tion failure situation may be encountered in which all components appear to be serviceable and the microamp reading is within specification, but the unit nevertheless goes into ignition failure during operation. The probable cause in this case is an intermittent failure of an ignition module. When the unit is opened up for troubleshooting, the module cools down enough to operate correctly, but when the unit is again closed up and placed back into service, the module heats up and fails.

PROBLEMS RELATED TO THE GAS VALVE

If the problem is not in the 24 VAC circuit, it is most likely in the gas valve itself, but before replac- ing the gas valve, refer to the troubleshooting guide TROUBLESHOOTING THE GAS VALVE.

6.7.2 Improper Burner Functioning

With problems in this category, the burner ignites but exhibits abnormal characteristics such as “popping,” dark spots on the burner ceramics, fluctuating flame intensity, and flames shooting out of the flue.

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:

zIncorrect or fluctuating gas pressure

zA defective, dirty, or incorrectly adjusted combustion air blower

zInadequate make-up air

zHeat damage to the controller or ignition module

zA cracked ignitor or broken/loose ignition wire

zA defective ignition module

zA cracked burner tile.

If popping occurs only during peak operating hours, the problem is most likely incorrect or fluctuat- ing gas pressure. Verify that the incoming gas pressure (pressure to the gas valve) is in accordance with the following table, and that the pressure remains constant throughout all hours of usage.

Incoming Gas Pressures

Gas

Minimum

Maximum

 

6" W.C.

14" W.C.

Natural

1.49 kPa

3.48 kPa

 

14.93 mbar

34.84 mbar

 

11" W.C.

14" W.C.

LP

2.74 kPa

3.48 kPa

 

27.37 mbar

34.84 mbar

Refer to Check Burner Manifold Pressure in the Semi-Annual Checks and Services section of Chapter 4 for the procedure for checking the gas pressure supplied to the burner.

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Frymaster FBR18 Series manual Incoming Gas Pressures, Improper Burner Functioning

FBR18 Series specifications

The Frymaster FBR18 Series stands out in the commercial kitchen arena for its innovative design, robust features, and advanced frying technologies. This series is specifically engineered to meet the demands of busy restaurants, fast-food establishments, and large-scale food service operations. With a focus on efficiency, durability, and food quality, the FBR18 Series has become a preferred choice for chefs and kitchen managers looking for reliable frying equipment.

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