Honeywell WiFi thermostat RTH9580WF

Ross13

-I posted this in oil heat.  I should have posted here.



I have a 2 zone oil heat system.  I currently have LuxPro thermostats.  The three wires coming out of the wall are the following:

RED - connected to RH

WHITE - connected to W

GREEN - NOT USED (not shown in picture)

BLACK - Jumped between RH & RC



The new Honeywell WIFI thermostat states you need a "C" wire for power.  I went down to the Burhnam furnace to check Honeywell board and the GREEN wire is not connected to anything.  I also do not see anywhere on the board a "C" to connect to?



Any suggestions.  Attached are 3 pictures. In order, Honeywell control board @ the furnace, current LuxPro t-stat, & the new Honeywell t-stat.

SWEI

Which Burnham?

The wiring diagram will shed light on this.

Ross13

Burnham Model

Burnham model RS109T-TB  

Manufactured in 1998

JStar

WiFi

Install a switching relay with a Common terminal, ie: Honeywell R8845U.

Ross13

Switching relay

Ok, so replace the existing panel with a new R8845U?

Or I could always buy a Nest, which doesn't require a "C" wire, although I personally like the shape of the Honeywell vs. the round Nest.  I am not a heating guy so I will most likely hire a contractor to replace the relay if that is the only viable option, which it appears to be right now.



Thanks for your help!

SWEI

Can't make sense out of that number

but it's probably a component ID of some sort.  From what I can tell, it was probably part of a V-74.  As I write this, Burnham appears to be in the midst of rolling out a major website update and I can't find the manuals I know were there as recently as last week.  A competent contractor could no doubt locate a common terminal in there someplace, but it's not something I could recommend you take on yourself.