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© 2000 McDonald’s Corporation 819-5432 NOV 05
All Rights Reserved Card 15
Scratch Calibration Check
2. Remove gas valve vent tube. Clean and replace. See cleaning procedure in service
manual.
3. Clean combustion air blower. See the service manual for cleaning procedure.
4. Conduct recovery test as outlined on this card. The recovery test procedure varies
dependent upon the controller/computer model of your fryer.
5. If the vat does not meet the recovery specification, adjust the combustion air blower to
obtain the proper recovery time.
COMBUSTION AIR BLOWER ADJUSTMENT
Note: Use a multimeter that measures DC microamps when making burner air
adjustments.
Note: Ensure proper gas pressure is set out of the gas regulator.
6. Connect the multimeter in series with the white flame sensor wire on the ignitor.
7. After fryer has completed the melt cycle, allow burner to operate for at least one minute.
8. Check for a 2.5 to 3.5 microamp reading on the multimeter. This reading should show at
least 2.5 microamps. Adjust the combustion air-blower intake plate to obtain a
maximum microamp reading on the multimeter.
Note: Air adjustment must be made if a blue flame is observed through the burner
viewing ports, or if there are dark spots on the burner face. After 90 seconds of
continuous burner operation, the burner should glow bright orange-red. (For proper
colors, see the "BURNER COLOR COMPARISON CHART" located inside the door of
the fryer). If flame color is not correct, it is necessary to adjust the combustion air-
blower air intake-plate.
9. To adjust the blower intake plate, loosen the locking nut(s) on the intake plate with a small
adjustable wrench.
10. Adjust the plate opened or closed to obtain a maximum reading on the multimeter. When
observing the burner through the viewing ports, an orange-red glow should be seen on the
face of the burner. The ports are located directly above the spark ignitors.
11. When a maximum microamp reading and an orange-red glow have been obtained, tighten the
intake plate locking nut(s) while holding the plate to prevent movement.
Note: A blue flame observed through the burner viewing ports usually indicates
insufficient air. Dark spots on the burner face indicate excess air.
12. Recheck the recovery time as outlined on this card.
13. If further combustion air adjustments are needed, repeat Steps 9 through 12 until the
recovery time specification is met.
14. Repeat Steps 9 through 13 for each vat of the fryer.
15. Scratch calibration check is complete. Check remaining fryers.
Continued from previous
page.
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