What Wires Do You Have; Prepare Wires; Connect Your Wires - Radio Thermostat CT80 Install Manual

4

What wires do you have?

Make sure your wires are labeled. This may require you to fi nd the 'other end' connection for each
wire on your heating or air conditioning equipment and read the label there. Refer to the Wire
Reference page 13 for better understanding of wire labels from different HVAC system makers.
IMPORTANT: C wire or 24VAC power is required for the CT80 to operate. If you do not have a C
wire you can run a new wire from the HVAC to the CT80 or provide 24VAC power to operate the
CT80 using a standard 24VAC wall transformer.
IMPORTANT: If you have both RH and RC you need to
remove the metal jumper-clip between these 2 terminals.
IMPORTANT: If you have both O and B you must check

Prepare wires

Please follow these guidelines for safe and
secure wire connections:
• You will need at least 2.6" of wire for each of your connections to the CT80.
• If you do not have enough wire, splice additional wire to allow enough slack.
• Fan out wires below the hole as shown.
• Remove insulation 1/8" from the tip of each wire.
• Take care not to damage the labels for each wire in handling.
Screw terminal
5
Caution
Do not allow wires to touch each other or parts on
thermostat.
• Fan wires out as illustrated with CT80 below the
wall opening. As in the example: fan out the wires so
that the C wire is above the C terminal the W above
the W. This allows the CT80 to fi t snug to the wall.
• Wires will position behind the CT80 and up over the
terminal area.
• Do not bunch wires behind CT80. Feed any slack
back into the wall opening.

Connect your wires

• Connect labeled wires only to a terminal with the
same letter label.
• Insert the wire in the terminal well and tighten the screw securely.
• Do not over-tighten, this will cut the wire.
• If a 24VAC transformer [Radio Shack PN273-1690] is used, connect to the C and RH terminals (no
polarity).
Jumper
Clip
page 13 for wiring info.
from furnace
W
F ro m
F u rn a c e
W
4
PG
2.6"
5
PG