Copyright
©
2020 Nortek Security & Control
5
4
Copyright
©
2020 Nortek Security & Control
Thermostat Power
The thermostat can be powered by either 24VAC from the HVAC system or from four (4) type AA
internal batteries.
DO NOT
use this thermostat for line voltage controls (120/240VAC).
The C Wire
If the 24VAC common wire (usually blue) is present and is connected to 24VAC common at the HVAC
system end, the thermostat can be powered from the HVAC system. If there is no common wire,
batteries are required.
24VAC Power
Powering the thermostat with 24VAC power
requires
both the 24VAC “C” common wire (typically a
blue wire) and the 24VAC ”R” return wire (typically a red wire).
Battery Power
Powering the thermostat from batteries
does not
require a “C” wire connection.
DO NOT
install batteries if the thermostat is powered by 24VAC. They are NOT required for backup.
If the thermostat is powered by batteries, the thermostat will operate for approximately (2) two
years on four (4) AA Alkaline batteries depending on the frequency of user operations and backlight
operation. Always use Alkaline batteries and replace them in complete sets of four (4).
Z-Wave Operation when Battery-Powered
IMPORTANT: When the thermostat is installed on a Z-Wave network, while it is battery
powered, it will NOT work as a Z-Wave repeater .
Remove Existing Thermostat
•
Turn the thermostat power off. This is usually done at the heating/cooling system or circuit
breaker panel.
•
Remove the cover of old thermostat to expose the wiring terminals.
•
Take a picture of the wiring terminals and wires before disconnecting them!
•
Mark the existing thermostat wires with the labels (not included) according to the terminal
markings. Some installations may have additional wires not shown in the example illustration
below (Y1, Y2, W1, W2, O,B).
•
Use the thermostat terminal “names/marking” (not the wiring color) to mark the wires.
•
Remove the old thermostat base.
CAUTION: When removing thermostat, don’t let the wires slip into the wall and
don’t let the wires touch each other.
•
If the old thermostat was a mercury style thermostat, dispose of it properly as described below.
Figure 2.
Label Wire Terminals
Note:
Taking a picture is critical if problems are encountered. This will allow reinstallation of the old
thermostat and help with troubleshooting later if needed.
Terminal
Typical Wire Color
Function
Y
YELLOW
Cool
W
WHITE
Heat
G
GREEN
Fan
R
RED
24VAC Return
C
BLUE
24V Common (typically BLUE). When the wire is present,
the thermostat can be powered without batteries. When
the wire is absent, the thermostat must be powered by
batteries if 24VAC is present across the R&C wires
Wiring Colors
While the thermostat terminal markings are intended to match the wire color (R=RED, G=GREEN,
W=WHITE, Y=YELLOW), be sure to follow the terminal marking when marking the wires, even if the
wire color doesn’t match.
WARNING: If the existing thermostat is a mercury-containing device, it must be
disposed of in compliance with federal, state and local regulations. Many states and/
or local agencies have collection/exchange programs or hazardous waste collection
programs for mercury-containing-devices. For more information, see the U.S.
Environmental Protection Agency website at:
https://www.epa.gov/large-scale-residential-demolition/mercury-containing-devices-and-
C
R
G
W
Y
C
R
G
W
Y
LABEL THE WIRES TO MATCH
THE OLD THERMOSTAT TERMINAL
MARKINGS. LABELS NOT INCLUDED.
Existing Thermostat Terminals
TAKE A PICTURE!
