NuTone NTBZ48 User Manual

Copyright © 2016 Broan-NuTone LLC 9
Heat Pump HVAC System Connections
NOTE: For typical connecons to a Heat Pump HVAC system, refer to the diagram on Page 3.
The terminals on the back panel have two sets of labels. The lower label shows HEAT PUMP HVAC
terminal connecons. The upper label shows the STANDARD HVAC terminal connecons.
Figure 9. Heat Pump HVAC System Terminal Block Labeling
Figure 10. Heat Pump HVAC System Thermostat Terminal Block Connections
Connect the wires from the HVAC system to the corresponding terminals on the thermostat back
terminal block. Use the table below as a guideline for connecng the wires.
Wire Terminal
Y Connect to the Y1 terminal
G Connect to the G terminal
R Connect to either R terminal
C Connect to the C terminal. The C wire (24VAC common) Heat Pump systems typically
have the C wire connected to the thermostat. If there is no C wire, baeries MUST be
installed
W Connect to the W1 terminal
O or B Connect to the O terminal. Heat Pump setup must set changeover valve to correct O
or B seng (See page 13).
NOTES: Ensure that the appropriate wires are screwed into the terminal blocks rmly.
Gently pull on the wires to conrm the connecon.
Push all excess wiring back into the wall opening.
Y2
Y1
GRC
CRH W1W2 Standard
Y2
Y1
G
R
C
R
W1
O
Heat Pump
HEAT PUMP SYSTEM
TERMINAL WIRING
Y2
Y1
G
RC
C
RH
W1
W2
O or B
W
C
G
Y
STANDARD
Y2
Y1
G
R
C
R
W1 O
HEAT PUMP
(STICKER LABELED WIRES)
REFERENCE
HEAT PUMP
TERMINALS
R

NuTone NTBZ48 Specifications

General

Brand	NuTone
Model	NTBZ48
Category	Thermostat
Language	English