RTC 2115150301, Owner'S Manual

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Figure 4.4.1.1 Lamp Schematic showing Kaowool Packing
4.4.1.1.Make sure all power is totally removed from the system, and all
indicator lamps are OFF.
Remove all side covers, chamber doors and element end covers to
completely expose all heating element terminations.
To prevent discharge shock, carefully short a lamp terminal in each zone
to the frame to eliminate any capacitor charge.
4.4.1.2.Using two 3/8 inch wrenches, hold the nut below the element lead
wire with one wrench while removing the top nut with the other
wrench.
Do this at one end of the element only.
4.4.1.3.Use an ohmmeter and verify that the lamp filament is open.
If the element is bad, remove the nut and washers. Note that one cannot
determine, in general, if an element is bad by visually inspecting the
element with power applied or by an ohmmeter in-circuit check.
4.4.1.4.Remove the element and old packing material in both ceramic ends.
4.4.1.5.Before attempting to install a new element, it is absolutely
imperative that two new pieces of insulating material (RTC P/N
P/N 73327
Kaowool
2.3”
Chamber
Ceramic Lamp
Seal
Heating
0.6”