NuTone NTBZ48 User Manual

Copyright © 2016 Broan-NuTone LLC 5
Remove Existing Thermostat
• Turn o the power to the thermostat. This is usually done at the heang/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 the wires aached to them!
Figure 2. Label Wire Terminals
NOTE: Taking a picture is critical if problems are encountered. This will allow
reinstallation of the old thermostat and will 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
baeries. When the wire is absent, the thermostat
must be powered by baeries if 24VAC is present
across the R&C wires
CAUTION: When removing thermostat, don’t let the wires slip into the wall and don’t let the wires
touch each other.
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.
• Mark the exisng thermostat wires with the wiring labels included according to the terminal
markings. Some installaons may have addional wires not documented in this example
illustraon. 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.
• If the old thermostat was a mercury style thermostat, dispose of it properly as described below.
WARNING: If the exisng thermostat is a mercury-containing device, it must be disposed of in
compliance with federal, state, and local regulaons. Many states and /or local agencies have
collecon/exchange programs or hazardous waste collecon programs for mercury containing
devices. For more informaon, see the U.S. Environmental Protecon Agency website at:
hp://www.epa.gov/osw/hazard/wastetypes/universal/mce.htm For Canada: Environment
Canada and Disposing of Mercury Products at: hps://www.ec.gc.ca/mercure-mercury/default.
asp?lang=En&n=F111AAC6-1.
C
R
G
W
Y
C
RG
W
Y
LABEL THE WIRES TO MATCH
THE OLD THERMOSTAT TERMINAL
MARKINGS
EXISTING THERMOSTAT TERMINALS
TAKE A PICTURE!

NuTone NTBZ48 Specifications

General

Brand	NuTone
Model	NTBZ48
Category	Thermostat
Language	English