Forums | Home Repair | Home Improvement | Painting | Interior Decorating | Remodeling | Landscaping


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

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 07-06-2013, 09:37 PM   #1
Member
 
angelatc's Avatar
 
Join Date: Jun 2012
Location: Linden, MI
Posts: 75
Share |
Default

Help w/ t-stat / low voltage wiring?


When i bought this house the t-stat wiring was a mess. It is easy to access so I decided to replace it.

I don't want to waste a lot of words on the problems, rather than figure out what was spliced where, i though i would just rewire it and be done with it.

I thought i had it all figured out, but i got myself confused when i took the t-stat off.

The board in the furnace has 5 screws; R, W, Y, G, C. So I ran 18/5.

The Thermostat has 5 screws; Rh, Rc, Y, W, G

The connection diagram shows 4 wires (R,W,Y,G) running to the t-stat. The condenser is shown wired to Y and C.

I think now that I did not need 18/5, and that I should only use 4 wires, jumping the Rc and Rh at the thermostat.

Does that seem right?
angelatc is offline   Reply With Quote
Old 07-06-2013, 09:54 PM   #2
Newbie
 
Join Date: May 2013
Posts: 2
Default

Help w/ t-stat / low voltage wiring?


You have an extra wire for now. Don't cut it off, you will need it if you ever upgrade to a thermostat that needs a power supply. Just wind it around the others. The condenser has to have the "c" wire to one side of the contactor, and the yellow from the thermostat to the other.

Dogear
Dogear is offline   Reply With Quote
The Following User Says Thank You to Dogear For This Useful Post:
angelatc (07-06-2013)
Old 07-06-2013, 10:11 PM   #3
Newbie
 
Join Date: May 2013
Posts: 2
Default

Help w/ t-stat / low voltage wiring?


You're welcome. I should have mentioned that the "c" and yellow wires go to the coil on the contactor.

Dogear
Dogear is offline   Reply With Quote
Old 07-07-2013, 12:13 PM   #4
Member
 
angelatc's Avatar
 
Join Date: Jun 2012
Location: Linden, MI
Posts: 75
Default

Help w/ t-stat / low voltage wiring?


well, that didn't seem to work. i don't think i have any low voltage anywhere. I took the thermostat off, and put a volt meter between red and every other color, and got nothing.

Then I went to the furnace and did the same thing at the control board, and still got no low voltage anywhere.

What should i check next?
angelatc is offline   Reply With Quote
Old 07-07-2013, 12:50 PM   #5
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 23,474
Default

Help w/ t-stat / low voltage wiring?


Look for blown fuse. Or a bad transformer.
__________________
When posting in certain forums, knowing your location will help others give better feedback/advice/solutions to your questions.
beenthere is offline   Reply With Quote
The Following User Says Thank You to beenthere For This Useful Post:
angelatc (07-07-2013)
Old 07-07-2013, 01:57 PM   #6
Member
 
angelatc's Avatar
 
Join Date: Jun 2012
Location: Linden, MI
Posts: 75
Default

Help w/ t-stat / low voltage wiring?


Thank you beenthere. You are right - there is a small 5a fuse in the path, and it is open. Off to the store now.

edited to add - WOOT! blowing cold air!!!! Thanks so much to both of you!!!

Last edited by angelatc; 07-07-2013 at 04:55 PM.
angelatc is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Help: Wiring Fan in equip closet, using stat and switch cdika17 Electrical 4 11-02-2012 02:52 PM
Wiring a Line Voltage Thermostat for Fan Forced Heaters shumatec Electrical 7 11-10-2011 08:50 PM
Low voltage wiring Reddhead Electrical 2 09-12-2010 10:23 AM
Line Voltage Thermostat Wiring bswigart Electrical 10 11-24-2009 07:10 PM
Old Low Voltage Wiring srwjr Electrical 14 01-24-2007 07:29 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.