Home > Nest > Google Nest Learning Thermostat (4th gen) Installation Guide

Google Nest Learning Thermostat (4th gen) Installation Guide

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Installation Overview - Terminal Overview

Conventional Connectors

Heat Pump with Aux

Heat Connectors

Heat Pump with Dual

Fuel Connectors

Stage 1 compressor

relay

Stage 1 compressor

relay

Stage 1 compressor

relay

Stage 2 compressor

relay, 2nd-speed fan

relay

Stage 2 compressor

relay

Stage 2 compressor

relay

Fan relay

Not used

Fan relay

Changeover valve

relay

O/B

Changeover valve relay

24VAC power from

cooling transformer*

24VAC power from

cooling transformer

24VAC power from

cooling transformer

Stage 1 heat relay

Stage 2 heat relay

Not used

Stage 1 heat relay

W2/AUX

W2/AUX Auxiliary heat relay

W2/AUX Stage 2 heat relay

24VAC Common wire

Stage 3 heat (W3),

humidiﬁcation (HUM),

dehumidiﬁcation

(DEHUM), 3rd speed fan

relay

Emergency heat (E),

humidiﬁcation (HUM),

dehumidiﬁcation

(DEHUM)

Emergency heat (E),

humidiﬁcation (HUM),

dehumidiﬁcation

(DEHUM)

Star*

24VAC power from

heating transformer

24VAC power from

heating transformer

24VAC power from

heating transformer

Humidiﬁcation (HUM),

dehumidiﬁcation

(DEHUM), or

Humidiﬁcation (HUM),

dehumidiﬁcation

Humidiﬁcation (HUM),

dehumidiﬁcation

(DEHUM), or ventilation

AQ+

(DEHUM), or ventilation

* No jumper wires required. You don’t need to hang on to any old jumper wires going from Rh (sometimes just

ventilation

called R) to Rc. Nest will automatically jump these two connectors.

Second wire from

equipment in AQ+ (if

applicable)

Second wire from

equipment in AQ+ (if

applicable)

Second wire from

equipment in AQ+ (if

applicable)

AQ-

VIEW FULL SCREEN PDF MANUAL

General	Details
Name	Google Nest Learning Thermostat (4th gen) Installation Guide
Make	Nest
Language	English
Filetype	PDF (Download)
File size	17.85 MB

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