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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, 6 months 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, 8 months 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, 7 months 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, 7 months 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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