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 09-20-2009, 10:57 AM   #1
Newbie
 
Join Date: Sep 2009
Posts: 3
Share |
Unhappy

3 wire thermostat


I am trying to replace a broken thermostat. It is a 3 wire White Rogers, one of three zones to a hot water boiler heating system. One wire is red, one is blue, and the last is white. Every thermostat (programmable) I buy has slots for 4 wires. Can I leave a slot open? I don't have a cooling system.

shadow82399 is offline   Reply With Quote
Old 09-20-2009, 03:29 PM   #2
Member
 
Join Date: Dec 2008
Location: West Michigan
Posts: 440
Default

3 wire thermostat


For a three wire zone valve, the stat needs to have a contact that closes when when the call for heat is complete. The zone valves power open with a call for heat and power closed when the call for heat is satisfied. The average 4 wire digital heat and cool stat will not work for this application. There are some that will accomplish this but are usually more high end.

SKIP4661 is offline   Reply With Quote
Old 09-20-2009, 04:30 PM   #3
Newbie
 
Join Date: Sep 2009
Posts: 3
Default

3 wire thermostat


So what can I replace the thermostat with? One is completely shot, the others are just really old and I would like them updated.
shadow82399 is offline   Reply With Quote
Old 09-20-2009, 07:37 PM   #4
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 24,735
Default

3 wire thermostat


White Rodgers has stats that you can use. Don't remember the mod numbers off hand.
You may want to search their website.
beenthere is offline   Reply With Quote
Reply

Tags
3-wire, heat, thermostat


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
Two Wire 24V Thermostat to Digital Thermostat on Pellet Stove jrodtaclet Electrical 4 09-15-2009 05:37 PM
Which thermostat and how to wire it! woodworker2 HVAC 1 09-18-2008 08:18 PM
X wire on old thermostat Jellybean HVAC 3 03-30-2008 07:14 AM
Stranded wire on screw connections BigJimmy Electrical 7 01-19-2008 02:42 PM
Tie-in of a Coleman electric furnace nilo HVAC 9 01-03-2007 03:45 PM




Top of Page | View New Posts

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