
The thermostat allows for the furnace to cycle on and off during a defrost in order to temper the discharge air, and it protects the compressor from high refrigeration pressures during defrost. Installation installing the DT1 Discharge Thermostat Probe The DT 1 discharge thermostat probe must be installed between the indoor coil and the furnace, 1 - Find a location to install the probe that is on the the coil endplate. Ensure that the probe will clear all plumbing, 2 - Remove the endplate