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Water pump - adjusting sensitivity

  • 27-06-2016 4:39pm
    #1
    mrcheez
    Registered Users, Registered Users 2 Posts: 14,174 ✭✭✭✭


    I have a water pump in my external boiler house that directs water up from a water tank to the sink/toilet in the bathroom.

    Normally I turn the tap on a little and it takes about a second for the pump to kick in, but I was away for 3 weeks and on my return it seems that I have to turn the tap on quite a few turns before the pump kicks in (at which point I have to be prepared to turn it back down quickly as it shoots through at speed).

    Is there any reason why the sensitivity would have dropped after my 3 weeks absence?

    Can I tweak the sensitivity myself?

    It's a pump similar to the one in this illustration:

    whole-house-detail-with-PUMP-md.jpg

    pump looks similar to the following:

    pump-whs-35-230v.jpg

    (I don't know the specific make/model at the moment)

    When I used to turn on the tap, the water would come through weakly at first for about 1 second before the pump turns on (you can hear it) and the water starts shooting out in force.

    Now when I turn the tap to the same degree (about 1 full revolution) the pump doesn't kick in until the water drips to almost a trickle (about 20 seconds)

    I now have to turn the tap about 4 revolutions before the pump kicks in and the tap has to be quickly turned back to the 1 revolution to avoid water splashing over the sides with the force.

    So it seems to me that during my 3 week absence the lack of use of the pump seems to have affected the sensitivity (i.e. it needs a strong pull before the pump kicks in). I would normally have used the pump every day while in the bathroom using the sink.


Comments

  • #2
    K.Flyer
    Registered Users, Registered Users 2 Posts: 8,565 ✭✭✭K.Flyer


    Your pump is a Grundfos MQ.
    The flow sensor or the pressure switch may be a bit sticky and may free up when you start using it regularly again.
    New parts are available if it doesn't right itself and if you are handy with tools, you can do it yourself.

    Useful video..



  • #3
    mrcheez
    Registered Users, Registered Users 2 Posts: 14,174 ✭✭✭✭mrcheez


    K.Flyer wrote: »
    Your pump is a Grundfos MQ.

    is that based on the picture? That was just an example, or are they the only supplier of such pumps?


  • #4
    K.Flyer
    Registered Users, Registered Users 2 Posts: 8,565 ✭✭✭K.Flyer


    mrcheez wrote: »
    is that based on the picture? That was just an example, or are they the only supplier of such pumps?

    Yes, the picture you posted is a Grundfos MQ.
    If yours is different from that then you will need to take a look to get make / model as there are so many makes of pumps out there.


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