Go Back  DoItYourself.com Community Forums > Heating, Cooling, Air Conditioning, Ventilation and T-Stat Controls > Thermostatic Controls
Reload this Page >

Honeywell wifi thermostat, do I need to steal G wire to C to get this working ?

Honeywell wifi thermostat, do I need to steal G wire to C to get this working ?


  #1  
Old 07-12-17, 05:28 PM
M
Member
Thread Starter
Join Date: Jul 2017
Posts: 2
Upvotes: 0
Received 0 Upvotes on 0 Posts
Honeywell wifi thermostat, do I need to steal G wire to C to get this working ?

Old Thermostat - White Rodgers 1F78
New thermostat - Honeywell WiFi RTH9580WF
Furnace - Distincions Amana (no clue what model, found manual which says MH95/ACSH96/AMEH96/GCH95/GME95/GCH9 Gas-Fired warm air furnace)

My old thermostat only has 4 wires coming in, and I need C wire for new themostat which I'm lacking.
Found googling that you can steal G wire, move it to C on furnace, and bridge G and Y together, while loosing manual fan ON option, which I never did, always set on Auto.

I also have HRV, which is on separate switch and wiring, not controlled by thermostat.
Whenever HRV is turned on, fan on furnace kicks in, would stealing the G wire mess with HRV and Furnace working together ?

Old thermostat


New thermostat


Furnace connections
 
  #2  
Old 07-12-17, 07:00 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 64,928
Received 3,949 Upvotes on 3,542 Posts
Welcome to the forums.

I see the black HRV lines on G and C.
Can you take a picture of the furnace board zoomed out so I can see the green wire connection?
 
  #3  
Old 07-13-17, 06:28 AM
M
Member
Thread Starter
Join Date: Jul 2017
Posts: 2
Upvotes: 0
Received 0 Upvotes on 0 Posts
Thanks, for reply, but I decided to just run a new wire, pretty easy as my furnace is right below thermostat.
Also my run is easy as it's a straight line down and basement is still unfinished.

 
  #4  
Old 07-13-17, 12:18 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 64,928
Received 3,949 Upvotes on 3,542 Posts
Run extra spares now while you can.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: