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5.
Hints
5.1.
Repairs & Replacements
A)
Change of Tube
Always make sure that the reason for malfunctioning is due to element failure before
disassembling the furnace
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Ceramic tube can be freely changed for tube furnaces over 1400 C where
SiC and MoSi2 heating elements are used.
Please use following procedure when changing tubes for furnaces with Silicon
Carbide heating elements:
1.
Always disengage power before starting the replacement.
2.
Remove the thermocouple
3.
Remove the tube when cold (Temp. <45°C), slowly without any contact with
the SiC heating elements.
4.
Replace the new tube.
5.
Reconnect the thermocouple.
6.
Heat the furnace till 900°C.
Always use the installment diagram supplied to change the SiC and
MoSi2 heating elements
During reassembly process one must be careful to use the correct terminals.
Reheat the Furnace to 900°C.
Do not use insulation that appears loose .Most of the time the very same insulation
can be obtained from local market. We can of course deliver the concerned
insulation whenever requested.
B)
Replacement of Solid State Relay
Always disengage power before opening the back panel. Use proper screw driver
and remove the back panel or control box. Disconnect the relays, taking note of
connection diagram and coloring of wires. Remove the dis-functioning relay using a
screw driver and place the new one to the related rail. Close the back panel and heat
up the furnace till 900°C.
C)
Replacement of Thermocouple
Always disengage power before opening the back panel. Use proper screw driver.
When there is thermocouple break down, the controller always gives a related
warning at display. When there is a problem with it remove the metal support of
thermocouple and remove the cables noting the coloring of connecting cable.
Remove the thermocouple slowly taking note not to break the ceramic sheath if
there is any. Reverse the process and heat up the furnace.
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