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AW000873-G 39
8.2 Dual Transformer Equipment
The following procedures describe how to install an AS20 Auxiliary Switch for HVAC equipment that has two
transformers, with or without a common wire.
The Auxiliary Switch facilitates the installation of a thermostat in a Dual-transformer HVAC system, regardless of
whether a common wire connection from the equipment to the thermostat is available.
These dual-transformer instructions should be used with installations incorporating separate Heat and Cool equipment,
each with its own transformer. For a Heat-only HVAC installation or an integrated Heat/Cool installation using a single
transformer servicing both Heat and Cool parts of the equipment, please refer to 8.1.1 Installing the Auxiliary Switch
(AS20).
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, and G). Now
disconnect the wires and remove the existing backplate.
Step 2 – Mount the new backplate and connect the wire labelled RC to the R terminal block.
Step 3 – Install the signal coupler provided with the Auxiliary Switch between W and C terminal blocks on the backplate.
Twist the signal coupler wire with the wire labelled W to ensure that it is held securely.
Connect the wire labelled W 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. With separate equipment, it is
generally advantageous to mount the Auxiliary Switch at the Cooling equipment. 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.
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