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SERVICE MANUAL
VHX BOILER BASE SERIES
HIGH EFFICIENCY
ELECTRIC STEAMER
VHX24E ML-126852
VHX24E5 ML-126853
MHB24E ML-126857 (BASE ONLY)
VHX24E SHOWN
- 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.
This manual is not intended to be all encompassing. If you have not
att
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VHX SERIES STEAMERS TABLE OF CONTENTS GENERAL ................................................................................ 4 Installation, Operation and Cleaning ........................................................ 4 Introduction ............................................................................ 4 Steam Cooking ..................................................................... 4 Model Designations ................................................................. 4 Compartmen
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VHX SERIES STEAMERS ELECTRICAL OPERATION .................................................................. 24 Component Function ................................................................... 24 Cabinet Base Boiler Controls ......................................................... 24 Cooking Compartment Controls ....................................................... 25 Component Locations ................................................................... 26 Boiler Base Controls .........
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VHX SERIES STEAMERS - GENERAL GENERAL Cooking Compartments Control Panel INSTALLATION, OPERATION AND CLEANING Refer to the Installation and Operation Manual for specific instructions. INTRODUCTION Steam Cooking Convection cooking in pressure-less steaming compartments will steam cook fresh foods or will steam defrost and cook frozen foods providing the maximum color, flavor and nutritional value with the least expenditure of energy and labor. The pressure- less steaming compartments on the VHX s
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VHX SERIES STEAMERS - GENERAL The desired water properties can best be achieved Boiler Code Descriptions by using a properly maintained water treatment Vulcan-Hart incorporates redundant controls in system. compliance with the CSD-1 controls and safety devices for boiler construction on the high efficiency The water level probes in the boiler use ions in the steamer models. A description of the code is listed water to detect the water level. Do not use fully below. demineralized or de-ionized wa
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VHX SERIES STEAMERS - COMPONENT FUNCTION Electrical AMPERAGE TOTAL MODELS 1 PHASE 3 PHASE KW 208V 240V 208V 240V 480V 24 116 100 67 58 29 VHX24E, 36 --- --- 100 87 44 VHX24E5, 42 --- --- 117 --- --- MHB24E 48 --- --- --- 116 58 NOTES: 1. Amperage values in the table are nominal. Tolerance is +5/-10%. 2. Voltage values are @ 60HZ. 3. 24KW 3 phase is standard for both models. If a 24KW single phase connection is needed, the machine is
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VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS REMOVAL AND REPLACEMENT OF PARTS PRESSURE SWITCH CONTROL BOX COMPONENTS WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW LOCKOUT / TAGOUT PROCEDURES. CAUTION: Certain components in this system are subject to damage by electrostatic discharge during field repairs. A field service grounding kit is available to prevent damage. The field service grounding kit must be used anytime a control board is handled. 1. Open the cabinet
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VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS MAIN CONTROL BOX COMPONENTS WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW LOCKOUT / TAGOUT PROCEDURES. CAUTION: Certain components in this system are subject to damage by electrostatic discharge during field repairs. A field service grounding kit is available to prevent damage. The field service grounding kit must be used anytime a control board is handled. 1. Open the cabinet base door. 2. Remove heating element cover t
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VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS WATER LEVEL GAUGE ASSEMBLY WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW LOCKOUT / TAGOUT PROCEDURES. 1. Remove right side panel. NOTE: If right side panel is not accessible, open the cabinet door and remove control panel to access from front. 2. Loosen packing nuts on glass tube until threads disengage then slide nut toward center of tube. 4. To remove: A. Contactors. 1) Release catch at the base of contactor and remov
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VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS B. Insert one end of glass tube into top gauge fitting then align opposite end of tube with bottom gauge fitting. C. Lower the glass tube into bottom gauge fitting then center the tube between top & bottom gauge fittings. D. Hold glass tube in place and hand tighten the bottom packing nut then top. E. Tighten each packing nut and additional 1/2 turn. CAUTION: Do not over tighten packing nuts or damage to glass tube may occur. 6. Re-connect
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VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS 6. Loosen both conduit locking nuts (1 1/2" & 3/8") HEATING ELEMENT MOUNTING in main control box. PLATE 7. Loosen conduit nut (1 1/2") on elbow connected to main control box. WARNING: DISCONNECT THE 8. Remove mounting bolts for main control box. ELECTRICAL POWER TO THE MACHINE AND FOLLOW LOCKOUT / A. Lift main control box to remove from the TAGOUT PROCEDURES. frame and position it to the left side. 9. Remove heating element mounting plate.
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VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS C. Position heating element mounting plate with mounting studs for the element cover at the top. NOTE: When installing heating element mounting plate, install and tighten the mounting bolts as indicated to ensure the mounting plate is flush with boiler flange and gasket is evenly compressed. If bolt is not threading properly by hand, clean out the threads with a 3/8 x 16 tap. D. Align mounting holes then press and hold heating element mount
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VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS LEFT SIDE VIEW SHOWN 18. Separate union at boiler drain. LEFT SIDE VIEW SHOWN 19. On models with cooking compartments: 23. Remove main control box and pressure switch control box from boiler base. A. Remove the left and right access panels between the cooking compartments and 24. Remove bolts securing boiler to base frame boiler base. then slide boiler forward to remove. B. Disconnect flexible steam supply line from 25. Remove all plumbing c
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VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS 5. Adjust the door as outlined in DOOR SEALING ADJUSTMENT under COOKING COMPARTMENT. NOTE: Do not over tighten gasket plate screws as this will compress the gasket excessively and interfere with proper door sealing. NOTE: Damage to the gasket sealing surface, such as nicks or cuts, will cause steam leakage. 3. To install: A. On the two replacement descalers, stretch the coiled wire (cathode) at the top to elongate the wire then form an open
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VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS 3. Pull the inner door panel out from the door housing with the gasket plate and gasket still attached. 4. Remove the screws from the side edge of the door that secure the latch mechanism and remove the latch from the door. 4. Remove the nuts and spacers from the handle NOTE: When installing, the latch lever must rest on screws and remove the handle from the door. top of the handle latch screw. 5. Reverse procedure to install. NOTE: When ins
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VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS SERVICE PROCEDURES AND ADJUSTMENTS WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRES ELECTRICAL TEST OR MEASUREMENTS WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. IF TEST POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT POWER AND FOLLOW LOCKOUT / TAGOUT PROCEDURES, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST. 8. Install descalers (cathodic protectors). BOILER 9. Install heating element mounting plate. Insp
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VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS 1. Access the descalers (cathodic protectors) as WATER LEVEL CONTROLS outlined in REMOVAL AND REPLACEMENT TEST OF PARTS. 2. Inspect the two descalers hanging in boiler. A build-up of lime scale on or near the water level sensing probes may cause them to retain moisture NOTE: As descalers erode over time, the diameter on the probe surface and can give a false reading. decreases while the length increases. Also, a cracked or damaged insulato
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VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS 1) Verify wire color connections are A. Turn power switch on and allow boiler to correct at probe numbers 50, 51 & 52, fill. Do not press the reset switch to start and at the water level control board. heating. 2) Turn power switch off. B. Turn water supply off and open the ball valve on probe housing assembly. This will 3) Remove probe assembly, clean lime allow boiler water to drain. scale build-up from the probes and compare probe lengt
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VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS B. Verify Low Water light is lit (front control 3. Press reset switch and verify high pressure light panel). turns off. C. Verify 120VAC is on Aux LLCO COM, and 4. When green ready light comes on, press reset 0 volt is on Aux LLCO N.O. contacts. switch to begin heating (low water light turns off). 9. When water level reaches Aux LLCO probe as boiler continues to fill: A. Allow boiler to fully pressurize. Cycling pressure switch opens and he
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VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS NOTE: For every click of the adjustment wheel, HIGH LIMIT PRESSURE the pressure setting is changed approximately SWITCH ADJUSTMENT 1/8 PSI. NOTE: Make the adjustment in small NOTE: Before the high limit pressure switch can be increments. adjusted, the cycling pressure switch must be temporarily removed from the boiler control circuit. 7. After adjusting high limit pressure switch, the This allows the boiler to pressurize above the normal bo
