Supported Wiring - nest Learning thermostat Installation And Configuration Manual

Supported wiring

Nest Learning Thermostat 2nd Generation Nest Learning Thermostat 2nd Generation Nest Learning Thermostat 2nd Generation Nest Learning Thermostat 2nd Generation
Conventional connectors Conventional connectors
Y1 Stage 1 compressor relay
Y2 Stage 2 compressor relay
G Fan relay
O/B Not used
Rc 24VAC power from cooling transformer*
W1 Stage 1 heat relay
W2/AUX Stage 2 heat relay
C 24VAC common wire.
* Stage 3 heat (W3), humidification (HUM), or
dehumidification (DEHUM)
Rh 24VAC power from heating 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
Y1 Stage 1 compressor relay
Y2 Stage 2 compressor relay
G Fan relay
O/B Changeover valve relay
Rc Not used
W1 Stage 1 heat relay
W2/AUX Auxiliary heat relay
C 24VAC common wire.
* Emergency heat (E), humidification (HUM), or
dehumidification (DEHUM)
Rh 24VAC power from transformer*
Page 6