Add-A-Wire Manual

54
Making 5 Wires Work When 6 Wires Are Required
If you have System C or E from pages 48-49 or any system that requires 6
wires, and you would like to install the First Alert model THERM-500 using
only 5 wires, follow the directions below. You will need a screwdriver
along with a 3" long piece of thermostat wire to use as a jumper:
1. Make sure the power is off.
2. Label and disconnect wires at the thermostat. Please note the color
and corresponding wire designator with each color. For example:
The R wire is red and the W wire is white and so on. You will need
this information handy for the next step at the HVAC equipment.
3. At the HVAC equipment end of the thermostat wires (usually at the
furnace), locate the terminals that the wires are attached to.
4. Remove the “G wire” from the terminal marked G.
5. Place the “G wire” on terminal C.
6. Place one end of the 3" long jumper on terminal G.
7. Place the other end of the 3" long jumper on terminal Y. Please note
that there will be more than 1 wire on terminal Y.
8. When connecting the wires to the First Alert thermostat, note that
the wire that was previously connected to the G terminal of the old
thermostat will now be required to be connected to the C terminal
on the First Alert thermostat. All other wires will be connected such
that the connections on each end of the individual wires match
terminal designations. For example: Connect the yellow wire on the
thermostat end to the Y terminal on the thermostat. The yellow wire
will be connected to the Y terminal on the HVAC equipment end also.
Installation Instructions