Quick Installation Guide
RCT8100
Programmable Thermostat
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Call 1-800-468-1502.
RCT8100 Programmable Thermostat
Installation is Easy
Your new thermostat has been designed for fast and easy installation. Just follow the simple step-by-step instructions in the following pages.
n Identify your system type. o Remove your old thermostat. p Identify the wires.
q Mount the new wallplate. r Connect the wires.
s If the wire labels don’t match. t Specify the furnace type.
u Install the batteries. v Install the thermostat. w Set the system.
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Quick Installation Guide
n Identify System Type
This thermostat is compatible with the following systems:
•Gas, oil or electric furnace
•Central air conditioner
•a hot water system with or without pump
•a millivolt system
•a central heating and cooling system
If you are not sure of your system type or if you have any other questions, call us toll-free at 1-800-468-1502.
This thermostat is not compatible with heat pumps or multi-stage systems.
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RCT8100 Programmable Thermostat
o Remove Old Thermostat
1)Turn power off at the heating/cooling system.
2)Remove old thermostat, but leave wallplate with wires attached.
Do not remove wallplate yet.
MERCURY NOTICE: Do not put your old thermostat in the trash if it contains mercury in a sealed tube. Contact your local waste management authority for instructions regarding recycling and proper disposal.
3
Quick Installation Guide
p Identify Wires
If any wires are not attached to your old thermostat or are attached to a terminal marked C or C1, they will not be connected to your new thermostat. Wrap the bare metal end of each of these wires with electrical tape, so it cannot touch and short other wires.
Do not use non-connected wires.
Do not use C or C1 wires 
Identify and label each wire.
IGNORE WIRE COLORS: Use terminal screw designations to identify wires.
Disconnect wires and remove the old wallplate only after all wires are labeled. Wrap the wires around a pencil to prevent them from falling though the wall opening.
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RCT8100 Programmable Thermostat
q Mount New Wallplate
1)Remove coverplate.
2)Loosen screw (the
screw remains captive on wallplate).
3) Remove thermostat.
4)Mark and drill appropriate mounting
holes (or use existing holes). Insert plastic anchors. Pass wires
through opening of wallplate and secure
Labelswallplatedon’tomatch?the wall
If a usingwire doesprovidednot match any terminal on the thermostat, seescrewsnext page. .
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Quick Installation Guide
r Connect Wires (typical wiring)
Remove jumper if you have both R and Rc wires.
1)Match each labeled wire with the terminal having the same letter.
2)Loosen the terminal screws using a screwdriver, insert the wires, then tighten the screws.
3)Push any excess wire back into the wall opening.
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RCT8100 Programmable Thermostat
s Connect Wires (less common wiring)
If a labeled wire does not match any terminal designation, see diagram below.
Do not use C, X or B. Wrap bare end of wire with electrical tape.
If wires are connected to both Rh and Rc terminals, remove jumper (see previous page).
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