Barnstead 30400 Operation Manual page 42

P S
ROBLEM OLVING
Problem
Slow heatup.
Door switch does not cut
power to the furnace chamber.
Repeated element burnout.
42
Probable Causes
Low line voltage.
Heavy load in chamber.
Wrong heating element
One or more heating
elements are burned out.
Wired improperly.
Door switch is not functioning.
Safety relay malfunction.
Overheating furnace.
Heating harmful materials.
Corrective Action
Install line of sufficient size
and proper voltage (Isolate
furnace from other electrical loads).
Lighten load in chamber
to allow heat to circulate.
Install proper element.
Replace burned out elements.
Check wiring diagram for
correct wiring of your furnace.
Realign door strike or
replace door safety switch.
Replace safety relay.
Do not exceed the maximum
operating temperature of
furnace or recommended
continuous intermittent use
values.
Enclose material in container.
Clean up spills on chamber.
Ventilate chamber by leaving door
cracked slightly open when heating
known harmful reagents.