35
To avoid premature burnout of a replacement heating
element, be sure that the insulation tail supplied with the
replacement element is inserted between the two legs of
the element as shown in the drawing. Also be sure that
the heating element projects sufficiently into the cham-
ber. Insert element until welded portion (where large
diameter meets small diameter) projects approximately
1/4" into inside of furnace chamber.
To replace a heating element: (refer to Fig. 1A).
a. Remove top cover from heating chamber side of
furnace.
b. Remove the clips holding the connector cable (4) to
the defective heating element. Unwrap the connector
cable from the element.
c. Slide the heating element with element ceramic holder
attached upward, out of the slot in the insulation.
Save the blanket insulation for reuse.
d. Remove the element ceramic holder, noting its exact
position on the heating element.
e. Fasten the element ceramic holder on the new ele-
ment in exactly the same position it was on the old
element.
f. Begin inserting the new element with element ceramic
holder attached into the slot in the insulation; stop
when there is just enough room left to insert the new
element insulation.
g. Continue sliding the element with the element insula-
tion tail into the slot. DO NOT FORCE - even slight
pressure can fracture the heating element.
h. When the element ceramic holder is nearly seated
against the main insulation, check the top of the
element insulation tail. In its final position, the top
should be about 1/8 inch below the surface of the
main insulation.
i. Position the blanket insulation piece from step c in the
cavity over the insulation tail. Complete insertion of
M
AINTENANCE
AND
S
ERVICING
