Page 2 - TABLE OF CONTENTS
VHX SERIES STEAMERS F24700 (October 2001) Page 2 of 68 TABLE OF CONTENTS GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . ...
Page 4 - GENERAL; INSTALLATION
VHX SERIES STEAMERS - GENERAL F24700 (October 2001) Page 4 of 68 GENERAL INSTALLATION Refer to the Installation and Operation Manual fordetailed installation instructions. MAINTENANCE Refer to the Installation and Operation Manual forspecific maintenance instructions. CLEANING Refer to the Installat...
Page 5 - Boiler Control Styles
VHX SERIES STEAMERS - GENERAL F24700 (October 2001) Page 5 of 68 Boiler Control Styles VHX Steamers manufactured using the old style boiler controls ended on 5/19/00. Steamers that were in stock atthe time of the boiler control changeov er were remov ed and equipped with the new style controls witho...
Page 6 - Water Supply
VHX SERIES STEAMERS - GENERAL F24700 (October 2001) Page 6 of 68 WATER CONDITIONING Furnishing the boiler with treated water to reducescale formation is important. Scale formation willreduce steam output, cause premature componentfailure, and shorten equipment life. Most watersupplies contain scale ...
Page 7 - Gas Supply; TOOLS; Standard; Special
VHX SERIES STEAMERS - GENERAL F24700 (October 2001) Page 7 of 68 Gas Supply MODEL INPUT (BTU/HR) MANIFOLD PRESSURE (INCHES W.C.) PILOT PRESSURE (INCHES W.C.) LINE PRESSURE (INCHES W.C.) NATURAL PROPANE MAXIMUM ALLOWED NAT. PROP. NAT. PROP. NAT. PROP. MINIMUM RECOMMENDED MINIMUM RECOMMENDED VHX24G 20...
Page 8 - STEAMER OPERATION; CABINET BASE BOILER; COOKING COMPARTMENT
VHX SERIES STEAMERS - OPERATION F24700 (October 2001) Page 8 of 68 STEAMER OPERATION CABINET BASE BOILER Ensure that all utility connections to the steamerhav e been made and are turned ON and that theknob on the main gas v alv e is in the ON position. The VHX Series steamers are CSD-1 compliant and...
Page 9 - BOILER BLOWDOWN AND
VHX SERIES STEAMERS - OPERATION F24700 (October 2001) Page 9 of 68 1. W ith both timer knobs at the off position, openthe compartment doors and observ e that nosteam has entered the cooking compartments,then close the doors. 2. Set both timer knobs at 2 minutes. The readylights will go off, the cook...
Page 10 - COMPONENT FUNCTION; CABINET BASE BOILER CONTROLS
VHX SERIES STEAMERS - COMPONENT FUNCTION F24700 (October 2001) Page 10 of 68 COMPONENT FUNCTION CABINET BASE BOILER CONTROLS Power Switch (ON/OFF) . . . . . . . . . W hen turned ON, supplies power to the control circuit. Reset Switch (Manual) . . . . . . . . . . Resets the low water lev el safety ci...
Page 12 - COOKING COMPARTMENT CONTROLS
VHX SERIES STEAMERS - COMPONENT FUNCTION F24700 (October 2001) Page 12 of 68 COOKING COMPARTMENT CONTROLS The upper section of the steamer consists of two separate cooking compartments. Each compartment functionsindependently with its own set of controls. Power is supplied to the controls only after...
Page 13 - REMOVAL AND REPLACEMENT OF PARTS; COMPONENT LOCATIONS; Cabinet Base Boiler Controls
VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS F24700 (October 2001) Page 13 of 68 REMOVAL AND REPLACEMENT OF PARTS COMPONENT LOCATIONS Cabinet Base Boiler Controls
Page 14 - Cabinet Base Boiler Controls Continued
VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS F24700 (October 2001) Page 14 of 68 Cabinet Base Boiler Controls Continued
Page 15 - Cooking Compartment Controls; WATER LEVEL CONTROLS; RELAY BOARD
VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS F24700 (October 2001) Page 15 of 68 Cooking Compartment Controls WATER LEVEL CONTROLS (MAIN OR AUXILIARY LLCO) WARNING: DISCONNECT THE ELECTRICALPOW ER TO THE MACHINE AT THE MAINCIRCUIT BOX. PLACE A TAG ON THE CIRCUITBOX INDICATING THE CIRCUIT I...
Page 18 - BURNER HEAD ASSEMBLY
VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS F24700 (October 2001) Page 18 of 68 BURNER HEAD ASSEMBLY WARNING: DISCONNECT THE ELECTRICALPOW ER TO THE MACHINE AT THE MAINCIRCUIT BOX. PLACE A TAG ON THE CIRCUITBOX INDICATING THE CIRCUIT IS BEINGSERVICED. WARNING: SHUT OFF THE GAS SUPPLYBEFOR...
Page 19 - HEAT EXCHANGER
VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS F24700 (October 2001) Page 19 of 68 HEAT EXCHANGER WARNING: SHUT OFF THE GAS BEFORESERVICING THE UNIT. WARNING: ALL GAS JOINTS DISTURBEDDURING SERVICING MUST BE CHECKED FORLEAKS. CHECK W ITH A SOAP AND W ATERSOLUTION (BUBBLES). DO NOT USE AN OPE...
Page 21 - Removal
VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS F24700 (October 2001) Page 21 of 68 NOTE: It may be necessary to use two clampsto draw the bottom of the heat exchanger closeenough to be clamped. Start one clamp at a 3o’clock position then install other clamp nearthe bottom. Once the bolts are...
Page 22 - Handle; Latch Assembly
VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS F24700 (October 2001) Page 22 of 68 Handle 1. Open the door. 2. Remov e screws from the top and bottom of thedoor. 3. Pull the inner door panel out from the doorhousing with the gasket plate and gasket stillattached. 4. Remov e the nuts and spac...
Page 23 - SERVICE PROCEDURES AND ADJUSTMENTS; BOILER; Inspection; Deliming
VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS F24700 (October 2001) Page 23 of 68 SERVICE PROCEDURES AND ADJUSTMENTS WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRES ELECTRICAL TEST ORMEASUREMENTS W HILE POW ER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALLTIMES. IF TEST PO...
Page 25 - Main Water Level Control
VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS F24700 (October 2001) Page 25 of 68 used, a frequent interv al should be used. Thisblowdown procedure is essential to proper operationand component life by remov ing sediment andscalants that may be lodged in the probe housing. NOTE: Boiler sho...
Page 26 - Auxiliary Low level Cut-Off Control
VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS F24700 (October 2001) Page 26 of 68 C. Verify LED’s on the water lev el controlboard, HL LED should be off, and LLCOLED should be illuminated. 3. Open the ball v alv e in the probe housingassembly (boiler left side) about half way, togradually ...
Page 27 - PRESSURE SWITCHES; Cycling
VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS F24700 (October 2001) Page 27 of 68 boiler shell, remov e and clean theAux LLCO probe. a. Replace the probe and checkresistance again. If resistance isstill present, install a new probe. b. Replace lead wire on probe andrepeat steps "2) thr...
Page 29 - BOILER BLOWDOWN/DRAIN
VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS F24700 (October 2001) Page 29 of 68 D. Check ports in v alv e body. 9. Rev erse procedure to install. BOILER BLOWDOWN/DRAIN SOLENOID VALVE The water contained in the boiler, being underpressure, should be "blown through" this v alv e an...
Page 33 - AIR PRESSURE SWITCH
VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS F24700 (October 2001) Page 33 of 68 AIR PRESSURE SWITCH ADJUSTMENT The air pressure switch senses the pressure lev elproduced by the blower for combustion. W hen thepressure is sufficient, the switch closes and suppliespower to the ignition con...
Page 34 - GAS PILOT PRESSURE
VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS F24700 (October 2001) Page 34 of 68 c. Replace the orifice, pressureswitch and connect the leadwires to the switch. Turn thepower switch ON and adjust thepressure switch again as outlinedin steps 4A and 4B. Verify thepilot gas v alv e is energi...
Page 36 - GAS MANIFOLD PRESSURE
VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS F24700 (October 2001) Page 36 of 68 GAS MANIFOLD PRESSURE ADJUSTMENT WARNING: DISCONNECT THE ELECTRICALPOW ER TO THE MACHINE AT THE MAINCIRCUIT BOX. PLACE A TAG ON THE CIRCUITBOX INDICATING THE CIRCUIT IS BEINGSERVICED. WARNING: SHUT OFF THE GA...
Page 37 - IGNITION CONTROL MODULE
VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS F24700 (October 2001) Page 37 of 68 7. Once the correct pressure has been set, turnthe gas supply and power switch OFF. Replacethe adjustment screw cap and manifoldpressure plug tap plug on the v alv e. 8. Turn the gas supply on and check for p...
Page 38 - Spark Verification Test
VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS F24700 (October 2001) Page 38 of 68 Spark Verification Test 1. Turn the power switch OFF. 2. Check to ensure that all electrical terminalconnections on the ignition control module andthe ignitor rod are clean and tight. If the ignitioncable app...
Page 39 - Door Sealing Adjustment
VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS F24700 (October 2001) Page 39 of 68 COOKING COMPARTMENT NOTE: For access to compartment controls,remov e the right side compartment panel. Intake Shut-Off Valve Adjustment (Steam Flow) 1. W ith the right side compartment panelremov ed, open the...
Page 40 - Door Latch Adjustment
VHX SERIES STEAMER - ELECTRICAL OPERATION F24700 (October 2001) Page 40 of 68 Door Latch Adjustment Should the cooker door jam and can not be opened,DO NOT FORCE OR PRY the door as damage willoccur. First, try lifting up on the bottom of the door at thehandle end to disengage the latch. If that does...
Page 41 - ELECTRICAL OPERATION
VHX SERIES STEAMER - ELECTRICAL OPERATION F24700 (October 2001) Page 41 of 68 ELECTRICAL OPERATION WATER LEVEL CONTROLS Low Level Cut-Off & Differential Control The steamer is equipped with three water lev elsensing probes (high, low and low lev el cut-off) anda single water lev el control board...
Page 42 - Auxiliary Low Level Cut-Off
VHX SERIES STEAMER - ELECTRICAL OPERATION F24700 (October 2001) Page 42 of 68 Auxiliary Low Level Cut-Off This control serv es as a safety backup to the mainwater lev el control (W LC) board to meet CSD-1code requirements. The operation of the auxiliarycontrol is identical to the low lev el cut-off ...
Page 43 - Board Layout and LED Legend
VHX SERIES STEAMER - ELECTRICAL OPERATION F24700 (October 2001) Page 43 of 68 RELAY BOARD Board Layout and LED Legend The relay board Prov ides a centralized location for wire harness connections and power transfer through boardrelays (K1-K7) to the other steamer controls. Also, prov ides a conditio...
Page 46 - SEQUENCE OF OPERATION; Initial Fill and Preheat
VHX SERIES STEAMER - ELECTRICAL OPERATION F24700 (October 2001) Page 46 of 68 SEQUENCE OF OPERATION NEW STYLE CONTROLS - BOILER This sequence of operation is written for boilerbases with the new style boiler controls. See"BOILER CONTROL STYLES" under "GENERAL".Refer to schematic diag...
Page 50 - Boiler Blowdown/Drain
VHX SERIES STEAMER - ELECTRICAL OPERATION F24700 (October 2001) Page 50 of 68 upper and lower set point limits. Thecycling pressure switch continues toenergize and de-energize the heatingcircuit to cycle the burner ON and OFF. This sequence continues until one of thefollowing occurs: 1) Power switch...
Page 52 - SCHEMATICS
VHX SERIES STEAMER - ELECTRICAL OPERATION F24700 (October 2001) Page 52 of 68 SCHEMATICS Models Built After 5/25/00 (New Style Boiler Controls)
Page 56 - WIRING DIAGRAMS
VHX SERIES STEAMER - ELECTRICAL OPERATION F24700 (October 2001) Page 56 of 68 WIRING DIAGRAMS Models Built After 5/25/00 (New Style Boiler Controls)
Page 61 - TROUBLESHOOTING; BOILER BASE CONTROLS; SYMPTOM
VHX SERIES STEAMER - TROUBLESHOOTING F24700 (October 2001) Page 61 of 68 TROUBLESHOOTING BOILER BASE CONTROLS WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TESTS ORMEASUREMENTS W HILE POW ER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALLTIMES. IF TEST POINTS ARE NOT EASI...
Page 68 - CONDENSED SPARE PARTS LIST; NEW STYLE CONTROLS ONLY; PART NUMBER
VHX SERIES STEAMER - CONDENSED SPARE PARTS LIST F24700 (October 2001) Printed in U.S.A. CONDENSED SPARE PARTS LIST NEW STYLE CONTROLS ONLY VHX24G, VHX24G5, MHB24G PART NUMBER DESCRIPTION NOTES 853582-1 Igniter, Sensor 850778-1 Switch, Air Pressure 850735-1 Blower, Combustion 354344-4 Valv e, Pilot G...
