Pub. No. 18HD50D1-1A-EN 12/2018
Part No. 37-7768003
11
Trane XR203 Programmable Thermostat
NOTES:
1) Wire third party condensate overflow
switches between Y of the thermostat
and Y1 of the airflow control board
2) X2 is required to energize aux heat
during defrost
2 Stage Heat Pump with GAM5B
Indoor Unit
Outdoor Unit
Thermostat
Rc
Rh
O/B
Y
G
W/E
C
L
Y2
W2
R
O
G
W1
B
W3
W2
W2
B
X2
Y/Y1
R
Y2
NOTES:
1) Wire third party condensate overflow
switches between Y of the thermostat
and Y1 of the airflow control board
2) X2 is required to energize aux heat
during defrost
Heat Pump with GAF2-S
Indoor Unit
Outdoor Unit
Thermostat
Rc
Rh
O/B
Y
G
W/E
C
L
Y2
W2
R
O
G
W
B
B
X2
Y/Y1
R
