Radio Thermostat CT102 User Manual page 9

Connecting Your Wires
Reference the Wire Diagram on
diagram and set-up information. If necessary, contact customer
support for help.
1. Connect a labeled wire only to a matching lettered terminal.
2. Insert the wire in the terminal well and tighten the screw securely.
The CT102 can be externally powered with a power source
rated from 12V to 24V, AC or DC, at 300ma or greater. If
used, connect to the C and RH terminals (no polarity).
The 24VAC "C" wire is the other side of the 24VAC heating
transformer and can be found where the other thermostat
wires connect at the wall or at the furnace. Do not use the
common or ground side of the line voltage.
The CT102 runs on 4 AA alkaline batteries, the C wire (if
available), or both batteries and the C-wire. If you do not
have a C wire, you can run a new wire from the HVAC or
use a standard 12-24V [AC or DC] wall transformer.
The C-wire is optional but preferred for all installations.
Installation Guide CT102
page # to identify your wiring
From HVAC System
Wiring
9