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AW000873-G 36
8.1.1 Installing the Auxiliary Switch (AS20)
The Auxiliary Switch facilitates the installation of a thermostat where a common wire connection from the heating
and/or cooling equipment to the thermostat does not exist.
These single transformer instructions should be used with a Heat-only HVAC installation, or with an integrated
Heat/Cool installation that uses a single transformer to service both Heat and Cool parts of the equipment. For
installations with separate Heating and Cooling equipment, each with its own transformer, see 8.2 Dual Transformer .
The Auxiliary Switch is installed on or close to the equipment so that the five wire cable reaches the control terminals
inside. The Auxiliary Switch should not be installed inside the HVAC equipment enclosure (doing so may void the HVAC
UL certification).
Before Starting the Installation:
Check that the package includes 1 Auxiliary Switch Unit, 1 signal coupler and 5 Splice Wire Caps.
Turn off the power to the furnace, air conditioning and/or heat pump, either at the shut-off switch, or at the
electrical panel.
Thermostat site:
Step 1 - Remove the old thermostat from the backplate. If there is no backplate then remove the thermostat from the
wall to access the wiring. Next, label the wires according to which terminal block they connect to (R,Y,W,G). Then
disconnect the wires and remove the existing backplate.
Step 2 – Mount the new backplate and connect the wire marked R to the R terminal block. Also connect the wires
labelled W and Y to the corresponding terminal blocks.
Step 3 – Install the signal coupler provided with the Auxiliary Switch between G and C terminal blocks on the backplate.
Twist the signal coupler wire with the wire labelled G to ensure that it is held securely.
Connect the wire labelled G to the C terminal block. Any remaining wires should be connected as per their installation
instructions.
Step 4 – Make note of the color and/or labels on the wires attached to each of the terminal blocks. Attach the
thermostat to the backplate.
Equipment site:
Step 5 – In the equipment area, find a convenient location to mount the Auxiliary Switch. The location should be
outside the equipment but close enough so that the five wire cable reaches the thermostat connections inside. Mount
the Auxiliary Switch using 2 screws or adhesive pad provided.
Step 6 – Before disconnecting wires at the equipment, label them according to which equipment terminal block they
are connected, verifying that these labels match the labels you attached in step 1.
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