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9.4.
HOT AIR PLENUM TEMPERATURE PROBE INSTALLATION AND CONNECTION (RTD)
On the Max Caddy, a RTD has to be installed on the side of the furnace using the support provided with the unit. The
RTD is a sensor that reads the temperature inside the hot air plenum. It is critical to the good operation of the furnace.
Refer to electric diagram for connection details. It is important that the RTD and the RTD support be properly fixed onto
the hot air plenum.
WARNING: USE WIRING SUITABLE FOR 75 °C (not included).
STEP 1: Remove the two screws already secured to the furnace (B) on the side where you have chosen to install the
link board. Then, secure the RTD support (A) using the two screws you previously removed.
STEP 2: Using a drill and a 9/32" bit, drill a hole in the hot air plenum so that the RTD rod can pass into it.
STEP 3 and 4: Secure the RTD in place on the hot air plenum using the two self-tapping screws provided with the
owner's manual.
Once the RTD is installed on the support, proceed to its
connection to the link board. Pass the RTD wires in the
grommet and exit them close to the link board. For board
connections, refer to the wiring diagram.
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