Central Exhaust Fan - Electrical - DIY Chatroom Home Improvement Forum
Advertisement


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools
Display Modes
Old 01-10-2010, 10:09 AM   #1
Newbie
 
Join Date: Jan 2010
Location: Severna Park, MD
Posts: 16
Rewards Points: 10
Default

Central exhaust fan


Hi,

I need advice on wiring a 7 button electronic timer sw to control a central exhaust fan in one bathroom and a single pole operate the same fan in another. I have since "blown" a $30 electronic sw.
The electronic sw has a "red" lead for the load (fan) and black for hot source, a neutral, and grd. The red is connected to a black sw wire at the fan, the white to the neutral. This should control the fan for B/R "A". In bathroom "B", I have only room for a shallow box and single pole sw. It breaks power to the fan through the Black sw wire, as well.
Now, if the Fan is on in B/R "A" and the timer is is on in B/R "B", as well, could there be an issue with the electronic due to the same potential being applied from another pwr. source?
Thanks!
SilverBullit is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 01-10-2010, 01:44 PM   #2
Electrical Contractor
 
kbsparky's Avatar
 
Join Date: Sep 2008
Location: Delmarva
Posts: 3,368
Rewards Points: 2,000
Default


There shouldn't. Can you clarify exactly how you wired these switches to "blow" your timer?
__________________
-KB

Life is uncertain -- eat dessert first!!
kbsparky is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 01-10-2010, 02:34 PM   #3
Member
 
Join Date: Sep 2008
Location: Oregon
Posts: 1,497
Rewards Points: 500
Default


The fan, timer switch, and the single pole switch should all be on the same circuit / breaker.

You could be supplying 240 volts if on separate breakers - a random chance thing.

And motors can place all sorts of electrical "noise" on electric wires. This can "fry" electronic gizmos. Be sure the electronic timer can be used for electric motors / fans. Read all the warnings in the instructions for the timer.

Then sometimes "back feeding" power to the output of an electronic device can fry it. This would be via the 2nd single pole switch.

All sorts of possible problems! So what to do?

The best way to troubleshoot a problem such as this is to isolate the trouble.

1st be sure everything is on the same circuit and circuit breaker.

Then install a regular single pole switch where the timer goes. Get the basic fan and both switches working. Then you know the fan, circuits, wiring, and switches all work ok and everything is installed ok.

Then this would leave just the timer. Install the timer again. If there are problems, then you would know it was just the timer and not anything else.

The timer can be "isolated" from electrical noise from the fan or back feeding of power from the other switch with the use of a "contactor" which is a relay. More on this...

How relays work...
http://www.google.com/search?hl=en&s...h&aq=f&oq=&aqi=
Billy_Bob is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Central-vac exhaust curls00 General DIY Discussions 4 03-09-2008 12:28 PM
Can I T my new dryer's exhaust into my bathrooms exhaust? Felipon Appliances 2 01-30-2008 06:53 PM
Complex challenge with bath exhaust fan - need help with solution! Honest Bill Electrical 6 11-02-2007 02:52 PM
Furnace Exhaust To Outdoors celticFC HVAC 1 09-01-2007 01:27 PM




Top of Page | View New Posts