Ecobee SMART THERMOSTAT, Installation Manual, Page: 8 / 18

Y
W O/B
G
W2 AUX
R/H
R/C
ACC1
ACC1r
ACC2
ACC2r
ACC3
ACC3r
Equipment Interface
Y1
G
W2
R
W1
Y2
Furnace
Humidifier
C
24V
Air Conditioner
NOTE Indicates jumper. Non Powered Accessories will require a jumper from RH | RC to ACC1, ACC2, ACC3 for a 24V feed.
factory installed jumper.
Diagram indicates 24V humidifier terminal. If your furnace control board does not have this, you must use a 110V/24V step down transformer.
Three Stage Heat 2 Stage Cool With 1 Accessories
Y1
Hum
C
3rd Stage
Heat
Humidifier
2nd Stage
Cool
R
C
Y2
W3
Three Stage Heat, Two Stage Cool with One Accessory
Single Stage Heat/Cool , Dual Stage Auxiliary Heat with Humidifer
Y
W O/B
G
W2 AUX
R/H
R/C
ACC1
ACC1r
ACC2
ACC2r
ACC3
ACC3r
Equipment Interface
O
W1
Y/Y2
G
R
W2
C
Fan Coil
Humidifier
Y
O
R
W2
C
C
24V
1-Speed Heat Pump
CONFIGURE ACC2 - Emerg Heat 2 | ACC3 - Humidifier
NOTE Indicates jumper. Non Powered Accessories will require a jumper from RH | RC to ACC1, ACC2, ACC3 for a 24V feed.
factory installed jumper.
1 Stage Heat/Cool With 2 Stage Auxiliary Heat (Duel Fuel) With Humidifier Accessory
C 110V
Humidifier
Aux Heat
Stage 2
24V C
Y
W O/B
G
W2 AUX
R/H
R/C
ACC1
ACC1r
ACC2
ACC2r
ACC3
ACC3r
Equipment Interface
Y1
G
W2
R
W1
Y2
Furnace
NOTE Indicates jumper. Non Powered Accessories will require a jumper from RH | RC to ACC1, ACC2, ACC3 for a 24V feed.
factory installed jumper.
Diagram indicates 24V humidifier terminal. If your furnace control board does not have this, you must use a 110V/24V step down transformer.
Two Stage Heat/Cool Two Stage Auxiliary Heat (Duel Fuel) With One Accessory
Hum
C
Aux Heat
Stage 2
Humidifier
Comp2
Humidifier
C
24V
Heat Pump
Y2
O
R
W2
C
Y1
Dual Stage Heat/Cool, Single Stage Auxiliary Heat with Two Accessories
Dual Stage Heat/Cool, Dual Stage Auxiliary Heat with One Accessory
Y
W O/B
G
W2 AUX
R/H
R/C
ACC1
ACC1r
ACC2
ACC2r
ACC3
ACC3r
Equipment Interface
Y
G
R
Hum
W
C
Furnace
NOTE Indicates jumper. Non Powered Accessories will require a jumper from RH | RC to ACC1, ACC2, ACC3 for a 24V feed.
factory installed jumper.
Diagram indicates 24V humidifier terminal. If your furnace control board does not have this, you must use a 110V/24V step down transformer.
Two Stage Heat/Cool With 1 Stage Auxiliary Heat (Duel Fuel) with 2 Accessories
HRV
Humidifier
Comp2
Humidifier
C
24V
HRV
C
24V
Y2
O
R
W2
C
Heat Pump
Y1
indicates a jumper. Non-powered accessories require a jumper
from RH / RC to ACC1, ACC2, ACC3 for a 24V feed.
11 Installing The Smart Thermostat Installing The Smart Thermostat 12