2.2.3After labeling all the wires, use a screwdriver to disconnect each wire from its terminal. Remove the old thermostat.
Make sure that the wires don’t fall into the wall after you detach them from
the old thermostat. You may choose to
tape them to the wall or tightly wind them 
around a pencil or screwdriver.
2.4Match and connect wires
2.4.1Match each wire coming from the wall to its corresponding terminal, as shown in the illustration below. Insert each wire into the hole on the side of its matching terminal. Using a screwdriver, tighten the screw securely. DO NOT REMOVE THE WIRE LABELS.
No thermostat installation uses all of the wires shown below. In most cases, between 4 and 5 terminals are wired. The remaining terminals will not be used.
2.3Install new thermostat’s wallplate
2.3.1Detach the new thermostat’s wallplate from the rest of the thermostat and position the wallplate on the wall according to the illustration below, passing the labeled wires through the wire hole in the center of the wallplate.
2.3.2With the wallplate flush against the wall, mark mounting holes with a pencil.
L
O 
B 
Y 
Y2 
L
O
B
Y
Y2
W | W |
|
W2 | W2 | |
G | ||
G | ||
RH | ||
RH | ||
RC | ||
RC | ||
C | ||
C | ||
|
L | W | Mounting hole |
W2 |
| |
O | G |
|
B | RH |
|
Y | RC |
|
Y2 | C | Wallplate |
|
|
Do not allow wires to touch each other or parts on the thermostat. Doing so could result in damage to your heating and cooling unit.
2.3.3Move the wallplate aside. Drill the mounting holes using a 3/16" drill bit. With a hammer, tap the wall anchors, provided in the package, into the drilled holes.
2.3.4Position the wallplate on the wall again and screw the mounting screws into the wall anchors. Do not use a power screwdriver, you may damage your thermostat.
A maximum of one wire from the wall can be wired into each terminal.
2.4.2 In the new thermostat, a jumper wire connects the RC and RH terminals.
If, in your OLD thermostat… | Then… |
Terminals RC and RH (or 5, or R5) | …leave the jumper wire in place |
were connected by a jumper wire, | in the new thermostat. |
There was a terminal R, which you then | …leave the jumper wire in place |
labeled RC according to 2.2.2, | in the new thermostat. |
Terminals RC and RH (or 5 or R5) | …remove the jumper wire from the |
were NOT connected by a jumper wire, | new thermostat. |
|
|
If you’re not sure whether terminals RC and RH were connected in your old thermostat, refer to your notes made in section 2.2.2.
10 | 11 |
