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ATTIC FAN WIRING

HOW DO YOU WIRE AN ATTIC FAN WITH A TIMER

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I want to replace our old carling toggle switch to a new timer switch for an attic fan. I have 2 black wires and one red. My new switch has one black one red and one green wire.....what do I do?


Is the fan 2-speed?
Old switch has 2 black and 1 red... sounds like 2-speed.
One black is probably Hot, and other black and red go to each speed??
Choose 1 speed and wire timer as follows:
http://waterheatertimer.org/How-to-wire-timers.html
Add a comment with more details about the timer you are using, and include if fan is 2-speed and what each wire tests.

Jul 30, 2013 | Electrical Supplies

1 Answer

Wiring problem


11-1-12
Thanks for link to manual.
Solution might take more response for full clarity, and you seem a good electrician.
I have numbered two questions that may be unimportant.
Add a comment, response after 5 pm CST

Here is illustration showing Black Hot and White Neutral in attic junction box, as you described. With black-red-blue wires connected as shown in Broan manual. And each device connected to White neutral wire in junction box.
http://waterheatertimer.org/images/Triple-fan-light-night-light.jpg

You have access to attic, and can drop another cable down wall into switch box. This will give necessary total 4 wires between switch and Broan
http://waterheatertimer.org/OWB1.html

Key start point: Junction box in attic has the Black Hot wire and White neutral coming from circuit breaker box.
This cable powers the junction box.

There are 3 cables in junction box, each cable with black and white.
Cable from breaker box with Hot and Neutral. Cable going to light switch.
Another cable jumps power to next box in the circuit, and will be reconnected when finished, black-to-black white-to-white

Old light switch in wall was single pole.
1) How many cables are inside switch box? Just one cable from attic with black and white wire?
2) 3-way switch is the wrong switch, unless you mean 3-pole triple switch with 3 screw terminals on one side of device?

Here is another link that shows wiring choices if you decide to use 3 separate switches (or timers or occupancy sensor to turn on night light) instead of triple switch: Install triple box.
http://waterheatertimer.org/How-to-wire-switches.html#4-f

Oct 31, 2012 | Broan-NuTone Dryers

1 Answer

Wiring a master flow PT6 thermostat to attic fan


I had a roofer install Master Flow PRO 3 and he did the initial wiring incorrectly. The black wire pairs were incorrectly connected and caused the fan to run 24-hours. I switched the black wires pairings and the fan shuts off if less than 100-degrees (the setting I chose) and comes on if more than 100-degrees. You may want to be sure that the black wire from the power source is connected to the black wire for the thermostat (black wire nearest the thermostat setting switch and closest to the power source wire). The black wire from the fan motor should be connected to the black wire closest to the fan motor's wire.

Aug 01, 2012 | Cars & Trucks

1 Answer

We have a fan 60 minute push button timer we purchased and installed with a 3-wire system. WE need to purchase another one but they all have 4 wires now. Where can we purchase a 3-wire one.


It sounds like you have mechanical push-button type timer.
I need more information to avoid guessing which timer is best for your situation.

I'm not sure what a 3-wire system is?
Add a comment
1) How many switches control same fan
2) What color wires inside box.

Is this
3) low-horsepower bathroom fan?
4) other fan, for example: higher horsepower attic fan, 3/4 horsepower industrial kitchen fan, or 1-horsepower whole house fan?
5) Is this your home or is fan for continual commercial use?

6) Is this a countdown timer that turns fan OFF automatically after 60 minutes?
7) Or what kind of timer are you looking for.

Open following link for list of home-use countdown timers and horsepower ratings of countdown timers.
http://waterheatertimer.org/Countdown-timer-horsepower-ratings.html

Spring-wound timers do not require extra Neutral wire, and can control 1 HP whole-house fan.
The push-button timers each require Neutral wire to run electronics inside timer, and they range from 1/6 HP to 3/4 HP which will work for any bathroom fan.

If you cannot give required information for more free help, then request fixya interactive answer and pay fixya expert to ask same questions while expert supplies you with immediate information.

Apr 06, 2011 | Woods 60 Minute Decorator Wall Timer...

1 Answer

I am trying to replace an old spring loaded attic fan timer. The old time simply had a black line in and a black line out. There was both a white and red line capped off in the box along with a bare...


The timer is wired differently than the old spring-loaded timer.
This is because the timer has an electronic clock instead of a spring.
The electronic clock needs power just like an alarm clock.
The white wire powers the clock.

Here's the wiring.
Black-timer wire connects to Hot-wire-from-breaker
Red-timer connects to Load (attic fan)
White-timer connects to white Neutral
In absence of a Neutral, connect white-timer to bare ground.

If you have your black-timer and red-timer wires reversed, it might cause the symptoms you describe.
Simply reverse the black-timer and red-timer.

If you want to test your wires to make certain:
Remove timer.
Separate wires for testing.
Turn on power.
Use ordinary tester.
Tape tester leads to wood sticks to keep hands away.
Power is ON.
Test each wire to bare ground wire.
When tester lights up, that is hot-wire-from-breaker.
Now test hot-wire to each of the other wires (except ground)
When tester lights up, that is Neutral
Not every switch box will has a Neutral
In that case white-timer connects to ground

Nov 08, 2010 | GE 60minute Automatic ShutOff Timer Switch...

1 Answer

I am installing a intilitech 7 day in wall timer replacing an old mechanical 12 hr timer. The load is a 1/4hp 2 speed attic fan. The original wiring had hot in hot out of the timer. This has hot in, hot...


Utilitec does not make a 2 speed timer.
http://waterheatertimer.org/Program-wire-Utilitech-LW60419.html

1) One possible option is a timer with NO and NC terminals like Intermatic-Grasslin FM1 series rated 1 HP. This example timer would have the motor running continually on either one speed or the other.
http://www.intermatic.com/~/media/files/intermatic/products/instructions/grasslin/fm1%20series%20time%20switches.ashx

2) Inside a 2-speed motor are two separate windings.
Windings are loops of copper wire that cause the fan motor to rotate.
For 2-speed, each winding has to be connected to a different 'switch.'
For example, like a ceiling fan. You pull the chain once, and electricity flows to one winding. Pull the chain again, and the switch sends electricity to another winding.

3) The following wiring diagram shows ordinary on-off timer connected to 2-speed switch: This is the basic plan for Broan Nutone 2-speed switch timer, which might be the product you are replacing
http://blog.airscapefans.com/wp-content/uploads//timer_option1_1-1024x768.jpg

4) Nutone makes a 2-speed whole house fan timer.
http://www.nutone.com/PDF/InstallGuides/CFS2WHins89777.pdf

5) And open following Broan Nutone manual that show the two spped timer wiring
http://www.nutone.com/PDF/InstallGuides/CFS2ins57169.pdf

Jul 01, 2010 | Intermatic Inc. ST01C Digital In-Wall...

1 Answer

OLD wall timer Model E1020 ticks really loud


You probably can't get the existing mechanical timer to operate any quietier, since it's old and likely starting to wear out. You can either swap the timer out for a new automatic digital timer, or install a standard single pole switch in its' place.

I believe the code you refer to regarding the fan having to be wired onto a timer switch was a local requirement from many years ago.

Some local jurisdictions have impossed more stringent requirements, but frankly, having an exhaust fan is normally a good idea. If the fan is vented into the attic space, it can cause some serious problems in cold weather with condesation of the warm, moist exhaust air.

Building Code requires that bath fans be piped/vented to the outside of the house and not into the attic space.

There are newer preset timer switches that will turn on the exhaust fan for a fixed amount of time, based on which button you push. These are great as they will run the fan long enough to remove condensation from showers, etc.

If you're going to replace the timer, disconnect or turn off the breaker or power to the switch. Then simply install a new timer or switch by connecting the black supply wire to the bottom of the single pole switch, or to one of the black leads of the timer. Then connect the black wire going to the fan to the top screw on the single pole switch, or the other lead on the new timer. The white (neutral) wires should already be connected with a wire nut inside the box. Connect the ground wire to the ground wire in the box and if the switch box is metal, attach the ground wire to the box with a green grounding screw too.

You can now operate the fan with either a manual on/off switch or the new digital timer, whichever you chose to install.

Sep 04, 2009 | Heavy Duty Intermatic Wall Switch Timer...

3 Answers

Dayton Attic fan running backwards


First see if the switch has a reverse position. Sometimes you turn the fan assembly in the frame, sometimes you turn the whole frame around. Take the cover off the wiring compartment to see if there are instructions there. Also check on the name plate on the motor, there may be instructions there. Attic fans are usually engineered to blow out.

Aug 02, 2008 | Dayton (2C373) Fan

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