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Prepare and install a new element
Fit the insulation block on to the element.
Slide the element up through the brass assembly. Important note: If the element legs will
not line up with both brass assemblies, do not force it. Slacken off the brass locknuts to
allow the brass assemblies to move, these will be retightened later.
Replace the split tube sleeves onto the element tails, adjust the length of element tail to the
dimension measured previously. Replace the tube nuts hand tight only. Retighten the brass
locknuts using 2 spanners. Retighten each tube
nuts using 2 spanners.
Gently replace the whole assembly into the
furnace, noting the numbering and orientation
marks made previously. Be sure that it has
seated down flat, If this can not be achieved,
lift out the whole assembly, slacken off the large
nuts, reposition the brass assemblies, retighten
and try again.
Ensure
that
the
positioned: the thin part of the element, and the
tapered section, should ideally be entirely within
the heating chamber; the element should not
touch the bottom of the chamber.
Important: When fitted there should be a
minimum clearance of 10mm below the bottom
of the element, and a minimum clearance of
15mm from the sides of the chamber. The
elements should ideally be parallel with the
sidewalls, but some bending is allowed provided
the minimum wall clearance is maintained.
Replace and tighten all 12 bolts. If more than
one element assembly has been removed,
reposition them all before tightening any of the
bolts.
The
correct
microwave shield plate is crucial to microwave
containment. If fitted incorrectly, or if not all 12
bolts are replaced then microwave leakage may
occur. Contact Carbolite if in doubt.
Replace the ferrite cores. Connect the braids according to your notes (and photographs)
taken earlier, using the clip tool provided. It helps to pinch the braid on with a pair of long
nosed pliers. The braids must be held tightly to the element as the clips are fitted: good
contact is essential; poor contact can lead to sparking and destruction of the top of the
element.
Replace the element tails MW shield lid and the external cover. When the element
replacement is complete and all external covers are refitted a microwave leakage test must
be carried at 100% microwave power.
If the previous element failure resulted from a fault in the control system, heat up the
furnace to a moderate temperature and ensure that the furnace is controlling properly.
MF 55-GB 1.21
elements
are
correctly
fitting
of
the
element
Element clip
Ferrite core
Brass tube nut
Brass split tube sleeve
Brass locknut
Brass washer
Mica washer
Ceramic spacer
Brass bolts
Element MW shield plate
Mica washer
Brass washer
Brass bulkhead
Element
Insulation block
Element assembly parts
MRF 16/22
Fig 14.6
47
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