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Underfloor Heating Question?

  • 05-10-2017 1:22pm
    #1
    unnamed
    Registered Users, Registered Users 2 Posts: 194 ✭✭


    Hi,
    I have a pre-2004 underfloor heating system (which needed a lot of work after I moved in a couple of months ago).
    There is one thing I don't understand, which I was hoping someone could help me with:
    When a room's temperature drops below the set value, the thermostat will open the actuator to allow hot water into that zone, it will also turn on the boiler if required, and the pumps will start pumping.  
    What I don't understand is the time-delay for this to happen, what I would imagine should happen is the actuator will open and turn on the boiler as soon as the thermostat send the current (once you hear the click).
    What actually happens is that at some stage later (1 or 2 minutes) the value on the manifold opens, pushes the actuator into the "on" position, and then the boiler and pumps starts. 
    What is the delay?  Do the actuators hold the values closed, and when the thermostat clicks, it allows to value to open slowly?  When it has opened, the pumps and boiler kick in?  
    Maybe a silly question, just doesn't make sense to me.
    Thanks.


Comments

  • #2
    froshtyv
    Registered Users, Registered Users 2 Posts: 225 ✭✭froshtyv


    Most actuator heads on an underfloor heating manifold are electrothermal, so they are slow at opening.

    You do not want your circulating pump to come on if there is no open circuit. If it your pump switched on straight away when your thermostat calls for heat and your actuator head doesn't open for 4-5 mins your pump is pumping against a dead head, unless there is a bypass circuit.

    So you either have an auxiliary switch on the actuator which closes when fully opened, this tells the pump to turn on.

    Or if you do not have an auxiliary switch on the actuator you can get an underfloor heating logic strip that has a time delay to allow the actuator head to open.


  • #3
    unnamed
    Registered Users, Registered Users 2 Posts: 194 ✭✭unnamed


    Thank you very much for the answer, it makes perfect sense.
    > So you either have an auxiliary switch on the actuator which closes when fully opened, this tells the pump to turn on.
    I think this is the setup we have.
    Thank you again.


  • #4
    Steve.g
    Registered Users, Registered Users 2 Posts: 13 ✭Steve.g


    Hi. I have underfloor heating system. The air to water system..just recently there about 2 weeks ago noticed that the heat pump was running a lot.. and my dining was cold. I was wondering why the dining room wasn't being heated. I did research on line and I believe it's thr 'Electrothermic actuator' that's the problem.. can they have faults for some reason I think it's not registering with the dining room stat.


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