Table of Contents
Advertisement
24
SmartCommand Thermostat
Installation Manual
HVAC system wiring
Wiring will differ depending on if your system is a standard gas or electric system or if your system is a heat
pump system.
Standard HVAC system wiring
Figure 18 shows the wiring diagram for a standard gas or electric HVAC system. Wiring colors are typical
thermostat wiring color codes.
Note:
For typical central heating/cooling systems, leave jumper JP1 installed. If you have separate heating and cooling
system transformers, cut jumper JP1. Wire RC to the cooling system transformer and RH to the heating system
transformer.
Figure 18. Standard HVAC system wiring
SW1
STD
1
S2
2
OFF
Note:
Wire R to either RH or RC for common transformer HVAC systems.
Thermostat control unit
HP
ON
FUSE
JP1
24V COM
Red (RH)
24V RH
Red (RC)
24V RC
W1 Heat 1
Orange
W2 Heat 2
G Fan
Y1 Comp 1
Yellow
Y2 Camp 2
J4
HVAC system
Standard HVAC system
Thermostat
connections
C 24 VAC common
R 24 VAC return
White
W1 Heat stage 1
W2 Heat stage 2
Green
G
Y1 Comp stage 1
Black
Y2 Comp stage 2
Fan
Advertisement
Table of Contents
