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18
Installing the Auxiliary Switch (AS20)
AS20 Auxiliary Switch Installation Guide
Missing Common Wire on Single transformer HVAC System
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 on this page should be
used with a Heat only HVAC installation or an integrated
Heat/Cool installation using a single transformer servicing
both Heat and Cool parts of the equipment. For installations
with separate Heat and Cool equipment, each with its own
transformer, please refer to the instructions on Page 2.
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 are currently connected
(R,Y,W,G). Now 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.
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 these labels match the labels attached
in step 1.
Step 7 –
Pass the five wire cable through a convenient
access hole in the equipment.
Step 8 –
The wire labelled G must be spliced to the
Auxiliary Switch cable using a wire cap as follows:
•
Wire labelled G to the Auxiliary Switch
WHITE
wire.
Step 9 –
Connect the blue and green wires from the
Auxiliary Switch to the equipment as follows:
•
BLUE
wire to the equipment C terminal.
•
GREEN
wire to the equipment G terminal.
Step 10 –
Connect the remaining two wires from the
Auxiliary Switch and the wire labelled R from the thermostat
as follows:
•
Auxiliary Switch
YELLOW
and
RED
wires and the wire
labelled R to the equipment R terminal.
Step 11 –
Restore power to the equipment and follow the
equipment configuration instructions in the thermostat user
manual for testing.
Step 12 -
Record the serial number of the unit, name and
address of the owner, and make and model of the heating
and/or cooling equipment. Install the Connection Diagram
sticker (AW000785) on a visible place on the HVAC cabinet
or on the wall close to the AS20.
Note
: If the old thermostat has no connection to G, but
instead to W, then connect the W wire to C at the thermostat
and the signal coupler between W and C at the thermostat
location. At the equipment location, connect the AS20 green
wire to W instead of G at the equipment. Connect the AS20
White wire to the W wire with a wire cap at the equipment
location.