AprilAire 3-Wire to 4-Wire Adaptor

The AprilAire 3 to 4 Wire Adapter can be used in applications where additional wiring cannot be run, the 3 to 4 wire or where you may need to add a wire to the thermostat. The adapter can also be used to fix a broken wire, or add a common wire to a 4-wire system (the green and yellow wires of the Diode 'Y' may not be connected to the R or C terminal of the thermostat).

The 3 to 4 Wire Adapter can be mounted inside the HVAC unit or inside the control box. The 3 to 4 Wire Adapter should not be installed in a location where the adapter or wiring may be exposed to the elements. Wires running from the adapter are 9" long. 3 to 4 wire adapter should be within 9" of thermostat connections to the HVAC terminal block.

In The Box:

• Circuit Board
• Diode "Y"
• 2 x Wire Nuts

Notes:

• The adapter should not be installed in a location where it or its connected wiring may be exposed to the elements.
• All wiring must be in compliance with all applicable local and national codes.
• All wiring should be color coded in conformance with standard recommendations.
• All wiring should be 18- 22-gauge, unshielded wire. The maximum installation distance between the adapter and the thermostat for 18-gauge wire is 100 feet. The maximum installation distance between the adapter and the thermostat for 22-gauge wire is 36 feet.