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CONVECTION ELEMENT AND THERMOCOUPLES
The convection element is located in the rear back
on the left side of the oven. It is controlled by one
of the two solid state relays (K5), located in the top,
center of the control compartment of the oven. The
K5 relay coil operates on 24VDC which is supplied
from the I/O control circuit assembly. The tempera-
ture is referenced by two "K" type thermocouples.
The HX thermocouple is in the rear of the oven
D
by the catalytic converter.
The CC thermocouple is located on the top left
D
side of the oven near the front by the door.
To test the operation of the convection circuit, run
the oven in the test mode. See page 3---2 for Self
Test information. The element will not energize if
the convection motor is not running. You will have
to troubleshoot the convection motor and its con-
troller before continuing.
The resistance of the hot air element for 240VAC
units is 12 ohms, it draws approximately 20 amps.
The resistance of the hot air element for 208VAC
units is 9 ohms, it draws approximately 23 amps.
One of the wires to the hot air element is looped
through an inductance coil transformer on the I/O
Air Duct Panel
(with element)
Remove and reinstall insulation carefully to eliminate mi-
crowave emmissions
CC
Thermocouple
FIGURE 2
5---2
CONVECTION CIRCUIT
control circuit assembly. It must draw a minimum
current of 7.5 amps to satisfy the circuit. If it does not,
the display reads HTR CURR LOW. If a thermocouple
is open the display reads 999. The thermocouples
are held in place with a compression fitting.
Before replacing a thermocouple, inspect the 40
pin connector where the thermocouples plug into
the I/O control circuit assembly. It is possible you
just have a loose connection. Try unplugging and
reconnecting the 40 pin connector. When replac-
ing a defective thermocouple, it is important to rein-
stall the new thermocouple so it protrudes a specif-
ic distance inside the oven cavity. See FIGURE 2.
Replace the thermocouple as follows:
1. Make a note where the old thermocouple ex-
ited the compression fitting.
2. Measure the distance from the exit point to the
end of the thermocouple.
3. Mark this distance on your new thermocouple
with a marker or a piece of tape.
4. Install the new thermocouple.
Thermocouple
High Limit
HX
Thermostat
Rear View
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