Assessments - 4, GPA: 4.8
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At the same time, the electronic spark generator in the module produces a spark pulse output of over 10,000 volts. The voltage generates a spark at the igniter-sensor that lights the pilot. If the pilot does not light, or if the pilot flame current is not at least 1.0 .A and steady, the Belshaw Bros., Inc. • 1750 22nd Ave. S. • Seattle, WA 98144 • Phone 206-322-5474 • Fax 206-322-5425 718LCG, 724CG, and 734CG Gas Fryers MN-1141EN module will not energize the second main valve, and the main burner will not light. The S8600F, which is used on natural gas fryers, will continue to spark as long as the fryer’s thermostat calls for heat or until the pilot lights. The S8600H, which is used on propane fryers, provides 100 percent shutoff and safety lockout. Its ignition sparks only for a pre-set length of time (15 or 90 seconds, as stamped on the module). If the pilot does not light within the timed trial for ignition period, the module goes into safety lockout, de-energizing the first main valve operator, closing the first main pilot valve in the gas control, and stopping the flow of gas to the pilot. You must then set the fryer’s thermostat below 200°F/93°C, move the on/off switch to OFF, and wait at least one minute before trying again to light the pilot. Main Burner Operation When the pilot flame is established, a flame rectification circuit is completed between the sensor and the burner ground. The flame sensing circuit in the module detects the flame current, shuts off the spark generator, and energizes the second main valve operator. The second main valve opens and gas flows to the main burner, where it is ignited by the pilot burner. On the S8600H, the safety lockout timer is held in the normal operating mode. When the thermostat no longer calls for heat, both valve operators are de-energized, and both valves in the gas control close. Step 3: Reset the Module 1. Turn the thermostat to its lowest setting. 2. Wait at least one minute. Step 4: Check Safety Shutoff Operation This step applies only to the S8600H, which is used on propane fryers. 1. Turn the gas supply off. 2. Set the fryer’s thermostat above 200°F/93°C. Watch to see whether there is a spark at the pilot burner immediately. 3. Time the spark from the time it starts to the time it shuts off. 4. Compare this time with the shutoff time that is stamped on the module. They should be the same. 5. Open the manual gas cock and make sure that no gas is flowing to the pilot or main burner. 6. Set the fryer’s thermostat below 200°F/93°C and wait at least one minute before continuing. Belshaw Bros., Inc. • 1750 22nd Ave. S. • Seattle, WA 98144 • Phone 206-322-5474 • Fax 206-322-5425 A-2 MN-1141EN 718LCG, 724CG, and 734CG Gas Fryers START TRIAL FOR IGNITION MAIN BURNER OPERATION Thermostat calls for heat. First main valve opens. Gas flows to pilot burner. Igniter-sensor sparks. Pilot burner lights. Module sense s flame current. Pilot burne r does not light, or mod ule does not sense flame cu rrent. Module S8600H Module S8600 F Ignition spark continues. System locks out. Operator tu rns thermostatbelow 200°F/93°C, moveson/o ff switch to OFF, and waits at least one m inute . After no more than 5 minutes, operator turns thermost atbelow 200°F/93°C, moveson/off switch to OFF, and waits at least o ne minute. Sparking stops. Second main valve ope ns. Module monitors p ilot flame current. Thermostat stops calling fo r heat . Pilot flame fails. Power is interrupt ed. System shuts off. (Restarts when power is resto red.) Ma in valve closes. Valves close. Burners shu t off. Figure A-1. Normal Operating Sequence. Belshaw Bros., Inc. • 1750 22nd Ave. S. • Seattle, WA 98144 • Phone 206-322-5474 • Fax 206-322-5425 718LCG, 724CG, and 734CG Gas Fryers MN-1141EN Step 5: Check Normal Operation 1. Set the fryer’s thermostat above 200°F/93°C. 2. Watch to see whether the pilot lights smoothly when the gas reaches the pilot burner. 3. Watch to see whether the main burner lights smoothly without flashback. 4. Watch to see whether the main burner operates smoothly without floating, lifting, flame rollout, or heat buildup. 5. If the gas line has been disturbed, perform a gas leak test, as follows: a. Paint the gas control gasket edges and all pipe connections downstream of the gas control, including pilot tubing connections, with a rich solution of soap and water. Bubbles in the solution indicate gas leaks. b. If there are leaks, tighten the joints or screws, or replace the component. c. Test again for leaks. d. Repeat this procedure until no leaks exist. 6. Set the thermostat below 200°F/93°C. Watch to see whether the main burner flame and the pilot flame go out. Troubleshooting—General The following service procedures are provided as a general guide. For electrical troubleshooting refer to the diagrams included with this manual, or to the wiring schematic on the inside of the fryer door. Keep the following things in mind: • On lockout and retry models, meter readings between gas co...
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