5-2
• Before processing parts the graphite tool should be out-gassed under
vacuum at a temperature at least 50 °C higher than the process
temperature. For processes that would exceed 425 °C the same
temperature can be used.
Caution! The Model 1200 must never be operated without a graphite tool or
target plate installed in the chamber. The vacuum seals and coolant seals on
the view port window and housing will be quickly destroyed from excessive
heating.
Monthly:
In general, monthly maintenance means four weeks of operation for one eight-
hour shift per day. This period of operation is not an absolute number and it is
possible that some of the tasks will be needed less often.
• Grasp the lid enclosure firmly on both sides and pull it straight up and
away from the lid. Referring to the lid assembly drawing in the
Illustrated Parts Manual, Section 5.4, wipe the old lubricant from the lock
lever, latch, and lock pins; items 14, 15, and 16. Apply fresh grease,
(white lithium recommended), wiping away any excess from the
mechanism. Install the cover and push firmly to reattach the hook and
loop fasteners.
• Test the system for leaks by pressurizing the system to 25 psig for three
minutes. The chamber pressure should not leak down in this period of
time. If the chamber will not hold pressure the leak will have to be
located and repaired. Please refer to Section 5.2.2 of the Trouble
Shooting Guide, and to Section 5.3.5 of Repairs and Adjustments.
• Load and run a typical processing profile. Shutoff the cooling water
supply, the furnace control system should generate an audible alarm and
the alarm lamp on the control panel should illuminate. If the water
cooling function is not used the flow switch will be disabled and this test
can be ignored.
• If the VP-5 Option was purchased with the furnace, check the oil level in
the vacuum pump and top off. Use only SST #32505 Vacuum Pump Oil
for this purpose.
• Look underneath the furnace for any signs of water leakage. If the
system is leaking, refer to Section 5.2.3 for troubleshooting information.
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