Single And Dual Transformer Systems (Split Systems); Single Transformer System; Dual Transformer Systems - Ecolink Z-Wave TBZ500 Installation & Operation Manual

SINGLE AND DUAL TRANSFORMER SYSTEMS (SPLIT SYSTEMS)

HVAC systems may have one or two transformers. The "R" wire connects differently
depending on the system.
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,
batteries MUST be installed.
W Connect to the W1 terminal
NOTES: Ensure that the appropriate wires are screwed into the terminal blocks firmly. Gently pull on the wires to confirm
the connection. Push all excess wiring back into the wall opening.
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 connecting the wires.
Wire Terminal
Y2 Connect to the Y2 terminal (2-stage systems only)
Y or Y1 Connect to the Y1 terminal
G Connect to the G terminal
COOL Rc Connect to RC terminal
C Connect to C terminal (Cooling System C Wire, NOT Heating System C Wire)
HEAT Rh Connect to RH terminal
W or W1 Connect to W1 terminal
W2 Connect to W2 terminal (2-stage system only)
IMPORTANT!: for separate rc/rh systems, the internal rc=rh jumper must be cut on the back of the thermostat's printed circuit board.
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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 connecting the wires.

Dual Transformer Systems

For HVAC systems that have separate
heating and cooling systems, each with
their own 24VAC transformers, there will
be an "R" wire from the heating system
and an "R" wire from the cooling system.
For dual transformer systems, connect
the "C" wire from the cooling system to
the thermostat's "C" terminal. DO NOT
CONNECT THE "C" WIRE FROM THE
HEATING SYSTEM.
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