Johnson Controls GLAS Technical Bulletin page 15

Figure 8:
re d
w e
P o ic e
c e e v
rn a n
X D R u
F u
A U
R
C
Furnace
Figure 9:
Air Handler
re d
w e
P o
ic e
c e e v
rn a X D R u n
F u A U
R
C
Outdoor AC Unit
Figure 10: Self-Powered Auxiliary Device
AUX Device
GLAS Smart Thermostat Technical Bulletin
Traditional Heat
C AUX
RC G
W1 Y1
W2 Y2
RH O
Traditional AC
C AUX
RC G
W1 Y1
W2 Y2
RH O
HVAC System
Control Board
C RC
24 VAC
C RC
C AUX
RC G
W1 Y1
W2 Y2
RH O
15
HVAC System
Control Board
Heat
C RC Stage 1
C RC W1
NOTE: When there is only
one transformer, the RC terminal
is used.
NOTE: Forced air heating systems
often have a G wire to run the fan
independently, but not all systems
use a G wire.
HVAC System Control Board
Cool
C RC
Fan Stage 1
C RC
G Y1
C
AUX Device
R
AUX
Switch
Relay
Coil
AUX