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h.
Remove control unit.
i.
Set new control unit on heating chamber and secure to heating chamber with four screws.
j.
Reconnect red and yellow wires to thermocouple. The yellow wire fastens to the positive terminal
and the red wire to the negative terminal. (SEE Figure 2 for wiring.)
k.
Reconnect the short white insulated wire to terminal one (T1) and the longer one to terminal two
(T2).
l.
Replace bottom plate and secure with four screws.
m.
Replace back terminal cover and its four screws.
n.
Reconnect furnace to power supply.
o.
Test operation of furnace.
6-8.
To Replace Insulation:
a.
Disconnect furnace from power supply.
b.
Remove the back terminal cover with its four screws. (Note placement and connection of wires.)
c.
Disconnect terminal one (T1) and terminal two (T2) wires.
d.
Disconnect thermocouple and the yellow and red wires connected to the terminals.
e.
Disconnect all element lead wires from terminals and straighten the lead wires to allow them to
pass through the back-cover of the heating chamber.
f.
Remove the four elements by pulling each element through the front of the furnace. (The top
element is usually the easiest to remove first.)
g.
Remove back cover with its six screws to expose insulation.
h.
From the inside of the furnace, push out the middle insulating piece.
i.
Remove the two side insulating pieces through the back of the furnace.
j.
To remove the top and bottom pieces of insulation (these are the larger pieces), remove the
bottom plate with its four screws.
k.
Remove the four screws that hold the control section to the heating chamber and remove the
control section.
l.
Remove the five screws of the bottom plate of the heating chamber to expose the bottom piece
of insulation.
m.
Push the sides of the heating chamber out to remove the large bottom and top insulating pieces.
n.
Insert the new insulation piece in the top first, then the side pieces, and the bottom insulating
piece is last. (For best results, push sides of heating chamber out for the bottom piece of
insulation.)
o.
Replace the bottom heating chamber plate and the five screws.
p.
Re-fasten control section onto heating chamber using four screws and replace bottom plate onto
control section with four screws. Turn furnace upright.
