frankstallone
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- Feb 2, 2018
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Bought a home with a nice HVAC setup. Everything is fairly new expect, what looks like, the original Lennox mercury based thermostats. I wanted to replace them with Nest Thermostats and have, but I am not 100% sure I got it right. Let me tell you what I have, upload some photos, and let me know what you think. I confirmed with Nest that their thermostats will work with the setup I have. Also if you think there's a better place for me to post this question, feel free to reach out and let me know.
* HVAC Setup *
** Larger Unit **
LENNOX ELITE XP13-036-230 - 3 TON, UP TO 14.2 SEER / 8.5 HSPF, 208 / 230 VOLT, SINGLE PHASE, R410A HEAT PUMP.
CBX27UH-042, Upflow/Horizontal, Air Handler, Multi-Speed, 3.5 Ton, Elite Series
** Small Unit **
LENNOX ELITE XP13-024-230, Heat Pump, 13 SEER, 2 Ton, R-410A, Elite Series.
CBX27UH-030, Upflow/Horizontal, Air Handler, Multi-Speed, 2.5 Ton, Elite Series.
The Lennox thermostats have _no_ model numbers. The best I could find was a sticker with LR1620 on it but Google only finds Honeywell thermostats with that number. Calling Lennox was no help. They told me to call a Lennox Certified Dealer.
Both thermostats have the same wires run to them (this is at the furnace):
** @ Furnaces **
R - RED,
R - ORANGE,
G - GREEN,
C - BROWN,
Y1 - WHITE,
W1 - YELLOW,
O - BLUE
Then there is another wiring loom that goes to the same motherboard out to the heat pumps. For instance, R is jumped to the RED cable that goes outside.
** @ Nest thermostat **
Y1 - YELLOW,
G - GREEN,
OB - BLUE,
RC - RED,
W2 - WHITE
C - BROWN
** Photos of Thermostats **
* HVAC Setup *
** Larger Unit **
LENNOX ELITE XP13-036-230 - 3 TON, UP TO 14.2 SEER / 8.5 HSPF, 208 / 230 VOLT, SINGLE PHASE, R410A HEAT PUMP.
CBX27UH-042, Upflow/Horizontal, Air Handler, Multi-Speed, 3.5 Ton, Elite Series
** Small Unit **
LENNOX ELITE XP13-024-230, Heat Pump, 13 SEER, 2 Ton, R-410A, Elite Series.
CBX27UH-030, Upflow/Horizontal, Air Handler, Multi-Speed, 2.5 Ton, Elite Series.
The Lennox thermostats have _no_ model numbers. The best I could find was a sticker with LR1620 on it but Google only finds Honeywell thermostats with that number. Calling Lennox was no help. They told me to call a Lennox Certified Dealer.
Both thermostats have the same wires run to them (this is at the furnace):
** @ Furnaces **
R - RED,
R - ORANGE,
G - GREEN,
C - BROWN,
Y1 - WHITE,
W1 - YELLOW,
O - BLUE
Then there is another wiring loom that goes to the same motherboard out to the heat pumps. For instance, R is jumped to the RED cable that goes outside.
** @ Nest thermostat **
Y1 - YELLOW,
G - GREEN,
OB - BLUE,
RC - RED,
W2 - WHITE
C - BROWN
** Photos of Thermostats **