RCS Technology TZ45A Installation Manual

This thermostat is compatible with most HVAC systems, including the following:

24VAC systems Note: requires both the 24R and 24C (common) wires

Standard gas/oil/electric heating systems
o
o

Heat Pump systems:
o
o
o

Do NOT use for line voltage controls (120/240VAC)
Stop!
Before removing your existing thermostat, be sure to label the
wires with the terminal markings on the old thermostat and record them
below
.
Standard HVAC System Wiring
Terminal Meaning
Marking
C 24VAC Common
R 24VAC Return
G Fan
W or W1 Heat stage 1
Y or Y1 Cool stage 1
W2 Heat stage 2
Y2 Cool stage 2
Heat Pump HVAC System Wiring
Terminal Meaning
Marking
C 24VAC Common
R 24VAC Return
G Fan
W or W1 Aux Heat
Y or Y1 Compressor stage 1
O (or B*) Change Over Valve
Y2 Compressor stage 2
* if you have a terminal marked "B" with a brown wire attached to it, that means you have a
changeover (C/O) with heating type heat pump system. Be sure to set the change over
type in the Installer Settings menu to C/O Type: w/Heat. Otherwise leave it set to
w/Cool.
DCN: 140-02034-03

Installation Guide

Model TZ45A
Z-Wave Thermostat
1 stage heating and cooling
2 stage heating and cooling
1 stage heating and cooling
2 stage heating and cooling
nd rd
2 or 3 stage Auxiliary heating (heat strips)
Typical Wire Color
Blue
Red
Green
White
Yellow
Orange
Black
Typical Wire Color
Blue
Red
Green
White
Yellow
Orange (brown*)
Black
Record the old thermostat wire
connections and terminal
marking here
Record the old thermostat wire
connections and terminal
marking here
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