valutazioni - 3, GPA: 4
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Verify that the ignition wire is tightly connected at both ends and free of obvious signs of damage. Again, if damage is due to excessive heat in the equipment, that problem must also be corrected. Check for proper operation by disconnecting the wire from the ignitor, inserting the tip of a screw driver into the terminal, and holding it near the frame of the unit as the power switch is placed in the on position. A strong blue spark should be generated for at least 4 seconds. DANGER Make sure the insulated handle of the screwdriver is held and not the blade. The sparking charge is approximately 25,000 volts. Examine the ignitor for any signs of cracking. A cracked ignitor must be replaced. If all other causes have been ruled out, examine the burner tiles for any signs of cracking. If found, the burner must be replaced. Fluctuating flame intensity is normally caused by either improper or fluctuating incoming gas pressure, but may also be the result of variations in the kitchen atmosphere. Verify incoming gas pressure in the same way as for popping discussed in the preceding paragraphs. Variations in the kitchen atmosphere are usually caused by air conditioning and/or ventilation units starting and stopping during the day. 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. Dark spots on the burner tiles are the result of an improper air/gas mixture. Adjust the combustion air blower to reduce the amount of air in the mixture to correct this problem. Flames shooting out of the flue are usually an indication of negative pressure in the kitchen. Air is being sucked out of the burner enclosure and the flames are literally following the air. If negative pressure is not the cause, check for high burner manifold gas pressure in accordance with the procedures in Chapter 4. An excessively noisy burner, especially with flames shooting out of the flue, may indicate that the gas pressure is too high, or it may simply be that the gas valve vent tube is blocked. If the incoming gas pressure is correct and the vent tube is unobstructed, the gas valve regulator is probably defective. 6-11 6.7.3 Improper Temperature Control Temperature control is a function of several interrelated components, each of which must operate correctly. The principle component is the temperature probe. Other components include the interface board, the water level sensors, the computer, and the ignition module. Whatever the cause, the symptom is failure of the unit to attain or maintain setpoint temperature. The unit will not call for heat unless the computer senses that the unit is full of water. Sensing is accomplished when the water level in the cookpot contacts the upper water level sensor, grounding it. If the mineral content of the water is unusually low, such as with distilled, purified, or highly filtered water, the water will not ground the sensor. If this is the cause, adding approximately .-cup of baking soda to the water will solve the problem. Similarly, if the upper water level sensor becomes encrusted with lime, starch, or some other buildup, it will not ground properly. The solution is to clean the water level sensors thoroughly with a Scotchbrite™ or similar nylon scouring pad. 6.7.4 Computer-Related Problems The computer used in FBKR18 Series rethermalizers is a specially modified Computer Magic III computer, part number 806-9396. Standard CM III computers will not operate this equipment correctly. The first thing to check if problems with the computer are experienced should be the part number. Most problems concerning the computer have to do with programming it. There are three common complaints. The complaints, their causes, and corrective actions are: 1. Fryer constantly displays HI. Cause: Setpoint incorrect or missing. Corrective Action: Press 1650, enter the correct setpoint, then press to lock in the setpoint. 2. Temperature is displayed in Celsius. Cause: Computer is programmed to display in Celsius. Corrective Action: Press 1658. 3. Temperature is constantly displayed. Cause: Computer is programmed for constant temperature display. Corrective Action: Press i65L. 6.8 Troubleshooting Guides The troubleshooting guides found in the pages that follow are intended to assist service technicians in quickly isolating the probable causes of equipment malfunctions by following a logical, step-bystep process. An additional set of operator troubleshooting guides is contained in Chapter 5. It is suggested that service technicians thoroughly familiarize themselves with both sets. 6-12 6.8.1 Troubleshooting the Gas Valve MAIN GAS SUPPLY VALVE VERIFIED TO BE OPEN AND EQUIPMENT GAS VALVE IN ON POSITION. Is 24VAC present on the main coil (PV terminal) of the gas valve? No Problem is with the 24VAC circuit. Refer to Troubleshooting the 24VAC Circuit. Yes What gas is the unit configured for? LP (Propane...