Improper Burner Functioning - Frymaster 47 Series Service & Parts Manual

47 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
Problems Related to the Gas and/or Electrical Power Supplies
The main indicators of this are that an entire battery of fryers fails to light and/or there are no
indicator lights illuminated on the fryer experiencing ignition failure. Verify that the quick
disconnect hose is properly connected, the fryer is plugged in, the main gas supply valve is open, and
the circuit breaker for the fryer electrical supply is not tripped.
Problems Related to the Electronic Circuits
If gas and electrical power are being supplied to the fryer, the next most likely cause of ignition
failure is a problem in the 24 VAC circuit of fryers equipped with electronic ignition systems, or in
the pilot system for those without electronic ignition. If the fryer is equipped with a FootPrint III
filtration system, first verify that the drain valve is fully closed. (The valve is attached to a
microswitch that must be closed for power to reach the gas valve. Often, although the valve handle
appears to be in the closed position, the microswitch is still open.) If the valve is fully closed, or the
fryer does not have a filtration system, refer to the troubleshooting guides in this chapter.
Problems Related to the Gas Valve
If the problem is not in the 24 VAC circuit or pilot system, it is most likely in the gas valve itself, but
before replacing the gas valve refer to the troubleshooting guides in this chapter.

1.9.2 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
• Burner deflector targets out of alignment or missing
• Clogged burner orifices
• Inadequate make-up air
• Heat damage to the controller or ignition module
• A cracked ignitor or broken ignition wire
• A defective ignition module
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