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SERVICE MANUAL
VHX BOILER BASE SERIES
HIGH EFFICIENCY GAS
STEAMERS
VHX24G ML-114795
VHX24G5 ML-126590
MHB24G ML-114954 (BASE ONLY)
VHX24G 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 attende
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VHX SERIES STEAMERS TABLE OF CONTENTS GENERAL ............................................................................. 4 Installation ......................................................................... 4 Maintenance ....................................................................... 4 Cleaning .......................................................................... 4 Introduction ........................................................................ 4 Steam Cooking ...........
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VHX SERIES STEAMERS Air Pressure Switch Adjustment ........................................................ 33 Gas Pilot Pressure Adjustment......................................................... 34 Gas Manifold Pressure Adjustment ..................................................... 36 Ignition Control Module Checks ........................................................ 37 Cooking Compartment ............................................................... 39 Intake Shut-Off Valve Adjustmen
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VHX SERIES STEAMERS - GENERAL GENERAL Model Designations INSTALLATION Refer to the Installation and Operation Manual for detailed installation instructions. MAINTENANCE Refer to the Installation and Operation Manual for specific maintenance instructions. CLEANING Refer to the Installation and Operation Manual for specific cleaning instructions. INTRODUCTION Boiler Code Descriptions Vulcan-Hart incorporates redundant controls in Steam Cooking compliance with the CSD-1 controls and safety devices
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VHX SERIES STEAMERS - GENERAL Boiler Control Styles VHX Steamers manufactured using the old style boiler controls ended on 5/19/00. Steamers that were in stock at the time of the boiler control changeover were removed and equipped with the new style controls without recording the serial number for tracking. Refer to the pictures below to differentiate between the old style and new style boiler controls. Page 5 of 68 F24700 (October 2001)
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VHX SERIES STEAMERS - GENERAL WATER CONDITIONING SPECIFICATIONS Furnishing the boiler with treated water to reduce Water Supply scale formation is important. Scale formation will The fact that a water supply is potable is no reduce steam output, cause premature component guarantee that it is suitable for steam generation. failure, and shorten equipment life. Most water The supply connection to the steam generator supplies contain scale producing minerals such as should be “treated” water and mus
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VHX SERIES STEAMERS - GENERAL Gas Supply LINE PRESSURE MANIFOLD PILOT INPUT (INCHES W.C.) PRESSURE PRESSURE (BTU/HR) (INCHES W.C.) (INCHES W.C.) MODEL NATURAL PROPANE MAXIMUM MINIMUM MINIMUM ALLOWED NAT. PROP. NAT. PROP. NAT. PROP. RECOMMENDED RECOMMENDED 200,000 200,000 3.0 3.0 3.5 3.5 7.0 11.0 VHX24G 270,000 270,000 3.0 3.0 3.5 3.5 7.0 11.0 200,000 200,000 3.0 3.0 3.5 3.5 7.0 11.0 VHX24G5 14.0 270,000 270,000 3.0 3.0 3.5 3.5 7.0 11.0 200,000 200,000 3.0 3.0 3.5 3.5 7.0 11.0 MHB24G 270,000
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VHX SERIES STEAMERS - OPERATION STEAMER OPERATION 2) If pilot burner flame is not CABINET BASE BOILER established immediately, sparking will continue for 90 seconds. After that duration, the ignition control module Ensure that all utility connections to the steamer will lock out and needs to be reset to have been made and are turned ON and that the start the pilot and main burner lighting knob on the main gas valve is in the ON position. cycle again. The VHX Series steamers are CSD-1 complian
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VHX SERIES STEAMERS - OPERATION 1. With both timer knobs at the off position, open BOILER BLOWDOWN AND the compartment doors and observe that no STEAMER SHUT OFF steam has entered the cooking compartments, then close the doors. 2. Set both timer knobs at 2 minutes. The ready Turn the steamer off at least once daily to blowdown lights will go off, the cooking lights will come the boiler. This will aid in the removal of sediment on, and steam will begin to enter the and scale build-up in the boile
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VHX SERIES STEAMERS - COMPONENT FUNCTION COMPONENT FUNCTION CABINET BASE BOILER CONTROLS Power Switch (ON/OFF) ......... When turned ON, supplies power to the control circuit. Reset Switch (Manual) .......... Resets the low water level safety circuit on initial startup or the occurrence of a low water condition and allows the boiler to fill with water. Also, resets the high pressure level safety circuit on initial startup or the occurrence of a high pressure condition and allows the gas ignition
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VHX SERIES STEAMERS - COMPONENT FUNCTION Relay Board ................... Provides a centralized location for wire harness connections and power transfer through board relays (K1-K7) to the steamer controls. Also, provides a condition or component troubleshooting indicator by utilizing seventeen LED’S on the board to represent the status of the condition or component in the operation sequence. For an LED legend, see "RELAY BOARD" under "ELECTRICAL OPERATION". New style controls only. NOTE: The re
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VHX SERIES STEAMERS - COMPONENT FUNCTION COOKING COMPARTMENT CONTROLS 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 pressure rises above the compartment pressure switch setting to close the N.O. contacts. Ready Light (Green) ............ When lit, indicates steamer is ready to cook. Cooking Light (Red) ............ When lit, indicates ste
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VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS REMOVAL AND REPLACEMENT OF PARTS COMPONENT LOCATIONS Cabinet Base Boiler Controls Page 13 of 68 F24700 (October 2001)
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VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS Cabinet Base Boiler Controls Continued F24700 (October 2001) Page 14 of 68
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VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS Cooking Compartment Controls WATER LEVEL CONTROLS RELAY BOARD (MAIN OR AUXILIARY LLCO) WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN WARNING: DISCONNECT THE ELECTRICAL CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT POWER TO THE MACHINE AT THE MAIN BOX INDICATING THE CIRCUIT IS BEING CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT SERVICED. BOX INDICATING THE CIRCUIT IS BEING SERVICED. 1. Open the cabinet base door. 1. Open the cabinet
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VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS 1) Remove the mounting screws on the WATER LEVEL GAUGE back side of the control box and lift ASSEMBLY out the pressure switch. Proceed to step 5. B. High limit control - disconnect the lead WARNING: DISCONNECT THE ELECTRICAL wires. POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT 5. Disconnect the pressure fittings at the bottom BOX INDICATING THE CIRCUIT IS BEING of the switch. SERVICED. 6. Preset the new pressure sw
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VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS a. From the bottom right side, raise WARNING: ALL GAS JOINTS DISTURBED the boiler two to three inches so DURING SERVICING MUST BE CHECKED FOR it tilts to the left. When the LEAKS. CHECK WITH A SOAP AND WATER remaining water has drained out, SOLUTION (BUBBLES). DO NOT USE AN OPEN lower the boiler before. FLAME. proceeding. NOTE: Gas combination control valves are not B. Remove the drain/scale clean-out plug serviceable and should not be disa
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VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS BURNER HEAD ASSEMBLY WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED. WARNING: SHUT OFF THE GAS SUPPLY BEFORE SERVICING THE UNIT. 1. Remove the pressure gauge tubing and power cable from the rear of the control panel then remove the panel. 2. Disconnect the spark ignition cable from the ignitor terminal. 3. Disconnect pilot gas tubing fro
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VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS NOTE : Removal of the gas valve piping assembly HEAT EXCHANGER assumes the use of a gas line quick connect or union at the gas supply inlet to the steamer. WARNING: SHUT OFF THE GAS BEFORE 8. Remove the four nuts from combustion blower SERVICING THE UNIT. mounting flange and remove blower from burner tube assembly. WARNING: ALL GAS JOINTS DISTURBED DURING SERVICING MUST BE CHECKED FOR LEAKS. CHECK WITH A SOAP AND WATER SOLUTION (BUBBLES). D
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VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS 12. For clearance of the heat exchanger only, 13. To install heat exchanger: remove the drain nut (petcock) and the lower adjustment knob from the water level gauge. A. Clean the mating surfaces on the heat exchanger and boiler. A. Remove the remaining bolts on the heat exchanger then pull heat exchanger B. Install a new gasket on the boiler side of straight out from the boiler. the mounting flange. C. Insert the heat exchanger back into the
