User Guide

Copyright © 2015 Nortek Security & Control LLC 7
Standard HVAC System Connections
NOTE: For typical connec ons to a Standard HVAC system, refer to the diagram on Page 2.
The terminals on the back panel have two sets of labels. The upper label shows the STANDARD HVAC
terminal connec ons. The lower label shows HEAT PUMP HVAC terminal connec ons.
Figure 5. Standard HVAC System Terminal Block Labeling
Figure 6. Standard HVAC Systems Terminal Block Connections
Single and Dual Transformer Systems (Split Systems)
HVAC systems may have one or two transformers. The “R” wire connects diff erently depending on
the system.
Single Transformer System
Most HVAC systems have a single 24VAC transformer. For these systems, there is only one “R”
wire and it can be connected to either the thermostat’s RC or RH terminal as these are internally
jumpered together.
If installing a Standard HVAC system, 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 RC or RH terminals (Except for Dual Transformer Systems, See Next
Page)
C Connect to the C terminal. C wire (24VAC common) may not be present. If not present,
ba eries MUST be installed.
W Connect to the W1 terminal
NOTES: Ensure that the appropriate wires are screwed into the terminal blocks fi rmly.
Gently pull on the wires to confi rm the connec on.
Push all excess wiring back into the wall opening.
Y2
Y1
G
RC
C
RH
W1
W2
W
C
R
G
Y
STANDARD
Y2
Y1
G
R
C
R
W1
O
HEAT PUMP
(STICKER LABELED WIRES)
REFERENCE
STANDARD
TERMINALS
CONNECT IF 2 STAGE SYSTEM
CONNECT IF 2 STAGE SYSTEM
Y2
Y1
GRC
C RH W1W2 Standard
Y2
Y1
G
R
C
R
W1
O
Heat Pump
STANDARD HVAC
SYSTEM TERMINAL
WIRING