Questions of "What needs to be done" when installing a "New, A2L Compliant" Miller, Intertherm, Gibson, Maytag, Frigidaire, or other house trailer furnaces, and the existing air conditioner is R-22 or R410a.

When the existing air conditioner refrigerant is non-A2L, nothing else needs to be wired into the control system, no changes to settings are required on the furnace control board.

The product line will not change the furnace controls; however, they will utilize the A2L sensor with the indoor coil.

A2L Indoor Coil

     C85 Loose Coils

C85 Loose Coils have been evaluated for the safe use of A2L refrigerants, to meet requirements by Nortek and the standards in UL 60335-2-40. Due to the nature of the flammability of A2L refrigerants, modifications have been made to mitigate refrigerant leaks from a C85 coil in an E7 furnace.

Nortek has added an A2L sensor on all C85 coils located in the front plate.

See Figure 1. See the C85 wiring diagrams and installation instructions for the installation of an C85 coil in an E7 furnace.

Wiring diagrams using the Nordyne A2L sensor.