Frymaster 47 Series Service & Parts Manual page 29

47 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1.9.2 Improper Burner Functioning (cont.)
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 1.3 of this manual, and that the pressure
remains constant throughout all hours of usage. Refer to Check Burner Manifold Pressure in
Section 1.4 if burner manifold pressure is suspected of being incorrect.
If popping is consistent during all hours of operation, verify that the pilot is properly positioned
above the burner orifice and that the pilot pressure is correct. Correct pilot pressure is indicated by a
flame 1 to 1½" long. Refer to Section 1.6 for adjustment procedure.
Clogged burner orifices, especially those near the pilot, are also likely causes of delayed ignition.
Clogged orifices are indicated by no flame, flames that are orange-colored, and flames that shoot out
at an angle from the rest.
Another cause of popping is an insufficient air supply or drafts that are blowing the pilot flame away
from the burner. 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 okay, the problem most likely is with one of the electrical
components. Examine the ignition module for signs of melting/distortion and/or discoloration due to
excessive heat build-up in the fryer. (This condition usually indicates improper flue performance.).
Also, examine the controller for the same conditions. A melted or distorted ignition module is
automatically suspect and should be replaced, but unless the condition causing excessive heat in the
fryer is corrected, the problem is likely to recur.
Next, check to ensure the ignition wire is tightly connected at both ends and examine it for 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, and holding it 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 4 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.
The burner lighting on one side only may be caused by a missing or misaligned rear deflector target
or improper burner manifold pressure. Clogged burner orifices are usually the cause of gaps in
burner firing.
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