How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask #1 Expert Your Own Question

#1 Expert
#1 Expert, Handyman
Category: Home Improvement
Satisfied Customers: 282
Experience:  Handyman 40+ years - Gardener for 50+ years - Homeowner 40+ years - Internet Researcher
1146604
Type Your Home Improvement Question Here...
#1 Expert is online now
A new question is answered every 9 seconds

gas furnace rewire for fan only operation

Customer Question

how do i rewire my gas furnace so i can manually turn the fan on in the summer for air circulation?
Submitted: 8 years ago.
Category: Home Improvement
Expert:  Glenn replied 8 years ago.

Hello


Can you supply the make and model number ?

Customer: replied 8 years ago.
Reply to glenn's Post: Glenn,

it is a Rheem Criterion with the jets on the bottom and squirrel cage fan on top.

Bud
Expert:  Glenn replied 8 years ago.

Hey Bud


Do you wanna just make this blow air >??

Customer: replied 8 years ago.
Reply to glenn's Post: Yup. Here in NW Washington, we have a normal, unairconditioned home. For the 2.5 months of warm weather, it would be nice to just get the fan to blow to circulate air. Lots more secure than leaving windows open and unlocked when we are not home.

Bud
Expert:  Glenn replied 8 years ago.

Hello


Not really sure but have you tried disconnecting the gas valve


Some of these units require a certain temp before turning the fan on

Customer: replied 8 years ago.
Reply to glenn's Post: Hmmmm. Not sure how disconnecting the gas valve will help. What I wan to do is to wire the fan motor into the thermostat to allow the "fan on" to turn on the fan.
Expert:  #1 Expert replied 8 years ago.

HiCustomer Thank you for asking your question on Just Answer. The other experts and I are working on your answer. By the way, it would help us to know:

-Is your furnace a Rheem Criterion or the Rheem Criterion II ?


-Do you normally shut off you pilot light in the summer?

Thank you again for trusting us with your problem. Please reply as soon as possible so that we can finish answering your question.







Expert:  Glenn replied 8 years ago.

Hello again Bud


I'm shure the fan will not come on before it knows there is heat


Do you want to make a connection on the blower and dissconnect it from the unit and put a plug on it so you can plug it in ?

Customer: replied 8 years ago.
it is the criterion...not the criterion II (at least there is nothing listing it as a II).

we do not shut off the pilot...there is no pilot. the ignition is via a heater coil...i just changed it out this past year.

bud
Expert:  #1 Expert replied 8 years ago.

Due to the age of the furnace, I do not have the manual available, but I an tell you that the fire box has a thermostat controlled switch, that turns the fan on when the fire box temperature gets to a certain temperature.


This plenum thermostat, does the same function as an on and off toggle switch except it is temperature controlled.


Warning: Do not attempt this unless you have some basic electric knowledge. The voltages inside your furnace can cause sever shock and or death. Only open the furnace with the power turned off.


This plenum thermostat is normally enclosed in a sheet metal box. When you remove the box's cover to gain access, you will see a calibration knob.


Do not touch this control. It is factory set and could cause your furnace to get to hot if adjusted incorrectly.


Turning it could also cause your furnace not to work unless the thermostat switch was replaced.


If you look closely you will see 2 power wires going to the plenum thermostat and another brass looking tube going to the fire box, or the box it's self can be in front of the box with a large tube going into the fire box.


One of these wires will show hot and one will show no voltage. Put a toggle switch to allow it to connect these two wires and your fan will run.


Turn the toggle switch off and the plenum thermostat will control the fan.


These instructions are generic in nature and may or may not describe your furnace. I believe I have supplied enough information for you to do this modification to your furnace


More questions? Just ask.

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
< Last | Next >
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
  • Thank you for the expeditious answer. It's good to know you're out there and awake in the wee hours when I finally have time to ask questions about my Jenn Air. Jean Riverhead, NY
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
 
 
 

Meet The Experts:

 
 
 
  • The Home Smithy

    Home Builder

    Satisfied Customers:

    2002
    #1 Home Improvement Expert 30+ years experience
< Last | Next >
  • http://ww2.justanswer.com/uploads/TH/TheHomeSmithy/2011-8-13_11146_homesmithy.500x500.64x64.jpg The Home Smithy's Avatar

    The Home Smithy

    Home Builder

    Satisfied Customers:

    2002
    #1 Home Improvement Expert 30+ years experience
  • http://ww2.justanswer.com/uploads/BS/bshull17/2011-2-11_04125_japic.64x64.JPG Brian's Avatar

    Brian

    Architect

    Satisfied Customers:

    1967
    Licensed Architect- 16 years, L.E.E.D. AP
  • http://ww2.justanswer.com/uploads/ST/Steve555/2013-6-14_144343_Depositphotos4247517S.64x64.jpg Steve G.'s Avatar

    Steve G.

    Handyman

    Satisfied Customers:

    135
    VP of electronic repair company and home theater advisor.
  • http://ww2.justanswer.com/uploads/ER/Erdaram/2011-6-21_14724_ANIEric4Pics.64x64.gif Eric M. Bright's Avatar

    Eric M. Bright

    We Don't Comprehend the Word Can't!

    Satisfied Customers:

    1734
    I've been been doing things for my clients that others have said cant be done for over a 1/4 Century
  • http://ww2.justanswer.com/uploads/rich03dungo/2010-3-17_101556_tshirt2.jpg Rich's Avatar

    Rich

    Home Improvement Enthusiast

    Satisfied Customers:

    674
    Over 35 years construction and home maintenance experience
  • http://ww2.justanswer.com/uploads/AL/alumalite/2012-5-10_234018_shutterstock506249951forJA500.64x64.jpg Phil's Avatar

    Phil

    Mechanical Engineer

    Satisfied Customers:

    409
    Retired contractor, 51 years experience
  • http://ww2.justanswer.com/uploads/JE/jerrymassie/2011-1-15_45937_1111055.64x64.JPG Jerry's Avatar

    Jerry

    hearth products

    Satisfied Customers:

    317
    owned and operated stove retail and service 12 yrs
 
 
 
Chat Now With A Home Improvement Expert
#1 Expert
#1 Expert
100 Satisfied Customers
Handyman 40+ years - Gardener for 50+ years - Homeowner 40+ years - Internet Researcher