Frymaster FLAT BOTTOM 2424G - Manual (Page 26)

24G SERIES FLATBOTTOM GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-21
1.8.2 Improper Burner Functioning
With problems in this category, the burner ignites but exhibits abnormal characteristics such as
"popping", incomplete lighting of 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 (non-electronic ignition)
• Clogged burner orifices
• Clogged burners
• Inadequate make-up air
• Heat damage to the controller or ignition module
• An out-of-adjustment ignitor or broken ignition wire
• A defective ignition module
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 requirements listed in the Installation and Operation manual that came
with the fryer, and that the pressure remains constant throughout all hours of usage. Refer to
Adjusting 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 1.5 for pilot adjustment procedure.
On systems equipped with electronic ignition, verify that the ignitor is properly adjusted (electrode
tip and ignitor positioned properly over middle burner).
Clogged burners and burner orifices are also likely causes of delayed ignition. Clogged burners are
indicated by uneven flame or partial flame on the burner face. Clogged orifices are indicated by no
flame.
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, more air is being exhausted than is being replenished and the burners may be
starved for air.