cupboard ventilation

[artvandalay]

does anyone know where to get a simple thermostat to control some fans in a hifi cupboard. and what sort of temperature would be good to have them coming on at?

[TimH]

Re: cupboard ventilation

Hi,

The simplest way is probably to use a central heating room thermostat, for example: http://www.screwfix.com/app/sfd/cat/...04167&id=84704

Link this to a bathroom extract fan, (e.g. http://www.screwfix.com/app/sfd/cat/...04281&id=71740 and you've got your cupboard ventilated.

As for the temperature setting, read the manuals for your AV kit to see what maximum temperature they state. You need to ensure that you don't have the extract fans coming on just because the central heating is on, so something like 25-28 degC would be a good starting point.

HTH,

Tim.

[jon_itmagic]

Sorry to drag such an old thread up, but this deals with my exact problem...

I'm probably being a bit thick here, but room stats switch on the power when the temperature falls BELOW a pre-set value.

If I use a room stat to control an extractor fan (to keep a room cool), what do I need to do to make it operate in reverse?

Thanks,

Jon

[toscal]

Some room stats also allow for cooling as well. What about using a coule of PC Fans with a temperature controller. I'm thinking along the lines of a 3.5 or 5.25" drive bay cooling box you then connect to a couple of PC type fans to this. I found this on maplin https://www.maplin.co.uk/module.aspx...=48350&doy=4m6
or this one

https://www.maplin.co.uk/Module.aspx?ModuleNo=47445&&source=14&doy=4m6

Though I think both of these devices won't actually turn the fans on or off, it just varies the speed and therefore airflow.

Make sure if you go the Pc fan route to get ultra quiet fans, as the cheap and chearful ones can be very noisy after a while.

[TimH]

I'm probably being a bit thick here, but room stats switch on the power when the temperature falls BELOW a pre-set value.

If I use a room stat to control an extractor fan (to keep a room cool), what do I need to do to make it operate in reverse?

Jon,

Check out this page:

http://www.sunvic.co.uk/datasheet_tlx9000.html

You'd normally wire your boiler across 1 & 3, to switch on a fan you'd wire that across 1 & 2. Make sure you provide an isolation switch so you can maintain the system if needed, and in an industrial environment you'd have a warning sign stating equipment may start automatically...

HTH,

Tim.