RCS Technology TZ45A User Manual

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.

RCS Technology TZ45A Specifications

General

Power Source	Battery
Accuracy	+/- 1°F
Display	LCD
Power Supply	2 x AA batteries
Temperature Range	5°C to 35°C
Mounting	Wall