Frymaster GASFRYERSMODELS 35 - Manual (Page 21)

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Misdirected or Weak Pilot Flame
If popping is consistent during all hours of operation, check position of the pilot above the burner orifice
and verify that the pilot pressure is correct. A 1- to 1 ½-inch (25 to 38 mm) flame indicates correct pilot
pressure. Refer to Section 1.3.3 for information on pilot flame adjustment.
Clogged Burner Orifices
Clogged burner orifices, especially those near the pilot, are also likely causes of delayed ignition. Lack of
flame, flames that are orange in color, and flames that shoot out at an angle from the rest are indications
of clogged burner orifices. If only one side of the burner is lighting, the rear deflector target may be
misaligned or missing completely. Improper burner pressure may also cause this. If there are gaps in
burner firing, check for clogged burner orifices.
Inadequate Make-up Air
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 entering the kitchen than is leaving it. In a negative pressure
environment, the burners may not be receiving an adequate amount of air to maintain a strong pilot
flame.
Other Causes of Popping
Other causes of popping are more ambiguous and may have two or more possible causes to consider.
If the fryer’s gas and air supplies are okay, it is likely that the cause of the popping is one of the electrical
components. Examine the controller for signs of melting, distortion, and possibly discoloration due to
excessive heat buildup in the fryer (usually indicating improper flue performance). Automatically suspect
a discolored or distorted controller and replace it. However, it is important to diagnose and correct the
condition causing excessive heat in the fryer or the problem is likely to recur.
Fluctuating flame intensity is normally caused by improper or fluctuating gas pressure or the result
of variations in the kitchen atmosphere. Verify incoming gas pressure in the same way as for popping,
discussed in the preceding paragraphs. Air condition and ventilation units (such as hoods) starting and
stopping throughout the day usually cause variations in the kitchen atmosphere. 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.
Flames “rolling” out of the fryer
are usually an indication of negative pressure in the kitchen. The
negative air pressure is sucking air out of the fryer enclosure and the flames are following the air. If
negative pressure is not the cause, check for high burner manifold gas pressure in accordance with the
procedures in Section 1.3.2. An obstructed flue, which prevents the fryer from properly exhausting, may
also be the cause.
An unusually noisy burner, especially when flames are visible above the flue opening, may indicate
that the burner gas pressure is too high or that the gas valve vent tube is blocked. If the gas pressure is
correct and the vent tube is unobstructed, the gas valve regulator is probably defective.