Vulcan-Hart C24GA10 Service Manual Download 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.

11. 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 steam

generator to completely drain.

C.

Turn cooking timers to off.

D.

Repeat steam generator rinse one time.

12. Clean exterior and interior using a mild solution

of soap and water. Rinse with clean water then
dry with a soft cloth. Leave compartment doors
open when not in use.

13. The steamer is ready for operation or shutdown.

COOKING CYCLE TEST

General

During a cooking cycle, the gas heating system will
cycle on and off as necessary to maintain steam
pressure in the generator. When the steam pressure
in the steam generator reaches 4 psi for the first time
after machine is switched on, the steam header
pressure relay latches on and supplies power to
compartment controls. Ready light will illuminate
(header pressure relay remains latched until the
machine is switched off).

Test operation of the cooking compartment controls.

 1. With both timer knobs at the off position, open

the compartment doors.

 2. Observe that no steam has entered the cooking

compartments.

 3.

Close the doors.

 4. Set both timer knobs at 2 minutes.

 5. Confirm that the ready lights go off, the cooking

lights come on, and steam begins to enter the
compartments.

 6.

After one minute, open both doors.

 7. Observe that steam has ceased to enter each

compartment, cooking lights go back to ready,
and one minute is remaining on each cook timer.

 8.

Close the doors.

 9. Confirm that steam delivery and cook timing

resume.

C24GA SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS

10. Observe the floor drain to ensure that live steam

from the compartments is being cooled by cold
water from the cold water condenser solenoid
valve.

11. When the timer knobs reach 0, confirm that the

buzzers sound, steam delivery ceases, cooking
lights go off, and ready lights come on.

12. To silence the buzzers, turn the timer knobs to

off position.

13. Turn the main power switch off to remove power

from the steamer, and confirm that the red light
goes out and generator drains.

PROBE INSPECTION

It is recommended that the generator be thoroughly
inspected for excessive scale and lime build-up on a
quarterly basis. In hard water areas or for units heavily
used, a shorter interval should be used. This inspec-
tion consists of the following:

Drain Plug -

Remove clean-out port plug to check
for scale.

Probe -

A check of lime build-up on the water
level probe assembly.

Controls -

A check of all generator controls,
including the pressure switches.

Summary of Contents for C24GA10

Page 1: ...o perform to determine if you have the necessary tools instruments and skills required to perform the procedure Procedures for which you do not have the necessary tools instruments and skills should b...

Page 2: ...ssembly 6 Door Gasket 7 Door Handle 7 Door LatchAssembly 8 Compartment Controls 8 Main Burner 9 Gas Combination Control Valve 9 GeneratorAssembly 9 Fill and Cold Water Solenoid Valves 11 Pilot Spark P...

Page 3: ...Cabinet Base Generator 29 Component Location Cooking Compartment 31 Component Function Cooking Compartment 32 General 32 TROUBLESHOOTING 33 General 33 Water Not Being Supplied to Generator 33 Pilot O...

Page 4: ...ng instructions SPECIFICATIONS Gas Line Pressures Operating Pressure Natural Recommended 2 5 W C Propane Recommended 10 0 W C Incoming Pressure Natural Recommended 7 0 W C min Propane Recommended 11 0...

Page 5: ...ooking Compartment Right Side Panel 1 Remove the screws then remove the right side panel from the compartment Cooking Compartment Flue Wrap 1 Remove left and right side panels from compartment Remove...

Page 6: ...base C24GASERIES CONVECTION STEAMERS REMOVALAND REPLACEMENT OF PARTS Cabinet Base Rear Panel 1 Remove the screws then remove the rear panel from the cabinet base COOKING COMPARTMENT DOOR Door Assembl...

Page 7: ...et sealing surface such as nicks or cuts will cause steam leakage Door Handle 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...

Page 8: ...6 Reverse procedure to install Use Loctite 271 to secure fasteners COMPARTMENT CONTROLS WARNING DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW LOCKOUT TAGOUT PROCEDURES 1 Remove compartment...

Page 9: ...K ALL JOINTS BEYOND GAS VALVE SOLENOID AFTER UNIT IS LIT Gas combination control valves are not serviceable and should not be disassembled Once the problem has been isolated to this control replace it...

Page 10: ...nd operating pressure switch 9 Loosen hose clamp attaching lower flexible water line at back panel and use a wrench to disconnect barb fitting from main inlet water connection 10 Loosen hose clamp att...

Page 11: ...y then push generator slightly forward to disengage feet and remove generator from rear of cabinet 20 Reverse procedure to install generator FILL AND COLD WATER SOLENOID VALVES WARNING DISCONNECT THE...

Page 12: ...R 1 Removemainburnerassemblyasoutlinedunder MAINBURNERinREMOVALANDREPLACEMENT OFPARTS 2 Remove the pilot assembly by disconnecting gas tube to the pilot burner and remove screws holding pilot assembly...

Page 13: ...rocedure The air pressure switch senses the pressure level produced by the blower for combustion When the pressure is sufficient the switch closes and supplies power to the ignition control module The...

Page 14: ...ackon A Listen or use a meter for gas pilot ignition to verify operation 1 If gas pilot ignition is successful listen for main gas burner ignition to verify operation B Verify the pilot and main burne...

Page 15: ...er Operating Pressure Switch 1 Remove the cabinet base front panel as outlined under COVERSAND PANELS Pressure switch is located behind control box 2 Turn the power on and let the generator come up to...

Page 16: ...eel clockwise increases the pressure The cut out off off setting should be 3 5 to 4 psi Inlet Water Steam Strainer 1 Unscrew the cap from the body 2 Remove the screen and any foreign particles trapped...

Page 17: ...flame remains adequate 2 Common MV PV 3 The Pilot Voltage 24 VAC will be present on terminal 3 at the instant an input voltage is supplied to the module This voltage will remain present on terminal 3...

Page 18: ...ace the pilot igniter assembly 3 Check the ignition cable for tightness or damaged insulation 4 Check unit for proper operation Inspect the pilot burner orifice This should be approxi mately 1 8 in di...

Page 19: ...SCHEMATICS under ELECTRICAL OPERATION 4 Check that timer motor operates when connected to power If a problem is found in timer replace it do not take timer apart C24GASERIES CONVECTION STEAMERS SERVIC...

Page 20: ...RE HOT USE CARE WHEN OPERATING CLEANING OR SERVICING THE STEAMER THE COOKING COMPARTMENT CONTAINS LIVE STEAM STAY CLEAR WHEN OPENING DOOR Items Required not provided Deliming material Funnel Plastic o...

Page 21: ...team has entered the cooking compartments 3 Close the doors 4 Set both timer knobs at 2 minutes 5 Confirm that the ready lights go off the cooking lights come on and steam begins to enter the compartm...

Page 22: ...l solenoid is energized and water begins filling the generator When the water level reaches the low level cut off LLCO probe the LLCO relay is energized and illuminates the LLCO LED With the LLCO 2 co...

Page 23: ...closes energizing the slow fill solenoid to keep generator full E When generator pressure reaches 4 psi the pressure switch N C contacts open the N O contacts close 1 Voltage is removed from a Air pr...

Page 24: ...wing steam into compartment 4 Cavity relay 1 energized energizing the CWC solenoid 5 Cook Light illuminated D Timer times out 1 Contacts 11 13 open and contacts 11 and 14 close energizing the buzzer 2...

Page 25: ...F35425 February 2006 Page 25 of 40 SCHEMATIC DIAGRAMS C24GASERIES CONVECTION STEAMERS ELECTRICALOPERATION Generator Schematic Diagram...

Page 26: ...F35425 February 2006 Page 26 of 40 C24GASERIES CONVECTION STEAMERS ELECTRICALOPERATION Schematic Diagram Compartment Controls Standard...

Page 27: ...F35425 February 2006 Page 27 of 40 C24GASERIES CONVECTION STEAMERS ELECTRICALOPERATION Schematic Diagram Compartment Controls Constant Steam...

Page 28: ...F35425 February 2006 Page 28 of 40 C24GASERIES CONVECTION STEAMERS ELECTRICALOPERATION COMPONENT LOCATION CABINET BASE GENERATOR...

Page 29: ...d Water Condenser CWC Solenoid Valve The Cold Water Condenser CWC Solenoid Valve allows cold water to flow into the generator drain to condense steam and cool the hot water before it is discharged int...

Page 30: ...ber burner The blower is accessible through the front of the base Blower Air Pressure Switch The Blower Air Pressure Switch is part of the Burner Assembly and closes at 0 4 W C to apply operating volt...

Page 31: ...F35425 February 2006 Page 31 of 40 COMPONENT LOCATION COOKING COMPARTMENT C24GASERIES CONVECTION STEAMERS ELECTRICALOPERATION...

Page 32: ...ly after the generator has reached its operating pressure Also the timer energizes the buzzer when time expires The timer can be set to the constant steam position This allows steam to flow into the c...

Page 33: ...scalants or lime build up is apparent then not only the drain solenoid valve but also the generator and water level control must be thoroughly cleaned TROUBLESHOOTING Water Accumulating in Compartment...

Page 34: ...190 F thermostat supplies signal to water level control to continue filling with trickle valve 0 25 GPM 12 Generator Full Boiler will fill till high water probe is confirmed 13 Ready Operating pressur...

Page 35: ...alfunction 3 Dirt or scale on valve seat Generator will not heat or build pressure 1 Incorrect input voltage 2 Generator not filled 3 Water Level Control malfunction 4 Water too pure for probes to pro...

Page 36: ...rner won t light or won t stay lit 1 Gas not on 2 Combustion air pressure switch malfunction 3 Ignition module not receiving power 4 Unit not properly grounded and or polarity of incoming power is inc...

Page 37: ...and burner 3 Loose broken or damaged lead wires including ground from ignition module to ignitor 4 Ignitor boot on ignition cable loose damaged or missing causing excessive ignition voltage leakage 5...

Page 38: ...NE 850778 1 PRESSURE SWITCH AIR 852984 10 MAIN BURNER ORIFICE PROPANE 852984 9 MAIN BURNER ORIFICE NATURAL 855268 1 DOOR GASKET C24GA6 855286 2 DOOR GASKET C24GA10 855373 1 SOLENOID SLOW FILL 0 25 GPM...

Page 39: ...F35425 February 2006 Page 39 of 40...

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