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Wire a Attic Exhaust Fan to a Thermostat Control

Wiring a Attic Exhaust Fan Electrical Question: How can I  control an attic fan (120 volt) with 2 wires (black and white) with a regular 24 volt thermostat. I am having an issue with how to wire a White Rodgers Emerson model # 90 113 SPDT Relay which is mounted to a 4×4 box. How […]


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Generator Automatic Transfer Switch
and Electric Circuit Sub Panel

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Wiring a Attic Exhaust Fan

Electrical Question: How can I  control an attic fan (120 volt) with 2 wires (black and white) with a regular 24 volt thermostat. I am having an issue with how to wire a White Rodgers Emerson model # 90 113 SPDT Relay which is mounted to a 4×4 box.

How to Wire Attic Exhaust Fan

Lou asks:
I am trying to control an attic fan (120 volt) with 2 wires (black and white) with a regular 24 volt thermostat.
I am hving issue with how to wire White Rodgers Emerson model # 90 113 SPDT relay which is mounted to a 4×4 box.
I have 18 4 thermostat wire along with 12 2 wire for power and the 2 attic fan wires (black and white) connected to 4×4 box.
I have 5 wires coming from SPDT, (2 Black with 1 of black marked common, white, red, and brown).
I was told by rep from Emerson that white wire from SPDT was the hot wire.
I just need to know where to connect which wires to SPDT.
Thank you for your help.

This electrical wiring question came from Lou in Staten Island, Texas.

Dave’s Reply:

Thanks for your electrical wiring question Lou.

How to Wire a Attic Exhaust Fan

Application: How to Wire a Attic Exhaust Fan.
Skill Level: Intermediate to Advanced – Best performed by a Licensed Electrical Contractor, or Licensed HVAC Contractor.
Electrical Tools Required: Basic Electricians Pouch Hand Tools, Voltage Tester, and appropriate Safety Gear.
Estimated Time: Depends on the personal level experience, ability to work with tools, install electrical circuit wiring, and the available access to the project area.
Electrical Safety: Identify the electrical power source to the Attic Exhaust Fan, turn it OFF and Tag with a Note before working with the electrical wiring.
Electrical Wiring Parts and Materials: Electrical parts and materials for the Attic Exhaust Fan should be approved for the specific project and compliant with local and national electrical codes.
Electrical Codes and Inspections: Installing or changing home electrical wiring should be done according to local and national electrical codes as adopted in Staten Island, Texas. A permit and inspections may also be required.

How to Wire a Attic Exhaust Fan in a Attic

This electrical wiring project is about How to Wire a Attic Exhaust Fan to a thermostat and control relay.
attic fan control

Attic Exhaust Fan Thermostat Control Wiring

attic fan thermostat

Attic Exhaust Fan Thermostat and Control Relay

basic control circuit

A Basic Control Circuit

The Following Resources may Assist You with this Question:
Installing Attic Electrical Wiring
Is it standard for electrical wiring to be strung in a disorderly fashion in the attic? Methods of Proper Attic Electrical Wiring.
Install an Attic Exhaust Fan to Help Cool Your Home
I want to install attic fans to help cool my house and reduce my electric bill, what do you recommend? Here are some considerations when Selecting and Installing an Exhaust Fan to Help Cool Your Attic and Your Home.
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How to Store Unused Electrical Wires: Is it safe to leave live wires capped in switch box covered by flat plate?
Installing Attic Electrical Wiring
Is it standard for electrical wiring to be strung in a disorderly fashion in the attic? Methods of Proper Attic Electrical Wiring.
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I am installing a whole house fan that runs on 120v 250 watts max. The fan comes with 2 grounded plugs, 1 to fan, one to damper system to simply plug into an existing outlet in the attic…

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Understanding electrical junction boxes and what they are used for. Home electrical wiring is the process of installing electrical wire to a location that will serve electrical devices or an appliance. One very important component is the box where the wire will be installed. The type and size of the home wiring electrical boxes will depend upon the circuit size, application and its location.

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How to Wire a GFCI Outlet

without a Ground Wire

NOTE: A List of All my Helpful Videos
Will Display at the End of This Video
Keep Watching So I Can Help You Wire it Right!

Check out my YouTube Channel:
» AskTheElectrician «
and Subscribe!

Learn more about Home Electrical Wiring
with my Online Video Course:
Basic Home Electrical Wiring by Example

Dave's Guide to Home Electrical Wiring:

» You Can Avoid Costly Mistakes! «

Here's How to Do It:
Wire It Right with the help of my Illustrated Wiring Book

Great for any Home Wiring Project.
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Complete Guide to Home Electrical Wiring

Perfect for Homeowners, Students,
Handyman, Handy Women, and Electricians
Includes:
Wiring GFCI Outlets
Wiring Home Electric Circuits
120 Volt and 240 Volt Outlet Circuits
Wiring Light Switches
Wiring 3-Wire and 4-Wire Electric Range
Wiring 3-Wire and 4-Wire Dryer Cord and Dryer Outlet
How to Troubleshoot and Repair Electrical Wiring
Wiring Methods for Upgrading Electrical Wiring
NEC Codes for Home Electrical Wiring
....and much more.



Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.

Electrical Tips to Help You Wire it Right

The Safest Way to Test Electrical Devices and Identify Electric Wires!

The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester that I use to easily Detect Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.

The Quickest Way to Check for Faulty Electrical Wiring!

The Plug-In Outlet Tester
This is the first tool I grab to troubleshoot a problem with outlet circuit wiring. This popular tester is also used by most inspectors to test for power and check the polarity of circuit wiring.
It detects probable improper wiring conditions in standard 110-125 VAC outlets Provides 6 probable wiring conditions that are quick and easy to read for ultimate efficiency Lights indicate if wiring is correct and indicator light chart is included Tests standard 3-wire outlets UL Listed Light indicates if wiring is incorrect Very handy and easy to use.

Strip Off Wire Insulation without Nicking and Damaging the Electric Wire!

The Wire Stripper and Wire Cutter
My absolute favorite wire stripping tool that I have had in my personal electrical tool pouch for years, and this is the tool I use to safely strip electrical wires.
This handy tool has multiple uses:
The wire gauges are shown on the side of the tool so you know which slot to use for stripping insulation.
The end of the tool can be used to grip and bend wire which is handy for attaching wire onto the screw terminals of switches and outlets..

The wire stripper will work on both solid and stranded wire. This tool is Very Handy and Easy to Use.


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