nest Learning thermostat Installation And Configuration Manual page 9

Nest Learning Thermostat 1st Generation Nest Learning Thermostat 1st Generation Nest Learning Thermostat 1st Generation Nest Learning Thermostat 1st Generation
Conventional connectors Conventional connectors
Rh 24VAC power from heating transformer*
W1 Stage 1 heat relay
Y1 Stage 1 cooling compressor relay
G Fan relay
C 24VAC common wire.
O/B Not used
AUX/W2 Stage 2 heat relay
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
Heat pump connectors Heat pump connectors
Rh 24VAC power from heating transformer*
W1 Not usually used
Y1 Stage 1 compressor contact
G Fan relay
C 24VAC common wire.
O/B Changeover valve
AUX/
Auxiliary heat relay
W2
Rc 24VAC power from cooling transformer*
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