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Question About Lennox International Inc. Thermostat T90H110A137
I have old Lennox thermostat T90H110A137 and i wan...

I have old Lennox thermostat T90H110A137 and i want to connect new Honeywell thermostat PRO3000. How i connect the wires

Asked by Chris on 04/18/2013 3  Answers

ManualsOnline posted an answer 11 years ago

The ManualsOnline team has found the manual for this product! We hope it helps solve your problem. Get the Manual Here

Ciaran posted an answer 9 years, 1 month ago

5 T-90H110A137 I know this post is old, but I just replaced this same unit successfully, so I figured I'd get some karma out of it and make it easy for anyone else looking. Just to clarify, it's an ITT General Controls" thermostat, model T-90H110A137, 24 volts max, 0.8 AMP. I have a forced air heat and cooling system, which is also Lennox. The main issue is the letters/labeling for each terminal does match "modern" standards. In addition, my wiring did match the colors either, so it was a combination of research and guesswork to get it to work. (Two disclosures: I'm not a professional as this is the first thermostat I've replaced and I changed this is March, so I didn't run the A/C for long.) You can probably ignore the wire colors (in parentheses) but I included them just in case. Old Lennox - (Wire color) - New Thermostat - [Function/what it does] G - (Orange) - C - [Ground] F - (Blue) - G - [Fan] C - (White) - Y - [Cooling/Compressor] H - (Green) - W - [Heat] V - (Red) - RcRh - [Power/Voltage] Looking at the old labeling, it makes a lot more sense since the letters actual mean something.
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Sams posted an answer 9 years ago

0 Thanks bud, your info is really helpful. I just moved into a place where they had the old T-90H110A137 and going to replace it with ecobee similar to nest but better according to reviews
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Sams posted an answer 9 years ago

0 Apparently my wiring is different in colors and is as follows V Black H yellow C red F green ( Same green color was going to both) G green ( Same green color was going to both) Can you please help out
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