Johnson Controls GLAS Technical Bulletin page 19

Figure 20: Heat Pump with Dual-Stage Auxiliary Heat
Heat Pump
RC
W1
Figure 21: Heat Pump with Auxiliary Heat
Furnace
re d
w e
P o ic e
c e e v n
rn a X D R u
F u
A U
R
C
Heat Pump
Figure 22: Traditional Heat with Dual Transformers
Boiler/Heat Control Board
C R W1
Boiler
GLAS Smart Thermostat Technical Bulletin
C AUX
G
Y1
W2 Y2
RH O
C
C
C AUX
RC G
W1 Y1
W2 Y2
RH O
Air Handler/Cooling
Control Board
C R
C AUX
RC G
W1 Y1
W2 Y2
RH O
19
HVAC System Control Board
Heat Heat Cool Reversing
C RC Stage 1 Stage 2 Fan Stage 1 Valve
C RC W1 W2 G Y1 O
HVAC System Control Board
Compressor
Aux Heat
Command Reversing
RC Stage 1 Fan
Stage 1 Valve
RC W1 G Y1 O
Y1 G
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
Outdoor AC Unit
Air Handler