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Thermocouple
junction
To run this inspection, instrument must be turned OFF, unplugged and furnace at
room temperature.
Thermocouple used in instrument is made of platinum-platinum/rhodium (type R)
and is normally very durable. In particular, it is impervious to oxidation or damage
by heat; only a mechanical incident could damage the junction (i.e. the tip) of the
thermocouple.
1. This inspection consists in verifying the junction of thermocouple for visible
Door Safety
switch
To run this inspection, instrument must be turned OFF, unplugged and furnace at
room temperature.
The door safety switch removes the power to the elements inside the furnace
whenever the door opens. This switch is located in the back compartment of the
furnace.
1. This inspection consists in verifying the switch actuation lever and electrical
58
1.8
Re-install safety shield.
IMPORTANT: Always disconnect the instrument from the power outlet when
working with panels removed. 240 Volts inside! Risk of electrocution!
damage.
1.1
Unplug K2 (240 volts – risk of death by electrocution).
1.2
If deemed necessary, you can remove the furnace door (see page 81,
Furnace door removal for details).
1.3
Visually inspect the thermocouple junction. Verify that no mechanical
shock has occurred, which could havecrushed or otherwise damaged the
thermocouple junction.If junction is damaged, a new thermocouple
should be ordered and installed.
1.4
Also make sure that the ceramic rod of the thermocouple protrudes by
about 10 mm from the furnace insulation. If that is not the case, gently
push the furnace insulation back against the rear wall of the furnace.
(Note that a thermocouple tip standing too close to the insulation will
read inaccurately low temperatures, causing furnace overheating.)
IMPORTANT: Always disconnect the instrument from the power outlet when
working with panels removed. 240 Volts inside! Risk of electrocution!
contacts for signs of corrosion or possible overheating. Indeed, when the
switch is toggled, small electrical arcs can be produced inside the casing,
which can lead to a failure of the switch due to over-oxidation of the contact
surfaces.
1.1
Unplug K2 (240 volts – risk of death by electrocution).
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