3
INSTALLATION GUIDE
524 Control Installation and User Guide
5. Find a wire from the thermostat bundle that is unused at the thermostat and at the furnace.
It is possible that one of the unused wires at the thermostat will already be connected to the 24 VAC common terminal at the
furnace. If so, go to “6 Label and remove old thermostat wires” on page 3.
6. Connect the unused wire to the 24 VAC terminal, then replace the furnace cover.
The 24 VAC common wire is typically (but not always) blue in color. If the blue
wire has been unused, it is recommended that you use the blue wire.
If you are unsure about connecting this wire or you do not have any
unused wires at the thermostat, contact Customer Service at 877-288-7707.
6
Label and remove old thermostat wires
1. Label the wires on your existing thermostat to match terminal names.
DO NOT USE WIRE COLORS TO CHOSE LABELS. THE TERMINAL NAME IS
WHAT IS IMPORTANT.
2. Locate the wiring labels included with the new thermostat.
3. Observe where each wire is connected to the existing thermostat and find the
letter shown next to that wire terminal.
4. Attach the corresponding label the wire.
IMPORTANT NOTES:
If you have a short jumper wire between two terminals, remove the jumper and
do not label it. This jumper wire is not required on the new thermostat.
If you had to connect a new 24 VAC common wire, you will use the “C” label on
that wire.
If you have a W terminal, use the W1 label on that wire.
If your thermostat has any terminals with names that do not match any on the label, write down the terminal names and wire
colors for later reference.
TAKE A PICTURE
It is recommended that you take a picture that clearly shows the wires attached to your existing thermostat terminals. This could be
needed later if you have troubles with your installation.
7
Remove existing wall plate.
The 524 Control is designed for installation in climate controlled living spaces. It is recommended to place the unit in a central
location with good circulation. Avoid exterior walls and areas near windows, doors, vents or concealed pipes or chimneys.
NOTE: DURING THIS PROCESS, MAKE SURE THAT THE WIRES DO NOT PULL BACK INTO WALL OPENING.
5. Detach all wires from wall plate.
6. Remove all screws attaching the wall plate to the wall and remove wall plate.
7. See “MERCURY NOTICE”.
MERCURY NOTICE
When this control is replacing a control that contains mercury in a sealed tube, dispose of the old control properly. Contact
your local waste management authority for instructions regarding recycling and proper disposal. A listing of heating, ventilating
and air conditioning wholesalers that participate in the Thermostat Recycling Corporation’s recycling program are available at
www.thermostat-recyle.org .
G
W
R
C
Connect
wire
Y
Y
G
W1
C
R
G
Rc R
C
Wire colors and
letters may vary
!
W1
