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What
are the fuel, water, and electrical requirements for the
furnace? |
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Burn-off furnaces operate on a
"low pressure" gas supply. The required gas pressure for
most models is 25mbar water column maximum, 18mbar water
column minimum. Water pressure must be 0.7bar minimum, 10bar
maximum at an available flow rate of 7.0 gpm. Electrical
requirements are 220/230VAC, 1 phase, 50/60Hz, (10 to 20
amps depending on furnace size). Other voltage models are
available.
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What
type of maintenance is typically required? |
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The water spray nozzles must
be checked before each cleaning cycle. All furnaces are
equipped with manual valves for checking the spray nozzles.
Dust and dirt must be blown out of the burner blower fans
periodically in order to help keep the burners operating
trouble free. Once every several months, the door gasket
should be examined to make sure it is not missing or torn,
and the wall insulation should be inspected for any
mechanical damage.
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My
furnace will not reach operating temperature.
Is there a problem with the furnace? |
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In most cases, failure of the
furnace to reach operating temperature can be attributed
either to a high negative air pressure in the building where
the furnace is installed, or to an exhaust stack which is
too tall. Controlled Pyrolysis Cleaning Furnaces operate on
natural draft. If the building where the furnace is
installed has a high negative pressure, then the burner
blower fans must be ducted outside in order to prevent
starving the burners for air. If the exhaust stack height
exceeds certain limits, then a draft damper must be
installed in the stack in order to limit the draft inside
the furnace to an acceptable level. Torn or missing door
gasket can also present the furnace from heating up by
allowing cool air to leak in around the furnace front doors.
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My
parts do not come out clean. What is wrong with the furnace? |
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There are several things that
can cause this to occur. First, the furnace may not be
getting up to set point due to air leaks into the furnace,
low gas pressure to the burners, or excessive water spray.
Second, the parts may simply not be loaded into the furnace
correctly. If parts are so densely packed that the furnace
heating gases can not circulate around the parts, the
cleaning rate is retarded and cycle times are increased.
Third, the furnace temperature may simply be set too low to
remove the material from the parts. Most paints require a
cleaning temperature of at least 430-480°C. Most plastics
require 480-530ºC.
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How
often will the explosion relief door(s) on my furnace open? |
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Never in most instances,
however, should an ignition or fire occur, the door(s) will
swing open momentarily to relieve any excess pressure and
then immediately close back to oxygen starve any fire. All
furnaces are required to have explosion relief vents.
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