2017_E_TYPE-HL.doc Page 30 of 55 24-Oct-2017
4.4 Curing Procedure
After installation, the oven must be cured. The curing procedure is described below.
Note: Ovens with special requirements are tagged. Further, wood forms are left in the
oxidizer for all ovens. These forms burn out during curing and may emit some smoke
temporarily. However, this is not a cause for alarm.
1. Check all connections and passages.
2. Turn off OTS (Over Temperature Suppression) valve and turn on electrical power to unit.
3. Turn down the manually adjustable gas valve on the process burner to a very low setting
(no flame protrusion from ports).
Note: The oven has a yellow jumper wire installed to allow the oxidizer to be bypassed
during the cure cycle.
4. Turn off the oxidizer firing gas valve. The oven is cured with the process burner and the
oxidizer on pilot.
5. Tap the scroll key on the process controller to confirm pattern #0 and the curing
procedure. Press the RUN/REST button on the programmable process controller to start
the cure cycle.
6. Program #0 will raise the oven temperature from ambient to 250
o
F using a 3 hour ramp
and hold for 6 hours. This should be accomplished with only the process burner on.
7. Then it will raise the temperature to 600
o
F using a 7 hour ramp rate. The refractory
should be allowed to soak for 6 hours at this temperature.
8. Finally the temperature will be raised to 800
o
F using a 2 hour ramp rate. The refractory
should be allowed to soak for 6 hours at this temperature.
Note: During the cure, if you can see steam at any temp, do not ramp up until steam is
gone. If the process chamber temperature does not increase as required, increase
the gas flow slightly by adjusting the manual flow valve.
9. The cure cycle is now complete.
10. The oven is now ready for normal operation.
11. Turn on OTS (Over Temperature Suppression) valve.
12. Turn on the firing valve to the oxidizer.
13. Reset both the process and oxidizer controller set points to normal operating
temperatures.
14. Review the firing instructions (Sections 4.5, 4.6) carefully before processing a load.
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