System information

DCN: 141-01070-03 TR40 Thermostat Manual 28
Control Unit Installation
HVAC Unit Connection:
Electrically, the Control Unit looks like a standard thermostat to your HVAC system. All connections to the
HVAC systems are made at the normal thermostat connection on the HVAC unit.
Refer to the following HVAC wiring information for the type of HVAC system, Standard or Heat Pump, that the
TR40 is being connected to. Refer to your HVAC system’s documentation for specific information on its
thermostat connections.
STANDARD GAS/ELECTRIC HVAC SYSTEM WIRING
HEAT PUMP HVAC SYSTEM WIRING
STANDARD HVAC SYSTEM
G FAN
W1 HEAT Stage 1
Y COMP Stage 1
R 24VAC RETURN
C 24VAC COMMON
RED
GREEN
WHITE
YELLOW
RC
24VAC
RH
G FAN
G FAN
W HEAT
W1/2 HEAT Stage 3
Y1 C1
Y1 COMP Stage 1
W2/O
R 24VAC RETURN
C 24VAC COMMON
HVAC
SYSTEM
HEAT PUMP HVAC SYSTEM
RED
GREEN
WHITE
YELLOW
RC
24VAC
RH
THERMOSTAT CONNECTION
G FAN
TR40 CONTROL UNIT
W1 H1
TYPICAL THERMOSTAT
WIRING COLOR CODES
Y1 C1
Optional Stage 2 Cool
W2/O
HVAC
SYSTEM THERMOSTAT CONNECTION
TR40 CONTROL UNIT
TYPICAL THERMOSTAT
WIRING COLOR CODES
ORANGE
O CHANGEOVER
NOTE: Jumper JP2 is factory installed for common
transformer heating/cooling systems. RC = RH.
For separate RC and RH transformer systems,
cut jumper JP2.
NOTE: For Heat Pump Systems do not
remove this jumper.
JP2
RC=RH
JP2
RC=RH
Y2 C2
Optional 2
nd
Stage
Y2 COMP Stage 2
Y2 C2
Optional Stage 2 Heat
Y2 COMP Stage 2
W2 HEAT Stage 2
Multi-Stage
Configurations
2 Stage Heat/1 Stage Cool
Heat 1 = Y1
Heat 2 = W2
Cool 1 = Y1 + CO
2 Stage Heat/2 Stage Cool
Heat 1 = Y1
Heat 2 = Y2
Cool 1 = Y1 + CO
Cool 2 = Y2 + CO
3 Stage Heat/2 Stage Cool
Heat 1 = Y1
Heat 2 = Y2
Heat 3 = W1
Cool 1 = Y1 + CO
Cool 2 = Y2 + CO
Multi-Stage
Configurations
1 Stage Heat/Cool
Heat = W1
Cool = Y1
2 Stage Heat/Cool
Heat 1 = W1
Heat 2 = W2
Cool 1 = Y1
Cool 2 = Y2