3-2
Start Cycle Switch
Pushing this button initiates a programmed cycle. The valve state indicator
lamps described in 3.1.1 will illuminate as the program is executed.
Stop Cycle / Alarm Silence Switch
Pushing this button when the furnace is in-cycle aborts the program; when not
in-cycle pressing this button silences the audible alarm system.
Lid Cycle Switch
Note: The lid cycle switch initiates a canned routine that uses vacuum, exhaust,
and backfill functions together with a mechanical latching mechanism to lock the
lid.
• Closing the Lid: Pressing the Lid Cycle Switch when the lid is closed and
the handle has been pushed into the DOWN position initiates the lid locking
sequence. A timed Exhaust Cycle will be followed with a timed Vacuum
Cycle; when the chamber is sufficiently evacuated the latching mechanism
will automatically engage.
• Opening the Lid: Pressing the Lid Cycle Switch when the lid is locked
initiates a timed Exhaust Cycle followed by a timed Vacuum Cycle; when the
chamber is sufficiently evacuated pulling back on the handle and returning it
to the up position disengages the latch. Pressing the Lid Cycle Switch a
second time initiates a timed Backfill Cycle returning the chamber to
atmospheric pressure and allowing the lid to be opened.
3.1.3 Audible Alarms
The control system generates audible alarms based on errors or failures that are
detected while the furnace is in-process.
Water Flow Alarm
The control system will generate an audible alarm if coolant flow is insufficient
or interrupted for longer than five seconds when the furnace is in-process. Note:
In some applications the alarm may be disconnected, please refer to 2.2.3.
Lid Open Alarm
The control system will generate an audible alarm if the Start Cycle Switch is
pressed while the lid is still open or if the lid handle is pulled back while the
furnace is in-process.
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