Instruction/ maintenance manual of the product ML-136058 Vulcan-Hart
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A product of VULCAN-HART LOUISVILLE, KY 40201-0696 F35453 (July 2008) - NOTICE - This Manual is prepared for the use of trained Vulcan Service Technicians and should not be used by those not properly qualified. If you have attended a Vulcan Service School for this product, you may be qualified to perform all the procedures described in this manual.
MODEL C24EA F35453 (July 2008) Page 2 of 68 TABLE OF CONTENTS G E N E R A L ................................................................................ 3 C O V E R S A N D P A N E L S ..............................................................
MODEL C24EA - GENERAL F35453 (July 2008) Page 3 of 68 GENERAL INTRODUCTION This manual is applicable to the models and ML numbers listed on the cover page. Procedures apply to all models unless specified otherwise. Steam Cooking Convection steamers offer an efficient way to produce many foods in either small portions or larger batches.
MODEL C24EA - GENERAL F35453 (July 2008) Page 4 of 68 Other chemical properties in water supplies can also affect good steam generation and vary from within each state and locality. The water level probes in the steam generator use ions in the water to detect the water level.
MODEL C24EA - COVERS AND PANELS F35453 (July 2008) Page 5 of 68 COVERS AND PANELS FRONT BASE PANEL 1. Remove screws from the bottom of panel. 2. Pull bottom of panel out and slide down to clear tabletop cover.
MODEL C24EA - COVERS AND PANELS F35453 (July 2008) Page 6 of 68 REAR BASE PANEL 1. Remove electrical power connection to machine. 2. Turn off water supply and disconnect plumbing to machine. 3. Remove screws securing water valves to panel. 4. Remove screws from the bottom of panel.
MODEL C24EA - DOOR F35453 (July 2008) Page 7 of 68 DOOR REMOVAL 1. Close door. 2. Remove COOKING COMPARTMENT LEFT SIDE PANEL as outlined under COVERS AND PANELS. 3. Remove nuts from upper hinge located inside front panel. 4. Open door slightly, and while holding door, pull upper hinge away from front panel.
MODEL C24EA - DOOR F35453 (July 2008) Page 8 of 68 DOOR HANDLE Removal 1. Open door. 2. Remove screws from top and bottom of door assembly. 3. Pull outer door housing away from inner door panel starting at the hinge side of door to separate the door halves.
MODEL C24EA - DOOR F35453 (July 2008) Page 9 of 68 LATCH ASSEMBLY Removal and Disassembly 1. Separate outer door housing assembly from inner door panel as outlined under DOOR HANDLE. 2. Remove screws securing latch assembly to inner door panel and remove latch mechanism.
MODEL C24EA - DOOR F35453 (July 2008) Page 10 of 68 Installation 1. Install latch assembly onto inner door panel with spring pin toward bottom of door panel. A. Apply Loctite 271 to threads of screws before assembly and secure latch assembly to inner door panel.
MODEL C24EA - DOOR F35453 (July 2008) Page 11 of 68 B. Locate the striker that catches on door latch near steam chamber on front panel. C. Remove the nut from striker and this should release it from the panel. D. Open door. 2. Remove striker. 3. Remove any burrs on striker that may cause latch to stick.
MODEL C24EA - THERMOSTATS AND HIGH LIMITS F35453 (July 2008) Page 12 of 68 THERMOSTAT AND HIGH LIMITS HEAT EXCHANGER HIGH LIMIT 1. Turn off machine to drain steam generator. Allow steamer to complete drain cycle. 2. Remove RIGHT SIDE BASE PANEL as outlined under COVERS AND PANELS.
MODEL C24EA - THERMOSTATS AND HIGH LIMITS F35453 (July 2008) Page 13 of 68 8. Remove capillary tube from heating element. Installation 1. Route capillary bulb through the opening in heating element mounting plate. Ensure there are no sharp bends in capillary tubing while installing.
MODEL C24EA - TIMERS F35453 (July 2008) Page 14 of 68 TIMERS REMOVAL AND REPLACEMENT NOTE: When the timer reaches zero, an external buzzer will sound and steam will stop entering the cooking compartment. The constant steam setting allows for continuous steam operation.
MODEL C24EA - HEATING ELEMENTS AND CONTACTORS F35453 (July 2008) Page 15 of 68 HEATING ELEMENTS AND CONTACTORS REMOVAL AND REPLACEMENT Heating Elements 1. Turn off machine to drain steam generator. Allow steamer to complete drain cycle. A. Turn off water supply.
MODEL C24EA - HEATING ELEMENTS AND CONTACTORS F35453 (July 2008) Page 16 of 68 Contactors 1. Turn off machine to drain steam generator. Allow steamer to complete drain cycle. 2. Remove FRONT BASE PANEL as outlined under COVERS AND PANELS. 3. Remove top screw securing cover to high voltage box.
MODEL C24EA - HEATING ELEMENTS AND CONTACTORS F35453 (July 2008) Page 17 of 68 3. If unable to check current draw, a resistance check may indicate a malfunctioning element. A. Turn power switch off and disconnect power to machine. B. Disconnect heating element lead wires and check t he individual element resistance using a VOM.
MODEL C24EA - HEAT EXCHANGER ELEMENTS AND RELAYS F35453 (July 2008) Page 18 of 68 HEAT EXCHANGER ELEMENTS AND RELAYS REMOVAL AND REPLACEMENT Heat Exchanger Elements 1. Turn off machine to drain steam generator. Allow steamer to complete drain cycle. A.
MODEL C24EA - HEAT EXCHANGER ELEMENTS AND RELAYS F35453 (July 2008) Page 19 of 68 6. Reassemble parts removed in reverse order. Apply pipe thread sealant to threads of heat exchanger element before assembly. 7. Check steamer for proper operation and leaks around heat exchanger element.
MODEL C24EA - HEAT EXCHANGER ELEMENTS AND RELAYS F35453 (July 2008) Page 20 of 68 3. If unable to check current draw, a resistance check may indicate a malfunctioning element. A. Turn power switch off and disconnect power to machine. B. Disconnect heat exchanger element lead wires and check resistance using a VOM.
MODEL C24EA - WATER LEVEL CONTROL COMPONENTS F35453 (July 2008) Page 21 of 68 WATER LEVEL CONTROL COMPONENTS WATER LEVEL CONTROL - LOW LEVEL CUT-OFF AND DIFFERENTIAL OPERATION The steamer is equipped with three water level sensing probes (high, low and low level cut-off) and a water level control.
MODEL C24EA - WATER LEVEL CONTROL COMPONENTS F35453 (July 2008) Page 22 of 68 WATER LEVEL CONTROL 1. Remove FRONT BASE PANEL as outlined under COVERS AND PANELS. 2. Squeeze tab on plastic standoffs (5) to release water level control. 3. Note electrical connections then disconnect lead wires from water level control (WLC).
MODEL C24EA - WATER LEVEL CONTROL COMPONENTS F35453 (July 2008) Page 23 of 68 DUAL WATER VALVES SHOWN FILTERED AND NON-FILTERED DUAL WATER SOLENOID VALVES NOTE: The filtered and non-filtered water solenoid valves are constructed as dual water valve assemblies.
MODEL C24EA - WATER LEVEL CONTROL COMPONENTS F35453 (July 2008) Page 24 of 68 6. Remove screws (2) securing dual water solenoid valve to rear panel. 7. Reassemble parts removed in reverse order. 8. Verify water supply is connected to the correct dual water solenoid valve (filtered or non filtered).
MODEL C24EA - WATER LEVEL CONTROL COMPONENTS F35453 (July 2008) Page 25 of 68 NOTE: When installing, align the flat on delime valve stem and the locking pins on delime valve to the motorized control assembly. NOTE: The two electrical plugs on the motorized control assembly are identical.
MODEL C24EA - SWITCHES, SOLENOIDS, RELAY, AND BUZZER F35453 (July 2008) Page 26 of 68 SWITCHES, SOLENOIDS, RELAYS AND BUZZER POWER AND DELIME SWITCHES 1. Remove COOKING COMPARTMENT RIGHT SIDE PANEL as outlined under COVERS AND PANELS. 2. Locate switch on front panel.
MODEL C24EA - SWITCHES, SOLENOIDS, RELAY, AND BUZZER F35453 (July 2008) Page 27 of 68 Installation 1. Verify E-clip is installed on door switch linkage in groove nearest front panel. 2. Loosely install door switch onto door switch mounting bracket. A.
MODEL C24EA - SWITCHES, SOLENOIDS, RELAY, AND BUZZER F35453 (July 2008) Page 28 of 68 Check NOTE: Pressure can be checked with the small air pocket that exists between the delime port cap and water level probe housing in the delime hose. Make certain that no leaks exist in the steam generator connections or pressure gauge fittings.
MODEL C24EA - SWITCHES, SOLENOIDS, RELAY, AND BUZZER F35453 (July 2008) Page 29 of 68 B. Check cut-out pressure after making adjustment. Repeat Check and Adjustment as necessary until cut-out pressure is within 3.5 to 3.7 psi. PRESSURE SWITCH (2PAS) 1.
MODEL C24EA - SWITCHES, SOLENOIDS, RELAY, AND BUZZER F35453 (July 2008) Page 30 of 68 COMPARTMENT STEAM SOLENOID 1. Turn off machine to drain steam generator. Allow steamer to complete drain cycle. 2. Remove RIGHT SIDE BASE PANEL as outlined under COVERS AND PANELS.
MODEL C24EA - SWITCHES, SOLENOIDS, RELAY, AND BUZZER F35453 (July 2008) Page 31 of 68 BUZZER 1. Remove COOKING COMPARTMENT RIGHT SIDE PANEL as outlined under COVERS AND PANELS. 2. Locate buzzer on the door switch mounting bracket. 3. Disconnect electrical wiring from the buzzer and door switch.
MODEL C24EA - CONTROL BOARD F35453 (July 2008) Page 32 of 68 CONTROL BOARD REMOVAL AND REPLACEMENT 1. Remove FRONT BASE PANEL as outlined under COVERS AND PANELS. 2. Disconnect electrical connectors from control board. 3. Squeeze tab on plastic standoffs (10) to release control board.
MODEL C24EA - CONTROL BOARD F35453 (July 2008) Page 33 of 68 LAYOUT AND LED LEGEND The control board provides a central location for wire harness connections and power transfer through board relays (K1-K9, and K11) and time delay relays (delime 1, delime 2 and drain) to the steamer controls.
MODEL C24EA - CONTROL BOARD F35453 (July 2008) Page 34 of 68 STEAM GENERATOR OPERATIONAL STATUS (LED INDICATORS) Use the tables below to determine the operational stat us of a component or condition by utilizing the LED indicators on the board. The sections are divided according to their operational step.
MODEL C24EA - CONTROL BOARD F35453 (July 2008) Page 35 of 68 Water Level at LLCO Probe • LLCO LED is on (water level control) (LED is on until water drops below LLCO probe). • All contactors energized (steam generator begins heating). • Water fill of the steam generator changes to slow fill rate.
MODEL C24EA - CONTROL BOARD F35453 (July 2008) Page 36 of 68 Steam Generator at Operating Pressure • Ready lights (1LT) (green) lit for the upper and lower compartments.
MODEL C24EA - CONTROL BOARD F35453 (July 2008) Page 37 of 68 Timers Reach Zero (Upper and lower Compartments) • Buzzer sounds until timer turned to off, constant or additional time is set. • Cook lights (2LT) (red) turn off and cooking compartment steam solenoids de-energize.
MODEL C24EA - CONTROL BOARD F35453 (July 2008) Page 38 of 68 DELIMING CYCLE STATUS (LED INDICATORS) • Conditions same as listed under STARTING CONDITIONS. • Delime time delay relay 2 (TDR) and drain time delay relay (TDR) jumpers on the control board are set at their default times as shown on the schematic.
MODEL C24EA - CONTROL BOARD F35453 (July 2008) Page 39 of 68 Water Level at LLCO Probe • LLCO LED is on (water level control) (LED is on until water drops below LLCO probe). • All contactors energized (steam generator begins heating). • Water fill of the steam generator changes to slow fill rate.
MODEL C24EA - CONTROL BOARD F35453 (July 2008) Page 40 of 68 Steam Generator at Operating Pressure • All contactors de-energized (heating stops). LED STATUS COMPONENT DESCRIPTION ON OFF 1 X Same as Starting Conditions 2X Same as Water Level at LLCO Probe Limiting contactor (1CON) remains energized with the water level satisfied (LLCO probe).
MODEL C24EA - CONTROL BOARD F35453 (July 2008) Page 41 of 68 LED STATUS COMPONENT DESCRIPTION ON OFF 1 X Same as Starting Conditions 3X Regulating contactor 1 (2CON) de- energized. Power removed from heating elements. 5 X Relay (K1) de-energized. Pressure switch (1PAS) contacts close.
MODEL C24EA - HEAT EXCHANGER F35453 (July 2008) Page 42 of 68 HEAT EXCHANGER REMOVAL AND REPLACEMENT 1. Turn off machine to drain steam generator. Allow steamer to complete drain cycle. A. Turn off water supply. 2. Remove FRONT and RIGHT SIDE BASE PANELS as outlined under COVERS AND PANELS.
MODEL C24EA - HEAT EXCHANGER F35453 (July 2008) Page 43 of 68 MOTORIZED DELIME VALVE NOTE: The motorized delime valve (normally closed) can be opened or closed manually by pushing in on the manual override knob on top of the valve to disengage the gear set.
MODEL C24EA - STEAM GENERATOR F35453 (July 2008) Page 44 of 68 STEAM GENERATOR REMOVAL AND REPLACEMENT 1. Turn off machine to drain steam generator. Allow steamer to complete drain cycle.
MODEL C24EA - STEAM GENERATOR F35453 (July 2008) Page 45 of 68 C. Remove four bolts securing high voltage control box to frame. 12. Remove low voltage control box from steamer. A. Disconnect wiring harness connector leading to cooking compartment controls.
MODEL C24EA - ELECTRICAL OPERATION F35453 (July 2008) Page 46 of 68 ELECTRICAL OPERATION COMPONENT FUNCTION STEAM GENERATOR CONTROLS W a t e r L e v e l C o n t r o l ( W L C ) ............... Controls water level by monitoring conditions of the three water level probes H, L and LLCO.
MODEL C24EA - ELECTRICAL OPERATION F35453 (July 2008) Page 47 of 68 S o l e n o i d , D e l i m e V a l v e .................. Controlled by delime relay K7 and drain circuit operation. When energized by 24VAC, valve opens to allow deliming of the heat exchanger and elements during a delime cycle.
MODEL C24EA - ELECTRICAL OPERATION F35453 (July 2008) Page 48 of 68 R e l a y ( K 9 ) , C a v i t y ...................... Controlled by lower cooking compartment timer. When timer is set, relay is energized and power is provided thru K8-1/5 N.C. contacts to cavity condensate solenoid and heat exchanger relay (K11).
MODEL C24EA - ELECTRICAL OPERATION F35453 (July 2008) Page 49 of 68 COMPONENT LOCATION Steam Generator Base.
MODEL C24EA - ELECTRICAL OPERATION F35453 (July 2008) Page 50 of 68.
MODEL C24EA - ELECTRICAL OPERATION F35453 (July 2008) Page 51 of 68 Water Level Control Cooking Compartment Controls.
MODEL C24EA - ELECTRICAL OPERATION F35453 (July 2008) Page 52 of 68 SMART CYCLE POWER MANAGEMENT Reduces energy use by not powering all the heating elements in steam generator and heat exchanger when the steamer is at operating pressure and one cooking compar tment in use.
MODEL C24EA - ELECTRICAL OPERATION F35453 (July 2008) Page 53 of 68 K. Pressure switch (1PAS) closed. L. Drain valve closed and steam generator is empty. M. Delime valve closed and heat exchanger empty. 1) Delime valve end switch N.O. contacts are open.
MODEL C24EA - ELECTRICAL OPERATION F35453 (July 2008) Page 54 of 68 a) Ready lights (1LT) (green) are lit for the upper and lower compartments. b. K1-5/1 N.C. contacts open. a) LED 4 off. Regulating contactor 2 (3CON) de-energized. 2) LED 3 off. Regulating contactor 1 (2CON) de-energized.
MODEL C24EA - ELECTRICAL OPERATION F35453 (July 2008) Page 55 of 68 2) HL LED off. High level (HL) coil de-energized by ILR-2 contacts opening. a. WLC (HL) contacts open. Slow fill solenoid (4SOL) de-energized. 2. Timers reach zero (Upper & Lower Compartments).
MODEL C24EA - ELECTRICAL OPERATION F35453 (July 2008) Page 56 of 68 6. LED 13 Lit. Power to delime 1 (TDR). Time delay relay has no output from load terminal until input trigger voltage is received by delime switch (2S) at the start of a delime cycle.
MODEL C24EA - ELECTRICAL OPERATION F35453 (July 2008) Page 57 of 68 a. Delime relay (K2) remains powered. LED 15 remains lit from pressing delime switch (2S). b. Power to heating circuit, power light (3LT) (amber) and WLC thru K4-5/3 closed contacts (N.
MODEL C24EA - ELECTRICAL OPERATION F35453 (July 2008) Page 58 of 68 SCHEMATIC DIAGRAMS.
MODEL C24EA - ELECTRICAL OPERATION F35453 (July 2008) Page 59 of 68 - THIS PAGE INTENTIONALLY LEFT BLANK -.
MODEL C24EA - ELECTRICAL OPERATION F35453 (July 2008) Page 60 of 68 Steam Generator Base.
MODEL C24EA - ELECTRICAL OPERATION F35453 (July 2008) Page 61 of 68.
MODEL C24EA - ELECTRICAL OPERATION F35453 (July 2008) Page 62 of 68 WIRING DIAGRAMS Heating Element Wiring.
MODEL C24EA - ELECTRICAL OPERATION F35453 (July 2008) Page 63 of 68.
MODEL C24EA - ELECTRICAL OPERATION F35453 (July 2008) Page 64 of 68.
MODEL C24EA - ELECTRICAL OPERATION F35453 (July 2008) Page 65 of 68 Cooking Compartment.
MODEL C24EA - TROUBLESHOOTING F35453 (July 2008) Page 66 of 68 TROUBLESHOOTING Before performing any of the troubleshooting checks lis ted below, remove the front generator base panel and check the LED’S on the control board for the status of the condition or component in the operating sequence.
MODEL C24EA - TROUBLESHOOTING SYMPTOM POSSIBLE CAUSES F35453 (July 2008) Page 67 of 68 Steamer will not heat. 1. Check incoming voltage. 2. Steam generator not filled. See Symptom - Steam generator not filling or is slow to fill. 3. Power switch (1S) malfunction.
MODEL C24EA - TROUBLESHOOTING F35453 (July 2008) Printed in U.S.A. - N O T E S -.
An important point after buying a device Vulcan-Hart ML-136058 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Vulcan-Hart ML-136058 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Vulcan-Hart ML-136058 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Vulcan-Hart ML-136058 you will learn all the available features of the product, as well as information on its operation. The information that you get Vulcan-Hart ML-136058 will certainly help you make a decision on the purchase.
If you already are a holder of Vulcan-Hart ML-136058, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Vulcan-Hart ML-136058.
However, one of the most important roles played by the user manual is to help in solving problems with Vulcan-Hart ML-136058. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Vulcan-Hart ML-136058 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
