Have a need to place an extractor fan within reach of a shower so
obviously have to fit a 12V one. No problem there, but I would like it
to be humidistat switched, looking around I could only find a limited
number of examples.

Has anyone used one of the separate humidistat switches, switching the
transformer and does it cause any problems?
Or do I have to hunt for a mains powered switch with volt free contacts
and switch the 12V side?

On 02/02/17 17:19, Lee wrote:
Have a need to place an extractor fan within reach of a shower so
obviously have to fit a 12V one. No problem there, but I would like it
to be humidistat switched, looking around I could only find a limited
number of examples.

Has anyone used one of the separate humidistat switches, switching the
transformer and does it cause any problems?
Or do I have to hunt for a mains powered switch with volt free contacts
and switch the 12V side?


I don't see why it should cause any problems switching the PSU.

Manrose humidistats are good (I have one) and also contain a run on
timer and auxiliary switch input to which you can wire a pull cored
momentary switch[1] to force the fan on for a time if required.

[1] Use the MK disabled alarm switch for this and buy a white cord to
replace the red one. Looks like any other pull cored when done.

Lee Wrote in message:
Have a need to place an extractor fan within reach of a shower so
obviously have to fit a 12V one. No problem there, but I would like it
to be humidistat switched, looking around I could only find a limited
number of examples.

Has anyone used one of the separate humidistat switches, switching the
transformer and does it cause any problems?
Or do I have to hunt for a mains powered switch with volt free contacts
and switch the 12V side?



Istr some mains ones are allowed in that location
, I have one to
fit somewhere..

Ah yes QT100

Also has humidistat version

Info
http://www.extractorfanworld.co.uk/a...-qt100-and-qt1
20-review-95-c.asp
--
Jim K


----Android NewsGroup Reader----
http://usenet.sinaapp.com/

Besides I don't see a problem with switching anything with a humidity
switch. If you are worried use a relay in between.
Brian

--
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This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"jim" k wrote in message
o.uk...
Lee Wrote in message:
Have a need to place an extractor fan within reach of a shower so
obviously have to fit a 12V one. No problem there, but I would like it
to be humidistat switched, looking around I could only find a limited
number of examples.

Has anyone used one of the separate humidistat switches, switching the
transformer and does it cause any problems?
Or do I have to hunt for a mains powered switch with volt free contacts
and switch the 12V side?



Istr some mains ones are allowed in that location , I have one to
fit somewhere..

Ah yes QT100

Also has humidistat version

Info
http://www.extractorfanworld.co.uk/a...-qt100-and-qt1
20-review-95-c.asp
--
Jim K


----Android NewsGroup Reader----
http://usenet.sinaapp.com/

On 02/02/2017 17:23, jim wrote:
Lee Wrote in message:
Have a need to place an extractor fan within reach of a shower so
obviously have to fit a 12V one. No problem there, but I would like it
to be humidistat switched, looking around I could only find a limited
number of examples.

Has anyone used one of the separate humidistat switches, switching the
transformer and does it cause any problems?
Or do I have to hunt for a mains powered switch with volt free contacts
and switch the 12V side?



Istr some mains ones are allowed in that location
, I have one to
fit somewhere..

Ah yes QT100

Also has humidistat version

Info
http://www.extractorfanworld.co.uk/a...-qt100-and-qt1
20-review-95-c.asp


Ooh, definitely worth considering, the back draught shutter would be a
nice to have feature in this location, as well.

On 02/02/2017 17:28, Tim Watts wrote:
On 02/02/17 17:19, Lee wrote:
Have a need to place an extractor fan within reach of a shower so
obviously have to fit a 12V one. No problem there, but I would like it
to be humidistat switched, looking around I could only find a limited
number of examples.

Has anyone used one of the separate humidistat switches, switching the
transformer and does it cause any problems?
Or do I have to hunt for a mains powered switch with volt free contacts
and switch the 12V side?


I don't see why it should cause any problems switching the PSU.

Manrose humidistats are good (I have one) and also contain a run on
timer and auxiliary switch input to which you can wire a pull cored
momentary switch[1] to force the fan on for a time if required.

[1] Use the MK disabled alarm switch for this and buy a white cord to
replace the red one. Looks like any other pull cored when done.

Maybe I was over-thinking whether the contacts would like the inductive
load of the transformer.

But the IP rated mains fan mentioned
up-thread looks promising instead

On 02/02/17 18:52, Lee wrote:
On 02/02/2017 17:28, Tim Watts wrote:
On 02/02/17 17:19, Lee wrote:
Have a need to place an extractor fan within reach of a shower so
obviously have to fit a 12V one. No problem there, but I would like it
to be humidistat switched, looking around I could only find a limited
number of examples.

Has anyone used one of the separate humidistat switches, switching the
transformer and does it cause any problems?
Or do I have to hunt for a mains powered switch with volt free contacts
and switch the 12V side?


I don't see why it should cause any problems switching the PSU.

Manrose humidistats are good (I have one) and also contain a run on
timer and auxiliary switch input to which you can wire a pull cored
momentary switch[1] to force the fan on for a time if required.

[1] Use the MK disabled alarm switch for this and buy a white cord to
replace the red one. Looks like any other pull cored when done.

Maybe I was over-thinking whether the contacts would like the inductive
load of the transformer.

The PSU will probably be switch mode and not the big toroidal massive
inrush beast you may be thinking of

But it is worth checking - does the fan come with its PSU and if so,
does it say waht type it is?

On 02/02/2017 19:38, Tim Watts wrote:

The PSU will probably be switch mode and not the big toroidal massive
inrush beast you may be thinking of

But it is worth checking - does the fan come with its PSU and if so,
does it say waht type it is?


Good point, hadn't considered it may have a SMPSU.

The one I was looking at didn't specify and at only 5W the picture of
the largish "transformer" box could easily have contained either

Lee