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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 di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 rmly.

Gently pull on the wires to conrm the connecon.

Push all excess wiring back into the wall opening.

STANDARD

W1 O

HEAT PUMP

(STICKER LABELED WIRES)

REFERENCE

STANDARD

TERMINALS

GRC

CRH W1W2 Standard

Heat Pump

STANDARD HVAC

SYSTEM TERMINAL

WIRING

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