Nest Learning Thermostat 1st Generation
Nest Learning Thermostat 1st Generation
Nest Learning Thermostat 1st Generation
Nest Learning Thermostat 1st Generation
Conventional connectors
Conventional connectors
Heat pump connectors
Heat pump connectors
Rh
24VAC power from heating transformer*
Rh
24VAC power from heating transformer*
W1
Stage 1 heat relay
W1
Not usually used
Y1
Stage 1 cooling compressor relay
Y1
Stage 1 compressor contact
G
Fan relay
G
Fan relay
C
24VAC common wire.
C
24VAC common wire.
O/B
Not used
O/B
Changeover valve
AUX/W2
Stage 2 heat relay
AUX/
W2
Auxiliary heat relay
Rc
24VAC power from cooling transformer*
Rc
24VAC power from cooling transformer*
* No jumper wires required. You don’t need to hang on to any old jumper wires going from Rh (sometimes
just called R) to Rc. Nest will automatically jump these two connectors.
Nest Learning Thermostat installation & configuration guide
Page 7
