• Allows 5-wire thermostats to use only 4 wires
• Also allows 5 wires to work like 6 wires
• Easy to install
• Easier than running new wire

In applications where additional wiring cannot be run to your programmable digital thermostat, the Add-A-Wire accessory can be used to add a wire to the thermostat. The accessory can also be used to fix a broken wire, to make one thermostat work like two, to add cooling to a heat-only system, or to add a common wire to a 4-wire system.

Please Note: the green and yellow wires of the Diode "Y" may not be connected to the R or C terminal of the thermostat. (The function of a diode is to allow current in one direction and to block current in the opposite direction.)

This accessory works with the 1-Day Programmable Digital Thermostat, the 7-Day Programmable Digital Thermostat, and the 7-Day Programmable Thermostat, Dual Fuel (each sold separately).

• Owner's Manual

Add-A-Wire Accessory

Y Diode

4 Wire Nuts

Thermostats