Despatch LCC/LCD2-14-3 Non Pass Through Series - Manual (Page 34)

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6. The first segment of the program is
the PURGE MODE. Set the nitrogen
flow meter to 300 - 350 SCFH. This
program energizes the purge solenoid
valve.
7.
The second segment is the
MAINTAIN MODE, the purge solenoid
valve is de-energized and the
maintain solenoid is energized to
maintain the nitrogen level to less
than the purge level. Adjustment is
made with a needle valve located in
the front bottom of the oven. The maintain valve is left energized for as long as
the nitrogen level is desired to be maintained.
8.
The last segment of the program is the cooldown, where the water valves are
energized to bring the chamber temperature down to a safe unloading
temperature. Set the water cooling flow meter to 3 GPM (11 LPM), and adjust, if
necessary. The water cooling flow meter is located on the lower left side of the
oven.
High Limit Alarm with Alarm Silence
This option provides an audible and visual alarm when the temperature exceeds the
high limit setpoint on the control. The alarm horn is located on the right side of the
control panel door. On the front of the control panel door, there is an illuminated (red)
momentary push button switch to silence the alarm horn.
When the chamber temperature exceeds the high limit setting on the control, the heater
will shut down the Alarm Horn will sound and the red push button will illuminate. To
silence the alarm:
1.
Depress the Alarm Silence push button.
The Alarm Horn will be silenced, but the red pilot light on the push
button will remain illuminated.
(optional beacon light-equipped units) The red (top) beacon light will
illuminate, indicating a fault has occurred.
2.
When the high limit condition clears, press reset on the control. See the section
on the Protocol Plus controller for detailed operation.
3.
The heater should be back on and the control should be functioning correctly.
The red pilot light will be off.
WARNINGS:
Suffocation can occur in a nitrogen-
atmosphere oven chamber if it is not
thoroughly purged with room air
before a person goes inside it. Before
entering an oven chamber, run the
oven for at least five minutes with the
nitrogen (or any other inert) gas
turned off, doors open and
recirculation fan running. Only then
should a person work inside the oven
chamber with the doors closed.