the hot water circuit produces any hot water when it is running on its own.
    If it doesn't then it's pretty certain that the pump is faulty. It's
    difficult to be sure from the picture but it looks as if a standard modern
    pump would fit as a replacement. You might need to replace the pump valves
    at the same time but these usually come with a new pump.

    One further thing to be aware of. Your system would appear to be quite old
    and if that is the case then your pipework may be old imperial 1" rather
    than more modern 22mm. If this is the case then you'll need to get 'Imperial
    size' olives to go into any compression fittings you change such as those on
    the pump valves. You'll need to check the size of your pipes by measuring -
    1" or 22mm.

    I think that's enough to be going on with - let me know how you get on. As
    you can appreciate it's rather difficult to diagnose without being 'hands
    on' but there's always a solution.

    Cic.
    Cicero, Jan 25, 2004
    #8
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