Here is the manual for the GR9S96 model furnace.

This article is for the following models:

GR9S960403AN

GR9S960603BN

GR9S960803BN

GR9S960804CN

GR9S960805CN

GR9S961005CN

GR9S961205DN

GD9S960403BN

GD9S960603BNA

GD9S960804CN

GD9S961005CN

GD9S961205DN

Here is the video if you are going to use a non-A2L refrigerant system. This shuts off the sensor.