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MASTER JET CF SERIES ATMOSPHERIC GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-22
1.9.2 Improper Burner Functioning
The burner ignites but exhibits abnormal characteristics such as "popping", incomplete lighting of
the burner, fluctuating flame intensity, and flames "rolling" out of the fryer.
"Popping" indicates delayed ignition. In this condition, the main gas valve is opening but the
burner is not immediately lighting. When ignition does take place, the excess gas "explodes" into
flame, rather than smoothly igniting.
The primary causes of popping are:
• Incorrect or fluctuating gas pressure
• Misdirected or weak pilot flame
• Burner deflector targets out of alignment or missing
• Clogged burner orifices
• Inadequate make-up air
• Clogged vent tube, causing incorrect gas pressure
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 standards found in the tables on Pages 1-5 and 1-6, and that the pressure
remains constant throughout all hours of usage. Refer to Section 1.3 for the procedure for checking
the burner gas pressure.
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 1-½" (25 to 38 mm) long. Refer to Section 1.4 for the pilot flame 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 when the door is
opened to the kitchen and a rush of incoming air is felt, this indicates that more air is being
exhausted than is being replenished and the burners may have insufficient combustion air.
If the fryer’s gas and air supplies are okay, the problem most likely is with one of the electrical
components. Examine the computer for signs of melting/distortion and/or discoloration due to
excessive heat buildup in the fryer. (This condition usually indicates improper flue performance.).
A discolored or distorted computer should be replaced immediately. To prevent recurring problems,
correct the condition immediately.
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.