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Humidistat controlled fans

whjohnson
Fitted a 100mm SELV Xpelair Silavent fan a month or two ago. Client says it is running all the time. I said I think it is designed to do so but am now not so sure.

I thought initially that the fan would sit there awaiting a rise in hunidity before kicking in and doing its thing until the levels returned to below the humidistat trigger threshold, then I looked again and it seems that the fan runs all the time on a slow speed until a higher humidity level triggers the sensor and then the fan speeds up.

She's annoyed with the noise of the fan running all the time and is switching it off at the isolator until needed.

So, just how are these things supposed to actually work?
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    AJJewsbury:
    Am now led to understand that fitting humidistat controlled fans in the UK is not necessarily a good idea

    Humidistats can work perfectly well in the UK - I used to have one in my old bathroom and it kicked in most reliably every time I had a shower (that was a stand-alone humidistat I think from RS - rather than anything built into a fan). In my 'new' house the ventilation system runs at a low level constantly but the main fan unit has a humidistat built in so to boost the speed - and again that seems to work perfectly well.


       - Andy.


    I have a Vent Axia100mm "through the wall" fan, with humidistat switching from trickle to boost, and like Andy's mine works fine.


    regards,

    burn


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  • 0
    AJJewsbury:
    Am now led to understand that fitting humidistat controlled fans in the UK is not necessarily a good idea

    Humidistats can work perfectly well in the UK - I used to have one in my old bathroom and it kicked in most reliably every time I had a shower (that was a stand-alone humidistat I think from RS - rather than anything built into a fan). In my 'new' house the ventilation system runs at a low level constantly but the main fan unit has a humidistat built in so to boost the speed - and again that seems to work perfectly well.


       - Andy.


    I have a Vent Axia100mm "through the wall" fan, with humidistat switching from trickle to boost, and like Andy's mine works fine.


    regards,

    burn


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