Vulcan-Hart LG Series Service Manual Download Page 21

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COMPONENT FUNCTION

Thermostat . . . . . . . . . . .

Millivolt type with capillary bulb, single-throw break on temperature rise. Temperature
range of 200°F to 400°F.

Thermopile . . . . . . . . . . .

Millivolt control with 24" capillary. Rated to generate 500 millivolts.

Combination Valve . . .

Regulates gas flow to burner and pilot. Provides pilot safety.

High Limit . . . . . . . . . . . .

Prevents overheating of fryer in the event of thermostat failure. Opens at 465°F and
automatically resets at 415°F.

LG Series Fryer - ELECTRICAL OPERATION

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F45691 (1117)

Summary of Contents for LG Series

Page 1: ...ls required to perform the procedure Procedures for which you do not have the necessary tools instruments and skills should be performed by a trained Vulcan Service Technician The reproduction transfer sale or other use of this Manual without the express written consent of Vulcan is prohibited This manual has been provided to you by ITW Food Equipment Group LLC ITW FEG without charge and remains t...

Page 2: ...D ADJUSTMENTS 12 TURNING FRYER OFF 12 LIGHTING PILOT 12 DRAIN FRYER TANK 13 MILLIVOLT CONTROLS TEST 13 THERMOSTAT CALIBRATION 14 PILOT ADJUSTMENT 14 BURNERS NOZZLES AND ORIFICES 15 COMBINATION VALVE REGULATOR ADJUSTMENT 16 EXTENDED SHUT DOWN 17 DIAGRAMS 18 SCHEMATIC 18 WIRING DIAGRAM 19 ELECTRICAL OPERATION 20 CONTROL SYSTEM DESCRIPTION 20 SYSTEM CONDITION QUICK CHECK PROCEDURE 20 COMPONENT FUNCTI...

Page 3: ...the Installation Operation Manual sent with each unit The manual is also available online at www vulcanequipment com TOOLS Standard Standard set of hand tools VOM with minimum of NFPA 70E CATIII 600V UL CSA TUV listed Sensitivity of at least 20 000 ohms per volt Meter leads must also be rated at CAT III 600V Temperature tester thermocouple type ESD Electrostatic discharge Protection Kit Special Ma...

Page 4: ...everse procedure to install Heat Shield 1 Remove DOOR 2 Remove heat shield mounting screws Fig 2 3 Angle heat shield to remove Fig 3 4 Reverse procedure to install Back Panel 1 Remove rear panel mounting screws Fig 4 2 Reverse procedure to install Flue Wrap 1 Remove screws securing flue wrap LG Series Fryer REMOVAL AND REPLACEMENT OF PARTS F45691 1117 Page 4 of 23 ...

Page 5: ...ling bottom of burner forward to clear burner nozzle 4 Reverse procedure to install THERMOSTAT Oil may be hot when draining fryer tank Shut off the gas before servicing the unit and follow lockout tagout procedures 1 DRAIN FRYER TANK NOTE Steps to remove Heat Shield can be skipped if back of fryer is accessible Remove BACK PANEL to access thermostat probe packing nut 2 Remove HEAT SHIELD 3 Remove ...

Page 6: ... assembly 10 Reverse procedure to install Take care not to kink thermostat capillary when installing Wrap threads of packing nut with teflon tape to prevent leakage HIGH LIMIT THERMOSTAT Shut off the gas before servicing the unit and follow lockout tagout procedures 1 DRAIN FRYER TANK 2 Remove HEAT SHIELD 3 Remove LEFT BURNER 4 Remove high limit mounting bracket LG Series Fryer REMOVAL AND REPLACE...

Page 7: ...for leaks THERMOPILE Shut off the gas before servicing the unit and follow lockout tagout procedures All gas joints disturbed during servicing must be checked for leaks Check with a soap and water solution bubbles Do not use an open flame 1 Remove pilot assembly bracket LG Series Fryer REMOVAL AND REPLACEMENT OF PARTS Page 7 of 23 F45691 1117 ...

Page 8: ...se to install PILOT Shut off the gas before servicing the unit and follow lockout tagout procedures All gas joints disturbed during servicing must be checked for leaks Check with a soap and water solution bubbles Do not use an open flame 1 Remove HEAT SHIELD 2 Remove pilot assembly bracket LG Series Fryer REMOVAL AND REPLACEMENT OF PARTS F45691 1117 Page 8 of 23 ...

Page 9: ... install PILOT ORIFICE Shut off the gas before servicing the unit and follow lockout tagout procedures All gas joints disturbed during servicing must be checked for leaks Check with a soap and water solution bubbles Do not use an open flame 1 Remove HEAT SHIELD 2 Remove pilot assembly bracket LG Series Fryer REMOVAL AND REPLACEMENT OF PARTS Page 9 of 23 F45691 1117 ...

Page 10: ...joints disturbed during servicing must be checked for leaks Check with a soap and water solution bubbles Do not use an open flame 1 Disconnect fryer from main gas supply 2 Remove RIGHT BURNER 3 Note and disconnect wires 1 Fig 24 from combination valve 2 Fig 24 Fig 24 4 Disconnect pilot tubing 3 Fig 24 from combination valve 5 Disconnect combination valve union and pressure fitting LG Series Fryer ...

Page 11: ... gas line 2 Remove all baskets fryer basket hanger and crumb screen 3 DRAIN FRYER TANK 4 Remove HEAT SHIELD 5 Remove FLUE WRAP 6 Remove FLUE BOX 7 Remove BACK PANEL 8 Remove BURNERS and manifold bracket Fig 26 Fig 26 9 Remove THERMOSTAT 10 Remove HIGH LIMIT THERMOSTAT 11 Remove pilot assembly bracket Fig 27 12 Lift tank up and out of cabinet 13 Remove drain valve from tank 14 Reverse procedure to ...

Page 12: ...he system including pilot LIGHTING PILOT Before lighting pilot make sure tank is filled with liquid shortening Make sure gas supply to the fryer is on 1 Turn thermostat off Fig 30 2 Turn gas control valve knob to PILOT 3 Wait five minutes for unburned gas to vent 4 Push and turn the gas control valve to L in pilot Fig 31 LG Series Fryer SERVICE PROCEDURES AND ADJUSTMENTS F45691 1117 Page 12 of 23 ...

Page 13: ...y pilot flame is adjusted properly as outlined in PILOT ADJUSTMENT NOTE If the pilot is not lit light pilot Refer to LIGHTING PILOT 4 Allow pilot to burn for 3 to 4 minutes to stabilize A If pilot remains lit proceed to step 6 B If pilot will not remain lit proceed to step 5 5 Connect DC voltmeter to terminals TH TP and TH of combination valve Relight pilot hold gas control valve knob in and allow...

Page 14: ...emperature to stabilize and recheck temperature Repeat until the temperature falls within the limits as stated in step 3 under Thermostat Calibration Check 4 Install thermostat knob and set dial to 350 F 5 Allow temperature to stabilize at new setting and compare temperature tester to dial setting Recalibrate if the temperature does not fall within the range of 330 F to 370 F 6 If temperature does...

Page 15: ...follow lockout tagout procedures Burners 1 Remove BURNERS 2 Check burners for cracks or clogged ports If burner ports become clogged fryer will not operate properly If burner is cracked it must be replaced 3 Wash burners in warm soapy water 4 Hand turn a drill bit into hole with obstruction as needed to remove blockage Nozzles and Orifices 1 Remove BURNERS 2 Hold burner nozzle with channel locks a...

Page 16: ...natural or propane gas as specified on the rating plate Natural gas rating is 4 W C and propane rating is 10 W C 1 Turn gas control valve knob to OFF Fig 37 2 Remove plug from submanifold and install Manometer at this point Fig 38 3 Turn on gas and LIGHT PILOT 4 Turn gas control valve knob to ON 5 Set thermostat so burners will come on 6 Check pressure reading Manifold Manometer should match press...

Page 17: ...on EXTENDED SHUT DOWN Oil may be hot 1 Turn thermostat off 2 Push pilot knob in and turn to OFF 3 DRAIN FRYER TANK 4 Clean fryer 5 Turn off main gas shutoff valve Shut off the gas before servicing the unit and follow lockout tagout procedures LG Series Fryer SERVICE PROCEDURES AND ADJUSTMENTS Page 17 of 23 F45691 1117 ...

Page 18: ...DIAGRAMS SCHEMATIC Fig 40 NOTE High limit shown tripped LG Series Fryer DIAGRAMS F45691 1117 Page 18 of 23 ...

Page 19: ...WIRING DIAGRAM Fig 41 LG Series Fryer DIAGRAMS Page 19 of 23 F45691 1117 ...

Page 20: ...ostat connection through wire 2 to TH terminal on gas valve D If high limit trips thermopile is connected across zero ohms the output voltage of thermopile drops to 0 0 millivolts and the thermostat coil of combination valve drops out shutting the thermostat valve 3 Total Shutdown A When high limit trips 0 0 millivolts will read across both coils of the combination valve causing both valves to clo...

Page 21: ...ermopile Millivolt control with 24 capillary Rated to generate 500 millivolts Combination Valve Regulates gas flow to burner and pilot Provides pilot safety High Limit Prevents overheating of fryer in the event of thermostat failure Opens at 465 F and automatically resets at 415 F LG Series Fryer ELECTRICAL OPERATION Page 21 of 23 F45691 1117 ...

Page 22: ...hermopile function and connections Adjust or replace as required 2 Clean burner orifice and air openings as required 3 Check each post on combination valve to ground If zero resistance replace combination valve 4 Check high limit are NC contacts open Rapid shortening breakdown crumbs and specks in frying compound 1 Excessive temperature settings over 375 F 2 Shortening not being filtered regularly...

Page 23: ...fore draining oil Burners heating an empty tank will damage tank joints 3 Clean tank surfaces Pilot burner flames adjusted properly but fluctuates to very low and blows out easily 1 Gas pressure too low 2 Gas pressure too low at submanifold 1 Check gas pressure on submanifold fitting when fryer is in operation 2 Check other equipment attached to same gas line 3 Adjust gas pressure at submanifold t...

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