Trane A4AC3018A1000A Installer's Manual page 15

11.2 Low Voltage Hook-up Diagrams
HEAT PUMP SYSTEMS
Thermostat
24 VAC HOT
FAN
24 VAC
B/C
Common
SOV
COOL/HEAT
1st STAGE
HEATING
2nd STAGE
EMERGENCY
HEAT
With Furnace
Thermostat
R
24 VAC HOT
G
FAN
24 VAC B/C
Common
Y1
COOL
HEATING
W1
W2
*
• Units with pigtails require wirenuts for connections. Cap all unused wires.
• In AC systems for multiple stages of heat, jumper W1 and W2 together if comfort control has only one stage of heat.
* If equipped with second stage heat
** When using a BK enabled comfort control, cut BK jumper and bypass Y and YLo at the furnace. Connect BK from comfort control to
BK of the furnace
88-A4AC3001-1C-EN
Outdoor
Air Handler
R R
G G
B
Blue
O
Y
W1
W
White
W2
X2
Pink
In AC systems for multiple stages of electric heat, jumper W1
and W2 together if comfort control has only one stage of heat.
Outdoor
Furnace
Unit
R
G
B B
Y Y
W1
W2
AC SYSTEMS
Thermostat
Unit
R R
24 VAC HOT
G
FAN
24 VAC
B B/C
Common
O
COOLING
Y Y
HEAT
W
X2
Black
With Variable Speed Furnace
Thermostat
R
24 VAC HOT
G
FAN
24 VAC B/C
Common
Y1
COOL
W1
HEATING
W2
*
BK
Outdoor
Air Handler
Unit
R
G
B
B
Blue
Y
W1
White
W2
Pink
Outdoor
Furnace
Unit
R
G
B B
O
Y Y
**
Y
LO
W1
W2
BK
**
15