7.2 Furnace terminals identification The furnace is equipped with three terminal blocks located on the left rear of the furnace. They are identified by the following three letters: T, R and I. T : Thermostat
R : RTD (plenum thermal probe) I : Relais Interlock (parallel add-on)
7.3 Installation and connection of the “RTD” thermal probe IMPORTANT : The proper positioning of the “RTD” thermal probe is essential to the proper functioning of the furnace. Install it in the opening provided for this purpose on the start-off plenum. Install the RTD probe in the plenum extension . Secure the RTD probe with the two screws provided (C) . Connect the RTD probe to the furnace block terminal identified with a “R”.
Use the wire grommets (F) supplied with the manual to attach the wires from the RTD to the furnace. Depending on the height of your ceiling and the plenum adjustment, the clearance hole in the top of the plenum might create an air opening in the plenum. In this case, install the plate (A) provided with your plenum kit and secure it with 4 self-drilling screws (D) to seal the opening.
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