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SERVICE MANUAL

1. m Ue d r px type eddies 65 IGNITION MODULE be eben ur uias tbid area tabaco e a pA ree 66 COOLING FANS 67 DIAGNOSTICS TROUBLESHOOTING 4 2 4 22 2 1 2 21 4 68 SERVICE MODE 1963 anne oe aah 68 ERROR CODES rte tu Abi o Rinks a a 74 OVEN TROUBLESHOOTING hp er pee tied ed ra aide 78 QUICK OVER ALE CHECK Re enr 78 TROUBLESHOOTING USING ERROR CODES 78 TROUBLESHOOTING BY SYMPTOM 2 2 2 2 2 84 IGNITION CONTROL MODULE TROUBLESHOOTING 2720 2 2 88 IGNITION CONTROL MODULE TROUBLESHOOTING 2 2 88 VULCAN 2015 30f88 F45491 Rev 1215 ABC Combi Gas Oven SERVICE UPDATES SERVICE UPDATES SERVICE UPDATES ABC COMBI GAS OVEN January 2015 1 New Software version 08 11 14 A FIRMWARE VERSION HISTORY B FIRMWARE UPDATE PROCEDURE C USB ERROR MESSAGES F45491 Rev A 1215 4 of 88 Combi Gas Oven GENERAL GENERAL INTRODU
2. 4 2 2 2 2 02 2 2 7 4 2 2 2 2 2 F45491 Rev A 1215 E Page 2 of 88 Combi Gas Oven LOG INTO CONFIGURATION MODE 1972 2 2 2 2 0 444 35 TO REVIEW CHANGE CONFIGURATION MODE 1972 SETTINGS 35 LOGGING OUT OF CONFIGURATION MODE 1972 2 0 2 41 CALIBRATING OXYGEN SENSOR BOARD 4 2 41 GAS VALVE PRESSURE CHECK AND ADJUSTMENT 42 TEMPERATURE CALIBRATION 43 TEMPERATURE SENSOR RTD1 TEST 2 2 2 44 COMBUSTION ANALYSIS 2252 55 ce 44 CAVITY VENT SWITCH TEST AND ADJUSTMENT 4 4 2 2 45 FLAME SENSE VOLTAGE TEST FENWAL SERIES 35 61 46 DRAFT INDUGER TEST ettet alie ute 47 DOOR SWITCH ADJUSTMENT etae ac deti 47 EELECTRICAL OPERATION Rees e recolo enn ed ced ord Ea 49 COMPONENT FUNCTION 3 000002
3. knob turned 8 Enter Service Mode 1963 qun lett Cow will retum to Idle Verify that location now shows 08 11 14 as the firmware revision code is selected turned to the right cw the Humidity display briefly changes to show Yes then Del as the necessary flash is E6 error before the recorded oven hour deleted then begins showing a percentage count can be ignored complete from 0 100 as the software image is flashed When flashing is complete usually after only a few seconds the Humidity display briefly shows Don Don indicats the software flashed correctly Oven returns to the Idle Mode Temperature display Record HRS oven hour count USB ERROR MESSAGES Error Message Corrective Action Usb Host Con Removing the USB drive once the Temperature display returns to reinsert the USB drive or Usb Host Enu Usb No Fil The ABCombi bin file was not found on the USB drive Reload the ABCombi bin file USB Fail lt 1 20r3 USB drive needs to be formatted FAT32 format If this fails use a different USB drive Removing the USB drive once the Temperature display returns to reinsert the USB USB Fail lt 4 5 7 8 drive 15 18 If error persists use a different USB drive Removing the USB drive once the Temperature display returns to reinsert the USB USB Fail lt 9 14 gt drive If error persist replace Main Contro
4. Rer simt Aet CO e Ber Eat et aa 49 ELECTRICAL PANEL COMPONENT LOCATION 4 2 2 2 27 7 2 51 SEQUENCE OF OPERATION brote eee tete varies be ae e eee mace ade deals bp danda 52 CONDITIONS 52 ON OFF SWITCH SW4 TURNED NO CALL FOR HEAT 53 ON OFF SWITCH SW4 amp WITH CALL FOR HEAT 54 ON OFF SWITCH SW4 amp WITH CALL FOR HEAT amp CALL FOR HUMIDITY 55 OTHER SEQUENCES useing ed bea yuan bead 56 CIRCUIT BOARD LAYOUTS datas ad at Re dub b re dua 57 MAIN BOARD CONNECTIONS 1 2 2 2 2 1 4 2 2 2 7 4 2 2 2 2 222 57 6 e Cette de ses VS dta dude Lr Ped 60 IGNITION MODULE ette t e edes t ue Aue a 61 WIRING DIAGRAMS esee tI ER EU et tare deo tpe D tap ege o veri eee dg 62 TERMINAL BLOCKS AND TRANSFORMER 4 1 2 22 63 MAINBOARD pU tari le tops be tte dier d AS de eate da e de e 64 MOTOR BOARD 7 5 ugs
5. Li MNA LI LAM INTRODUCTION 224 ctm cL EL m eM UM D Pise tot OPERATION CLEANING AND MAINTENANCE 2 2 4 2 2 2 2 TOOLS capan Seem LUBRICATION 22 iini pie ette ree e aed he WATER QUALITY STATEMENT 4 2 2 2 2 2 SPECIFICATIONS ue rr eee sa mv dei dod ra bbb x ache sales fue UPGRADE ABC COMBI FIRMWARE 2 2 2 2 FIRMWARE VERSION HISTORY 4 7 27 2 2 FIRMWARE UPDATE PROCEDURE 2 2 4 2 2 2 2 2 4 22 2 22 USB ERROR bp REMOVAL AND REPLACEMENT OF PARTS 2 2 2 27 27 iav rarae ue sd s LUE Mie INNER DOOR Mare eroe pesti e E Rd Herc DOOR e PC DOORLATC H PET DOOR SWITCH hk CONVECTION FAN MOTOR tpi
6. Remove Right Panel Unplug two wires going to fan 1 2 3 Remove two screws securing fan to frame 4 Reverse procedure to install 5 Check for proper air flow Page 21 of 88 Fig 45 REAR COOLING A WARNING Disconnect the electrical power to the machine and follow lockout tagout procedures Remove Rear Panel Remove two wires going to fan 1 2 3 Remove nuts securing fan to frame 4 Reverse procedure to install 5 Check for proper air flow F45491 Rev A 1215 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS KNOB amp ENCODER NOTICE Certain components in this system are subject to damage by electrostatic discharge during field repairs A field service grounding kit is required to prevent damage The field service kit must be used anytime the control board is handled Control Knob amp Encoder 1 Remove CONTROL PANEL 2 control panel in a secure location NOTE Do NOT place control panel flat on knobs Doing so will cause damage to encoders CONTROL KNOB LIFT PANEL 3 PLACES 24951 Fig 47 3 Remove control base panel 4 Disconnect encoder ribbon cables DISPLAY BOARD NUTS RIBBON CABLE 10 PLACES 94 ENCODER RIBBON CABLE 3 PLACES Fig 48 5 Loosen set screw in tapped hole on knob F45491 Rev A 1215 FLAT OF ENCODER Fig 49 6 Rem
7. 2 gt PI FUSE P 12a P P 14e AUX 15 AUX PRI PIT PRI 8 FUSE FUSE F7 9 FUSE 6 25 2 Pl P20 PH NEUT 9 SOLID STATE RELAY DERIVED FROM 947551 Fig 105 F45491 Rev A 1215 Page 60 of 88 ABC Combi Gas Oven CIRCUIT BOARD LAYOUTS IGNITION MODULE IGNITION MODULE A13678 Fig 106 s Flame Current Test Pins 610f88 F45491 Rev A 1215 ABC Combi Gas Oven WIRING DIAGRAMS WIRING DIAGRAMS F45491 Rev A 1215 T RR Page 62 of 88 ABC Combi Gas Oven WIRING DIAGRAMS TERMINAL BLOCKS and TRANSFORMER INTERLOCKS RELAY DIAGRAM vac BLU WHT 145 230V P7 230v P8 Eeo common B 4 RED SS j ius TB420 12V OXY P7 200 202 12voxy P8 BU x 7 us 781 208V 43 TB4 18_ 12V LITE 5 BLK 149 RELAY DIAGRAM NS NCNO 12V LITE 1865 tav ure common 209 wat TB4 16_ 24V VENT GRY 151 204 211 5 P 1865 14 common veny T Vio 1 TB4 14_ 24V IM 57 YEL 153 24 IM COMMON ORN P7 P8 5 GRND SCREW CHASSIS POWER CORD POWER CORD BLACK GREEN TB1 13 120VAC PLUG D B TTB C D FUSE SERVICES c
8. AC VIO RED 152 146 285 CONVECTION FAN MOTOR 13672 45491 1215 ABC Combi Gas Oven WIRING DIAGRAMS IGNITION MODULE VAC IGNITION MODULE DETAIL 3 VAC 120V 24VIM 120V LINE 24V IM COM F4 TS1 4A FUSE LINK HI LIMIT BLKWHT SWITCH 136 137 219 144 5 3 5 4 IGNITION MODULE HI LIMIT u SENSE 227 R41 RELAY low bo heat THERMOSTAT 4173 INPUT SEE MAIN BOARD TOXH2 air sense 226 SW6 PRESSURE SWITCH 225 SPARK ELECTRODE WITH FLAME SENSE SCREW ON GAS CONTROL CHASSIS MTR 3 INDUCER MOTOR HS 3300 RPM 4 Q BLK LS RED 2300 RPM COM WHT DERIVED FROM 947551 A13673 Fig 110 F45491 Rev A 1215 66 of 88 WIRE 34 ON MAIN BOARD Combi Gas Oven WIRING DIAGRAMS COOLING FANS COOLING FAN DETAIL 2 CF1 COOLING FAN 1 CONTROL PANEL 79 81 82 P1 1 CF2 COOLING FAN 2 ELECT PANEL 138 5 1 COOLING FAN 3 OVEN REAR TB2 1 132 134 Page 67 of 88 F45491 Rev 1215 ABC Combi Gas Oven DIAGNOSTICS TROUBLESHOOTING DIAGNOSTICS TROUBLESHOOTING SERVICE MODE 1963 Log Into Service Mode 1963 1 Turn unit NOTE Oven must have no temperature set to enter Service Mode 2 Turn Timer knob counterclockwise until Timer display shows SEt
9. 13 Check for proper operation DRAFT INDUCER PRESSURE VOLTAGE SWITCH CABLE 4 3 Remove wires v WARNING Disconnect the electrical power to the machine S AS follow lockout tagout procedures Valve Power Output Pressure Switch Input Thermostat Input FC Flame Current Test FC Pins contact 4 Remove ignition module screws 5 Reverse procedure to install 3 Remove tube from pressure switch Page 29 of 88 F45491 Rev 1215 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS TRANSFORMER Ky A WARNING Disconnect the 2557 electrical power to the machine and Sue SS AES follow lockout tagout procedures S Sy 1 Remove Right Panel 2 Disconnect Plugs 7 and 8 going to Transformer AL 5 IGNITION MODULE Al3678 Fig 75 NOTE Make sure to keep the high voltage cable routed separately from flame sensor cable wire 206 and the ground wire wire 205 3 Remove two nuts on the left hand side of transformer bracket IGNITOR HIGH VOLTAGE CABLE SPARK IGNITION CABLE ONLY 82 9474 26792 Fig 76 Fig 78 6 Check for proper operation 4 Remove nut on the right hand side of transformer bracket F45491 Rev 1215 Page 30 of 88 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS Fig 79 CAUTION Transformer weighs 12 5 pounds and has a strong
10. 2 Remove door lock cover 24705 Fig 12 3 Remove cam screw and washer F45491 Rev A 1215 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS 4 Press torsion springs ends together to unlatch from the door lock clamp bracket CAM SCREW AND WASHER LATCH CAM BEARING SHAFT Fig 13 5 Press latch into door to remove cam 6 Reverse procedures to install 7 Check for proper operation Latch Assembly 1 Remove Door Cam 2 Remove retaining ring shim and ball bearing NOTE Press in latch for better access to retaining ring HEX SOCKET SCREW LATCH PRESSED RETAINING RING Fig 14 Remove hex socket screws x4 Latch spring and wear latch plate are now accessible for replacement Reverse procedure to install Check for proper operation F45491 Rev A 1215 DOOR SWITCH Ky A WARNING Disconnect the 2557 electrical power to the machine and Sue follow lockout tagout procedures S 1 Remove CONTROL PANEL NOTICE Do not place control panel on knobs Doing so will damage encoders Lift one side of control panel up to prevent knobs from touching surface CONTROL KNOB LIFT PANEL 3 PLACES 24951 Fig 15 2 Remove back control panel 3 Remove lock nuts CONTROL SWITCH BRACKET Fig 16 Slide reed switch out from control switch bracket Remove reed switch screws Reverse procedures to ins
11. Blower or AP switch problem Pre ignition air pressure up to speed Fenwal Module red light 1 flash ee Ignition Error Air flow fault 1 or Control Fault 1 Blower or AP switch problem Post ignition air pressure drops out while burning Fenwal Module Red light 1 flash 2 Internal control fault inside to Fenwal ignition module Fenwal Module Red Light Steady on E13 I Ignition Error Flame dropout Detection Fenwal re ignites after gas supply restored No fault flash but oven is not heating in this condition Post ignition flame drops out before controller set temperature is satisfied E14 5 neta Future Use Vent Error Either vent motor has problem and cannot rotate the vent switches out of adjustment and cannot tell vent motor when to stop its rotation at the open or closed position This means the system cannot humidify efficiently Although switches should seat into position within 15 seconds for a quarter turn error will not be logged until vent motor runs 75 seconds without completing E16 EA In cook mode where oxygen sensor oxygen sensor board has fallen out of its ready status 1 Stuck in warming 2 Communication error Page 77 of 88 M F45491 Rev A 1215 ABC Combi Gas Oven DIAGNOSTICS TROUBLESHOOTING 3 Internal oxygen board heating or calibration error ETT Lent F
12. Cold Water Condensate Sol1 F45491 Rev A 1215 ABC Combi Gas Oven ELECTRICAL OPERATION Low voltage outputs from transformer connection 4A Protects Oxygen Sensor Board 4A Protects Cavity Light circuit 4A Protects main board motor board low voltage portion vent switches door switches high limit sensing contacts 4A Protects Ignition Module circuit and Relay R4 6 25A motor current protection fuse F7 protects from a malfunction of the motor board s on board reversing relay 5 A Protects Oxygen Sensor Board Mounted on Oxygen Sensor Board Provides light for the oven cavity located in door frame Voltage to light circuit 12 Volt 5 Watt Bulbs Controls the oven cavity vent intake damper inside the Cavity Vent Intake Tube Reports the position open closed spin of the cavity vent intake damper Works in conjunction with SW2 Reports the position open closed spin of the cavity vent intake damper Works in conjunction with SW1 Admits water into the injection nozzle in a slow stream that drips onto water atomizer to vaporize the water droplets and provide steam for combi mode or cool the oven temperature Admits water into the injection nozzle in a slow stream that drips onto water atomizer to vaporize the water droplets and provide steam for combi mode or cool the oven temperature Circulate air through the oven control panel display panel and convection fan motor area for com
13. Oxygen sensor board revision power off on to recognize revision number date NOTE Must be revision 011 or higher e board transmitting a status Check connections HT Oxygen board is heating the oxygen sensor Wait 3 minutes for warming after power is applied 02 rdY Oxygen Board Oxygen Sensor board is ready and status transmitting humidity data NOTE Reported as a pair from sensor Cal Oxygen board can t calibrate itself Damaged Oxygen board O4 Cur Current error Oxygen board can t sense current in oxygen sensor heater Check for disconnected sensor Page 69 of 88 45491 1215 ABC Combi Gas Oven DIAGNOSTICS TROUBLESHOOTING Temp Display Description Timer Display Humidity Display Oxygen sensor data Shown in of Absolute Humidity This value will not match the Relative Humidity value shown on User interface at oven cavity temperatures less 051 Combine the two numbers to get Same value as P33 in 51 2 CONFIGURATION MODE 1972 NOTE Combine the numbers in the two displays to get the complete percentage Convection fan Test 1 Checks fan speeds 3 through 7 SPd lon Visually check for change in fan speed 2 Checks current sensing of move SPd lon oFF 3 4 5 6 7 Visually check for display to change from loFF to lon in Ti
14. IM COM input Output for Humidity fill valve high relay Output for Humidity fill valve low relay Main Board Connection Points Output Voltage readings ON OFF Switch ON Set to Temperature Knob gt Service Tests 80 F Mode ve ie 0 F 230 VAC as needed Controlled by temp or 230 VAC humidity settings F45491 Rev A 1215 2 58 88 ABC Combi Gas Oven CIRCUIT BOARD LAYOUTS Main Board Connection Points Output Voltage readings ON OFF Switch ON Set to Temperature Knob gt Service Tests 80 F Mode 230 VAC 230 VAC 230 VAC as needed when temp is within 50 of setpoint 230 VAC Controlled by oxygen sensor and humidity setting 0 230 for 6 seconds 230 6 every 2 hours to fill seconds when on off ptrap and if Drain 230 VAC Switch turned on Water Sensor Input calls for cold water 230 VAC for 15 230 VAC for 15 seconds when on off seconds controlled 230 for 15 switch turned on to oxygen sensor amp close vent humidity setting 13 TBA 9 0 VAC 12 when door is 12 VAC when dooris 12 VAC when open open door is open 24 VAC when call 24 VAC during CNAG heat is needed Y17 test 0 VAC 0 VAC 24 VAC Page 59 88 45491 1215 ABC Combi Gas Oven CIRCUIT BOARD LAYOUTS MOTOR BOARD P4 P5 P6 AUX ee
15. Indicates customer settings are currently loaded SEt Turn knob to edit custom settings oN TIP Select ALL on to begin customizing if minimal changes needed to FACt settings OFF TIP Select ALL oFF if you want to start customizing from scratch oFF Hum knob can be toggled to change individual 482 max temperature on or off Turn Timer knob through temperature choices F45491 Rev A 1215 5 Ho Page 36 of 88 ABC Combi Gas Oven SERVICE PROCEDURES AND ADJUSTMENTS Time Display Humidity Display Description Define Humidity Selection in UI NOTE Only when P4 is set to custom can settings in P5 and P6 be configured 90 humidity 0 96 Hum knob can be used to change humidity mapping to selected temperature 482 F Turn Timer knob through temperature choices The following is an example of customizing the P4 through P6 settings P4 set to CUSt Example 1 Toggle Hum knob to select CUSt settings 2 Turn Temperature knob to P5 ALL oFF 3 Toggle Hum knob oFF 4 Scroll timer knob to temperature of 212 212 F on 5 Toggle humidity knob to on 6 Scroll timer knob to 325 F 7 Toggle humidity knob to on 8 Turn Temperature knob to P6 9 Scroll timer knob to 325 212 F 10 Toggle knob to 096 325 F 11 At completion user interface is customized so user can only select 212F 100 or 325F 0 End of example Allows users
16. Inducer blower COM 120 to Transformer T1 TB1 9 TB1 8 for correct oven voltage on primary input of 1 1 Transformer step up from 120 to 230 VAC providing voltage for oven components solenoid valves motor board convection fan motor vent intake motor and cooling fans 2 Transformer steps down from 120 VAC to 24 VAC on two secondaries 24 VAC and 24 VAC IM a 24 VAC IM providing voltage for relay coils R4 R5 for high limit switch and for ignition module and gas valve call for heat relays b 24VAC providing voltage for main bd motor bd vent switches door Switch 3 Transformer steps down 120 VAC to 12 VAC on two secondaries 12 VAC Lite and 12 VAC Oxy a 12 Lite Light providing voltage for the cavity door lights b 12VAC Oxy providing voltage for oxygen sensor board and oxygen sensor 230 VAC A 230 VAC from transformer through TB1 6 to 1 On Off Switch SWA 2 Motor Interlock Relay R1 2 Common contact 230 VAC Com from transformer through TB1 3 TB1 4 and TB1 5 to 1 Cavity Vent M2 2 V2Main Board 3 Oxygen Interlock relay coil R3 B 4 Heat Interlock relay coil R2 B 5 Motor Interlock relay coil R1 B 6 Motor Interlock relay Common Contact R1 1 7 Cold Water Condensate Solenoid 1 8011 Humidity Valve Cavity Low Flow Solenoid 2 SOL2 Humidity Valve Cavity Hi Flow Solenoid 3 5013 10 Cooling
17. LED on Ignition module 1 IfLED is steady on replace Ignition module Perform CAVITY VENT SWITCH TEST AND ADJUSTMENT Inspect the vent tube to make sure itis not blocked in someway ABC Combi Gas Oven DIAGNOSTICS TROUBLESHOOTING Error In Service Mode 1963 1 03 Oxygen board Oxygen sensor status 00 Oxygen board transmitting status Check connections In Service Mode 1963 1 Run 01 oxygen sensor power test If test passes board has power but can not communicate replace Oxygen sensor board O1 HT Oxygen board is heating the oxygen Oxygen sensor sensor Does not steam in Combi mode Error dot the upper 2 Oxygen sensor board Wait 3 minutes for warming after left hand corner of the board power is applied humidity display Check sensor connections Missing Ferrite Make sure Ferrite is in place Check routing of cable going to Oxygen Sensor Replace sensor 02 rdY Oxygen board is transmitting humidity data from sensor Cal Oxygen board can t calibrate Replace Oxygen board Cur Current error Oxygen board can t sense current in oxygen sensor heater Check for disconnected sensor Replace sensor Fuse F1 fuse link in Does not steam in Combi terminal block mode Error dot in the upper left hand corner of the humidity display Fuse F8 on Oxygen Check fuses
18. NT T ee HOSE TO e MANOMETER Fc Fig 101 2 Log Into Service Mode 1963 A Turn unit on B Turn Timer knob counterclockwise until Timer display shows C Turn Humidity knob counterclockwise until Humidity display shows PAS 1 Timer display will show 2000 D Turn Timer display counterclockwise to 1963 1 Timer display will flash 1963 2 Timer and Humidity display will flash twice 3 Humidity display changes from PAs to tst when logging into Service Mode E Use the temperature knob to advance to Y16 Blower Air Pressure Switch test F Use the Humidity Knob to start the draft inducer fan The oven should pass the test NOTE The pressure switch requires a minimum of 1 W C negative pressure to operate Page 47 of 88 The reading on the manometer should be approx 3 WC of negative pressure 3 Exit Service mode A Turn Temperature knob counter clockwise until is displayed 4 Use temperature knob to make the setpoint 300 F A With the burner ignited the reading on the manometer should settle approx 1 6 WC of negative pressure 5 Turn temperature knob counterclockwise until 15 displayed 6 Log Into Service Mode 1963 A Turn Timer knob counterclockwise until Timer display shows B Turn Humidity knob counterclockwise until Humidity display shows PAS 1 Timer display will show 2000 C Turn Timer display counter
19. Turn Humidity knob counterclockwise until Humidity display shows PAS A Timer display will show 2000 4 Turn Timer display counterclockwise to 1963 A Timer display will flash 1963 B Timer and Humidity display will flash twice C Humidity display changes from PAs to tst when logging into Service Mode NOTE Humidity knob used to advance NOTE Tests function with door open or closed NOTE For some tests Y5 Y13 time display toggles between test number and data reading For example current temperature etc Temp Display Description Timer Display Humidity Display Current firmware code revision 0225 Month day year Time and CLS Switch closed High limit thermostat status HILt LO oPn Switch open State of Door Switch 4 CLS Switch closed oor Open Close door to test switch Lo oPn Switch open State of Switch on off Toggle front panel switch to test Electric vs Gas Auto detects if oven is gas or current oven temp Oven Cavity Temperature Or E2 error F45491 Rev A 1215 T RR Page 68 of 88 ABC Combi Gas Oven DIAGNOSTICS TROUBLESHOOTING Temp Display Description Timer Display Humidity Display on Err Verifies 12VAC is supplied to on Oxygen board is powered Oxygen Sensor Board Err Oxygen board is not powered example 011 If no revision number seen
20. to go to the next configuration setting NOTE Currently addresses P21 P22 P29 P30 P31 and P32 are blank 2 Presently P35 is the last address the counter will continue to go higher but the Time display and the Humidity display will be blank Turn the Humidity Knob to change the values as needed The following chart list the options for each address Temp Display Description Time Display Humidity Display 14 Current firmware code revision Month 0225 day year Time and Humidity show Year 2014 example Month 02 Date 25 Letter after number Rev within date Page 35 of 88 F45491 Rev A 1215 ABC Combi Gas Oven SERVICE PROCEDURES AND ADJUSTMENTS Time Display Humidity Display Temperature knob increments Temperature increment can be adjusted tInc 1 5 10 25 by 1 5 or 10 degrees Humidity knob increments Humidity can be adjusted by 1 or 10 HInC 1 and 10 percent increments Custom Operator Interface pL Factory Default UI Setting FACt Custom UI Setting CUSt Turn Hum knob between NOTE Operator can flip between FACt CUSt Custom Factory FACt and Custom settings will be remembered CUSt Description NOTE Only when P4 is set to custom can settings in P5 and P6 be configured Define Temperature Selection in UI NOTE Only when P4 is setto custom can FACt settings in P5 and P6 be configured CUSt
21. IGNITOR 8 Reverse procedures to install NOTE Make sure the switch on the gas valve is turned on Fig 61 9 Check for proper operation IGNITOR ky AWARNING Disconnect the xy S electrical power to the machine and 65 AS follow lockout tagout procedures di Ignitor Removal 1 Remove Right Panel F45491 Rev A 1215 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS 2 Disconnect high voltage cable from ignitor MN nee FLAME Fig 62 3 Remove ignitor screw 4 Pull ignitor to remove 5 Reverse procedures to install NOTE Make sure to keep the high voltage cable routed separately from flame sensor cable wire 206 and the ground wire wire 205 IGNITOR HIGH VOLTAGE CABLE 63 6 Check for proper operation F45491 Rev A 1215 FLAME SENSOR Ky DA A WARNING Disconnect the N electrical power to the machine and RAS a DIN follow lockout tagout procedures E Sy Flame Sensor Removal 1 Remove Rear Panel 2 Disconnect flame sensor cable wire 206 from flame sensor 3 Remove flame sensor screw 4 Pull flame sensor to remove BURNER NOR FLAME E Fig 64 5 Reverse procedures to install NOTE Make sure to keep high voltage cable routed separately from flame sensor cable wire 206 and the ground wire wire 205 Page 26 of 88 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS IGNITOR HIGH VO
22. LATCH Fig 6 3 inner door up off door hinge F45491 Rev A 1215 Fig 7 4 Place inner door a secure location to prevent damage 5 Reverse procedure to install INNER DOOR LATCH 1 Remove upper door stiffener screws and remove upper door stiffener UPPER DOOR STIFFENER SCREWS UPPER DOOR STIFFENER 26578 Fig 8 2 Remove inner door latch screws Page 10 of 88 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS INNER DOOR LATCH SCREWS 3 4 26577 Fig 9 Reverse procedure to install Check for proper operation DOOR LAMP A WARNING Disconnect electrical power to the machine and follow lockout tagout procedures Fig 10 Push in tab to free the glass cover from lamp holder Grasp lamp using cloth and remove from lamp socket Page 11 of 88 NOTICE Do not touch the Halogen lamp with bare hands If lamp is exposed to oil from skin life of the Halogen lamp will be reduced Skin oil may be removed with alcohol while lamp is cold NOTE Use a clean rag or paper towel to handle replacement lamp Ensure lamp is free from oil and dirt before replacing LAMP HOLDER Fig 11 5 Reverse procedure to install DOOR LATCH The oven and its parts are hot Use care when operating cleaning or servicing the oven The cooking compartment contains live steam Stay clear when opening door Door Cam 1 Open door and remove INNER DOOR
23. direction of the motor and toggles its state from on to off or off to on E Amber colored LED L1 pulses faint glow to indicate that a break signal is being sent to the external solid state relay F The Solid State Relay R6 pulses G Convection Fan Motor MTR1 electronically breaks H Amber L1 and Red L3 LED s off l The Solid State Relay R6 OFF J Convection Fan Motor MTR1 energizes Cold water condensate sequence 1 F45491 Rev A 1215 Drain water temperature is monitored by Main O board using the drain water sensor TC1 When the drain water temperature is above 140 F Cold water condensate valve SOLI1 is energized allowing cold water in When the drain water temperature is below 135 F A Cold water condensate valve SOL1 is de energized Every two hours Cold water condensate valve SOL1 energized for 6 seconds to ensure the Ptrap remains full of water so that cold air can not be sucked into drain and into cooking cavity Rapid Cool Feature 1 Page 56 of 88 Temperature setpoint is turned down by operator so that the RDT1 temperature is now higher than the temperature setpoint A Main board checks the status of the SW1 SW2 Cavity Vent switches 1 Ifthe switches indicate that the vent is closed the cavity vent intake motor is energized 2 When the switches indicate the vent is fully opened the cavity vent intake motor is de energ
24. intake vent and exhaust vents for blockage With no power applied check to see if the convection fan turns freely Incorrect air baffle position Poor seal on door 1 In Service Mode 1963 Temperature of drain water too high A Run Y9 Water drain condensate valve test F45491 Rev A 1215 86 of 88 ABC Combi Gas Oven DIAGNOSTICS TROUBLESHOOTING SYMPTOM POSSIBLE CAUSE In Service Mode 1963 A Check Firmware revision If earlier than 08 11 14 follow FIRMWARE UPDATE PROCEDURE Convection fan not working B Run F1 Convection Fan test If red LED is on when the motor is not running replace motor board If yellow LED is on and motor does run replace Solid State Relay Page 87 of 88 45491 1215 ABC Combi Gas Oven IGNITION CONTROL MODULE TROUBLESHOOTING IGNITION CONTROL MODULE TROUBLESHOOTING IGNITION CONTROL MODULE TROUBLESHOOTING LED DIAGNOSTIC INDICATOR CODES LED ON Control Fault E8 or E12 4 Flash Air Flow Fault E11 or E12 NOTE LED will briefly illuminate when oven is turned on 21 enon paiar any ofihese F45491 Rev A 1215 T RR Page 88 of 88
25. is energized Oven cavity door light Blower test Air Pressure Switch Timer display will initially read FAIL until blower has successfully turned on and up to speed and pressure switch has been opened Timer display will then read PASS Ignition sequence test Gas Only Timer Display Humidity Display VEnt CLSd SPIn 55 Display toggles indicates Switches are in spinning state 5 is an approximate number which indicates motor is energized properly When complete VEnt oPEn NOTE Err 5 switches are in an error state see CAVITY VENT NOTE Counts past 15 indicate SWITCH TEST AND Switches have not seated properly ADJUSTMENT Err displays after 75 seconds Test NOTE When timer display continues to run indicates that the vent motor is not drawing the proper current Humidity display shows CLS CLS turn humidity knob to initiate test Display counts up to 15 seconds if operating properly When complete Humidity knob will read oPn LItE when on Timer display toggles between LItE and a value to indicate lights are energized Expected values 75 for 3 lights 50 for 2 lights 25 for 1 light 0 for no lights on on blo on oFF FAIL PASS Resets ignition module faults F45491 Rev A 1215 bloO to blo9 rStO to rSt9 Turn humidity knob on to initiate test Page 72 of 88 ABC Combi Gas Oven DIAGNO
26. lite from transformer to TB4 through 4A fuse F2 to 1 V3 Lamp on Main board 12 VAC lite COM from transformer to 4 to 1 Cavity lights Lamps L1 L2 L3 COM No Call for Heat Motor Interlock relay coil R1 energizes A Provides 230 VAC across 1 wire 106 and P20 wire 107 on Motor Board Convection fan motor M1 energizes Heat Interlock relay coil R2 energizes Page 53 of 88 R2 1 closes providing 24 VAC IM to Ignition Module through R4 1 normally closed contacts Ignition Module performs a self check Ignition Module light flashes once and enters a thermostat scan state R2 2 closes allowing the Call For Heat signal input from the Main board to pass to both Ignition module and XH2 pressure switch Which is not asserted at this point R3 oxygen sensor board interlock relay coil R3 energizes A Providing 12 VAC Oxy to Oxygen Board across J1 wire42 and J2 wire 43 D3 amber D4 red D5 green LEDs energized for 2 seconds D3 amber LEDs energized for 3 seconds confirming calibration of electronics on board D4 red LEDs energized for 3 MINUTES while the oxygen board is heating up the oxygen sensor D5 green LEDs blinks indicating transmission of Humidity data from Oxygen sensor board through piggy back connection to Main board 230Vac to V1 on Main board A Main board sends Control signals through the ribbon cable to display board and
27. service grounding kit is required to prevent damage The field service kit must be used anytime the control board is handled Display Board 1 Remove CONTROL PANEL from unit 2 Place control panel in a secure location on a clean flat surface NOTE Do NOT place control panel flat on knobs Doing so will cause damage to encoders CONTROL KNOB LIFT PANEL 3 PLACES 24951 Fig 37 3 Remove screws from back of control base panel CONTROL BASE 7 T PANEL SCREWS 6 PLACES COOLING mni AR Fig 38 NOTE Use when removing back of control panel cover Wires are attached gt 45491 1215 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS NOTICE Certain components in this system are subject to damage by electrostatic discharge during field repairs A field service grounding kit is required to prevent damage The field service kit must be used anytime the control board is handled 4 Remove display board ribbon cable 5 Remove encoder ribbon cables 6 Remove display board nuts DISPLAY BOARD DISPLAY BOARD NUTS RIBBON CABLE 10 PLACES Sete every eters l ENCODER RIBBON CABLE 3 PLACES E 32 39 7 the new display board make sure that jumper J5 on the back of the display board is installed and on the correct two pins The two closest to the edge of the board JUMPER J5 26849 Fig 40 8 Reverse
28. to remove racks to dry cavity floor 4 Turn oven on and wait at least 3 minutes for sensor to warm up Log Into Configuration Mode 1972 1 Turn unit on 2 Turn Timer knob counterclockwise until Timer displays 3 Turn Humidity knob counterclockwise until Humidity displays PAS Page 41 of 88 Time Display Humidity Display YES don A Timer displays 2000 4 Turn Timer display counterclockwise to 1972 A Timer display will flash 1972 Timer and Humidity display will flash twice C Humidity display changes from PAS to CFg when logging into Configuration Mode Oxygen Sensor Board Check P33 1 Turn Temperature knob clockwise to P33 Timer display should read between 0 and 24 Humidity display should read between 00 and 99 NOTE If timer displays when viewing P33 oxygen sensor is warming Wait 3 minutes When ready Timer Humidity display will change to a numeric value Calibration of Oxygen Sensor Board P32 1 Turn Temperature knob counterclockwise to P32 Timer displays ZEro Humidity displays 2 With cavity door still open turn Humidity knob clockwise to yes NOTE Timer display will toggle between OPEN and DOOR and beeps if door is closed 3 Timer displays dry Humidity no after confirming cavity is dry Turn Humidity knob to yes F45491 Rev A 1215 ABC Combi Gas Oven SERVICE PROCEDU
29. view bucket list turn Temperature knob clockwise to start error buckets starting at EO If no errors have been recorded for EO then Temperature displays EO error code Timer displays ErrS Humidity displays End If no errors are displayed in error bucket turn Temperature knob clockwise to next error If errors are recorded in error bucket Temperature displays EO error code Timer and humidity displays oven hour count the error last occurred If multiple errors have been recorded will be displayed in Temperature display when Timer knob is turned clockwise the oven will display each recorded event and associated hour count The next hour count is shown in Timer and Humidity displays To view multiple hours recorded continue turning Timer knob clockwise Timer knob will show ErrS and Humidity display will show End when all recorded hours have been displayed NOTE Multiple errors can be recorded during the same hour turning the Humidity knob clockwise will skip hour by hour not displaying each individual recorded event EQ High Limit Error Critical Error Oven overheats tripping high limit thermostat and removes voltage from ignition module ETE Convection Fan Motor Error Critical Error Motor Board does not sense current to motor Possible causes 1 Convection fan has overheated and fan s thermal fuse has tripped or 2 motor board s 6 1 4 fuse amp has been blown E2 RTD Probe Error Cr
30. with nylon standoffs x10 Press board onto standoffs 4 Follow diagram Main Control Board Connections to rewire replacement board 5 Configure board to customer s preferred parameter settings noted prior to removing main control board See CONFIGURATION MODE 1972 for configuration settings Page 15 of 88 6 Referto CALIBRATING OXYGEN SENSOR BOARD 7 Check for proper operation OXYGEN SENSOR i WARNING Disconnect E N electrical power to the machine and S follow lockout tagout procedures A WARNING Oxygen sensor is very HOT Use care when servicing oxygen sensor NOTE Remove power from unit before replacing oxygen sensor Having power to board when installing sensor will cause damage oxygen sensor NOTE Sensor can be damaged by water Do not get wet 1 Remove Right Panel 2 Remove Rear Panel 3 Disconnect oxygen sensor cable at plug NOTE Do NOT disconnect cable from Oxygen Sensor Board A WARNING Allow Oxygen Sensor to cool completely before removing Sensor when powered and operating is very HOT 4 Remove all wire ties from oxygen sensor cable 5 After oxygen sensor has cooled loosen hex and caremlly remove sensor from fitting Fig 24 6 Reverse procedures to install 7 installing wire tie oxygen sensor cable as previously installed F45491 Rev A 1215 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS N
31. 0 F may indicate a problem with heat source For example poor combustion see combustion analysis F45491 Rev A 1215 ABC Combi Gas Oven SERVICE PROCEDURES AND ADJUSTMENTS 5 Calculate average Actual average Turn On Turn Off divided by 2 Variance between actual average and programmed setpoint of greater than 5 degrees indicates that adjustment is needed 6 To adjust A Enter CONFIGURATION MODE 1972 scroll temperature knob to P24 Turn humidity knob to enter offset NOTE Turn humidity knob clockwise for positive offset to lower overall cavity temperature NOTE Turn humidity knob counter clockwise for negative offset to raise overall cavity temperature B If actual average temperature is higher than programmed setpoint enter a positive offset value of same amount For example if oven is cycling around an actual average of 360 degrees adjust by entering an offset of 10 C Ifthe actual average temperature is lower than programmed setpoint enter a negative offset value of the same amount For example if oven is cycling around an actual average of 340 degrees adjust by entering an offset of 10 1 The offset can be adjusted or 30 degrees but is only functional within the operating limits of the oven Factory setting is 0 7 save setting exit configuration mode by turning temperature knob back to idle mode and listen for beep 8 To recall offset value enter CO
32. 15 ABC Combi Gas Oven DIAGNOSTICS TROUBLESHOOTING There are two ways error codes are stored sequential log and error bucket Sequential log A quick timed ordered list on errors recorded Error buckets Each bucket E0 E21 displays an individual error and every hour that the error occurred How to read sequential Log When Log is shown in Temperature display sequential error log is being displayed The last stored error is shown in the Timer display Then the Timer display in conjunction with the Humidity display toggles the hour count when error occurred Sequential Log 1 With Log displayed the temperature display 2 Timer Display toggles between E1 and 0009 3 Humidity display flashing 999 4 Means that E1 error occurred at cooking hour 9 999 This is a sequential log To view the next error recorded turn Timer knob clockwise If no more errors have been recorded Timer displays ErrS and Humidity displays End If multiple errors have been recorded will be displayed in Temperature display when Timer knob is turned The next error in the sequential log is shown in the Timer display Then the Timer display in conjunction with the humidity display toggles between error code and hour in which the error occurred NOTE As the sequential log stores multiple error logs only view the last few error codes to know what errors have occurred to prevent oven from working properly How to Read Error Buckets To
33. ARTS Fig 91 6 Loosen the two hose clamps securing the valve and free the valve from the two hoses Fig 92 7 Replace valve 8 Reverse procedure to install F45491 Rev 1215 Page 34 of 88 ABC Combi Gas Oven 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 and follow Arc Flash procedures If test points are not easily accessible disconnect power and follow Lockout Tagout procedures attach test equipment and reapply power to test CONFIGURATION MODE 1972 Log Into Configuration Mode 1972 1 Check with customer to verify settings have not been altered from factory settings 2 unit NOTE Oven must have no temp set to enter configuration Turn Timer knob counterclockwise until Timer display shows set 4 Turn Humidity knob counterclockwise until Humidity display shows A Timer display will show 2000 5 Turn Timer display counterclockwise to 1972 A Timer display will flash 1972 B Timer and Humidity display will flash twice C Humidity display changes from PAS to CFg when logging into Configuration Mode D Temperature Display will go to PO which is the first configuration setting To review change Configuration Mode 1972 settings 1 Turn the Temperature knob clockwise one step at a time
34. Accurate gas pressure adjustment can only be made with the burner on NOTE Turn adjustment screw clockwise to increase the pressure Turn adjustment screw counterclockwise to decrease pressure 6 Set Manifold pressure to 3 5 W C NOTE Always replace the adjustment cap after adjustment and securely tighten to ensure proper operation 7 Close Outlet pressure Tap by turning screw CW until tight Page 43 of 88 Astudes Natural Gas LP Gas _______ 6 Static Line eis Manifold wc 10 W C Pressure BTU s Hr 80 000 80 000 TEMPERATURE CALIBRATION 1 temperature tester probe in geometric center of oven cavity 2 Program a setpoint of 350 F Allow oven temperature to cycle 3 times NOTE Oven s temperature display shows setpoint To view actual cavity temperature as it cycles around setpoint slightly turn temperature knob clockwise one notch or counter clockwise one notch and actual cavity temperature will blink three times NOTE Turning temperature knob more than one notch will change temperature setpoint 3 Record temperature tester readout for an additional 3 cycles It should cycle around setpoint Temperature Data Recording Table Actual Temperature Average Temperature Tester Turn On Tester Heater Turn Turn Off divide by 2 Heater Turn off 4 Calculate amplitude Amplitude Turn Off Turn On An amplitude of more than 4
35. CTION General This manual is for ABC7 Combi ovens Ovens feature a powered vent damper advanced digital control panel with digital display for setting cook TEMPERATURE TIME and HUMIDITY Heating The ABC Combi oven reaches baking temperature of 350 F at 0 humidity in approximately 5 to 6 minutes however 20 minute preheat is recommended Combi Ovens Combi ovens provide convection heat steam heat or a combination of both in a single compartment cooking chamber Humidification is provided by water injection into oven cavity Water is injected by means of an internal nozzle it vaporizes on contact with hot interior surfaces Steam System All combi ovens come with a boiler less flash steaming system which provides a quick response time as well as excellent cooking results All information illustrations and specifications contained in this manual are based on latest product information available at time of release OPERATION CLEANING AND MAINTENANCE Refer to Installation amp Operation Manual F47110 for specific operating instructions TOOLS Standard 1 Standard set hand tools 2 Metric set of hand tools 3 VOM with measuring micro amp current tester Any VOM with a sensitivity of at least 20 000 ohms per volt can be used 4 Inclined manometer Dwyer Cat 1227 or equivalent 5 1 4 T with 1 4 tubing Temperature tester thermocouple type Page 5 of 88 7 Field service groun
36. D SCREW CHASSIS 545 cavity vent x DOOR LIGHTS 22 276 SWHALOGEN cavity vent x SPADE TERMINALS POWER SUPPLY 2 chassis CHASSIS TO GROUND SCREW heat 3WAY JUMPER SEE IGNITION MODULE DETAIL3 MTR2 CAVITY VENT P3 4 P3 8 69 33 63 e 23 26 DERIVED FROM 947551 F45491 Rev A 1215 condensate fill Y9 SNUBBERY snubber MOTOR INTERLOCK INTERLOCK OXYGEN INTERLOCK Fig 108 64 88 36 62 e 65 8013 HUMIDITY VALVE CAVITY HIGH FLOW 2 2 P2 5 SOL2 HUMIDITY VALVE CAVITY LOW FLOW P24 P24 SOL 1 COLD WATER CONDENSATE 64 MOTOR HEAT OXYGEN INTERLOCKED TO ON OF SWITCH 13674 SECONDARY VAC 230V PH 24V GRY REF F3 151 4A FUSE LINK 4 16 T8415 84 0 2 BLUMWHT 145 R1 2 5 440 NO TO MAIN I O BOARD TERMINAL BLOCK TB2 ee el En E Ax Bu 9191 CONV FAN BK 8 92 PRIMARY cowFN 619 FUSE 519 OVENSENSOR 3 97 COOLING FANS 15 1 133 DERIVED FROM 947551 ABC Combi Gas Oven WIRING DIAGRAMS MOTOR BOARD MOTOR BOARD DETAIL 1 MOTOR BOARD ZERO CROSS CURRENT SENSE REVERSE SOLID STATE RELLAY Fig 109 Page 65 of 88 FROM TRANSFORMER SECONDARY VAC 240 230V COM COM
37. Dex nest p e CONVECTION FAN BAFFLE bei a ia MAIN CONTROL BOARD teret e Gay OXYGEN SENSOR Ie reda gee M OXYGEN SENSOR BOARD o oii ee Ded bodie i FERRITE ee p IIT MOTOR CONTROL BOARD 2 4 24 CONTROL PANEL qs etre bep etas teruel el te radio boe ON OFF eR e Mand Tg ded P RE qua DISPLAY BOARD senec CONTROL PANEL COOLING FAN 2 2 2 7 2 CONTROL BOX COOLING FAN 4 4 2 2 2 2 24 REAR COOLING nU a A A drat i e aderit KNOB amp ENCODER Deis subi tangs salad x a e ud Tied HI EIMIT THERMOSTAT a tanita rere bres hae ad a eds CAVITY INTAKE TUBE ASSEMBLY 4 7 CAVITY VENT MOTOR eere p RR P spere ederet adiens eerie ier CAVITY VEN
38. Fans CF1 2 7 24VAC IM A Page 52 of 88 24 VAC IM from transformer to TB4 14 through 4A fuse F4 to 1 High Limit Switch TS1 2 High Limit Sense Relay Coil R5 A through TS1 3 V6 Main I O board 4 V5on Main I O board 24VAC IM Com from transformer to 4 1 4 2 and 4 3 to 1 High Limit Sense Relay Coil COM 5 B 2 Gas Valve V1 COM 3 V1 24 COM supply Ignition Module 4 call_for_ heat common Main I O board 5 V11 fault detect common Main I O board 8 9 10 ON OFF Switch SW4 turned 1 2 ABC Combi Gas Oven SEQUENCE OF OPERATION 6 Blower Test Relay Coil COM R4 B 24 VAC A B 24 VAC from transformer to TB4 16 through 4A fuse F3 to 1 Cavity Vent Switch SW1 COM Cavity Vent Switch SW2 COM HiLimit Sense Relay R5 1 COM Door Switch SW3 a A V9 connection on Main Board 6 P21 connection on Motor Control Reversing Board 24VAC Com from transformer to TB4 5 and TB4 6 to 1 P22 connection on Motor Control Reversing Board 2 V8 connection on Main I O Board 12 VAC oxy A 12 VAC oxy from transformer to TB4 thought 4A fuse F1 to 1 Oxygen board interlock relay COM contact R3 1 12 VAC oxy COM from transformer to 4 to 1 Oxygen board interlock relay COM contact R3 2 12 VAC lite A 12 VAC
39. LTAGE CABLE 65 6 Check for proper operation BURNER A WARNING Disconnect the electrical power to the machine and follow lockout tagout procedures 1 Remove manifold screws 2 Gas valve gas line and manifold can be place aside NOTE It is not necessary to remove gas line Gas line can be used to hold gas valve and manifold assembly 3 Remove burner ground screw from burner 4 Remove burner screws to remove burner 5 Remove burner seal NOTE A scraper be used to remove burner seal BURNER SCREW 6 PLACES SN Fig 67 6 Reverse procedures to install 7 Check for proper operation INDUCER BLOWER A WARNING Disconnect electrical power to the machine and follow lockout tagout procedures 1 Remove Right Panel 2 Remove Rear Panel 3 Disconnect inducer blower wires 211 Black 213 White 4 Remove motor shroud screws 5 Lift up and towards front of unit to remove Page 27 of 88 F45491 Rev 1215 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS MOTOR aa ae ae ee ee ET EE PNT saoup DEEL EACH NOE ASSEMBLY SCREWS 2 PLACES WARNING Disconnect SS electrical power to the machine and follow lockout tagout procedures Remove Right Panel Remove Rear Panel Remove INDUCER BLOWER Remove insulation above inducer blower INDUCER BLOWER ev oo Remove insulatio
40. NFIGURATION MODE 1972 turn temperature knob to P24 Verify the value set is visible in humidity TEMPERATURE SENSOR RTD1 TEST WARNING Disconnect the electrical power to the machine and follow lockout tagout procedures 1 Remove Right Panel 2 Remove probe lead wires from Main board 3 Test probe with an ohmmeter F45491 Rev A 1215 5 200 680 250 732 300 785 350 836 400 887 450 938 COMBUSTION ANALYSIS 1 Verify the manifold pressure as outlined under GAS VALVE PRESSURE CHECK AND ADJUSTMENT 2 Insert combustion analyzer meter 8 into air sampling tube at aprximately 300 F 50 F 149 C 25 C for combustion tests COMBUSTION ANALYZER METER 96 3 Set oven temperature to 450 F 230 C with a burner flame established take combustion measurements O2 and CO readings A If correct combustion readings can not be obtained verify orfice size is correct for gas type Refer to ABC Combi Oven Gas Elevation Conversion Kit for proper orfice size Page 44 of 88 ABC Combi Gas Oven SERVICE PROCEDURES AND ADJUSTMENTS O2 Range 4 to 10 2 CO Not to exceed 0 04 400PPM NOTE If correct combustion readings can not be obtained contact Cooking Support CAVITY VENT SWITCH TEST AND ADJUSTMENT Y10 TEST Y10 test measures several things Motor current conditions of the two vent switches and the time it takes for the two swit
41. ONENT FUNCTION Main Board Display Board Motor Control Oxygen Sensor Oxygen Sensor SW5 RE Door Switch SW3 ON OFF Switch Encoders SW7 SW8 5 9 1 Terminal Block Manages all input output functions of oven as required for combi cook operation Monitors oven temp RTD probe and outputs call for heat to ignition module Monitors oxygen sensor board and outputs to humidity valves Monitors condensate tempering thermocouple probe and outputs to condensate valve monitors door switch and controls cavity lights Outputs to motor control board to control speed and direction of Convection Fan motor Rotates the cavity vent intake damper from open closed using the cavity vent motor output and two cavity vent switch inputs Monitors on off switch to change operator interface from sleep wake mode Enables cooling fans Monitors the display board for customer input from knobs and sends time temperature and humidity information to display board Also monitors ignition module NC output pressure switch NC contact for ignition errors Monitors N O relay contacts for high limit errors and monitors oxygen board and motor board for oxygen sensor and convection fan motor errors Processes signals from each encoder mounted to each of the three control knobs Then sends signal to Main board processes input signals from Main bo
42. OTICE Oxygen Sensor cable can not lay on the bottom of the oven NOTICE Oxygen Sensor cables are sensitive to electrical noise and must be routed away from other wires 8 Powerunit on 9 CALIBRATING OXYGEN SENSOR BOARD 10 Check for proper operation OXYGEN SENSOR BOARD WARNING Disconnect electrical power to the machine and follow lockout tagout procedures NOTICE Certain components in this system are subject to damage by electrostatic discharge during field repairs A field service grounding kit is required to prevent damage The field service kit must be used anytime the control board is handled 1 Remove Right Panel 2 Remove electrical connections from oxygen sensor board NOTE Note locations of wires 3 Remove oxygen sensor board screws Retain screws for installation of replacement oxygen sensor board OXYGEN SENSOR BOARD SCREWS Fig 25 NOTICE Oxygen sensor board must be installed while unit is unplugged Failure to Do so will cause permanent damage to oxygen sensor board Installation of Oxygen Sensor Board F45491 Rev A 1215 1 Verify oxygen sensor board holes line up with the main control board holes NOTE Connect 9 pin connection on back side of oxygen board header to 9 pins located on main control board oxygen board header MAIN CONTROL BOARD OXYGEN BOARD HEADER PIN CONNECTION MAIN CONTROL BOARD 24947 Fig 26 Secure using screws f
43. RES AND ADJUSTMENTS Convection fan turns NOTE Oven cavity temperature must be below 100 F 4 If temperature not less than 100 F 38 C timer display toggles cool xxx F xxx F xxx C current temperature until temperature is below 100 F 38 C 5 Timer display flashes when conditions are ready for calibration NOTE If conditions are not met P33 less than or equal to 24 cavity temperature less than 100 F 38 C with door open and convection fan up to speed Time knob will not enter 0000 and beep 6 Turn Timer knob clockwise to 0000 one digit at a time 7 Timer displays donE and Humidity displays yes when complete 8 Convection fan turns off NOTE To exit out of calibrating oxygen sensor board before calibrating turn Humidity knob to no or turn Temperature knob to exit Oxygen Sensor Board Check 1 Turn Temperature knob clockwise to P33 Timer display should read between 0 and 2 Humidity display should read between 00 and 99 NOTE This value should be near 0 For example timer 2 humidity 99 represents 2 99 Exit out of Configuration Mode 1972 1 Turn Temperature knob counterclockwise until displayed GAS VALVE PRESSURE CHECK AND ADJUSTMENT Ly V WARNING Disconnect NS S electrical power to the machine and D AS follow lockout tagout procedures E There may be multiple circuits Be sure all circuits are disconnecte
44. SERVICE MANUAL VULCAN ABC Combi Gas Oven ABC7G ML 137715 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 required to 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 A product of Vulcan Hart 3600 North Point Blvd Baltimore MD 21222 F45491 Rev A 1215 Combi Gas Oven TABLE OF CONTENTS SERVICE UPDATES ian eeu s het het ed tae uan d terii iet ade toria a nola dua SERVICE UPDATES ABC COMBI GAS OVEN 4 4 1 2 22 GENERALS 1 rt eoe sut n oM
45. STICS TROUBLESHOOTING Temp Display Description Timer Display Humidity Display NOTE 1 is the spark from Tests ignition module gas valve pressure switch induction NOTE does not display wait blower and spark ignitor approximately 30 seconds for error codes to generate If error codes generate refer to ERROR CODES 1963 Heat test rate of temperature rise tst NOTE If cavity temperature is When heat test passe turn above 400 F oven will beep and 115F PASS Humidity knob counter clockwise turn off test Turn Humidity knob to turn test off to turn off beep NOTE If test fails for example gas turned off to unit test will stop and error code will be Example Err Example E11 shown f error codes generate refer to ERROR CODES 1963 Displa Temperature Timer Humidity displays sequence thru dots Test assure led light segments digits 0 9 operate Example 000 111 etc Humidity Water Counter Example 999 NOTE Same value as P19 in Example 0009 CONFIGURATION MODE Example Total gallons 9 999 1972 Condensate Tempering Water Counen Example 999 NOTE Same value as P20 in Example 0009 Example Total gallons 9 999 CONFIGURATION MODE 9 1972 Cooking Hours NOTE Same value as P18 in Example 999 CONFIGURATION MODE Example 0009 1972 Example Total hours 9 999 Ho
46. T SWITCHES 25 cated be e gd era ei EDU e dere siae IGNIT OR EEUU FLAME SENSORS uibs ep eS ipea cast aah arth amen esee BURNER SER at ade ARM o freut eu ee ORUM INDUCER BLOWER oe rose date Rh HEAT EXCHANGER ASSEMBLY DRAFT INDUCER PRESSURE SWITCH 2 272 2 2 IGNITION MODULE a AMI TRANSEORMER 4 e Dr TEMPERATURE SENSOR RTD1 2 2 2 7 2 7 DRAIN WATER CONDENSATE VALVE 2 0042 0 2 DRAIN WATER THERMOCOUPLE 2 2 2 HUMIDITY VALVE Luiz eoi qt ocio er SERVICE PROCEDURES AND ADJUSTMENTS III II rre CONFIGURATION MODE 1972
47. TOP BAFFLE HANGERS BOTTOM BAFFLE SUPPORT GUIDES Fig 22 NOTE Gas Unit shown MAIN CONTROL BOARD Certain components in this system are subject to damage by electrostatic discharge during field repairs A field service grounding kit is required to prevent damage The field service kit must be used anytime the control board is handled 1 Check CONFIGURATION MODE 1972 for customer s current parameter settings Document customers parameter settings Page 14 of 88 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS NOTE This step can only be accomplished if main control board is still operational NOTE Oven hour counter P18 water counter values P19 P20 and error log will start new with replacement main control board W SA A WARNING Disconnect the N electrical power to the machine and follow lockout tagout procedures 2 Remove Right Panel 3 Remove electrical connections from main control board and oxygen sensor board 4 Remove main control board NYLON 5 10 PLACES Fig 23 NOTE Squeeze nylon standoffs to release board 5 Remove OXYGEN SENSOR BOARD from main control board Installation of Replacement Control Board 1 Install OXYGEN SENSOR BOARD onto replacement main control board NOTE Oxygen sensor board is easier to install onto main control board before installing main control board 2 Line up holes on new main control board
48. When trays of frozen product are placed in the oven and the oven is recovering up to setpoint the temperature in the center of the oven and the temperature in the upper corner where the temperature probe is are going to be different To make up for this the first time the oven tries to reach setpoint the control board will keep calling for heat until the temperature at the temperature probe is 50 degrees higher than the setpoint This feature automatically kicks in if the following conditions exist 1 The temperature setpoint is higher than 250 F 2 Ittakes longer than 8 minutes to reach setpoint 3 This must be the first call for heat cycle The first call for heat cycle is defined as the first time the control board calls for heat after a Firsttime a temperature setpoint is entered in cook mode a When temperature is set from b When On Off switch is toggled and temperature is automatically recalled b When the temperature setpoint is changed c When it is detected that the door goes from being opened to closed in cook mode 15 Y14 call for heat relay de energizes 16 Ignition Module de energizes Gas valve V1 17 Ignition Module de energizes Combustion blower MTR3 ON OFF Switch SW4 ON amp with Call for Heat amp Call for Humidity Humidification Sequence blower test relay R4 off Page 55 of 88 1 Humidity knob automatically changes to the mapped humidity for t
49. ard to refresh displays with Time Temperature and Humidity cooking information Low voltage portion of the board processes drive signal amber led and reverse signal green led from the Main board to control an on board reversing relay and external solid state relay The reversing relay contacts on the high voltage side of the board reverses voltage phases to change the motor rotation direction The solid state relay wired to the motor board power the convection fan motor The motor neutral phase is daisy chained with convection fan motor s thermal fuse and F7 motor current protection fuse at the motor board The motor board s current sense circuit monitors the current through the fuses and sends a low voltage signal back to the main board viewed on the RED led on the low voltage side The current sense circuit is also responsible for detecting E1 and E6 errors Heats and controls the oxygen sensor and reports back oven cavity humidity information to the Main board also receives calibration command from Main board Measures the amount of humidity in the oven cooking cavity and is controled by oxygen sensor board Magnetic reed switch it senses the presence of the magnet in the door and closes Monitored by the main board which starts stops the cook cycle and activates the lights based on the state of the door switch Is a toggle switch that is monitored by main board to put unit from sleep to cooking idle mode It provides 230 VAC to t
50. board R3 relay Page 83 of 88 2 45491 1215 ABC Combi Gas Oven DIAGNOSTICS TROUBLESHOOTING Error In Service Mode 1963 A Run Y6 Cooling fans test 1 The Timer display alternates between CFan and a value A value below 65 means at least one fan is not running No obvious symptom 1 Cooling Fan Troubleshooting by Symptom NOTE It is highly recommended that you check the error log and run the test available in reference Facilities main circuit breaker open Oven power cord unplugged Fuse F3 Incorrect wiring of On Off switch Oven completely inoperative No display on display board Ribbon cable going from Main board to Display board not seated correctly Display board inoperative Transformer T1 malfunctioned Control board inoperative In Service Mode 1963 A Check error log for EO E1 and E2 errors NOTE If any of the 3 errors are logged follow Troubleshooting using Error Codes In Service Mode 1963 A Run 56 Door test Encoder malfunction Oven does not operate Display is on Check that the jumper J5 on back of Display Board is on the correct set of pins A jumper should be on the two pins closes to the edge of the board NOTE This is the 5V position In Service Mode 1963 A Check error log for E1errors Oven operates Door closed and NOTE If any errors are logged follow Troubleshooting using convection fan
51. ch 1 If reading on the meter indicates an open then pull the top of the switch away from the camshaft If the meter reading indicates continuity continue to next step 6 Press the top side of the switches towards the camshaft until the meter indicates an open 7 Tighten the screws securing the switches 8 Usethe meterto check the common terminal and Fig 100 the N C contact of both switches Both switches 2 Meter should read 7 volts or higher at this point should read open NOTE If reading is below 0 volts reverse meter 9 Quick check leads and take another reading A Connect a meter set to check resistance to 3 Disconnect power and reconnect leads for the common terminal and the N C contact proper polarity of switch 1 4 4 Check for proper operation B Using a pair of channel locks rotate the damper camshaft through one revolution C During one revolution of the Cam shaft the meter should indicate continuity at two different spots These two spots should be 180 from each other D Repeat this check for switch 2 F45491 Rev A 1215 Page 46 of 88 ABC Combi Gas Oven SERVICE PROCEDURES AND ADJUSTMENTS DRAFT INDUCER TEST 4 S electrical power to the machine and follow lockout tagout procedures L WARNING Disconnect the N 2 1 Using two 1 4 hoses and a T connector connect an incline manometer inline between the inducer fan and pressure switch m 4 dp
52. ches to indicate a change for the vent Each time the test runs the motor should turn of a turn is what it takes to make the vent to go from fully closed to fully open or from fully open to fully closed It is recommended that the test be run eight times to make the motor go thru 2 full cycles If no errors are encountered the vent switches and vent 3 motor are operating properly 1 Go into reference 2 the temperature knob until Y10 comes the display 3 Turn the Humidity knob one step clockwise NOTE The test should take about 15 seconds NOTE The Timer display will go from VEnt CLSd to SPin 5 to VEnt oPEn or VEnt oPEn to SPin 5 to VEnt CLSd 4 If test ran successfully turn Humidity knob one step to run test again Do this till test has been run 8 times If an error occurs 1 If the Timer Display shows Err this means the vent switches are in an error state and need adjusted or replaced 2 Ifthe Timer Display shows Err this means the vent motor did not draw current 3 75 seconds the vent switches do not indicate has been made the Humidity display shows Err VENT SWITCH ADJUSTMENT WARNING Disconnect the electrical power to the machine and follow lockout tagout procedures 1 Remove reference Page 45 of 88 Loosen screws securing the vent screws to the frame by 1 4 turn to allow the top of the switches to be adjust
53. clockwise to 1963 1 Timer display will flash 1963 2 Timer and Humidity display will flash twice 3 Humidity display changes from PAs to tst when logging into Service Mode D Use the temperature knob to advance to Y16 Blower Air Pressure Switch test E Use the Humidity Knob to start the draft inducer fan oven should pass the test Now with the heat exchanger being at 300 F the reading on the manometer should be approx 2 of negative pressure 7 Exit Service mode A Turn Temperature knob counter clockwise until is displayed DOOR SWITCH ADJUSTMENT 1 In SERVICE MODE 1963 run Y6 Door test NOTE If the door test reports that the door is open when it is closed it may be because the door reed Switch is not lined up with the magnet in the door F45491 Rev A 1215 Combi Gas Oven SERVICE PROCEDURES AND ADJUSTMENTS To adjust the door reed switch Uy Sy Disconnect the HWS electrical power to the machine and follow lockout tagout procedures A Remove Right Panel B Remove CONTROL PANEL Loosen the two screws securing the Reed Switch to the bracket to adjust the Reed Switch side to side Fig 102 D Loosen the two bolts securing the Reed Switch bracket to the control panel to adjust the Reed Switch up and down F45491 Rev 1215 Page 48 of 88 ABC Combi Gas Oven ELECTRICAL OPERATION ELECTRICAL OPERATION COMP
54. d WARNING Shut off the gas before servicing the unit STATIC LINE PRESSURE 1 Remove Right Panel F45491 Rev A 1215 ON OFF TERMINALS INLET SWITCH PRESSURE PRESSURE REGULATOR OUTLET REGULATOR PRESSURE VENT TAP 26580 Fig 93 2 Manifold Pressure A Open Inlet pressure Tap by turning screw 1 to 2 turns CCW B Attach manometer hose to Inlet pressure Tap Fig 94 C Reconnect power and turn gas supply on D If static line pressure exceeds 14 W C 75 psig the customer must supply and install a pressure reducing valve to reduce the pressure below the maximum allowable for the valve E Close Inlet pressure Tap by turning screw CW until tight Page 42 of 88 ABC Combi Gas Oven SERVICE PROCEDURES AND ADJUSTMENTS A WARNING Disconnect the electrical power to the machine and follow lockout tagout procedures There may be multiple circuits Be sure all circuits are disconnected A WARNING Shut off the gas before servicing the unit Manifold Pressure 1 Open Outlet pressure Tap by turning screw 1 to 2 turns CCW 2 Remove the pressure regulator adjustment cap from the main gas valve to access the adjustment screw 3 Attach manometer hose to Outlet pressure Tap ADJUSTMENT SCREW 1 3 OUTLET PRESSURE Fig 95 4 Reconnect power and turn gas supply on 26848 5 Set Temperature knob to call for heat NOTE
55. d In some cases it may be needed more than once a day to prevent compounding of contaminants deposited inside cavity even with acceptable filtration Failure to wash and rinse down the cavity daily could result in damage of the oven cavity and interior parts A Reverse Osmosis water treatment system can be installed to eliminate chlorides or other contaminates from the water if needed F45491 Rev A 1215 Combi Gas Oven GENERAL NOTE Failure to properly maintain water quality or preventative procedures for water can lead to issues not covered under warranty WATER SUPPLY GENERAL GUIDELINES 1 Supply Pressure dynamic flow less than 3 grains 17 1 Hardness ppm 1 grain of hardness 1 Testing of water is always done AFTER water filter or water treatment used Water quality does change with usage and should be checked after idle times to see if the condition worsens 2 A carbon block filter system should always used to remove Chlorine and Chloramine If a water softener is used a carbon block is still required Check with your local water treatment specialist for proper sizing and replacement intervals for the carbon block cartridge 3 If the Chlorides exceed 30 ppm and the oven is used more than 8 hours during the day in steam or combination mode the cavity will require rinsing every 8 hours Failure to do so will result in corrosion and rusting of the oven cavity and interior parts A Reverse Os
56. ders CONTROL KNOB LIFT PANEL 3 PLACES PANEL SCREWS 6 PLACES HOOK 24951 4 PLACES Fig 34 3 Remove screws from back of control base panel 6 control panel up off hooks NOTE Carefully pull connector and ribbon cable through hole when removing control panel F45491 Rev A 1215 18 of 88 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS CONTROL BASE 1 7 Lem PANEL SCREWS 277 6 B COOLING 35 NOTE Use when removing back of control panel cover Wires are attached NOTICE Certain components in this system are subject to damage by electrostatic discharge during field repairs A field service grounding kit is required to prevent damage The field service kit must be used anytime the control board is handled 4 Unplug wires from back of On Off switch Fig 36 5 Using a pair of channel locks squeeze in the sides and press the switch out the front of the panel 6 Reverse procedures to install Check for proper operation Page 19 of 88 DISPLAY BOARD W SDA WARNING Disconnect the S electrical power to the machine and A follow lockout tagout procedures GS Ollow lOCKOU agout proce i components this system are subject to damage by electrostatic discharge during field repairs A field
57. ding kit Special 1 Combustion analyzer 2 socket head cap screw 3 long hardened black oxide finish for removing convection fan from motor shaft 3 Gear puller to remove CONVECTION FAN MOTOR 4 USB Drive Part 00 443444 LUBRICATION 1 Ovens have self lubricating composite bearings No lubrication required 2 Anti seizing compound WATER QUALITY STATEMENT The fact that a water supply is potable is no guarantee that it is suitable for steam generation Proper water quality can improve the taste of the food prepared in the oven reduce scale build up or corrosion and extend equipment life Local water conditions vary from one location to another and can change throughout the year The recommended water treatment for effective and efficient use of this equipment will vary depending on the local water conditions Your water supply must be within the general guidelines outlined in the chart below at all times during use of this machine or service issues not covered under warranty may result Water hardness should be treated by removing the impurities water softener with carbon block or dechlorinator and or in line water treatment Low water hardness may also require a water treatment system to reduce potential corrosion Water treatment has been shown to reduce costs associated with machine cleaning reduce deliming and reduce corrosion of metallic surfaces Daily washing and rinsing of the cavity is require
58. dule energizes the gas valve V1 10 Ignition Module sparks electrode for 1st trial ignition 11 Ignition Module detects flame and shuts off spark electrode A is not established after the spark period 1 2nd pre purge period 2 2nd spark B flame is not established after the 2nd spark period 1 3rd pre purge period 2 3rd spark is not established after the 3rd spark period the module will go into a lock out and the RED LED on the ignition module will blink and NO Heat will show in the Timer display on the oven D Main I O board detects the Ignition Module lock out and will reset the ignition module one time by de asserting and reasserting the call for heat Y 14 E The Ignition Module will repeat the ignition sequence up to 3 times again and if a flame is not detected after this second set of 3 tries the ignition module will lock out a second time the RED LED on the ignition module will blink NO HEAT will show in the timer display F Toresetthe Ignition Module turn the On Off SWA off and back on again 12 Ignition Module continues to energize the Gas valve and combustion blower 13 Ignition Module continues to monitor the flame sense Page 54 of 88 ABC Combi Gas Oven SEQUENCE OF OPERATION 14 Cavity temperature RTD1 monitored by Main I O board at XA1 amp 2 and turns off the call for heat when cavity temperature is satisfied Overshoot Feature A
59. e temperature of the oven In Service Mode 1963 Run F1 Convection Fan test Run F3 Convection Fan reverse test Run Y6 Cooling fans test 1 The Timer display alternates between CFan and a value A value of 99 means all three fans are running 2 Make sure cooling fan F3 is blowing in towards the convection fan motor With no power applied check to see if the convection fan turns freely Check to make sure there is restriction to air flow for cooling and no other heat source that would raise the temperature of the oven F45491 Rev 1215 ABC Combi Gas Oven DIAGNOSTICS TROUBLESHOOTING Error Oven does not operate When the error occurs the oven shuts down and E2 shows in the temperature 2 display along with a constant error beep Oven not operating properly Intermittent or erratic Uses too much water or does 2 not temper drain water F45491 Rev A 1215 1 RTD Probe Main board Cooling fan F2 not running or running in the wrong direction Drain tempering probe Water drain condensate valve Main board Page 80 of 88 In Service Mode 1963 A Run rd1 to check the reading from the temperature probe 1 Ifthe reading from the temperature probe reads zero degrees check the resistance of the temperature probe In Service Mode 1963 A Run Cooling fans test 1 The Timer display alternates between CFan and a value A value
60. ed in or out LOOSEN BY 1 4 TURN Remove wires 44 45 46 and 47 from the vent switches SWITCH 1 SWITCH 2 COMMON TERMINAL _ COMMON TERMINAL Wi TOCONNECTORP35 TO CONNECTOR P36 N O CONTACT ___ TO CONNECTOR P33 N C CONTACT NN y WIRE 44 SS TO CONNECTOR P3 1 WARE 78 N TO CONNECTOR P34 N C CONTACT 26767 Fig 98 Rotate the damper camshaft using a pair of channel locks until the indicator on the end of the camshaft is at diagonal as shown in figure 26786 F45491 Rev A 1215 ABC Combi Gas Oven SERVICE PROCEDURES AND ADJUSTMENTS 10 Reconnect wires to both vent switches 11 Reattach panels FLAME SENSE VOLTAGE TEST FENWAL SERIES 35 61 S this section require electrical test or Sus measurements while power is applied Ed to the machine Exercise extreme caution at all times and follow Arc Flash procedures If test points are not easily accessible disconnect power and follow Lockout Tagout procedures attach test equipment and reapply power to test NOTE The minimum flame voltage necessary to keep the system from lockout is 7 Volts 1 Connect a DC voltmeter FC FC terminals FLAME SENSOR VOLTAGE CHECK FENWAL SERIES 35 61 1 26786 MULTIPURPOSE METER Fig 99 5 Connect a meter set to check resistance to the common terminal and the N C contact of swit
61. ery 2 minutes during a cooking cycle NOTE The state of the on board reversing relay changes every two minutes as indicated by the green led This reverses the phases of the motor to reverse the direction of the motor 4 LED indicates the presence of current in the convection fan motor and signals the main board through the ribbon cable 5 The Solid State Relay R6 energizes 6 Convection Fan Motor Mtr1 energizes Ignition Module blower test relay R4 off 1 Y14 for heat relay energizes NOTE On the initial call for heat a software timer begins to measure call for heat s on time 2 Main board reads back the call for heat momentarily on XH2 as part of the Error checking routine 3 Main I O board monitors the NC fault output from the ignition module as part of the Error checking routine 4 24 VAC IM is supplied to the TH W thermostat input on the ignition module 5 Ignition Module checks pressure switch at PSW input for normally open contacts F45491 Rev A 1215 6 Ignition Module energizes IND output and the Combustion blower MTR3 energizes 7 Ignition Module checks pressure switch at PSW input for closed contacts NOTE Main momentary signal on Xh2 is now gone and the main board knows the pressure switch has been made 8 Ignition Module combustion blower pre purge delay begins and combustion blower removes residual gas from combustion chamber 9 Ignition Mo
62. ess and cable ties 4 Remove 4 nuts securing intake vent tube assembly to back of cavity Fig 54 5 Replace parts as needed 6 Reverse procedure to install NOTE There is a gasket between cavity intake tube and the cavity This gasket should be replaced F45491 Rev A 1215 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS CAVITY VENT MOTOR 4 S A A WARNING Disconnect the A electrical power to the machine and AS follow lockout tagout procedures 2 3 E 1 Remove Rear Panel 2 Remove CAVITY INTAKE TUBE ASSEMBLY Rotate damper camshaft until set screw faces the rear of the cavity intake tube assembly Jis W Fig 55 Loosen set screw Remove two screws securing the vent motor to the frame Pull motor free from assembly Insert blade of small screwdriver into wire nuts to release motor wires Fig 56 F45491 Rev A 1215 NOTE A small straight blade screwdriver Jeweler screwdriver is needed NOTE small screwdriver is not available cutting the wires and using a standard wire nut is acceptable 8 Reverse procedure to install NOTE When inserting the new motor insure the flat side of the motor shaft faces the set screw 9 Check CAVITY VENT SWITCH TEST AND ADJUSTMENT 10 Check for proper operation CAVITY VENT SWITCHES A WARNING Disconnect electrical power to the machine and follow lockout tagou
63. fixes an issue with custom temps feature in which initial lowest temp value when turning up from standby could be out of P15 16 range if the only enabled custom temps are above below P15 16 081114 08 11 14 P15 to 482F In Configuration Mode 1972 Increases the maximim temperature setting in Parameter NOTE Ovens with Serial Numbers prior to 541073334 must have their High Limit Thermostat changed before the setting of the maximum temperature can be set above 450F Starting Serial Number 541074335 FIRMWARE UPDATE PROCEDURE 1 Obtain copy of ABCombi bin file from the Hobart Service Resurce Center and load it onto a USB drive thumb drive NOTE The file must be loaded in the root directory of the thumb drive 2 Remove the RIGHT PANEL 3 power to the oven and insure that door is closed 4 Place the Oven in Idle Mode Temperature display A No Set Temperature B Notin Service Test Mode 1963 Not in Configuration Mode 1972 5 Insert the USB drive into the oven s USB A port Page 7 of 88 Fig 1 NOTE The Convection Fan Motor may or may not come on when the flash drive is inserted 6 View the LED displays on the front of the oven 7 Usb Fish n y appears the display If something other than Usb Flsh is displayed then refer to F45491 Rev A 1215 ABC Combi Gas Oven UPGRADE ABC COMBI FIRMWARE If n is selected with the
64. hat setting or humidity knob can be changed by the user SW9 input 2 Humidity knob sending signal from SW9 encoder to Main board through the ribbon cable for example 70 3 After Main board senses the cavity temperature on RTD1 is within 50 degrees of setpoint 4 8 Low humidity water valve 5012 energizes 5 Y5 High humidity water valve SOL3 energizes 6 Main I O board monitors SW5 Oven humidity oxygen sensor when humidity is satisfied NOTE All humidity setpoints between 0 and 10 are treated as 0 and all humidity setpoints between 90 and 100 are treated as 90 A 5 Humidity high water valve off Y8 Low humidity water valve off NOTE If the oxygen sensor is not functioning oven will enter a limp along mode and will steam in an inefficient open loop mode at setpoint between 212 and 220 F and or a humidity setpoint of 10096 Both water valves Y8 SOL2 amp Y5 SOL 3 energized continually without regulation Hysteresis Cavity vent intake motor during cook cycle 1 Main I O board monitor SW5 oven humidity oxygen sensor and compares it to humidity setpoint 2 10 energizes to open the vent until Main I O board detects SW1 SW2 open position when oxygen sensor SW5 gt setpoint 10 for example 80 3 Y10 de energizes to close the vent until Main 1 O board detects SW1 SW2 closed position when oxygen sensor SW5 lt setpoint for example 70 Automa
65. he following relays on the main board cavity vent motor high and low humidity valve condensate tempering valve cooling fans Optically coupled rotary encoder switch that is mounted behind the control knob and sends signal to display board as knob is turned in any direction Transformer with 120 VAC input Multiple secondary voltages are as follows 230 VAC to motor board and convection fan motor vent motor all water solenoids and cooling fans 12 VAC oxygen board and oxygen sensor 12 VAC cavity lamps 24 VAC main board motor board low voltage portion vent switches door switches high limit sensing contacts 24 VAC to ignition module and gas valves Incoming voltage supply connection Transformer to 230 VAC connections Convection Fan Motor MTR1 and Oven sensor RTD1 connection Page 49 of 88 F45491 Rev A 1215 Terminal Block Fuse 4 Fuse 7 Fuse 8 Oven Door Lights L1 L2 L3 eere Cavity Vent Motor 2 Cavity Vent Open SW1 Cavity Vent Closed 5 2 Humidity Valve Cavity Low Flow Sol2 Humidity Valve Cavity High Flow Sol3 Cooling Fans CF1 CF2 Convection Fan Motor Oven Sensor Input RT D1 Air Pressure Switch Spark Electrode Flame Sense Probe Cavity Gas Valve VInne Ignition Module Inducer Blower Motor
66. illuminates the Temp Time and humidity displays Y6 energizes the 3 cooling fans CF1 CF2 and CF3 Y9 energizes the cold water condensate Valve Sol 1 to fill the Ptrap for 6 seconds so cold air does not get sucked up into the cooking cavity through the drain Y10 Cavity Vent Intake motor Mtr2 energizes to close the vent if previously open Main board monitor SW1 SW2 for the closed position and de energizes Y 10 cavity vent intake motor Y13 energizes turning on the cavity lights F45491 Rev A 1215 ABC Combi Gas Oven SEQUENCE OF OPERATION ON OFF Switch SW4 ON amp with Call for Heat 1 Temperature knob turned to enter Temperature setpoint Sending signal from SW7 encoder to Main board through the ribbon cable for example 350 F NOTE All temperature setpoints between 212 F and 220 F are treated as 220 F NOTE Humidity knob automatically changes to the mapped humidity for that setting or humidity can be changed by the user SW9 input NOTE Timer SW8 input has no effect on the call for heat no timed cooking Motor Control Board 1 Main board sends controls signals through the ribbon cable to the motor board 2 Amber colored LED turns on to indicate that drive signal is being sent to the external solid state relay 3 Green colored LED indicates the direction of the motor and toggles its state from on to off or off to on ev
67. inoperative Error Codes In Service Mode 1963 A Run 56 Door test F45491 Rev A 1215 84 of 88 ABC Combi Gas Oven DIAGNOSTICS TROUBLESHOOTING SYMPTOM POSSIBLE CAUSE Oven operates Door closed and oven cavity lights inoperative Oven operates Door closed Oven convection fan operates Oven does not heat Possible error messages on Timer Display 1 No Heat 2 Door Oven cavity vent inoperative There is a dot in the upper left corner of the humidity display Reset control by powering oven off and unplugging from the wall outlet Then restarting Check fuse F2 In Service Mode 1963 A Run 713 Oven Cavity door light test 1 If all cavity light inoperative Check 12 volts from transformer Main Board 2 If only one light out Halogen light burned out In Service Mode 1963 A Check error log for E8 thru E13 errors NOTE Follow troubleshooting called out for the error found In Service Mode 1963 A Run 56 Door test Perform CAVITY VENT SWITCH TEST AND ADJUSTMENT Inspect the vent tube to make sure it is not blocked in someway Check water supply to unit In Service Mode 1963 A Run Y5 High Humidity test Run Y8 Low Humidity test Run S6 Door test Run 01 Oxygen sensor power test Run 03 Oxygen Board Oxygen sensor status test In Configuration Mode 1972 Check the setting of P28 if enabled in humidity display du
68. itical Error Probe RTD readings are out range ES E Future Use E4 Controls Compartment Ambient Error Operating temperature of controls has exceed recommenced temperature limits for more than 15 minutes extet Drain Tempering Probe Error Drain tempering probe readings are out of range of 32 F to 250 F range F45491 Rev A 1215 76 of 88 ABC Combi Gas Oven DIAGNOSTICS TROUBLESHOOTING Convection Fan Current Error Control board reads current convection fan motor when convection fan should be off Error E6 is the only error that can be logged during idle mode Bl pee Auto Electric or Gas Detection Error Control board cannot auto detect type of unit or state of auto detect pin has changed stance even oe Ignition Error Ignition Module Error Checking Problem 1 Ignition module inoperable 2 Improper sensing of X7 fault and XH2 pressure switch input to main board Oven may heat in this condition but Combi s Main board cannot sense ignition faults EO Ignition Error Ignition Module flame sensed before call for heat Pre ignition error Fenwal Module red light 2 flash E10 iR Ignition Error Ignition Module Lock Out Fault Pre ignition Failure to ignite gas after 3 sparks Fenwal Module red light 3 flash E11 cies Ignition Error Air flow fault 1
69. itored by the Main board Removes power to the motor control board when On Off switch is Off Is used to disable the call for heat signal from the main board to the ignition module when the On Off switch is Off Removes power to the oxygen board and sensor when the On Off switch is Off Used to disable the ignition module and to supply power to the combustion blower in the test mode Is used to report the condition of the High Limit Switch to Main Board Solid State Relay used to drive the convection fan motor Is controlled by the motor control board Passive electric component used to suppress high frequency noise from the oxygen sensor board ELECTRICAL PANEL COMPONENT LOCATION SSR OXYGEN SEN HIGH LIMIT 2 MOTOR BOARD 1 INDUCTION 2 MOTOR GAS PRESSURE SWITCH VALVE IGNITOR SENSOR Fig 103 51 88 45491 1215 6 F45491 Rev 1215 ABC Combi Gas Oven SEQUENCE OF OPERATION SEQUENCE OF OPERATION NOTE Refer to schematic diagram for the electrical sequence of operation Conditions Unit plugged into 120 VAC incoming power supply and is properly grounded ON OFF switch SW4 off Door switch closed SW3 High limit switch TS1 closed 120 VAC A 120 VAC to TB1 9C to 1 Blower test relay s COM contact 4 2 2 11 blower relay on ignition module 120 VAC Com to TB1 8A to 1
70. ized B Humidity high flow water valve SOL3 is energized C Humidity low flow water valve SOL2 is energized When the RDT1 temperature drops to within 70 of the temperature setting A Humidity high flow water 5013 is de energized B Humidity low flow water valve SOL2 is de energized ABC Combi Gas Oven CIRCUIT BOARD LAYOUTS CIRCUIT BOARD LAYOUTS MAIN BOARD CONNECTIONS Meter readings for different settings on unit NOTE Temperature knob presets to best set humidity However humidity can be adjusted DISPLAY BOARD RIBBON CABLE lt 85 28 om zc Dii PREP TC9 TC8 7 TC6 TC5 TC4 TC3 TC2 TCI MAIN BOARD CONDENSATE OXYGEN SENSOR DERIVED FROM 947551 sws Main Control Board Connections Oxygen Board Connections Function Wire number Designation connected 12 VAC OXY COM Wire harness connected to Oxygen sensor SW5 Oxygen Board voltage readings Designation Reference Point ON OFF Switch OFF ON OFF Switch ON MAIN BOARD CONNECTIONS FUNCTION Wire number Designation connected Ribbon Cable Ribbon cable connection for Motor Board Page 57 of 88 F45491 Rev A 1215 ABC Combi Gas Oven CIRCUIT BOARD LAYOUTS MAIN I O BOARD CONNECTIONS FUNCTION em connected 24 VAG COM 24 VAC IM input Call for heat relay supply voltage 24 VAC
71. kwise for positive offset to lower overall cavity Temperature calibration Temperature temperature Turn humidity knob counter Refer to TEMPERATURE oCAL clockwise for negative offset CALIBRATION in service and adjustment to raise overall cavity procedures temperature 15 thru 15 increments of 1 Default 0 Maximum drain discharge temp Gron 7120 thru 160 increments of 1 140 oVEn 0009 Hrs 999 Temperature at which to run cooling water into the drain drain on cooling water Page 39 of 88 2 45491 1215 ABC Combi Gas Oven SERVICE PROCEDURES AND ADJUSTMENTS Time Display Humidity Display Description Target maximum drain discharge temp Temperature at which to stop cooling water into the drain droF 115 thru 155 increments of 1 NOTE P25 and P26 are dependant on drain off cooling water tC1 130 each other The system will not allow them to be set closer than 5 Condensate tempering probe Enabled Tempering of drain water based on condensate probe temperature Energy efficient See P25 amp P26 415 Disabled Continuous time based tempering when in steam mode Less energy efficient Additional Humidity knob operator interface Enabled Customer has option to turn humidity knob below 0 to setpoint In this mode vent is forced closed and no humidity water valve operation 415 Disabled Humidity kn
72. l Board F45491 Rev A 1215 _ Page 8 of 88 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS REMOVAL AND REPLACEMENT OF PARTS PANELS FAN SCREWS REAR PANEL SCREWS WARNING Disconnect the electrical power to the machine and follow lockout tagout procedures Right Panel 1 2 Remove four right panel screws Lift right panel up and back using handles UTILITY RIGHT PANEL SCREWS SCREWS Fig 3 TERM 4 right side remove the screw the upper right hand corner PANEL HANDLES NTTTTITINI 24690 Fig 2 3 Reverse procedure to install Fig 4 1 Remove Right Panel NOTE as 5 Remove four rear panel screws 2 Remove two fan screws b NOTE Hold onto one panel handle to prevent rear 3 Remove six utility panel screws panel from falling NOTE Bottom 2 utility screws only support utility Lift with handles to remove panel and can be left assembled 7 Reverse procedure to install Left Panel 1 Remove Right Panel 2 Remove Rear Panel 3 On the left side remove the screw in the upper left hand corner 4 Lift left panel up and back towards the rear of the unit Page 9 of 88 F45491 Rev A 1215 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS Fig 5 5 Reverse procedure to install INNER DOOR 1 Open oven door 2 Unlatch inner door using inner door latch INNER DOOR
73. magnetic pull to the frame of oven 5 Slide transformer off of studs and down to the bottom of the oven Fig 80 6 Remove transformer and bracket from oven Remove nut and washer securing transformer to bracket Page 31 of 88 Fig 81 8 Replace transformer 9 Reverse procedure to install TEMPERATURE SENSOR RTD1 WARNING Disconnect electrical power to the machine and follow lockout tagout procedures 1 Remove Right Panel 2 Remove Rear Panel 3 Remove wire ties attaching wires going to temperature sensor to the oxygen sensor cable Fig 82 4 Remove black wire from TB2 3 and red wire from TB2 4 NOTE Insert small screwdriver in square next to the wire to release the wire from terminal block F45491 Rev A 1215 ABC Combi Gas Oven REMOVAL AND REPLACEMENT PARTS INSERT HEAD OF SCREWDRIVER TO RELEASE WIRE Fig 83 5 Push back installation to get access to the nuts securing the probe e 2 TEMPERATURE SENSOR RTD1 7 5 gt M Remove the two nuts Remove temperature sensor RTD1 from unit 6 7 8 Install new probe 9 Reverse procedure to install NOTE Attach wire ties in same spots as before DRAIN WATER CONDENSATE VALVE WARNING Disconnect the 3 SS electrical power to the machine and S follow lockout tagout procedures 1 Remove Right Panel 2 Remove Rear Panel F45491 Rev A 1215 Remove two screw
74. mer display 3 Checks breaking of motor Visually check for convection fan SPd loFF breaking to a stop and not coasting to a stop Convection Fan Reverse Test Turn humidity knob to initiate test Note direction of fan For example clockwise Turn humidity knob to reverse motor Note direction of fan has changed For example counter lon loFF clockwise NOTE Turning humidity knob too quickly during breaking sequence will cause oven to beep rEV F45491 Rev A 1215 70 of 88 ABC Combi Gas Oven DIAGNOSTICS TROUBLESHOOTING Temp Display Description Timer Display Humidity Display H2HI When on Timer display toggles between H2H1 and a value to Humidity High flow Water Valve indicate solenoid is energized When turned on water will flow Expected value 6 1 out of water atomizer NOTE Wait 10 seconds for NOTE Valve flow rate 15 proper value reading in timer liters hour 25 liter min display NOTE When Timer displays Err indicates that the valve is not drawing the proper current CFAn Current Sense value When on Timer display toggles between CFan and a value to Cooling fans indicate fans are energized Fan 1 control panel fan 2 Expected value approximately display panel fan 3 oven rear 99 for 3 fans 66 for 2 fans NOTE When Timer displays Err indicates that the fans are
75. mosis water treatment system can be installed to eliminate chlorides from the water and reduce the hardness Preventative washing and rinsing may be needed more than once a day to prevent compounding of contaminants inside cavity 4 Total Chlorine of 4 0 ppm is the max limit for the building water supply A carbon block filter must still be used to remove all Chlorine and Chloramines from the water Failure to do so will result in corrosion and rust in the cooking cavity which is not covered under warranty SPECIFICATIONS Data F45491 Rev A 1215 WARNING Appliances equipped with a flexible electric supply cord are provided with a three prong grounding plug It is imperative that this plug be connected into a properly grounded three prong receptacle If the receptacle is not the proper grounding type contact an electrician Do not remove grounding prong from this plug WARNING Electrical and grounding connections must comply with the applicable portions of the National Electrical Code and or other local electrical codes NOTE Do not use GFI outlets The spark ignition can cause electrical noise that can false trigger the GFI detection Supply Voltage m so amp 11 14 w c 80 000 Water Supply A cold water supply with a flow pressure of 30 to 60 psi is required There is a 3 4 garden hose fitting located on rear of machine labeled FILTERED This inlet must be connected to approved filte
76. n to left of inducer blower NOTE Retain insulation to reinstall after repairs 6 Insert 2x4 board between heat exchanger and bottom of cavity A HEAT EXCHANGER ASSY Fig 68 Remove air pressure hose Remove gas flue screws Remove gas flue from rear of unit Lift up and back to remove 50024 50 0 Remove inducer blower screws INDUCER GAS FLUE BLOWER SCREW SCREW au A 2 PLACES 4 PLACES ITA lt a Fig 70 7 Support gas valve burner assembly with a block of wood 1 24719 69 11 Pull to remove inducer blower 12 Remove any excess inducer blower seal before replacing seal 13 Reverse procedures to install 14 Check for proper operation Fig 71 8 Remove mounting plate nuts 9 Remove burner assembly nuts F45491 Rev 1215 Page 28 of 88 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS MOUNTING 4 Remove screws securing pressure switch 5 Reverse procedure to install IGNITION MODULE A WARNING Disconnect electrical power to the machine and follow lockout tagout procedures BURNER ASSY NUTS 2 PLACES 1 Remove Right Panel 2 Remove high voltage cable IGNITION MODULE 10 Pull to remove heat exchanger SCREW NOTE Check heat exchanger gasket for proper PLACES sealing 11 Replace heat exchanger gasket 12 Reverse procedure to install
77. nents in this system are subject to damage by electrostatic discharge during field repairs A field service grounding kit is required to prevent damage The field service kit must be used anytime the control board is handled Control Panel 1 Remove Right Panel 2 Disconnect multi pin connectors 3 Disconnect control board ribbon cable F45491 Rev A 1215 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS MOTOR CONTROL BOARD CONTROL BOARD 7 Place control panel on a clean flat surface RIBBON CABLE RIBBON CABLE 8 Place in a secure location NOTICE Do NOT place control panel flat on knobs Doing so will cause damage to encoders CONTROL KNOB LIFT PANEL __ 3 PLACES DIM 24951 CONTROL BOARD Fig 33 Fig 30 4 Remove ribbon cable wire tie 9 Reverse procedures to install NOTE The motor control board ribbon cable will fit in NOTE Replace wire tie on install J1 as well as J8 make sure it gets plugged in to J1 on RIBBON CABLE Main board WIRE TIE 10 Verify proper operation OFF SWITCH WARNING Disconnect electrical power to the machine and follow lockout tagout procedures On Off Switch Fig 31 1 Remove CONTROL PANEL from unit 2 Place control panel in a secure location on a clean flat surface 5 Remove 6 recessed control panel screws NOTE Do NOT place control panel flat on knobs Doing so will cause damage to enco
78. not drawing the proper current H2Lo When on Timer display toggles between H2Lo and a value to Humidity Low flow Water Valve indicate solenoid is energized When turned on water will flow Expected value 6 1 out of water atomizer NOTE Wait 10 seconds for on oFF NOTE Valve flow rate 15 proper value reading in timer liters hour 25 liter min display NOTE When Timer displays Err indicaes that the valve is not drawing the proper current H2dr Drain Temp When on Timer display toggles Water drain Condensate valve peer is the of the test value to When turned on water will flow indicate solenoid is energized out drain settles at a value of 6 1 and the oFF NOTE Valve flow rate 300 drain E Mt Y liters hour 5 liters min NOTE When Timer displays Err indicaes that the valve is not drawing the proper current Page 71 of 88 45491 1215 ABC Combi Gas Oven DIAGNOSTICS TROUBLESHOOTING Temp Display Description Cavity Vent Intake Current sense and Vent operation test 1 Checks state of vent switches 2 Checks rotation of vent motor quarter turn at a time NOTE Properly check cavity vent intake by turning humidity knob between oPn and CLS a minimum of 4 times to get full rotation 3 Times rotation of quarter turn to verify vent switches seat properly on shaft 4 Checks for current feedback to verify motor
79. ob choices set between 0 to 100 no Oxygen board calibrate zero Turning knob to yes indicates a multi step procedure Oxygen Sensor Data Shown in of Absolute Humidity This value will not match the Relative Humidity value shown on User Interface 51 at oven cavity temperatures lt 212 F NOTE Combine the two ONLY USED WHEN CALIBRATING numbers to get 51 2 OXYGEN SENSOR Refer to CALIBRATING OXYGEN SENSOR BOARD F45491 Rev A 1215 Page 40 of 88 ABC Combi Gas Oven SERVICE PROCEDURES AND ADJUSTMENTS Description Reset parameters to factory default values To reset values to factory default 1 Turn humidity knob clockwise to YES Timer display flashes Turn timer knob clockwise to spell rSET one letter at a time NOTE Humidity display will read don when the parameters have been reset NOTE This will reset P4 5 6 Custom settings Logging out of Configuration Mode 1972 1 Turn Temperature knob counterclockwise until displayed CALIBRATING OXYGEN SENSOR BOARD Oxygen sensor board needs to be calibrated when 1 Oven is installed 2 Main board is replaced 3 Oxygen sensor board is replaced 4 Oxygen sensor is replaced Preparation 1 Check oven temperature to insure that Oven temperature is below 100 F Open cavity door and keep open Towel dry cavity floor to ensure no standing water or steam in cavity NOTE May need
80. of 99 means all three fans are running Make sure cooling fan F2 is blowing down drawing air thru the electrical panel Check to make sure there is restriction to air flow for cooling and no other heat source that would raise the temperature of the oven In Service Mode 1963 A Run Y9 Water drain condensate valve test 1 When the test is running the Timer display toggles between three things H2dr which the name of the test the drain tempering probes temperature reading and a value that indicates the valve is energized should be a valve of 6 plus or minus 1 Not cooking properly Convection fan not working 2 1 A gas oven thinks it s electric 1 Main board IGNITION ERROR 1 ABC Combi Gas Oven DIAGNOSTICS TROUBLESHOOTING Error 1 Motor board Solid State relay 1 Wiring problem between main board and pressure Switch or pressure switch and Ignition module Ignition module s LED is on steady No Heat is displayed and there is a dot in the upper 2 left hand corner of the temperature display Pressure switch Ignition Module 4 Main board IGNITION ERROR 1 Ignition module s LED 2 flash Senses flame before call for heat Flame Sensor Gas Valve No Heat is displayed and board there is a dot in the upper left hand corner of the temperature display Page 81 of 88 In Service Mode 1963 A Run 1 Check LEDs on motor boa
81. ove encoder nut to remove encoder 7 Reverse procedures to install NOTE Tapped hole needs to be aligned with flat part of encoder 8 Check for proper operation HI LIMIT THERMOSTAT W Devs LA WARNING Disconnect the SS electrical power to the machine and S N follow lockout tagout procedures 4 1 Remove hi limit thermostat screws HI LIMIT THERMOSTAT PROBE EH AY A HI LIMIT THERMOSTAT SCREWS NOTE Gas Unit shown 2 Remove hi limit thermostat probe NOTE Hi limit thermostat probe is located on top of unit under insulation Page 22 of 88 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS NOTE Turn Probe Mounting Screw quarter turn to loosen Do not remove probe mounting screw and bracket TOP OF MOUNTING SCREW BACK OF UNIT 24950 Fig 51 3 Reverse procedures to install NOTE When installing hi limit thermostat verify hi limit shaft is turned clockwise until it stops P ZA Fig 52 4 Check for proper operation CAVITY INTAKE TUBE ASSEMBLY 7 S electrical power to the machine and follow lockout tagout procedures SAN A WARNING Disconnect S 2 1 Remove Rear Panel 2 Onright side of unit disconnect plug P3 Page 23 of 88 NOTE Gas Unit shown 3 Cut cable ties as needed to free wiring harness back to vent motor and switches NOTE Be sure to keep track of the routing of the wiring harn
82. ponent cooling Circulates air through the oven cavity Is driven by Motor Control Board through capacitor C1 Reverses direction at programed intervals Senses oven cavity temperature and is monitored by the Main board Monitors VACuum created by the draft inducer motor Prevents burner ignition if vacuum of 1 W C is not present Removes power from ignition module if oven overheats The state of the high limit is sensed by relay R5 which signals Vulcan Main l o board to display error code Ignites the gas Senses the presence of a flame Controls the gas flow Controls the inducer blower and gas valve Generates the spark for burner ignition monitors the pressure switch and the presence of a flame and controls the No ignition light When energized drives fan to generate draft required for proper oven operation and exhausts combustion products out of flue Admits water to p trap on power up to seal oven cavity And admits water ptrap to mix with drain water to cool drain discharge water to 140 F before exiting oven Page 50 of 88 Drain Water Sensor Input 1 Motor Interlock Relay R1 ioo Heat Interlock Relay R2 lox Oxygen Board Interlock Relay R3 Inducer Blower Relay High Limit Sense Relay R5 e Fan Motor Relay R6 2 5 Ferrite ABC Combi Gas Oven ELECTRICAL OPERATION Monitors drain water temperature and is mon
83. procedures to install 9 Check for proper operation F45491 Rev A 1215 CONTROL PANEL COOLING FAN ky WARNING Disconnect the xy S electrical power to the machine and follow lockout tagout procedures NOTICE Certain components in this system are subject to damage by electrostatic discharge during field repairs A field service grounding kit is required to prevent damage The field service kit must be used anytime the control board is handled Display Board Fan 1 Remove CONTROL PANEL from unit 2 control panel in a secure location NOTE Do NOT place control panel flat on knobs Doing so will cause damage to encoders CONTROL KNOB LIFT PANEL 3 PLACES 24951 Fig 41 3 Remove screws from back of control base panel CONTROL BASE 7 2 PANEL SCREWS 6 PLACES 2 COOLING Fig 42 4 Disconnect cooling fan wire connection 5 Remove cooling fan nuts Page 20 of 88 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS COOLING FAN NUTS x4 COOLING FAN WIRE 7 CONNECTION 7 Fig 43 6 When installing fan verify arrows are facing the correct direction 24703 NOTE Air to exhaust out of control panel Fig 44 7 Reverse procedure to install 8 Check for proper operation CONTROL BOX COOLING FAN A WARNING Disconnect electrical power to the machine and follow lockout tagout procedures
84. r system Failure to connect oven to approved filter system will void warranty There is also a 3 4 garden hose fitting located on rear of machine labeled NON FILTER Plumbing Connections WARNING Plumbing connections must comply with the applicable sanitary safety and plumbing codes Drain Connection The drain connection must be plumbed with a minimum of 1 air gap Drain water can not be greater than 140 F upon discharge There is 1 NPT male port for drain Drain plumbing not supplied should have a constant slope towards floor drain Do not connect solidly to floor or other drains Page 6 of 88 ABC Combi Gas Oven UPGRADE ABC COMBI FIRMWARE UPGRADE ABC COMBI FIRMWARE FIRMWARE VERSION HISTORY This section contains the history of the ABC7 Combi Oven Firmware The release date of the Firmware is how it is identified The table below will list the release date along with a short explanation of the features fixes which were introduced with that particular version NOTE The current version of firmware loaded in to the oven can be identifiied in Service Mode 1963 location PO Firmware Version Comments Release Date 022514 02 25 14 First production release Fixed an issue with the E6 error Motor current sense circuit would lock up and the oven could not sense current going to the convection fan motor causing an E6 error Fixed an issue with the P4 P5 and P6 custom temperature settings It
85. rd If red LED is on when the motor is not running replace motor board 1 Convection Fan test If yellow LED is on and motor does not run replace Solid State Relay In Service Mode 1963 A Run 511 Auto Detect test In Service Mode 1963 A Run 717 Ignition sequence test to see if burner lites If the burner lites check wiring If burner does not lite check LED on Ignition module a If LED is steady on replace Ignition module In Service Mode 1963 A Run 717 Ignition sequence test to see if burner lites If the burner lites make sure flame goes out when test is turned off If operation appears normal but another E9 error comes up check flame sensor F45491 Rev A 1215 ABC Combi Gas Oven DIAGNOSTICS TROUBLESHOOTING Error IGNITION ERROR 1 Ignition module s LED flash Fails to ignite or fails to sense flame No Heat is displayed and there is a dot in the upper left hand corner of the temperature display IGNITION ERROR 1 Ignition module s LED 1 flash Pressure switch never makes No Heat is displayed and there is a dot in the upper left hand corner of the temperature display IGNITION ERROR 1 Ignition module s LED is on steady Control Fault Ignition module s LED 1 flash Pressure switch drops out No Heat is displayed and there is a dot in the upper left hand corner of the temperature display IGNITION ERROR 1 Ignition mod
86. ring operation means steam is turned off Inadequate oven preheat Oven must be within 50 of setpoint for steam Page 85 of 88 F45491 Rev A 1215 ABC Combi Gas Oven DIAGNOSTICS TROUBLESHOOTING SYMPTOM POSSIBLE CAUSE In Service Mode 1963 A 5 High Humidity test un 8 Low Humidity test un 10 Cavity vent intake test Excessive moisture in oven or not enough Run 01 Oxygen sensor power test moisture in oven Run o3 Oxygen Board Sensor status test Run 04 Oxygen Sensor data test Perform CALIBRATING OXYGEN SENSOR BOARD Drain clogged or plumbed incorrectly Water pressure regulator malfunction In configuration Mode 1972 A Check the settings P1 and P24 See CONFIGURATION MODE 1972 for details Perform TEMPERATURE CALIBRATION 3 Service Mode 1963 A Y5 High Humidity test Y8 Low Humidity test Incorrect heat Oven temperature does not B un match setpoint C Run F1 Convection Fan test D Run 56 Door test E Run Y17 lgnition Sequence test Check rate of raise 4 Perform DRAFT INDUCER TEST 5 Heating circuit malfunction NOTE Remember that the Overshoot feature engages during the first call for heat and will overshoot the setpoint temporarily In Service Mode 1963 A F1 Convection Fan test B Run Convection Fan reverse test C 10 Cavity vent intake test Uneven Baking Check
87. rom replaced board Power on unit CALIBRATING OXYGEN SENSOR BOARD Check for proper operation FERRITE Ww WARNING Disconnect v at 45 s SS electrical power to the machine and follow lockout tagout procedures fy 1 Remove Right Panel 2 ferrite clip with flat screw driver 2 places 3 Reverse procedures to install Page 16 of 88 ABC Combi Gas Oven REMOVAL AND REPLACEMENT PARTS NOTE When installing place ferrite approximately 3 inches from oxygen sensor board NOTE Loop ferrite wires around the ferrite to keep ferrite in place x Disconnect the electrical power to the machine and follow lockout tagout procedures Certain components in this system are subject to damage by electrostatic discharge during field repairs A field service grounding kit is required to prevent damage The field service kit must be used anytime the control board is handled 1 Remove Right Panel 2 Document wire locations 3 Remove electrical connections from board 4 Remove motor control board 4 Nylon screws Page 17 of 88 FUSE F7 Nee ANY 4942 Fig 29 5 Replace motor control board 6 Reverse procedure to install Check for proper operation CONTROL PANEL A WARNING Disconnect electrical power to the machine and follow lockout tagout procedures Certain compo
88. rror E1 happened at hour 75 4 This means the error occurred 4 working days earlier Page 78 of 88 ABC Combi Gas Oven DIAGNOSTICS TROUBLESHOOTING Oven does not operate When the error occurs the oven shuts down 0 shows in the temperature display along with a constant error beep Oven does not operate When the error occurs the oven shuts down and E1 shows in the temperature display along with a constant error beep High limit thermostat open High limit sensing relay R5 Oven installed with not enough clearance Fuse F4 Convection fan motor is getting too hot and it s thermal overload trips 6 25 amp fuse F7 blows on the Motor Drive Board Cooling fan F3 not running or running in the wrong direction R1 interlock relay r6 solid state relay Motor Drive board C1 capacitor Page 79 of 88 Error Verify High limit shaft is turned clockwise until it stops In Service Mode 1963 A Run 55 to check the current status of the high limit B Run rd1 to check the current temp of the oven cavity In Configuration Mode 1972 A Check the setting of P15 1 Ifthe setting of P15 is set to 482 the high limit must be the 582 degree high limit thermostat NOTE The older version of the high limit thermostat had yellow painted on the tip of the shaft Check to make sure there is restriction to air flow for cooling and no other heat source that would raise th
89. s Cooking hours are the number of hours the oven has been in use Cooking hours do not increase during idle time all displays show So if a school uses an oven 6 hours a day 5 days a week The cooking hours will increase 30 hours a week F45491 Rev A 1215 74 of 88 ABC Combi Gas Oven DIAGNOSTICS TROUBLESHOOTING Log Into Service Mode 1963 1 2 3 Turn unit on Turn Timer knob counterclockwise until Timer display shows SEt Turn Humidity knob counterclockwise until Humidity display shows PAS A Timer display will show 2000 Turn Timer display counterclockwise to 1963 A Timer display will flash 1963 B Timer and Humidity display will flash twice C Humidity display changes from PAs to tst when logging into Service Mode Turn Temperature knob clockwise through all tests in service mode until HRS is displayed the Temperature display This displays the current number of cooking hours in the Timer and Humidity displays Make a note of the hour listed This is important so that you can tell how long it has been since the error has occurred To read the current number of hours A With HRS displayed in the temperature display B 0009 in the Timer display C 999 in the humidity display D The oven would have 9 999 cooking hours Turn Timer knob clockwise one more click and LOg is displayed in the Temperature display Page 75 88 F45491 Rev A 12
90. s securing valve to utility panel Fig 85 NOTE Gas Unit shown 4 6 7 Remove two wires going to valve Loosen hose clamp and pull valve free of hose Fig 86 Replace valve Reverse procedure to install DRAIN WATER THERMOCOUPLE WARNING Disconnect electrical power to the machine and follow lockout tagout procedures Remove Right Panel Loosen screws for terminal TC1 and remove wires Page 32 of 88 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS 7 Reverse procedure to install HUMIDITY VALVE A WARNING Disconnect the electrical power to the machine and follow lockout tagout procedures 1 Remove Right Panel 2 Remove Rear Panel 3 Remove two screws securing humidity valve to utility panel 3 Cut cable ties securing wires going to drain water thermocouple 4 Loosen nut securing the thermocouple 90 NOTE Gas Unit shown NOTE The humidity valve is a double valve E NUT 26810 88 4 Remove two wires going to drain water condensate valve 5 thermocouple from housing NOTE This makes it easier to pull the humidity valve THERMOCOUPLE out behind the utility panel 5 Remove the four wires going to humidity valve NOTE Make sure to note which wire goes to which terminal Fig 89 6 Replace thermocouple Page 30188 F45491 Rev A 1215 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF P
91. sert spare M6 cap screw into convection fan motor shaft Hand tighten only F45491 Rev A 1215 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS LEFT HAND THREAD GROOVE IN CONVECTION FAN 11 Install gear puller 12 Tighten gear puller to separate convection fan from the motor shaft NOTE Applying heat uniformly to groove in convection fan will assist with separation of convection fan and motor shaft 13 Disconnect motor wires from convection fan terminal block Convection Fan Terminal Block TB2 Connection Call outs 14 Remove convection motor shroud bolts Refer to graphic 24710 Convection Fan Motor NOTE Apply anti seizing compound to bolts 15 Reverse procedure to install 16 Check for proper operation CONVECTION FAN BAFFLE The oven and its parts are hot Use care when operating cleaning or servicing the oven 1 Remove all oven racks 2 Remove left and right oven rack holders 3 Lift baffle up off bottom baffle supports 4 Lift baffle over bottom rack guides F45491 Rev A 1215 5 Lift baffle up off baffle hangers NOTE Verify convection fan baffle is lifted over bottom and top rack guide supports CONVECTION FAN BAFFLE RACK GUIDES Fig 21 6 Pull towards front of oven to remove 7 Reverse procedures to install NOTE Verify convection fan baffle is hooked on top baffle hangers and supported behind the bottom baffle support guides
92. t procedures 3 Remove bottom screw securing switches to frame Page 24 of 88 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS Fig 58 4 Loosen top screw and remove switches from frame Replace switch or switches as needed Reverse procedure to install Attach wires to switches SWITCH 1 SWITCH 2 COMMON TERMINAL COMMON TERMINAL WIRE 246 TO CONNECTORP3 5 V TO CONNECTOR P3 6 CONTACT p 0 TO CONECI RESA MI WA Ne CONTACT N O CONTACT WIRE 877 TO CONNECTOR P3 3 _ N C CONTACT WARE 44 TO CONNECTOR 3 1 by CONNECT ORP32 26767 Fig 59 8 Perform CAVITY VENT SWITCH TEST AND ADJUSTMENT GAS VALVE WARNING Disconnect electrical power to the machine and follow lockout tagout procedures Certain components in this system are subject to damage by electrostatic discharge during field repairs A field service grounding kit is required to prevent damage The field service kit must be used anytime the control board is handled 1 Remove Right Panel 2 Remove wires from gas valve Page 25 of 88 3 Remove gas line from gas valve 4 Remove high voltage ignitor cable from ignitor 5 Remove flame sensor wire from flame sensor 6 Remove manifold screws from burner 7 Remove gas valve from manifold GAS VALVE HIGH VOLTAGE GAS LINE
93. tall Check proper operation Page 12 of 88 ABC Combi Gas Oven REMOVAL AND REPLACEMENT OF PARTS CONVECTION FAN MOTOR Certain components in this system are subject to damage by electrostatic discharge during field repairs A field service grounding kit is required to prevent damage The field service kit must be used anytime the control board is handled A WARNING Disconnect the electrical power to the machine and follow lockout tagout procedures NOTE When using gear puller to remove convection fan do not use factory stainless steel cap screw or damage to the screw head may occur Use a spare M6 cap screw as listed under Tools Convection Fan 1 Remove Right Panel 2 Remove Rear Panel 3 Remove humidity hose clamp TERMINAL BLOCK Convection Fan Motor Remove CONVECTION FAN BAFFLE Remove humidity cavity nozzle nuts to remove humidity cavity nozzle NOTE Replace nozzle gasket if necessary Page 13 of 88 HUMIDITY CAVITY NOZZLE Fig 18 NOTE Gas Unit shown 6 Remove socket head cap screw SOCKET HEAD CAP SCREW Fig 19 NOTE Gas Unit shown 7 Remove atomizer bolt NOTE Atomizer bolt is a left handed bolt Turn clockwise to remove 8 Remove water atomizer 9 Thread atomizer bolt by hand into convection fan motor shaft Leave approximately 1 8 space between hex head on left hand thread atomizer bolt and convection fan hub 10 In
94. tic Venting 1 When Timer counts down to 30 seconds defined in P17 then the vent will be opened to release steam in the cavity prior to the presumed opening of the door when the timer expires Y5 Humidity high water valve off Y8 Low humidity water valve off Y10 Cavity Vent Intake motor MTR2 energizes F45491 Rev A 1215 ABC Combi Gas Oven SEQUENCE OF OPERATION Main I O board monitors SW1 SW2 for the open position and de energizes Y10 cavity vent intake motor OTHER SEQUENCES Timer expires 1 Timer sends a signal from SW8 encoder to Main board through the ribbon cable for example 01 15 is 1 hour 15 minutes Main board energized the on board buzzer for 5 seconds or continuously if so programmed in configuration mode parameter P8 The time function does not control or affect the heating so the oven will continue to heat after timer expires Humidity function not re enabled until the timer is reset and or the door is opened and closed Door Open SW3 open 1 2 3 Y14 call for heat low is off Y5 Humidity high water valve off Y8 Low humidity water valve off NOTE Atany time in the operation if door is opened the Cook timer pauses Electronic Motor Break A Main board sends controls signals through the ribbon cable to the motor board B AMBER L1 and RED L3 LEDs turn off The Solid State Relay R6 de energizes D Green colored LED L2 indicates the
95. to manual adjust humidity HAdJ on settings during operation Oven Buzzer ON Buzzer stops after 5 seconds 55 OFF Buzzer turns until door is opened or timer is turned off Door Lights ON Door lights flash at end of timer countdown FLSH on oFF OFF Door lights do not flash at end of countdown Page 37 of 88 F45491 Rev A 1215 ABC Combi Gas Oven SERVICE PROCEDURES AND ADJUSTMENTS Time 2 Description Batch Timer Timer recalls last operated value when door is open and closed after buzzer User does not need to reset timer trCL on oFF For example User removes a batch of fries from oven and puts in a second batch Clean reminder good bYE shown when on off switch is toggled off Convection Fan Speed not adjustable Fan Speed Convection Fan Speed not adjustable adjustable Convection Fan Breaking Speed not P13 adjustable Reversing fan timing Number of minutes cavity fan turns before Off 1 2 3 4 5 breaking and turning in opposite direction Define maximum temperature knob setting in 80 thru 450 increments of 10 Maximum temperature that can be set by user Minimum setting limited by P16 Define minimum temperature knob setting in Ul Minimum temperature that can be set by user Maximum setting limited by P15 80 thru 450 increments of 10 NOTE Must be less than P15 NOTE Settings at P15 and P16 are onl
96. tr acinomae Ree 5 ci 42 SAS 5 12 6 150 zi Ee 218 215 c NRE 2 TRANSFORMER 3 2 GRND SCREW CHASSIS DERIVED FROM 947551 AI3671 Fig 107 Page 63 01 84 F45491 Rev 1215 5 7 ENCODER 2 swe ENCODER Swe ABC Combi Gas Oven WIRING DIAGRAMS MAIN BOARD VULCAN DISPLAY BOARD BOARD MAIN BOARD RIBBON CABLE SEE MOTOR BOARD DETAIL 1 RTD1 OVEN SENSOR WIRES SUPPLIED WITH DEVICE TC1 DRAIN WATER FROM TRANSFORMER SECONDARY VAC 12V 20V BLUMHT ve 145 153 151 149 147 ENCODER 2 F1 4A FUSE LINK 184 20 TB4 19 L o LALO F2 4A FUSE LINK 85 2WAY JUMPER F4 4A FUSE LINK 48 49 50 FERRITE 1 COIL WIRES 42 amp 43 R3 1 HH NO SWITCHES SHOWN IN VENT CLOSED POSITION SW1 CAVITY VENT 6 46 E 35 gt 33 SW2 CAVITY VENT 45 2 78 3 2 5 7 R5 1 SW3 DOOR SWITCH 52 51 1 3 P1 6 SWITCH SHOWN IN DOOR CLOSED POSITION ARD SENSOR POWER SUPPLY FUSE F8 FERRITE 1 FROM TRANSFORMER SECONDARY VAC 1V 24V OXY LITE VENT 1 299 REF R32 Je 148 faso 127 Lo FH L 43 I TO GRN
97. ule s LED is off left hand corner of the temperature display Poor cooking Error dot in the humidity display F45491 Rev A 1215 No Heat is displayed and 2 there is a dot in the 3 upper left hand corner of the 2 Gas supply to oven not on Oven s internal gas valve turned off Oven s internal gas valve not operating properly Air in gas supply line Spark ignitor Flame Sensor Ignition module Pressure switch Draft inducer motor Ignition module Pressure switch Draft inducer motor Ignition module Gas Supply problem Flame Sensor Ignition module Vent motor Vent switches Vent blocked Page 82 of 88 Check gas supply to oven Check switch at internal gas valve In Service Mode 1963 A 17 Ignition sequence test to see if burner lites 1 If burner lites Flame sensor 2 If burner does not lite Spark ignitor Gas valve Ignition module If the ignition module s LED is doing a 1 flash A Dothe DRAFT INDUCER TEST If the ignition module s LED is doing a 1 flash A Dothe DRAFT INDUCER TEST Run Y17 Ignition sequence test to see if burner lites A If burner does not lite check LED on Ignition module 1 IfLED is steady on replace Ignition module Check Gas supply Run Y17 Ignition sequence test to see if burner lites A Ifthe burner lites check flame sensor If burner does not lite check
98. ur counter does not increment in idle mode LOg Refer to ERROR CODES Page 73 of 88 2 45491 1215 ABC Combi Gas Oven DIAGNOSTICS TROUBLESHOOTING Logging out of Service Mode 1963 1 Temperature knob counterclockwise until displayed ERROR CODES In cook mode the oven always checks for errors The oven does not check for errors in idle mode all displays show All errors are stored into a log in SERVICE MODE 1963 Some errors are considered critical that the oven cannot operate and if detected everything is shut down and error number is displayed and oven beeps continually NOTE E6 error is the exception to the rule and is the only error logged during idle time To turn off continuous beep toggle on off switch If condition still exist error will reappear immediately If error beep turns back on turn Timer knob counter clockwise back to idle mode NOTICE ERRORS 0 2 below are critical errors Oven will not function in this condition All processes stopped and oven is shut down Some errors are considered non critical where something requires service but oven can still cook Some of these errors are displayed in operator interface so customer knows to call for service Other non critical errors are logged as a diagnostics tool for service When an error code is logged the hour that the error occurred is recorded The hours in the log are cooking hour
99. uture Use 8 In cook mode where oxygen sensor board has lost 12 supply E19 Future Use E20 Cooling Fan Dropout Current not sensed in one or more of the cooling fans Check cooling fans to ensure fans are functioning properly E21 ME Motor Board AC Power Frequency Check Error triggers if 60 Hertz is not detected by motor board Logging out of Service Mode 1963 1 Turn Temperature knob counterclockwise until displayed OVEN TROUBLESHOOTING Quick over all check The ABC7 Combi oven automatically records error conditions that may occur during use Also the Service Mode provides a quick way of checking the condition of the oven It is recommended that any time an 7 oven is to be serviced the service tech starts by running the all the test in SERVICE MODE 1963 and to look at the in the error log to make note of any recent error codes that have been saved Troubleshooting using Error Codes Check which ERROR CODES are logged NOTE When an error has been corrected that error code still remains in the log Itis important to note what F45491 Rev A 1215 the current cooking hour is and what cooking hour the error code was recorded Example 1 The current number of cooking hours on the oven is 100 NOTE Temperature display shows HRS Timer display is flashing 0000 and the humidity display is flashing 100 2 school uses the oven 6 hours a day 3 E
100. y in effect if P4 is set to FACt Cavity Automatic Steam Reduction Reduces the cavity s steam build up before end of timed cook Vent intake is opened selected seconds before end of timer countdown NOTE Steam reduction is not engaged AUto oFF 30 60 90 mid cook or during a non timed cook when door opened Example P17 30 seconds default As the cook time counts down the vent opens allowing the steam to dissipate F45491 Rev A 1215 Page 38 of 88 ABC Combi Gas Oven SERVICE PROCEDURES AND ADJUSTMENTS Time Display Humidity Display Description Oven hour counter Total hours oven has been cooking Example Timer 0009 Humidity 999 9 999 hours NOTE Counters will zero when Main I O board is replaced Humidity water counter Total amount of water used to humidity oven in gallons Example Timer 0009 Humidity 999 9 999 gallons HUn 0009 gAL 999 NOTE Counters will zero when Main I O board is replaced NOTE Add P19 amp P20 for total water usage Condensate tempering water counter Total amount of water used to cool drain water in gallons NOTE Counters will zero when Main I O Cond 000 gAL 00 board is replaced NOTE Add P19 amp P20 for total water usage Demo Mode Used for sales All functions operable except for heat dEno on Disables critical errors NOTE Display will show ABC trY it after on off switch is turned off Turn humidity knob cloc

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