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Vulcan-Hart C24GA6, C24GA10, ML-136021, ML-136022 manual

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Table of contents for the manual

  • Page 1

    SER VICE MANUAL F35425 (February 2006) - NOTICE - This manual is prepared for the use of trained V ulcan Service T echnicians and should not be used by those not properly qualified. If you have attended a V ulcan Service School for this product, you may be qualified to perform all the procedures described in this manual. This manual is not intended[...]

  • Page 2

    F35425 (February 2006) Page 2 of 40 T ABLE OF CONTENTS GE NE R AL ................................................................................................................................................................ 4 Introduction ............................................................................................................[...]

  • Page 3

    F35425 (February 2006) Page 3 of 40 C24GA SERIES CONVECTION STEAMERS ELECTRICAL OPERA TION .................................................................................................................................... 2 2 Water Level Controls .....................................................................................................[...]

  • Page 4

    F35425 (February 2006) Page 4 of 40 C24GA SERIES CONVECTION STEAMERS - GENERAL GENERAL INTRODUCTION Procedures in this manual will apply to all models unless specified. Pictures and illustrations can be of any model unless the picture or illustration needs to be model specific. INST ALLA TION Refer to the Installation and Operation Manual for detai[...]

  • Page 5

    F35425 (February 2006) Page 5 of 40 REMOV AL AND REPLACEMENT OF P ARTS C24GA SERIES CONVECTION STEAMERS - REMOV AL AND REPLACEMENT OF P ARTS COVERS AND P ANELS W ARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW LOCKOUT / T AGOUT PROCEDURES. Cooking Compartment Right Side Panel 1. Remove the screws then remove the right side panel f[...]

  • Page 6

    F35425 (February 2006) Page 6 of 40 Cabinet Base Left Side Panel 1. Remove the screws then remove the left side panel from the cabinet base. Cabinet Base Front Panel 1. Remove the screws then remove the front panel from the cabinet base. C24GA SERIES CONVECTION STEAMERS - REMOV AL AND REPLACEMENT OF P ARTS Cabinet Base Rear Panel 1. Remove the scre[...]

  • Page 7

    F35425 (February 2006) Page 7 of 40 Door Gasket 1. Open the door . 2. Remove screws from the gasket guard and gasket plate. 3. Remove the gasket guard and the gasket plate. 4. Position the new gasket on the gasket plate. 5. Reverse the procedure to install. 6. Adjust the door as outlined under SERVICE PROCEDURES AND ADJUSTMENTS. Damage to the gaske[...]

  • Page 8

    F35425 (February 2006) Page 8 of 40 Door Latch Assembly 1. Open the door . 2. Remove screws from the top and bottom of the door . 3. Pull the outer door panel out from the door housing. 4. Remove the pins and retaining rings. 5. Remove the latch assembly from the door . 6. Reverse procedure to install. Use Loctite 271 to secure fasteners. COMP ARTM[...]

  • Page 9

    F35425 (February 2006) Page 9 of 40 MAIN BURNER W ARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW LOCKOUT / T AGOUT PROCEDURES. 1. Remove front and side covers as outlined under COVERS AND P ANELS. 2. Disconnect the gas line at gas combination control valve. 3. Disconnect wires to burner assembly . 4. Remove the nuts securing burn[...]

  • Page 10

    F35425 (February 2006) Page 10 of 40 1. Drain the generator and allow steamer to cool, if necessary . 2. Remove rear and side panels as outlined under COVERS AND P ANELS. 3. Disconnect gas line at gas combination control valve. 4. Disconnect wires to burner assembly . 5. Disconnect wires from gas combination control valve. 6. Remove the nuts securi[...]

  • Page 11

    F35425 (February 2006) Page 11 of 40 16 . Rotate pressure relief valve coupling to allow pressure relief valve to be rotated about 90° so that valve is below generator top level. 17. Remove pressure switch from generator . 18 . Remove bolts attaching front of generator to frame. 19 . Move any interfering components out of the way , then push gener[...]

  • Page 12

    F35425 (February 2006) Page 12 of 40 4. Disconnect the water lines for the solenoid valve being serviced and remove the solenoid valve from the unit. 5. Reverse procedure to install solenoid valve. PILOT/SP ARK PROBE FLAME SENSOR 1 . Remove main burner assembly as outlined under MAIN BURNER in REMOV AL AND REPLACEMENT OF P ARTS. 2. Remove the pilot[...]

  • Page 13

    F35425 (February 2006) Page 13 of 40 C24GA SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS SER VICE PROCEDURES AND ADJUSTMENTS W ARNING: CER T AIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR MEASURE- MENTS WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION A T ALL TIMES. IF TEST POINTS ARE NOT EASIL Y ACCESSIB[...]

  • Page 14

    F35425 (February 2006) Page 14 of 40 The screw head should not extend out past the screw housing. 1 ) If gas valve energizes, proceed to step 5. 2 ) If gas valve does not energize, check the following: a. Remove the lead wires from the switch and verify with a meter that the switch contacts are closing with the blower on. If necessary , continue to[...]

  • Page 15

    F35425 (February 2006) Page 15 of 40 C24GA SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS 16 . Turn off the machine. 1 7. Re-install pilot, reconnect wire # 35. 1 8. Turn on the machine, let generator fill 19. Observe proper functioning of gas burner . Operating Pressure Switch 1. Remove the cabinet base front panel as outlined und[...]

  • Page 16

    F35425 (February 2006) Page 16 of 40 Thumb Wheel Adjustment The thumb wheel directly below the microswitch changes both the cut-out (off) and the cut-in (on) points of the operating Pressure Switch. Turn the thumb wheel to obtain the proper cut-out (off) setting. Turning thumb wheel clockwise increases the pressure. The cut-out (off) off setting sh[...]

  • Page 17

    F35425 (February 2006) Page 17 of 40 C24GA SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS AUTOM A TIC IGNITION SYSTEMS When the main power switch is turned on and the water level is above LLCO, the ignition control module is energized with 24 volts between terminals five and six. High voltage is sent from terminal nine to the spark[...]

  • Page 18

    F35425 (February 2006) Page 18 of 40 C24GA SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS A . If 24V AC is present, then replace ignition control module and retest. It may take up to 3 seconds for the module to reset if main power is turned off then back on. B . If 24V AC is not present, then ensure that transformer is receiving 12[...]

  • Page 19

    F35425 (February 2006) Page 19 of 40 5. V erify burner air pressure is 0.35" to 0.4" W .C. 6. Turn the gas combination control valve on and wait until main burner lights. 7. Observe the manometer pressure reading and compare to the pressure chart below . GAS PRESSURE READINGS (INCHES W .C.) MANIFOLD LINE* GAS TYPE RECOMMENDED M I N MAX Na[...]

  • Page 20

    F35425 (February 2006) Page 20 of 40 C24GA SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS Striker Adjustment 1. Reinstall the striker with the slot pointing upwards and hand tighten nut only . 2. Close the door to center the striker in the oval mounting hole. 3. Open the door and check the striker’s slot for horizontal alignment.[...]

  • Page 21

    F35425 (February 2006) Page 21 of 40 10 . After 40 minutes, turn power switch off and allow steam generator to completely drain, 5 minutes. 1 1. Rinse steam generator with clean water: A . Turn power switch on. When ready light comes on, turn cooking timers on for 30 seconds to rinse the steam tubes and nozzles. B . Turn power switch off and allow [...]

  • Page 22

    F35425 (February 2006) Page 22 of 40 C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERA TION ELECTRICAL OPERA TION W A TER LEVEL CONTROLS Low Level Cut-Off and Differential Control The steamer is equipped with three water level sensing probes (high, low and low level cut-off) and a single water level control board. The water level control board pe[...]

  • Page 23

    F35425 (February 2006) Page 23 of 40 C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERA TION 1. Turn power switch on. A . Timer de-energized. 1 ) Operating voltage applied to control compartment after cavity relay is latched on. B . Water level control (WLC) energized. 1 ) Low level (LL) relay N.C. contacts provide operating voltage to fast-fill s[...]

  • Page 24

    F35425 (February 2006) Page 24 of 40 C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERA TION Compartment control (Units after Dec. 1, 2005) Refer to schematic diagrams 00855693 & 00856656. 1. Compartment door closed causing door switch to close and Ready Light to illuminate. A . 120 V AC applied through door switch to timer cont act 1 1 and 21[...]

  • Page 25

    F35425 (February 2006) Page 25 of 40 SCHEMA TIC DIAGRAMS C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERA TION Generator Schematic Diagram[...]

  • Page 26

    F35425 (February 2006) Page 26 of 40 C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERA TION Schematic Diagram - Compartment Controls (Standard)[...]

  • Page 27

    F35425 (February 2006) Page 27 of 40 C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERA TION Schematic Diagram - Compartment Controls (Constant Steam)[...]

  • Page 28

    F35425 (February 2006) Page 28 of 40 C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERA TION COMPONENT LOCA TION CABINET BASE GENERA TOR[...]

  • Page 29

    F35425 (February 2006) Page 29 of 40 C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERA TION COMPONENT FUNCTION CABINET BASE GENERA TOR Water Level Control and Level Sensing Probes................... The W ater Level Control circuit board and Level Sensing Probe Assembly allow water to enter the generator to fill and maintain the proper water leve[...]

  • Page 30

    F35425 (February 2006) Page 30 of 40 C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERA TION Hold Thermostat........................... The Hold Thermost at energizes the Generator Slow Fill Solenoid V alve when generator temperature reaches the non-adjustable setpoint at 190°F . Drain............................................. The Drain is loc[...]

  • Page 31

    F35425 (February 2006) Page 31 of 40 COMPONENT LOCA TION COOKING COMP ARTMENT C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERA TION[...]

  • Page 32

    F35425 (February 2006) Page 32 of 40 C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERA TION COMPONENT FUNCTION COOKING COMP ARTMENT General The upper section of the steamer consists of two separate cooking compartments. Each compartment functions independently with its own set of controls. Power is supplied to the controls only after the steam pr[...]

  • Page 33

    F35425 (February 2006) Page 33 of 40 C24GA SERIES CONVECTION STEAMERS - TROUBLESHOOTING General The following paragraphs provide descriptive information of the most common troubles that can occur in the steamer . The T roubleshooting Chart provides a list of other typical fault conditions. The left-hand column of the table lists typical symptoms an[...]

  • Page 34

    F35425 (February 2006) Page 34 of 40 C24GA SERIES CONVECTION STEAMERS - TROUBLESHOOTING TROUBLESHOOTING SEQUENCE OF OPERA TION STEP FUNCTION DESCRIPTION 1 Power On Power Switch is switched to the on position. 2 Fill S tage 1 Boiler fills with fast fill water valve, (3.7 GPM). 3 Low Level Probe Confirmation Low Level Probe, (LLCO), is confirmed then[...]

  • Page 35

    F35425 (February 2006) Page 35 of 40 TROUBLESHOOTING CHART SYMPTOM POSSIBLE CAUSES Compartment leaks steam or water 1. S teamer not level. around door . 2. Worn or damaged gasket. 3. Cavity rear strainer clogged. 4. Drain line obstructed. 5. Drain not to an open gap drain. Cold water condenser not operating properly . 1. Cold water condenser soleno[...]

  • Page 36

    F35425 (February 2006) Page 36 of 40 SYMPTOM POSSIBLE CAUSES Generator does not fill. 1. Water supply not on. 2. Fill solenoid not opening or plugged. 3. Water level control malfunction. 4. Filter clogged. Timer motor does not run. 1. Door open. 2. Door switch inoperative. 3. T imer not getting power . 4. Timer motor inoperative. 5. Ready light cir[...]

  • Page 37

    F35425 (February 2006) Page 37 of 40 C24GA SERIES CONVECTION STEAMERS - TROUBLESHOOTING SYMPTOM POSSIBLE CAUSES S p ark igniter not sparking. 1. Incorrect spark gap setting. 2. Poor ground between pilot bracket and burner . 3. Loose, broken or damaged lead wires (including ground) from ignition module to ignitor . 4. Ignitor boot on ignition cable [...]

  • Page 38

    F35425 (February 2006) Page 38 of 40 C24GA SERIES CONVECTION STEAMERS - CONDENSED SP ARE P A RTS LIST CONDENSED SP ARE P ARTS LIST C24GA SERIES CONVECTION STEAMERS P ART NO. DESCRIPTION 419315 POWER CORD 419359 CABLE, IGNITOR, HIGH VOL T AGE 842049 DOOR SWITCH 41 1500-12 TRANSFORMER 120V/24V 41 1690-1 TIMER COMP ARTMENT 416535-4 SWITCH RELA Y 41653[...]

  • Page 39

    F35425 (February 2006) Page 39 of 40[...]