Frymaster FootPrint OCF30G Service & Parts Manual page 25

If popping occurs only during peak operating hours, the problem may be incorrect or fluctuating gas pressure.
Verify that the incoming gas pressure (pressure to the gas valve) is in accordance with the appropriate CE or
Non-CE Standard found in Section 2.3 page 2-4 of the OCF30™ Series Gas Fryer Installation and Operation
Manual (PN 819-6687), and that the pressure remains constant throughout all hours of usage. Refer to
Section 1.7, Checking the Burner Manifold Gas Pressure in this manual for the procedure for checking the
pressure of gas supplied to the burner.
If popping is consistent during all hours of operation, the most likely cause is an insufficient air supply.
Check for "negative pressure" conditions in the kitchen area. If air is flowing into the kitchen area, this
indicates that more air is being exhausted than is being replenished and the burners may be starved for air.
If the fryer's gas and air supplies are correct, the problem is most likely with one of the electrical components.
Examine the ignition module and controller for signs of melting, distortion, and/or discoloration due to
excessive heat build-up in the fryer (this condition usually indicates improper flue performance). A melted or
distorted ignition module is automatically suspect and should be replaced; however, unless the condition
causing excessive heat is corrected, the problem is likely to recur.
Verify that the ignition wire is tightly connected at both ends and free of obvious signs of damage. Again, if
damage is due to excessive heat in the fryer, that problem must also be corrected. Check for proper operation
by disconnecting the wire from the ignitor (spark plug), inserting the tip of a screw driver into the terminal.
With the insulated handle of the screwdriver, hold the shaft near the frame of the fryer as the power switch is
placed in the ON position. A strong, blue spark should be generated for at least four seconds.
DANGER
Make sure you are holding the insulated handle of the screwdriver and not the blade.
The sparking charge is approximately 25,000 volts.
Examine the ignitor (spark plug) for any signs of cracking. A cracked ignitor must be replaced.
If all other causes have been ruled out, examine the burner tiles for any signs of cracking. If cracking is
found, the burner must be replaced.
Fluctuating flame intensity is normally caused by either improper or fluctuating incoming gas pressure, but
may also be the result of variations in the kitchen atmosphere. Verify incoming gas pressure in the same way
as for "popping," discussed in the preceding paragraphs. Variations in the kitchen atmosphere are usually
caused by air conditioning and/or ventilation units starting and stopping during the day. As they start and
stop, the pressure in the kitchen may change from positive or neutral to negative, or vice versa. They may
also cause changes in airflow patterns that may affect flame intensity.
Dark spots on the burner tiles are the result of an improper air/gas mixture. Adjust the combustion air
blower to reduce the amount of air in the mixture to correct this problem
Flames shooting out of the flue are usually an indication of negative pressure in the kitchen. Air is being
sucked out of the burner enclosure and the flames are literally following the air. If negative pressure is not the
cause, check for high burner manifold gas pressure in accordance with the procedures in Section 1.7.
An excessively noisy burner, especially with flames visible above the flue opening, may indicate that the gas
pressure is too high, or it may simply be that the gas valve vent tube is blocked. If the incoming gas pressure
is correct and the vent tube is unobstructed, the gas valve regulator is probably defective.
Occasionally a burner may apparently be operating correctly, but nevertheless the fryer has a slow recovery
rate (the length of time required for the fryer to increase the oil temperature from 250ºF to 300ºF (121ºC to
149ºC)). The primary causes of this include an over-filled frypot, a dirty or out-of-adjustment combustion air
blower, low burner manifold pressure, and/or damaged burner tiles. Adding oil to the frypot during the
recovery process will also cause a slow recovery rate.
If these causes are ruled out, the probable cause is a misadjusted gas valve regulator. Refer to Section 1.7,
Checking the Burner Manifold Gas Pressure, for the gas valve adjustment procedure.
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