Ametek ASR900, Installation And Maintenance Manual

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Maintenance | 4-25
iii. Pull the wire from the Heater Cartridge into the Junction Box,
along with the other wires and RTD cable.
iv. Replace the plug that was removed from the Junction Box.
AMETEK recommends applying a small amount of high-tem-
perature thread lubricant to the threads.
The thread lubricant must not contain copper.
f. Replace the Heater Plug in the Heater Block.
g. Replace other parts or continue with Junction Box reassembly.
10. Replace the RTD:
a. Disconnect the RTD wiring and remove the RTD from the Heater
Block.
b. Remove the Heater Plug.
c. Install the new RTD (P/N 300-4924) in the Heater Block.
Connect the new RTD wires to the old RED wires and pull the
wires through the Thermal Insulation Tube from the Junction Box
side.
Carefully pull the RTD cable back from the Junction Box end until
there is no excess cable remaining inside the Heater Block.
d. Replace the Heater Plug.
e. Continue with Step 11 for final Junction Box assembly.
11. To allow for easier wiring inside the Junction Box, cut any excess wire
leads to approximately 4” (10 cm).
Wire the terminal strip as per your notes (or Figure 4-5).
12. Using a soft, non-abrasive cloth, clean the o-ring groove and the join-
ing surfaces (flamepath) on the Heater Block and its cover. Take care to
avoid dropping any contaminants into the Heater Block.
13. Insert the new Heater Assembly o-ring (P/N 300-8721) by using your
thumbs to push it into the o-ring groove in the Heater Block. Ensure it
is properly seated in the groove.
!
CAUTION