Barnstead International Thermolyne 859 Series, Service Manual

Page: 112 / 118

5. Reconnect power. Increase the chamber set
point temperature to 650°C using the chamber
set button. Increase the filter set point tempera-
ture to 900°C by performing a hidden key 5 to
change filter set point temperature as follows:
Turn the green power switch “off”. Press and
hold the #5 key in while pressing the green
power switch. Once the furnace “beeps”release
the #5 key.)
6. Allow the unit to reach and maintain the
650°C/900°C condition for at least 3 hours.
(The furnace has a course filter in the top
plenum that will burn itself clean.) Do not initi-
ate a cycle, let the unit in the idle mode for the
duration.
7. After this 3-hour period, reset the chamber tem-
perature to your desired burning level. Reset
the filter temperature to 750°C by performing the
hidden key #5 routine.
Routine cleaning of the NCAT is complete.
Chamber Temperature
Verification/Calibration
NCAT Specifications:
Chamber Size = 14” x 14” x 14”
Chamber max set point = 650°C
Filter max set point = 900°C
Factory default set point temperatures = 538°C
chamber; 750°C filter
NOTE: The 859 or 945 Series NCATS do not have a
predrilled calibration port. Customer may need to remove
back cover and drill their own 1/4” diameter port through
the back wall. View page 115 for a view of the back of
the unit and the location of the port.
NOTE: 1087 & 1275 series NCATS have a predrilled cali-
bration port-hole with an access cover on the back of the
furnace. You do not need to remove the back cover to
access the port-hole.
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M
AINTENANCE