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3
Installing the
Thermostat
3.1. Quick Guide
1. Removing the old thermostat.
• Turn OFF power at the breaker.
CAUTION! To prevent electrical shock and/or
equipment damage, disconnect electric power
to the system at the main fuse or circuit breaker
box until installation is complete.
• Remove the cover from the old thermostat to expose
the wires.
• Identify each wire to corresponding terminal and
disconnect.
• Remove the old thermostat from the wall, making
sure that the thermostat wires do not fall back into
wall opening.
2. Mount the new thermostat.
• Feed the thermostat wires through the thermostat
hole.
• Wire the new thermostat.
• Turn ON the power at the breaker.
3. Configure the thermostat.
4. Check thermostat operation.
5. Getting to Know the Commercial Communicat-
ing Programmable Thermostat
The sections that follow provide detailed instruc-
tions for completing these steps.
Quick Guide
3.2. STEP 1: Remove the Old
Thermostat
WARNING! To prevent electrical shock and/or
equipment damage, disconnect electric power
to the system at the main fuse or circuit breaker
box until installation is complete.
3.2.1. Thermostat Components
The standard heat/cool thermostat normally con-
sists of three basic parts:
1. Cover
2. Base, which you can remove by loosening all
screws
3. Switching sub-base, which you can remove by un-
screwing the mounting screws that hold it on the
wall or adaptor plate
3.2.2. Removing the Old Thermostat
1. Remove the front cover of the old thermostat.
2. With wires still attached, remove the wall plate
from the wall by unscrewing it. If the old thermostat
has a wall mounting plate, remove the thermostat
and the wall mounting plate as an assembly.
3. Identify each wire attached to the old thermostat as
shown in Figure 3-1. Before removing wires from
the old thermostat's switching sub-base, label each
wire with the letter on the old thermostat. Ignore
wire colors and use the letter designation only.
4. Disconnect the wires from the old thermostat one at
a time.
WARNING! Do not let wires fall back into the
wall.
TIP: You may want to wrap the wires around
a pencil to keep them from falling back into
the wall.
Installing the Thermostat • 3
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