Despatch LCC/LCD2-14-3 Non Pass Through Series - Manual (Page 35)

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4.
If the high limit trips repeatedly, identify the cause and correct the problem.
Class A Configuration
The “Class A” configuration is used for
handling flammable solvents. NOTE: With
this option the exhaust fan is wired to be
ON at all times.
The “Class A” option has
an explosion relief panel and purge interlock
devices:
In case the LEL (lower explosive
limit) is exceeded, and an
explosive mixture is ignited in the
oven, the explosion relief will
rupture, preventing any more
physical damage to the oven.
An airflow switch on the exhaust, to verify exhaust fan is operating.
A purge timer, which is preset to keep heater off until the purge period is
complete. The preset purge period guarantees a complete four (4) air
exchanges of to remove volatiles in the chamber before the heater can be
turned on.
Any failure of these devices will shut down the heater, preventing any further
processing until the condition is remedied.
Set Up
The rear of the oven must have a minimum of six (6) inches of clearance between the
oven and any wall for explosion relief.
When this option is installed, the LCC/D2-14A*-3 is designed for SPECIFIC amount of
solvent. Exceeding this amount could result in an explosion. Refer to the nameplate
decal for the exact amount of solvent, exhaust, and fresh air required.
CLASS A OVENS ONLY!
WARNING: “Class A” ovens are
designed for a specific amount of
solvent. Exceeding this amount could
result in an explosion. Do not process
closed containers of any substance or
liquid in this oven because they may
explode under heat. In case of fire,
leave door(s) as they are. Shut off
electricity. Shut off fuel. Call the
fire department. Stay away.