Thermostat and Furnace Wiring - http://www.hvacmechanic.com/ Forums
Original message
| CharlieSmith
|  "Thermostat and Furnace Wiring"
, posted Sat 8 Nov 18:12:  
I’m trying to install a new thermostat and replace the thermostat wiring in my recently purchased old house (it's a fixer-upper built around 1900 and updated in the 1950s/1960s). The furnace is an old (exact age unknown, but there’s a service tag marked 1964 on it) American Standard oil-fired hot-water system. It still has a few more years of useful life left in it. The current thermostat works, but not very well - it's difficult to use and the thermometer's accuracy is questionable at best. The current wiring is cloth-wrapped and deteriorating. The thermostat wiring on the furnace has three wires and two terminals. The wires are not color coded, and the terminals are not labelled. I can’t very well match up the old wiring with the new to replace it. My problem, then, is figuring out how to wire the thermostat into the furnace. Any suggestions? I can provide pictures of the furnace, if that would help. I’m planning to use a Honeywell thermostat, model CT87A.
Much appreciated,
Charlie
[this message was edited by CharlieSmith on Sat 8 Nov 18:13] |
| Replies:
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| Xenos
Webmaster 
|  "Re(1):Thermostat and Furnace Wiring"
, posted Sat 8 Nov 19:22
The question you need to answer is where do they connect on the thermostat now. It’s possibly the same terminals.
Xenos.
The best way to escape a problem is to solve it.
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