Nest E with Lennox heat pump.

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  #1  
Old 05-25-19, 06:27 PM
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Nest E with Lennox heat pump.

Hi, I've been searching for help with installing a Nest E I recently purchased but it seems there is no answer that fits everyone's situation.

Here is my system info:
Maker: Lennox
Model: E16Q4-20-1P
Thermostat Mode: 36G6901
*No humidifier (that I know of).

New Thermostat: Nest E

I hope I can get some support/advice, I'm in the middle of trying to return the Nest E, but I'd like to use it if it possible.

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Last edited by PJmax; 05-25-19 at 07:54 PM. Reason: resized pictures
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Old 05-25-19, 06:43 PM
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Old 05-25-19, 07:12 PM
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So from those notes your system should work with the Nest E

Reversing valve energized in cooling) :: Nest *OB -- Red (R)
Control power :: Nest R -- Blue (V)
Fan relay :: Nest G -- Green (F)
Compressor contactor :: Nest Y1 -- White (M)
Service light :: ??? -- Brown (L) - not used (tape off)
Ambient sensor/thermistor :: ???? -- (A) - not used (tape off)
Electric heat - Aux/Emergency :: Nest W1 -- Orange (Y)
Common RC :: Nest C -- Yellow (X)
:: ???? -- (E) - not used

Need to let Nest know you have a heat pump. Single fuel. So the *OB port is a O (activate on cooling) and W1 is Aux heat.
 
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Old 05-25-19, 07:55 PM
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Ahhhh..... yes. The confusing Lennox system.
 
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Old 05-25-19, 08:07 PM
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Throw the nest in the garbage.. worse t stat out there IMO. Cause multiple issues with units. Sometimes more often then not causing damage to HVAC units ..

These t stats are gimmicks
 
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Old 05-25-19, 08:14 PM
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You dont have a C wire....

https://thesmartcave.com/thermostat-c-wire-common/

Return that, IMO, piece of junk and get an ecobee if you want to be trendy..

Or get a honeywell and be trouble free...
 
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Old 05-25-19, 08:29 PM
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check out lennox HP 16 wiring.

https://www.askmehelpdesk.com/attach...6&d=1223673808
 
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Old 05-25-19, 08:30 PM
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I believe X is the C wire.. But im not sure... But get a different t stat please... Pete what you say???
 
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