ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
12 Lead Motor Connection Weird
by emolatur - 01/19/22 02:40 PM
Any women electricians here?
by gfretwell - 01/17/22 01:44 PM
Well There's your problem.
by gfretwell - 01/08/22 12:17 AM
Happy New Year!!
by HotLine1 - 01/04/22 09:50 AM
Sangamo s309.2
by Robski - 12/31/21 04:54 PM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
0 members (), 48 guests, and 16 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
#199275 02/18/11 10:41 PM
Joined: Jan 2011
Posts: 19
C
Member
Has anyone installed a humidistat on the ceiling of a bathroom? A consultant wants to put in new fans, with a humidistat mounted on the ceiling, and a digital timer so that when it gets too humid, it will turn on whether the owners are at home or not..but why the ceiling, why not on the wall? is there a difference? thanx

candyman #199276 02/18/11 10:58 PM
Joined: Mar 2007
Posts: 404
Member
My guess would be because steam rises, and you'd have a higher humidity up at the ceiling.

candyman #199277 02/18/11 11:44 PM
Joined: Jul 2004
Posts: 9,677
Likes: 9
G
Member
If they were not home, where would the steam come from?
I agree the humidistat should be down low if you are looking for ambient humidity. Wet air is heavier than dry air.


Greg Fretwell
gfretwell #199284 02/19/11 10:42 AM
Joined: Nov 2007
Posts: 763
K
Member
What about something like the Nutone/Broan QTXEN110S fans that have the humidistat and a 5 to 60 minute timer built in. You could also install a wall switch for manual fan operation.
You can look over the wiring options in the install manual:
Nutone/Broan

candyman #199285 02/19/11 11:10 AM
Joined: Jan 2005
Posts: 5,316
Cat Servant
Member
I don't think we fully understasnd what they're trying to accomplish.

It seems to me that they want the fan to operate automatically. This means two things:

First, the fan will run for a period after the bather has left the room; and,

Second, the designer believes that the room won't be dry until the fan is drawing in dry air. Hence, placing the sensor closer to the fan.

Sure, most folks would simply use a timer. Trouble is, a timer measures time, not moisture. Plus, there is something creepy about flipping the switch 'off' and having the fan continue running.

Now, if only the fan had a 'foul odor' sensor!

candyman #199288 02/19/11 12:16 PM
Joined: Jul 2004
Posts: 9,677
Likes: 9
G
Member
I live in the mildew capital of the world. It always seems to start down in the corners at the bottom. That is where the high humidity is. (for a number of scientific reasons) I suppose we put the fan up top because the duct work is easier to run from there.


Greg Fretwell
gfretwell #199293 02/19/11 12:57 PM
Joined: Nov 2007
Posts: 763
K
Member
I donít know if it is still applicable, but a few years back on new construction, either builders or HOís in the area were apparently getting some sort of energy tax credit for installing a timer on one of the bath fans, so it could cycle on and off during the evening to remove humidity and stale air. We would put the electronic timer switch in a remote location, but also install as wall switch in the bath to override the timer for manual fan use.

candyman #199297 02/19/11 03:26 PM
Joined: Mar 2005
Posts: 1,803
Member
The crux is to put the fan where it will best force the damp air in the bathroom to circulate, mix and draw fresh, drier air in, from say the corridor or bedroom adjacent, while ejecting humid air to outside. The speed that gas and water vapor molecules move is incredible, [hundreds of mph], so the air in a room will become homogenous eventually. Where you put the humidistat is thus pedantic, IMHO, considering the use-ratio, but perhaps it's easier to wire in the ceiling? Cold spots on walls can create dewpoint conditions creating condensation that mold can live on, and these spots are generally low down or in corners out of drafts. But surely the main job for a fan is to get rid of nasty niffs from the khazi? sick A delay-off timer on the light circuit works great.

I have one bathroom fan with a humidistat built-in - works just fine but 'her indoors' can't leave the danged thing alone and keeps fiddling with the adjuster knob, either because it didn't go on when she ran a bath or it was already on when she entered the room. Keeps her busy I suppose!

wave [wiping condensation off the mirror for a shave, my pet hate! Why can't we have heated mirrors? ]


Wood work but can't!
candyman #199298 02/19/11 04:49 PM
Joined: Jul 2004
Posts: 9,677
Likes: 9
G
Member
Quote
wave [wiping condensation off the mirror for a shave, my pet hate! Why can't we have heated mirrors? ]


Use your wife's hair dryer to clear off the mirror


Greg Fretwell
candyman #199312 02/19/11 11:44 PM
Joined: May 2003
Posts: 1,157
Member

Page 1 of 2 1 2

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
RH1
RH1
California
Posts: 22
Joined: August 2009
Top Posters(30 Days)
NORCAL 3
grich 1
Popular Topics(Views)
288,000 Are you busy
220,121 Re: Forum
206,117 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5