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R
G
W
R
Y
G
Heating
Thermostat
W
R
C
G
Furnace
W
Y
Cooling
Thermostat
Figure 18: Separate Thermostats; Same Furnace and
Cooling Unit
RC
RH
R
G
G
W/E
W
C
C
W2
W2
Y
Furnace
O
Thermostat
Add Jumper if O.D T-Stat is not used
Figure 19: Same Thermostat; Separate Furnace and
Heat Pump Units with separate transformers
Wire Color
RED
WHITE
GREEN
YELLOW
BROWN
Table 10: Recommended Heating/Cooling Thermostat Wire Color Codes and Connections.
Wire Color
RED
WHITE
GREEN
YELLOW
BROWN
BLACK
Heat (Optional 2nd Stage Heat)
ORANGE
Heat Pump Reversing Valve Solenoid
BLUE
Cooling ‐ (Optional 2nd Stage Cooling)
Table 11: Recommended Heating/Cooling/Heat Pump Thermostat Wire Color Codes and Connections.
Typical Heating/Cooling Thermostat Wiring Connections
WINCHESTER BY MORTEX PRODUCTS INC
24 VAC
to Furnace Trans
C
Y
24 VAC Common
to Furnace Trans
Condenser
Outdoor Section
24 VAC
to Heat pump Trans
RC
24 VAC
to Furnace Trans
24 VAC
Opt.
O.D.
T-Stat
W/E
24 VAC Common
to Furnace Trans
C
24 VAC Common
to Heat pump Trans
W2
Y
NOTE: Trans = Transformer
O
Heat Pump
Outdoor Section
Description
24 VAC
Heat (1st Stage Heat)
Indoor Fan
Cooling ‐ Stage 1
24 VAC Common
Description
24 VAC
Heat (1st Stage Heat)
Indoor Fan
Cooling ‐ Stage 1
24 VAC Common
FORT WORTH, TX 76106
RC
RH
G
W
C
Y
Thermostat
Figure 20: Same Thermostat; Separate Furnace and
Cooling Units with separate transformers
24 VAC
When using separate thermostats a thermostat interlock
system must be provided to prevent simultaneous operation
of the furnace and air conditioner. Simultaneous operation
can result in equipment overheating, equipment damage,
and energy wastes.
Do Not connect the Yellow wire to the thermostat unless an
outdoor unit is installed.
Letter
Furnace Pig Tail
Code
Wire Connection
R
W
G
Y
BRN
Letter
Furnace Pig Tail
Code
Wire Connection
R
W
G
Y
BRN
BLK
O
BLU
Remove the control box cover.
1.
R
24 VAC
to Furnace Trans
24 VAC
R
G
W
24 VAC Common
to Furnace Trans
C
C
Furnace
Y
Cooling Unit
Outdoor Section
Thermostat
Connection
Red
R
White
W or W1
Green
G
Yellow
Y or Y1
Brown
C
Thermostat
Connection
Red
R
White
E
Green
G
Yellow
Y or Y1
Brown
C
White
W2
N/A
O
N/A
Y2
NOTE: Trans = Transformer
Condenser
Connections
N/A
N/A
N/A
Y or Y1
C
Condenser
Connections
N/A
N/A
N/A
Y or Y1
C
N/A
O
Y2
Page 12
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