Frymaster FBRA18 Series manual Ignition Failures

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knowledge of possible problems, and the probable causes of each. With this knowledge, the techni- cian should be able to isolate and correct any problem encountered.

Problems that are likely to be encountered can be grouped into five broad categories:

1.Ignition failures

2.Improper burner functioning

3.Improper temperature control

4.Controller-related problems

5.Autofill system problems.

The probable causes of each category are discussed in the following sections. A series of trouble- shooting guides (decision trees) is also included at the end of the chapter to assist in identifying some of the more common problems.

6.7.1 Ignition Failures

Ignition failure occurs when the ignition module fails to sense a flame within 4 seconds and locks out. When this happens, the module sends 24 VAC through the interface board alarm circuit to the controller and the trouble light on the timer control panel lights.

The three primary reasons for ignition failure, listed in order of probability, are:

1.Problems related to the gas and/or electrical power supplies.

2.Problems related to the electronic circuits.

3.Problems related to the gas valve.

PROBLEMS RELATED TO THE GAS AND/OR ELECTRICAL POWER SUPPLIES

The main indicator of a problem with the electrical power supply is that there are no indicator lights illuminated on the unit. The main indication of a problem with the gas supply is failure of the unit to fire. Verify that the gas line quick-disconnect fitting (if used) is properly connected, the unit is plugged in, the main gas supply valve is open, and the circuit breaker for the unit’s electrical supply is not tripped.

PROBLEMS RELATED TO THE ELECTRONIC CIRCUITS

If gas and electrical power are being supplied to the rethermalizer, the next most likely cause of igni- tion failure is a problem in the 24 VAC circuit. First, verify that the drain valve is fully closed. (The drain valve assembly includes 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 drain valve is fully closed, refer to the troubleshooting guide TROUBLESHOOTING THE 24 VAC CIRCUIT.

Some typical causes of ignition failure in this category include a defective sensing wire in the ignitor assembly, a defective module, a defective ignition wire, or a defective ignitor. Occasionally an igni-

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Contents Hour Service Hotline Canada Page FBR18 & FBRA18 Series GAS Rethermalizers Table of Contents Parts List Parts Ordering and Service Information Safety InformationInstallation, Operating, and Service Personnel Equipment DescriptionDefinitions Shipping Damage Claim Procedure What to do if your equipment arrives damagedGeneral Installation Requirements Caster/Leg Installation Incoming Gas Pressures Connecting to the Gas Supply Converting to Another Gas Type Introduction FBR18/FBRA18 Digital ControllerOperating the FBR18/FBRA18 Timers Boiling-Out the Cookpot Shutting the Rethermalizer Down Daily Checks and Services Quarterly Checks and ServicesSemi-Annual Checks and Services Clean Combustion Air BlowerCheck Burner Manifold Pressure Burner Manifold Gas Pressures Introduction Troubleshooting Guides To FBRA18 units onlyProblem Yes Has the correct setpoint Yes Replacing the Controller or Controller Wiring Harness FBR18 & FBRA18 Series GAS Rethermalizers Service Procedures Functional DescriptionController and Mechanical Timers Temperature Probe Cleaning the Gas Valve Vent Tube Checking the Burner Manifold Gas PressureMeasuring Flame Current Replacing the Temperature Probe Replacing the Interface BoardReplacing an Ignitor Assembly Replacing an Ignition ModuleReplacing a Burner Assembly Replacing the Combustion Air BlowerReplacing the Gas Valve Troubleshooting and Problem Isolation Replacing the CookpotIgnition Failures Incoming Gas Pressures Improper Burner FunctioningPage Improper Temperature Control Troubleshooting the Gas Valve Troubleshooting the 24 VAC Circuit in FBR18 Units Unit is Connected to24 VAC Circuit in FBR18 Units Troubleshooting the 24 VAC Circuit in FBRA18 Units Is PowerIs 24VAC Present on COM No terminal of latch Relay? Harness Is J1 pin 24VAC Circuit in FBRA18 Units Troubleshooting the Temperature Probe Probe Resistance Chart Wiring Diagram for FBR18 Units 8050417DFBRA18 Units FBR18 & FBRA18 Series GAS Rethermalizers Parts List Burner System ComponentsCabinetry and Associated Components Control Box Assembly and Associated Parts, FBR18/ FBRA18 Controller and Component Box Assemblies Cooking Timer Control Panel Components Cookpot, FBR18 Cookpot, FBRA18 Gas Supply Components Plumbing Components Page Service Hotline
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