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Disable heating element

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  1. #1
    ajm
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    Default Disable heating element

    I would like to disable the heating element in this water pump. There is another thread I have asking about water pumps. Thought I had better start a new thread for this question. If I want this to pump cold water only, I believe I need to disconnect the heater element (thoughtfully done in red at bottom left) which means removing the brown wires coming from it. The circuit diagram shows a thermostat and thermal cut out. Does the thermostat become redundant if the heating element is removed?

    Sk

  2. #2
    ajm
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    Default Disable heating element

    Circuit diagram and electrics

    Sk

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    Just disconnect at the pressure switch.

  4. #4
    ajm
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    Default Disable heating element

    So the brown wire at the right, coming out of the pressure switch ( red and black part on the top) that comes up from the incoming power supply. What about the second brown wire out of the power supply that goes to the element? Should that come off also?

    Sk

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    if you disconnect the heater you will disconnect the pressure switch as they are all in series you have to disconnect the heater and bridge it out.

    Enlighten me as you posted this in the landscaping section, why would you be pumping hot water in the garden?

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    Quote Originally Posted by Bros View Post
    if you disconnect the heater you will disconnect the pressure switch as they are all in series you have to disconnect the heater and bridge it out.

    Enlighten me as you posted this in the landscaping section, why would you be pumping hot water in the garden?
    If you bridge the heater you will blow the fuse.
    The pressure switch, heater, thermostat and cutout are in series, pump is parallel. It just needs the pressure switch disconnected to take the heater out of service.

  7. #7
    ajm
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    Default Disable heating element

    Quote Originally Posted by droog View Post
    If you bridge the heater you will blow the fuse.
    The pressure switch, heater, thermostat and cutout are in series, pump is parallel. It just needs the pressure switch disconnected to take the heater out of service.
    Thank you.

    Sk

  8. #8
    ajm
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    Default Disable heating element

    Quote Originally Posted by Bros View Post
    if you disconnect the heater you will disconnect the pressure switch as they are all in series you have to disconnect the heater and bridge it out.

    Enlighten me as you posted this in the landscaping section, why would you be pumping hot water in the garden?
    Pumping hot water as the cows prefer it to straight cold water. :0)


    Actually repurposing a hot spa pump. Want to disconnect the heating part so it's just a straight pump.

    Se

  9. #9
    ajm
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    Default Disable heating element

    Forgive the red letters on the picture. Trying to add using software on phone. Hmm..

    Both A & B have an Active power feed from the incoming power supply, c and d respectively. Disconnecting C will remove power from the switch. The Active power connection (d) passes through B to the pump connection.

    Hopefully that's right. I want to be able to show the sparky the pump this afternoon when he is here for something else and have him say that it's good to go.

    Cheers.

    Se

  10. #10
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    That is not what is shown on the circuit diagram, so any suggestions above are irrelevant.
    If you have an electrician coming then get him to modify it.

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    Quote Originally Posted by droog View Post
    If you bridge the heater you will blow the fuse.
    The pressure switch, heater, thermostat and cutout are in series, pump is parallel. It just needs the pressure switch disconnected to take the heater out of service.
    You are correct, when I blew the image up it becomes apparent.

  12. #12
    ajm
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    Default Disable heating element

    Quote Originally Posted by droog View Post
    That is not what is shown on the circuit diagram, so any suggestions above are irrelevant.
    If you have an electrician coming then get him to modify it.
    Hence my general confusion. He's cancelled this arvo but here tomorrow. More than happy to leave it until then. Cheers all the same.

    Se

  13. #13
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    Quote Originally Posted by droog View Post
    That is not what is shown on the circuit diagram, so any suggestions above are irrelevant.
    If you have an electrician coming then get him to modify it.

    After having another look at it the circuit diagram may be correct, just the way it is wired is confusing. The missing part is a picture from the other side showing the wiring on the opposite side of the terminal blocks.

  14. #14
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    The other missing part is where is the heater situated, is it in the pump or in a separate tank?

    A photo looking down from the top would be handy

  15. #15
    ajm
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    Default Disable heating element

    Quote Originally Posted by Bros View Post
    The other missing part is where is the heater situated, is it in the pump or in a separate tank?

    A photo looking down from the top would be handy
    The heating element is under the centre. If you expand this picture, you can see a circular shape in the black plastic. The element is under that and goes into the water pump proper.

    Se

  16. #16
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    pump.jpg
    Is the cable indicated for the pump or is it the supply ?

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    Looks like the circuit diagram is correct, just hard to tell the different components by pictures alone.
    Of course any advise should be checked by a qualified person with the device in hand but I believe taking the heater out of circuit can be achieved by disconnecting the wire indicated.
    pump2.jpg

    This will require any potentially exposed live terminals to be suitably insulated by your electrician.

  18. #18
    ajm
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    Default Disable heating element

    Quote Originally Posted by droog View Post

    Is the cable indicated for the pump or is it the supply ?
    That's the supply. I actually thought that the heater part could be bypassed altogether by joining the supply in to the pump wire. Needless to say, I forgot to ask the sparky when he was here. Thankfully, he's based near the kids bus to school so will take it up I the morning.

    lk

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