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AprilAire 3-Wire to 4-Wire Adaptor

SKU: RP8022

Usually ships in 1-2 days.


WARNING: Cancer and Reproductive Harm –


Ensure Your Thermostat is Properly Wired

Ensure your thermostat or other HVAC applications are properly wired with the AprilAire 3-to-4 Wire Adapter. This adapter module mounts inside your HVAC unit or control box and provides space for additional wiring to be run between HVAC devices. The adapter can also be used in applications to add a common wire to a 4-wire system or to provide space to fix a broken wire. The adapter includes a Y diode that connects the two devices and relays their signals through one wire to the adaptor's circuit board. This eliminates the need for an extra wire.


  • Circuit Board
  • Diode "Y"
  • (2) Wire Nuts


  • 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.

AprilAire: Feel Good, Inside

It is the mission of AprilAire to provide superior Indoor Air Quality products for new and existing homes and businesses. AprilAire products are built to provide you and your family with the most comfortable home and the cleanest, healthiest air possible. Protect your home and your most valuable possession – your family.


  • Manufacturer Part #: 8022
  • UPC: 686720802201
  • Voltage: 24VAC Class 2
  • Warranty: 1-Year Limited