Ametek TM2000 Pro, User Manual

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Service and Parts | 7-3
thermocouple Replacement
Disconnect power from the sensor and control unit and allow the
sensor to cool before replacing parts inside the sensor.
To remove the thermocouple, do the following:
1. Locate the thermocouple wires (red and yellow). Loosen the cable clamp
nut on the sensor board that holds these wires in place. Disconnect the wires
from terminals C and D on the sensor board and pull them through the con -
duit hole connecting the sensor board to the sensor.
2. On the furnace assembly, remove the screw and lock washer from the ther-
mocouple mounting tab. Save the screw and lock washer for when you insert
the new thermocouple.
3. Pull the thermocouple straight up and remove it from the furnace.
4. Insert the new thermocouple into the slot in the top of the furnace (the
thermocouple should orient to the right as you face the front of the unit). It
should go in freely; if necessary, wiggle a little to position without forcing it
in.
5. Place the lock washer and screw on the thermocouple mounting tab and
tighten.
6. Feed the thermocouple wire through the conduit hole, and reconnect ther -
mocouple wires to the terminal board (red wire to D, yellow wire to C), and
tighten the cable clamp nut.