Vulcan-Hart STEAMER C24EO3 User's Manual
Contents
1. 25386 June 2010 24 SERIES STEAMER ELECTRICAL OPERATION C24EO5 208V 240V TO CONTROL 3 PHASE 208V TRANSFORMER 5 PHASE 240V LIMITING CONTACTOR HEATING ELEMENTS TO CONTROL m 1 PHASE 208V TRANSFORMER 1 PHASE 240V HEATING ELEMENTS PRIMARY TAPS OF CONTROL TRANSFORMER MUST BE CONNECTED ACCORDING TO THE APPLIANCE DATA PLATE VOLTAGE MARKING AND ACTUAL CONNECTED SUPPLY DERIVED FROM 857591 1 Rev B F25386 June 2010 22 of 24 24 SERIES STEAMER ELECTRICAL OPERATION C24E05 480V TO CONTROL TRANSFORMER 3 PHASE 480V HEATING ELEMENTS REGULATING CONTACTOR PRIMARY TAPS OF CONTROL TRANSFORMER MUST BE CONNECTED ACCORDING TO THE APPLIANCE DATA PLATE VOLTAGE MARKING AND ACTUAL CONNECTED SUPPLY 24 5 X Y bac o 1CON 11 1 M Nd L2 T2 PSS 2CON T2 L2 13 13 2 0 71 11 1CON L3 T3 Z 857591 2 Rev B Page 23 of 24 F25386 June 2010 24 SERIES STEAMER TROUBLESHOOTING TROUBLESHOOTING SYMPTOM Compartment leaks water around door POSSIBLE CAUSES Steamer not level Steamer overfilled Steam leaks around door Worn gasket Damaged gasket Steam vent pipe blocked Door not adjusted Steamer will not heat cook light off low water light off Line voltage incorrect or transformer malfunct2. 41 Manual Drain Valve 1 4 2 4 00 2 Bor DEDE EP ENERO EDI SERVICE PROCEDURES AND ADJUSTMENTS Door Eatch Adjustment cot Ter kx ace il RR X eR RE RU RO RR Ea UR s RR Ria Bid Heating Element 1 1 9 Temperature Control Calibration 5 4 ELECTRICAL OPERATION Component FUNCION i us Saad ka ke Peal eds ERE PAR Palma VERE Gomponent Location ael es TERI eee Degas YARD sequence of Operation ERR T IDEEN PR MI NM EE Schematic Diagram lt 3 iz urs Mattia ura leer sib PA NIHU her PERDE RU fen Wiring Diagrams Heating Elements TROUBLESHOOTING 25 t RII UR REP ters MERE ED I ERIS EE ENEMIES REESE Vulcan 2010 F25386 June 2010 Page 2 of 24 24 SERIES STEAMERS GENERAL GENERAL INSTALLATION OPERATION AND CLEANING Refer to the Installation amp Operation Manual for specific instructions INTRODUCTION Features
3. SERVICE MANUAL C24EO SERIES ELECTRIC COUNTERTOP STEAMERS MODEL ML C24EO3 136006 C24EO5 136007 C24E05 SHOWN This Manual is prepared for the use of trained Vulcan Service Technicians and should not be used by those not properly qualified This manual is not intended to be all encompassing If you have not attended a Vulcan Service School for this product you should read in its entirety the repair procedure you wish to perform to determine if you have the necessary tools instruments and skills requiredto perform the procedure Procedures for which you do not have the necessary tools instruments and skills should be performed by a trained Vulcan Service Technician The reproduction transfer sale or other use of this Manual without the express written consent of Vulcan is prohibited This manual has been provided to you by ITW Food Equipment Group LLC ITW FEG without charge and remains the property of ITW FEG and by accepting this manual you agree that you will return it to ITW FEG promptly upon its request for such return at any time in the future For additional information on Vulcan Hart or to locate an authorized parts and service provider in your area visit our website at www vulcanequipment com A product of VULCAN HART BALTIMORE MD 21222 F25386 June 2010 24 SERIES STEAMERS TABLE OF CONTENTS GENERAL ero a tee RE ade Rte oe To
4. e Requires no water or drain line connections manual fill amp manual drain e Castaluminum element block for efficient heat transfer and distribution e Field convertible to single phase or three phase power depending on the supply available e 3 0gallons maximum holding pan capacity Steam Cooking The C24EO series steamer provides timed or continuous mode cooking in a pressure less compartment The small physical size of the steamer offers an efficient way to produce many foods in small batches Pressure less convection steam cooking 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 cooking compartment allows the operator to open and close the door anytime during a cooking cycle Model Designations e 24 3 pan capacity e C24EO5 5 pan capacity based on 2 5 inch pan depth Exterior Dimensions e 24 24 w x 33 d x 19 5 h e C24EO5 24 w x 33 d x 26 h Page 3 of 24 SPECIFICATIONS Water Requirements A potable water supply does not guarantee that it s suitable for steam generation The water supply must be within the following specifications or a local water treatment specialist may need to be consulted If a water treatment system is installed it must be properly maintained e Hardness Less than 3 grains e Silica e Total Chloride
5. Additional time can be set or the cook timer can be turned off throughout the cooking cycle If turned to off steamer reverts to hold temperature B Cook light red comes on C Temperature controller energized and evaluates input from thermocouple 1 If temperature is below set point temperature controller internal N O contacts close and energize regulating contactor 2CON coil thru K1 2 N C contacts a Line voltage is supplied to other side of heating elements Elements heat Temperature reaches set point and the temperature control s internal contacts open A Regulating contactor 2CON coil de energized and power is removed from heating elements Steamer cycles on the temperature control until cook time expires Time expires on cook timer A Timer contacts 11 amp 13 open timer motor is de energized and timing stops B Timer contacts 11 amp 14 close 1 Buzzer energized thru K2 N O contacts and sounds NOTE The buzzer continues to sound until timer dial is set to off position or additional time is set C Timer contacts 21 amp 23 open cook light SLT red goes out and temperature controller is de energized 24 SERIES STEAMER ELECTRICAL OPERATION Turn cook timer off A Timer contacts 11 amp 14 open buzzer is de energized B Steamer reverts to hold temperature and continues to cycle until a cook time is dialed on timer power switch is turned to
6. Primer N and Loctite 242 to threads of screws before assembling 9 Install screws to secure door halves together 10 Check opening and closing operation of door Latch Assembly Removal and Disassembly 1 Separate outer door housing assembly from inner door panel as outlined under DOOR HANDLE REMOVAL 2 Remove screws securing latch assembly to inner door panel and remove latch mechanism LATCH MECHANISM SCREWS 10616 3 Remove E clip from latch assembly pins and pull pins from latch mechanism Pali gt gt lt J STATIONARY BRACKET 4 Remove retaining pin from spring pin 5 Separate sliding bracket from stationary bracket SLIDING BRACKET STATIONARY BRACKET F25386 June 2010 24 SERIES STEAMERS REMOVAL AND REPLACEMENT OF PARTS Assembly 1 Apply Lubriplate 630AA to sides of sliding bracket 2 Insert spring pin into bottom of sliding bracket A Place spring over spring pin 3 Assemble sliding bracket into stationary bracket While holding head of spring pin against bottom of sliding bracket insert spring pin into keeper hole in bottom of stationary bracket SPRING PIN Tree i app LUBRICATE SLIDING BRACKET d 9 Oe 2 y KEEPER HOLE FOR SPRING PIN A Secure spring pin in place with retaining pin NOTE Install pins such that heads of pins will be facing inward toward hinge side of inner door panel when latch a
7. control adjustment display will blink on off When display reverts to a steady image that displayed temperature set point has been locked in to memory eg TEMPERATURE DISPLAY FOR REFERENCE ONLY RANGE 190 215 F 22382 F25386 June 2010 24 SERIES STEAMER ELECTRICAL OPERATION ELECTRICAL OPERATION COMPONENT FUNCTION Heating Element Fuses 1FU amp 2FU Low Water Light 1LT On Light 2LT Light 3LT Relay K1 Relay Kij d eee Relay K3 Power Switch 1S Door Switch 1SW High Limit Thermostat 1TAS Low Water Thermostat 2TAS Hold Thermostat 3TAS Timer Temperature Control Temperature Probe Transformer 1T F25386 June 2010 Creates audible signal when timed cook cycle is complete and when a low water condition exists Supplies line voltage to heating element assembly Energized whenever Power Switch 1S is on and High Limit Thermostat 1TAS and Low Water Thermostat 2TAS are closed Supplies line voltage to heating element assembly Energi
8. 377 F25386 June 2010 P v 8 of 24 24 SERIES STEAMERS REMOVAL AND REPLACEMENT OF PARTS 5 Partially remove heating element assembly by pulling assembly towards you 6 Remove high limit thermostat bulb and bracket 7 Remove heating element assembly Installation NOTE When replacing element assembly for 3 pan unit with 240V supply disconnect and insulate element leads with orange green and red markers three 664W elements not used 1 Completely and evenly coat heating element assembly with thermal transfer compound using notched trowel Use one 13 5 oz tube of thermal transfer compound Partially install heating element assembly then mount high limit thermostat bulb and bracket to assembly A Apply thermal transfer compound between high limit bulb and heating element assembly Install heating element assembly Push element assembly towards front of machine Connect lead wires to 1CON and 2CON in noted positions Check steamer for proper operation MANUAL DRAIN VALVE CR gt WARNING Disconnect the electrical power to the machine and SSC AS follow lockout tagout procedures D 1 Remove right SIDE PANEL and REAR PANEL 2 Remove pin and washer to disconnect the handle linkage from linkage bracket MANUAL DRAIN Remove drain valve Reassemble parts removed in reverse order of removal A Apply pipe thread se
9. 75 F 5 F J Drain valve is closed drain lever pushed in Press momentary start switch 15 A Limiting contactor 1CON coil energized thru high limit thermostat 1TAS 1 Line voltage is supplied to one side of heating elements B Relay K2 coil energized thru low water thermostat 2TAS 1 K2 1 contacts close a Power switch circuit is latched 2 K2 2N C contacts open a Low water light 1LT and buzzer are de energized C ON indicator light 2LT amber comes on D Relay K1 coil energized thru door switch and hold thermostat 3TAS 1 K1 3 contacts close and regulating contactor 2CON coil is energized a Line voltage is supplied to other side of heating elements Elements heat 2 K1 2N C contacts open 3 1 1 contacts open prevents timer from being energized during pre heat 3 4 Steamer reaches 175 F A Hold thermostat opens and relay K1 coil is de energized 1 1 3 contacts close and remove line voltage to heating element assembly 2 1 and K1 2 contacts return to close condition NOTE Steamer will maintain hold temperature until a cook time is dialed on timer door is opened or power switch is turned off Set cook timer to desired time NOTE Timer motor will not run when hold thermostat 3TAS is below 175 F Page 18 of 24 A Timer contacts close timer motor is energized and timing down begins NOTE
10. MERS REMOVAL AND REPLACEMENT OF PARTS C Install thermostat hand tight Do not over 1 Remove right SIDE PANEL tighten 2 Remove screw and heat shield TEMPERATURE PROBE SHIELD A Wi LA RI WARNING Disconnect the electrical power to the machine and follow lockout tagout procedures 1 Remove right SIDE PANEL and REAR PANEL 2 Disconnect probe leads from the temperature control TEMPERATURE m PROBE SCREW 22372 3 3 Remove bolts NOTE Support heating element assembly while removing last bolt 3 Remove temperature probe from steam vent pipe 4 Reverse procedure to install replacement probe and check steamer for proper operation 5 Adjust temperature control as outlined under TEMPERATURE CONTROL CALIBRATION in SERVICE PROCEDURES AND 4 Disconnect heating element leads from 1CON ADJUSTMENTS and 2CON noting their locations HEATING ELEMENT ASSEMBLY oO 42AF35AF WE RA Disconnect the Se electrical power to the machine and follow lockout tagout procedures amp 2 Removal The heating element assembly contains elements molded into a cast aluminum block The block is mounted on the underside of cooking compartment Heating element assembly sits on springs which compress to hold assembly tight to bottom surface of steam chamber but allow for thermal expansion and contraction gt REMOVE ALL LEADS 27722
11. Once proper slot alignment has been set hold striker close to its base then tighten the striker nut Be careful not to damage striker slot when tightening or door may not latch properly NOTE Do not over tighten nut If over tightened striker may turn and change alignment NOTE If door does not open easily add shims between striker and cabinet front When adding shims make certain that door gasket seals properly and steamer does not leak Remove shims as necessary until leaking stops C Remove nut from striker and this should release it from the panel Page 13 of 24 25386 June 2010 24 SERIES STEAMER SERVICE PROCEDURES AND ADJUSTMENTS HEATING ELEMENT TEST 3 Check for proper operation WATTS AMPS PER OHMS PER The heating element assembly contains elements MODEL VOLTS PER ELEMENT ELEMENT molded into a cast aluminum block 3 pan units have ELEMENT LEAD 6 elements and 5 pan units have 3 elements See wiring diagrams 2003 9 6 21 6 1 Turn cooking mode switch to constant C24EO3 664 32 652 2 Measure voltage at heating element terminals on 2667 11 1 21 6 1 and verify it against data plate 208 4000 19 2 10 8 24 4 16 7 14 4 NOTE For 480V units element voltage is 277V C24EO5 009 i A f voltage is incorrect find the source of the 188 200 159 192 problem 1 Values in the table are nominal Tolerance is 5 10 B If voltage is correc
12. actory to sea level The elevation is used in conjunction with the elevation table below to determine the correct set point temperature for the control NOTE If the set point temperature is too high the excess boiling action will cause water droplets to exit the steam vent pipe and cause high water usage 1 Remove right SIDE PANEL as outlined in REMOVAL AND REPLACEMENT OF PARTS 2 Place thermocouple approximately one inch down in the center of steam vent pipe 3 Turn steamer on by selecting constant mode Allow steamer temperature to stabilize by completing two heating cycles 5 Record the temperature reading when cook light goes out 6 Using the elevation table compare the recorded temperature to the temperature listed for the specific elevation NOTE Use temperature scale on control dial plate for reference only The scale represents dial turns in 1 F increments not the actual temperature When calibrating use the recorded temperature taken from thermocouple ELEVATION FT TEMPERATURE F Sea Level 1 000 2 000 3 000 4 000 5 000 6 000 7 000 8 000 A Ifthe set point temperature of the control is correct no adjustment is necessary B If the set point temperature of the control is not correct adjust the temperature control Page 15 of 24 1 Turn the temperature control dial clockwise to increase temperature or counterclockwise to decrease temperature NOTE During temperature
13. alant to plumbing threads before assembly 6 Check steamer for leaks and proper operation Page 9 of 24 F25386 June 2010 24 SERIES STEAMERS REMOVAL AND REPLACEMENT OF PARTS DOOR T Disconnect the gt S electrical power to the machine and Et follow lockout tagout procedures Removal 1 Close door 2 Remove left SIDE PANEL 3 Remove nuts from upper hinge located inside front panel UPPER HINGE fi j 1 BI W 10621 4 door slightly and while holding door pull upper hinge away from front panel 5 Pull upper hinge out of upper door hinge bushing Lift door assembly up and off lower door hinge Reinstall parts removed in reverse order of removal 8 Check door for fit and proper sealing of gasket Gasket 1 Open door 2 Remove the shoulder screws and pan pusher bracket from gasket plate GASKET PLATE PAN PUSHER BRACKET F25386 June 2010 3 Remove gasket plate 4 Remove gasket from inner door panel 5 Remove RTV from bottom part of inner door panel Apply new RTV 109 to bottom of door where shown when assembling gasket to door 10612 6 Place a small amount of RTV109 into the inner door panel gasket screw holes before assembly 7 Position the new gasket on gasket plate and reverse procedure to install Handle Removal 1 Open door 2 Remove s
14. arts removed in reverse order 11 Check door for fit and proper door gasket sealing Page 12 of 24 24 SERIES STEAMER SERVICE PROCEDURES AND ADJUSTMENTS SERVICE PROCEDURES AND ADJUSTMENTS Certain procedures in this section require 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 _ DOOR LATCH ADJUSTMENT D Open door DOORLATCHADJUSTMENT _ Remove striker Opening a Jammed Door Remove any burrs on striker that may cause Should the steamer door jam and cannot be latch to stick opened DO NOT FORCE OR PRY the door as damage will occur Apply Loctite 271 to threads of striker Reinstall striker with slotted side up Snug striker ON POTOM gnato nut Perform Adjustment so door will not jam disengage latch A If door does not open remove right SIDE Adjustment PANEL 1 Reinstall striker with slot pointing upward and B Locate the striker that catches on door latch hand tighten nut only near steam chamber on front panel 2 Close door to center striker in front panel mounting hole 3 Open door and check striker slot for horizontal alignment The slot on striker must be kept horizontal in order for door latch to catch properly and latch 4
15. ck steamer for proper operation Page 6 of 24 24 SERIES STEAMERS REMOVAL AND REPLACEMENT OF PARTS HIGH LIMIT THERMOSTAT aw x LA WARNING Disconnect the e electrical power to the machine and WS SS s S follow lockout tagout procedures Do not sharply bend and or clamp down on the capillary tube or damage may occur 1 Remove right SIDE PANEL 2 Disconnect lead wires from high limit ae 3 Remove thermostat from mounting bracket 4 Remove screw and heat shield to access capillary bulb SCREW 22372 5 Loosen screws securing capillary bulb Page 7 of 24 4 22371 SCREWS Remove high limit thermostat Reverse procedure to install and check steamer for proper operation A Apply a small amount of thermal transfer compound between capillary bulb and heating element assembly NOTE Do not clamp bulb with excessive force LOW WATER THERMOSTAT A Disconnect the 7 electrical power to the machine and S Q e SY follow lockout tagout procedures 1 Remove right SIDE PANEL and REAR PANEL 2 Disconnect lead wires LOW WATER TH 8122375 Remove low water thermostat Reverse procedure to install and check steamer for proper operation A Apply small amount of thermal transfer compound to tip of thermostat B Apply Loctite 242 to threads of thermostat F25386 June 2010 24 SERIES STEA
16. crews from top and bottom of door assembly INNER DOOR PANEL ENS GIO OUTER DOOR HOUSING 3 Pull outer door housing away from inner door panel starting at the hinge side of door to separate the door halves NOTE The smaller radius of the step spacers fit into the slots of the outer door housing and is used to provide clearance for handle operation 4 Remove lock nuts and stepped spacers from threaded studs of door handle Page 10 of 24 24 SERIES STEAMERS REMOVAL AND REPLACEMENT OF PARTS OUTER DOOR HOUSIN 155 STEP SPACERS Handle Installation 1 Apply Lubriplate 630AA around slots of outer door housing where step spacers contact housing 2 Install door handle into outer door housing such that hinge side of door housing is to the left and arrow on handle is pointed upward 3 Install step spacer with smaller radius toward handle and door housing Smaller radius is a slip fit with outer door housing slot 4 STEP SPACER HIGH TEMP LUBRICANT 4 Install lock nuts and tighten until no gap exists between handle step spacer and lock nut Do not over tighten lock nuts 5 Close inner door panel so that latch mechanism engages striker on front panel Install outer door housing onto inner door panel Align the top and bottom screw holes of outer door housing with inner door panel INNER DOOR PANEL 1 OUTER DOOR Page 11 of 24 8 Apply Loctite 7471
17. e Phrange of Less than 13 ppm Less than 4 ppm 7 0 to 8 0 e Un dissolved Solids less then 5 microns 17 1ppm 1 grain of hardness Electric AMPERAGE PER LINE MODEL lE 3 PHASE 1 PHASE 208V 240V 480V 208V 240V 24 8 22 22 19 2 38 5 33 3 24 5 12 33 3 28 9 14 4 57 7 50 0 NOTES Amperage values in the table are nominal Tolerance is 5 10 2 C24EO3 Shipped for 208V 60 50 HZ phase connection Field convertible to 240V three phase or 208 240V single phase See wiring diagram AI2853 3 C24EO5 Shipped for 208V or 240V or 480V 60 50 HZ 3 phase 208V and 240V models are field convertible to 1 phase See wiring diagram AI2852 F25386 June 2010 24 SERIES STEAMERS GENERAL TOOLS Standard e Standard set of hand tools e Clear silicone sealant e VOM with an AC current tester any quality VOM with a sensitivity of at least 20 000 ohms per volt can be used e Temperature meter amp thermocouple Special e Thermal Transfer Compound Dow Corning 340 Part No 819643 2 13 5 oz tube or equivalent for heating element assembly e Thermal Transfer Compound Dow Corning 340 Part No 519504 2 oz tube or equivalent for thermostats e Torque wrench e Tile Trowel 3 16 x 5 32 V notch Grainger catalog stock number 5LG08 or equivalent for coating heating element assembly with thermal transf
18. en and low water light 1LT amber will come on and buzzer will sound F25386 June 2010 24 SERIES STEAMER ELECTRICAL OPERATION SCHEMATIC DIAGRAM PRIMARY TAPS OF CONTROL TRANSFORMER MUST BE CONNECTED ACCORDING TO THE APPLIANCE DATA PLATE AND THE ACTUAL CONNECTED SUPPLY CONTROL TRANSFORMER 1T COM 208V 240V 480V RELAY K3 START RESET MOM LIMITING HIGH LIMIT CONTACTOR 1CON 1TAS LOW WATER RELAY K2 2TAS REGULATING 1 2 CONTACTOR 2CON RELAY K1 DERIVED FROM 857590 1 Rev B F25386 June 2010 Page 20 of 24 24 SERIES STEAMER ELECTRICAL OPERATION WIRING DIAGRAMS HEATING ELEMENTS 24 208V 240V TO CONTROL 5 PHASE 208 240V TRANSF ORMER mado HEATING ELEMENTS 1 664W EA 208V 12667W EA 240V NOT USED FOR 240V OPERATION C24EO03 TO CONTROL TRANSFORMER 1 PHASE 208 240V HEATING ELEMENTS 1664W EA 208V 12003W EA 208V 12667W EA 240V Or REGULAT ING CONTACTOR NOT USED 240 OPERATION FOR OPERATION FROM A 208V SUPPLY ALL 6 ELEMENTS ARE TO BE CONNECTED AS SHOWN FOR 240V SUPPLY DISCONNECT AND INSULATE ELEMENT LEADS WITH ORANGE GREEN AND RED MARKERS PRIMARY TAPS OF CONTROL TRANSFORMER MUST BE CONNECTED ACCORDING TO THE APPLIANCE DATA PLATE VOLTAGE MARKING AND ACTUAL CONNECTED SUPPLY DERIVED FR0M 857591 3 Rev B Page 21 of 24
19. er compound e Loctite ODC Free Cleaner and Degreaser McMaster Carr Part No 66415A21 or equivalent fast drying no residue cleaner e Loctite 74717 Primer N Part No 544434 2 e Loctite 271 or equivalent e Loctite 242 Part No 520228 for threads of door screws e HTV 109 for securing gasket to door e Lubriplate 630AA for door handle sliding bracket F25386 June 2010 Page 4 of 24 24 SERIES STEAMERS REMOVAL AND REPLACEMENT OF PARTS REMOVAL AND REPLACEMENT OF PARTS COVERS AND PANELS WARNING Disconnect the Se S electrical power to the machine and follow lockout tagout procedures AA Side Panels 1 Remove screws from bottom of panel RIGHT SIDE PANEL b T d 22363 2 Slide panel down to clear top cover 3 Reverse procedure to install Top Cover 1 Remove SIDE PANELS 2 Remove screws securing rear of top cover TOP COVER 3 Remove nuts securing front of top cover Page 5 of 24 FRONT OF TOP COVER REMOVE NUT 2 PLACES 4 Lift top cover off machine 5 Reverse procedure to install Rear Panel 1 Remove screws securing rear panel STEAM VENT 30 22364 2 Disconnect tube from steam vent pipe 3 Remove rear panel 4 Reverse procedure to install COMPONENT PANEL COMPONENTS Disconnect the electrical power to the machine and foll
20. gized a Line voltage is supplied to other side of heating elements Elements heat 2 K1 N C contacts open Steamer reaches 175 F A Hold thermostat opens and relay K1 coil is de energized B K1 N C contacts close contacts open NOTE Steamer will maintain hold temperature until a cook time is dialed on timer door is opened or power switch is turned off Set cook timer to constant A Timer contacts 21 amp 23 close cook light SLT red comes B Temperature controller energized and evaluates input from thermocouple 1 is below set point temperature controller internal N O contacts close and energize regulating contactor 2CON coil thru K1 N C contacts a Line voltage is supplied to other side of heating elements Elements heat Temperature reaches set point and the temperature control s internal N O contacts open A Regulating contactor 2CON coil de energized and power is removed from heating elements Steamer cycles on the temperature control until cook timer turned off Turn cook timer off A Timer contacts 21 amp 23 open cook light SLT red goes out and temperature controller is de energized B Steamer reverts to hold temperature and continues to cycle until a cook time is dialed on timer power switch is turned to off or the door is opened NOTE If water level becomes low during cycling low water thermostat 2TAS will op
21. ion Control circuit fuse s open High limit thermostat open Door open or door switch malfunction Power switch off or inoperative Relay K3 malfunction Timer malfunction or timer off timed mode only Steamer will not heat cook light on low water light off Line voltage incorrect Heating element malfunction Regulating contactor malfunction Relay K1 malfunction Temperature probe malfunction Temperature controller malfunction Timer motor does not run Door open or door switch malfunction High limit thermostat open Low water thermostat open Timer inoperative Door not closing properly Door latch assembly Striker adjustment Door won t open Latch inoperative Buzzer not operating Timer malfunction Buzzer malfunction Water spraying out of steam vent pipe during a cook cycle Temperature control set point too high Temperature probe malfunction Temperature control malfunction High water usage Temperature control set point too high Temperature probe malfunction Temperature control malfunction Steamer operating in constant mode Excessive or inconsistent cook times COMO eee PO rec ear cese Docs dec CO Oc CELOS COS PO C yt Cou iaces GOTT eoe Pe Door left open between loads Temperature control set point too low Heating element malfunction F25386 June 2010 Printed in U S A
22. off or the door is opened NOTE If water level becomes low during cycling low water thermostat 2TAS will open and low water light 1LT amber will come on and buzzer will sound Timer and heating circuit will be de energized until water level is replenished and thermostat closes Constant Cooking Mode 1 Conditions A Steamer connected to correct voltage and is properly grounded B Power switch 1S off 1 Relay energized contacts open High limit thermostat closed Hold thermostat closed Low water thermostat closed Temperature control is setup properly and is ready to use o Door closed door switch closed H Timer off l Cooking compartment filled to the water level mark and below hold temperature of 175 F 5 F J Drain valve is closed drain lever pushed in Press momentary start switch 1S A Limiting contactor 1CON coil energized thru high limit thermostat 1TAS 1 Line voltage is supplied to one side of heating elements B Relay K2 coil energized thru low water thermostat 2TAS 1 K2 N O contacts close a Power switch circuit is latched 2 K2N C contacts open a Low water light 1LT and buzzer are de energized C ON indicator light 2LT amber comes on D Relay K1 coil energized thru door switch and hold thermostat 3TAS Page 19 of 24 1 K1 N O contacts close and regulating contactor 2CON coil is ener
23. ow lockout tagout procedures 1 Remove right side panel as outlined under COVERS AND PANELS F25386 June 2010 24 SERIES STEAMERS REMOVAL AND REPLACEMENT OF PARTS 2 Disconnect lead wires to component being replaced TRANSFORMER RELAYS TERMINAL TA BLOCK Br VOR TEMPERATURE g HIGH LIMIT CONTROLLER 222270 Remove component Reverse procedure to install replacement component and check steamer for proper operation NOTE If replacing temperature control see TEMPERATURE CONTROL CALIBRATION in SERVICE PROCEDURES AND ADJUSTMENTS TIMER WARNING Disconnect the electrical power to the machine and follow lockout tagout procedures 1 Remove right SIDE PANEL 2 Disconnect lead wires to timer 3 Remove timer knob F25386 June 2010 4 Remove rotary shaft seal from timer shaft and remove timer ROTARY SHAFT SEAL for proper operation HOLD THERMOSTAT WARNING Disconnect the electrical power to the machine and follow lockout tagout procedures 1 Remove right SIDE PANEL 2 Remove lead wires and mounting nuts 3 Remove hold thermostat 4 Apply a small amount of thermal transfer compound to the mating surface disk side of the replacement thermostat A Spread the compound completely and evenly over the surface of the thermostat 5 Reverse procedure to install and che
24. rgizes buzzer and de energizes temperature controller when time expires Monitors temperature probe and cycles power to regulating contactor 2CON for steam generation Senses cooking compartment temperature at steam vent and sends a corresponding DC voltage back to the temperature control J type thermocouple Steps down line voltage to 120VAC control circuit voltage Page 16 of 24 24 SERIES STEAMER ELECTRICAL OPERATION COMPONENT LOCATION TRANSFORMER RELAYS bees 89 E CONTROL PANEL COMPONENTS DOOR SWITCH TE ite Dy BUZZER ge a LA NJ A INDICATOR DIS M i gt RESET SWITCH WA 22374 s FRONT PANEL COMPONENTS Page 17 of 24 F25386 June 2010 SEQUENCE OF OPERATION C24EO SERIES STEAMER ELECTRICAL OPERATION Schematic diagram AI2851 will be used to explain the electrical sequence of operation Timed Cooking Mode 1 F25386 June 2010 Conditions A Steamer connected to correct voltage and is properly grounded B Power switch 1S off 1 Relay energized contacts open High limit thermostat closed Hold thermostat closed Low water thermostat closed Temperature control is setup properly and is ready to use D Door closed door switch closed H Timer off l Cooking compartment filled to the water level mark and below hold temperature of 1
25. s lod mana ente s Installation Operation and Cleaning 1 Introdu ctiori c nob Features v anit ipea cM be asha s S yaoa Steam GookIngi Model DesignatiOls 3 tote tm nece ee ope drea ante dieit eng sortes RD e Water Requirements rer e peres E xe ee bru ere Eae E pra 0 0 ated Electro oue rete dude w isuu TOONS c d REMOVAL AND REPLACEMENT OF PARTS 1 1 1 4 Covers lt and Panels 2 E Eres ooo eue Rue ane JD b e RE Component Panel Components Ta ha umaq wata Hold Thermostat Thermostat 45 eee ales weeding Low Water Thermostat Temperature Probe x x2 Pee IER Dr Qm oie ered ee bees Heating Element Assembly
26. ssembly is installed 5 Install pins to assemble stationary and sliding brackets together A Secure pins into position with E clip 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 HEADS OF PINS LATCH ASSEMBLY SPRING PIN 2 Install outer door housing assembly as outlined in DOOR HANDLE INSTALLATION F25386 June 2010 3 Check opening and closing operation of door 4 Check steamer for proper operation and leaks around door seal Hinge Bearings 1 Close door 2 Remove left SIDE PANEL 3 Remove nuts from upper hinge located inside front panel UPPER HINGE 10621 4 Open door slightly and while holding door pull upper hinge away from front panel Pull upper hinge out of upper door hinge bearing Lift door assembly up and off lower door hinge Pry hinge bearing out from door assembly Remove outer door housing NOTICE Do not drive bearing into place The inner door panel could be damaged Press bearing into position NOTE When replacing door hinge bearings replace both hinge bearings 9 Position replacement hinge bearing over hinge opening in door assembly HINGE BEARING A Press hinge bearing fully into door assembly using a C clamp or equivalent 10 Reassemble p
27. t check current draw ee amps through the heating element lead 2 3 208V units use three 2003W wires elements and three 664W elements NOTES 3 3 pan 208 240V units share the same NOTE This method is preferred over a element assembly block 240V units use resistance check when a clamp on type amp only the three 2003W marked elements meter is available 2667W actual 4 Resistance values ohms 77 F 1 If current draw is correct then heating room temperature element is functioning properly See table below for proper values 2 If current draw is not correct turn cooking mode switch to OFF and disconnect the electrical supply a Replace heating element assembly then proceed to step 3 C If unable to check current draw a resistance check may indicate a malfunctioning element 1 Turn the cooking mode switch to OFF and disconnect the electrical supply 2 Remove the lead wires from the heating element and check resistance ohms See table below for proper values F25386 June 2010 Page 14 of 24 24 SERIES STEAMER SERVICE PROCEDURES AND ADJUSTMENTS TEMPERATURE CONTROL CALIBRATION To set the temperature control for optimum steamer operation the elevation above sea level for the service location must first be determined The steamer was preset at the f
28. zed whenever Hold Thermostat 3TAS is closed or the temperature controller calls for heat Located below water reservoir Heats water to produce steam Protect control circuitry from over currents Amber AM colored light Lit when Low Water Thermostat 2 5 senses water level is too low inside steamer Amber AM colored light Lit when Power Switch 1S is on Red RD colored light Lit when High Limit 1TAS and Low Water 2TAS thermostats are closed door is closed and timer is set Controls Regulating Contactor 2CON based on input from Hold Thermostat 3TAS and Temperature Controller Does not allow Timer Motor to run while Hold Thermostat 3TAS is closed Latches Power Switch 1S circuit Turns on Low Water Light 1LT and Buzzer when steamer is low on water Controlled by Power Switch 1S Keeps Buzzer from sounding and Low Water Light 1LT off when switch is in off position Rocker switch that turns steamer OFF and ON momentary on Switch also resets Low Water Light 1LT and Buzzer Removes power from a portion of the steamer control circuit when door is opened Protects steamer by removing control circuit power if the heating element assembly temperature goes above 495 F Monitors presence of water inside steamer Controls temperature of cavity for pre heat hold mode opens at 175 F Disables timer countdown if cavity temperature is too low Counts cook time of product when time is dialed Ene
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