RCS Technology TZ45A, Installation Manual, Page: 1 / 16

DCN: 140-02034-03 Page 1
Installation Guide
Model TZ45A
Z-Wave Thermostat
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
1 stage heating and cooling
o
2 stage heating and cooling

Heat Pump systems:
o
1 stage heating and cooling
o
2 stage heating and cooling
o
2
nd
or 3
rd
stage Auxiliary heating (heat strips)

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
Marking
Meaning Typical Wire Color Record the old thermostat wire
connections and terminal
marking here
C 24VAC Common Blue
R 24VAC Return Red
G Fan Green
W or W1 Heat stage 1 White
Y or Y1 Cool stage 1 Yellow
W2 Heat stage 2 Orange
Y2 Cool stage 2 Black
Heat Pump HVAC System Wiring
Terminal
Marking
Meaning Typical Wire Color Record the old thermostat wire
connections and terminal
marking here
C 24VAC Common Blue
R 24VAC Return Red
G Fan Green
W or W1 Aux Heat White
Y or Y1 Compressor stage 1 Yellow
O (or B*) Change Over Valve Orange (brown*)
Y2 Compressor stage 2 Black
* 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 .