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SERVICE MANUAL

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1. Motor Interlock R1 B Interlock relay R1 1 Common Contact Cold Water Condensate SOL1 Humidity Valve Cavity Low Flow SOL2 Humidity Valve Cavity Hi Flow SOL3 Cooling Fans CF1 CF2 CF3 10 V4 Main Board call fro heat common 24 24 VAC from transformer to 4 16 through 4A fuse F3 to 1 Cavity Vent Switch SW1 COM Cavity Vent Switch SW2 COM Door Switch SW3 N V9 connection on Main Board P21 connection on Motor Control Reversing Board Hi Limit sensing K1 auxiliary Contact COM ABC Combi Electric Oven SEQUENCE OF OPERATION B 24 Com from transformer to 4 5 and 4 6 to 1 P22 connection on Motor Control Reversing Board 2 V8 connection on Main Board 12 VAC oxy A 12 VAC oxy from transformer to 4 through 4A fuse 1 to 1 Oxygen board interlock relay COM contact R3 1 B 12VAC oxy COM from transformer to TB4 to 1 Oxygen board interlock relay COM contact R3 2 12 VAC lite A 12 VAC from transformer to 4 through 4A fuse F2 to 1 V3 Lamp on Main board B 12VAC lite COM from transformer to TB4 to 1 Cavity lights Lamps L1 L2 L3 COM ON OFF Switch SW4 turned ON No Call for Heat Motor Interlock relay coil R1 energizes A Provides 230 VAC across 1 wire 106 and
2. F45495 Rev B 0515 ABC Combi Electric 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 46 TO CONNECTORP3 5 c VC TO CONNECTOR P3 6 CONNECTOR P3 1 EOR 26767 Fig 59 8 Perform CAVITY VENT SWITCH TEST AND ADJUSTMENT TRANSFORMER 4 ky A WARNING Disconnect the electrical power to the machine and AS follow lockout tagout procedures 1 Remove Right Panel 2 Disconnect Plugs 7 and 8 going to Transformer F45495 Rev B 0515 3 Page 26 of 77 Remove two nuts on the left hand side of transformer bracket Remove nut on the right hand side of transformer bracket ABC Combi Electric Oven REMOVAL AND REPLACEMENT OF PARTS CAUTION Transformer weighs 12 5 pounds and has a strong magnetic pull to the frame of oven 5 Slide transformer off of studs and down to the bottom of the oven Fig 63 6 Remove transformer and bracket from oven 7 Remove nut and washer securing transformer to bracket 8 Replace transformer 9 Reverse procedure to install TEMPERATURE SENSOR RTD1 n DR WARNING Disconnect the S electrical power to the machine and follow lockout tagout proced
3. Cold Water Condensate SOL1 Drain Water Sensor Input TC1 Motor Interlock Relay rue Heat Interlock Relay 2 Contactor K1 F45495 Rev B 0515 ABC Combi Electric Oven ELECTRICAL OPERATION Incoming voltage supply line 480 240 or 208 to contactors K1 K2 K3 K4 and to fuses F5 and F6 Configure for either 3 Phase or single phase Low voltage outputs from transformer connection 4A Protects 12 VAC oven Oxygen Sensor Board circuit 4A Protects 12 VAC oven Cavity Light circuit 4A Protects 24 VAC Main Board Motor Board Vent Switches Door Switches High Limit Sensing Contacts 20A fuse to transformer primary 20A fuse to transformer primary Common 6 25A fuse motor current protection fuse F7 protects from a malfunction of the motor control boards on board reversing relay fuse Protects Oxygen Sensor Board Mounted on Oxygen Sensor 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 vapo
4. FUSED 12 148 12 1 2 ____ 48 2 2 27 TERMINAL BLOCKS NAL BLOCK TB1 B B C D WIRE 342 CONNECTED FOR CUSTOMER VOLTAGE AT FACTORY 19 3 2 1 ae Fig 90 Page 55 of 77 TERMINAL BLOCK TB3 309 314 312 306 311 315 307 308 313 304 305 310 LINE IN INSTALLED IN FIELD FUSE SERVICES FUSE LINKIN 7 HEATSHRINKF OXYGEN BOARD FUSE LINK IN HEAT SHRINK F2 CAVITY LIGHTS FUSE LINKIN VENT amp DOOR SW 5 HEATSHRINKF3 HI LIMIT SENSE MOTOR BD 13680 45495 Rev B 0515 ABC Combi Electric Oven WIRING DIAGRAMS T1 TRANSFORMER ACI CONTACTOR DIAGRAM 50 341 4 PES 333 306 RELAY DIAGRAM 339 332 XE 8 335 34 lt E 334 x 301 309 308 307 VAC VAC TB1 480V 6 Fere NM 40 77 480V S YELWHT 230V Pe 1815 030 common TB1 240V 141 RED BRN ji MT 27900 tavoxy 1 BLU RT 12V LITE PB 7849 12V LITE COMMON 150 184 16 24V VENT 24V VENT COMMON 152 BA 24V IM 4 1 24V IM COMMON COMMON 14 ORN B DERIVED FROM 947552 AI3681 151 Fig 91 F45495 Rev B 0515 56 of 77 ABC Com
5. tants TEMPERATURE SENSOR RTD1 2 2 4 2 27 2 2 2 DRAIN WATER CONDENSATE VALVE 2 2 2 2 2 2 2 2 DRAIN WATER THERMOCOUPLE 2 2 2 4 1 2 2 4 22 2825 sed bat sd HEATING ELEMENTS i t etudes qtd edet dabas ehe aes eua CONTACTORS tona tdeo e Lose o netu s der ud SERVICE PROCEDURES AND ADJUSTMENTS III eer n CONFIGURATION MODE 1972 2 4 3 1 1 2 2 22 222 2 22 LOG INTO CONFIGURATION MODE 1972 4 2 4 TO REVIEW CHANGE CONFIGURATION MODE 1972 SETTINGS LOGGING OUT OF CONFIGURATION MODE 1972 2 CALIBRATING OXYGEN SENSOR BOARD 4 2 2 2 27 2 TEMPERATURE SENSOR RTD1 TEST 2 TEMPERATURE CALIBRATION 2 2 22 22222 F45495 Rev 0515 2 077 ABC Combi Electric Oven CAVITY VENT SWITCH TEST AND ADJUSTMENT 2 2 2 2 40 DOOR S
6. 2 Page 28 of 77 ABC Combi Electric Oven REMOVAL AND REPLACEMENT OF PARTS Hh NUT Fig 74 5 Pull thermocouple from housing THERMOCOUPLE 26810 h Pm y 126811 Fig 72 6 Replace thermocouple 7 Reverse procedure to install HUMIDITY VALVE electrical power to the machine and follow lockout tagout procedures 1 Remove Right Panel 2 Remove Rear Panel Remove two screws securing humidity valve to utility panel Page 29 of 77 Fig 73 NOTE Gas Unit shown NOTE The humidity valve is a double valve 4 Remove two wires going to drain water condensate valve NOTE This makes it easier to pull the humidity valve out from 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 74 6 Loosen the two hose clamps securing the valve and free the valve from the two hoses F45495 Rev B 0515 ABC Combi Electric Oven REMOVAL AND REPLACEMENT OF PARTS Fig 75 7 Replace valve 8 Reverse procedure to install HEATING ELEMENTS WARNING Disconnect the electrical power to the machine and follow lockout tagout procedures 1 Remove Wire Rackets 2 Remove Fan Cavity Baffle 3 Remove Right Panel 4 Remove Rear Panel 5 Remove REAR COOLING FAN NOTE The rear fan is attached to a bundle of wires itis OK to let the fan hang from the wire tie for
7. E16 5e In cook mode where oxygen sensor oxygen sensor board has fallen out of its ready status 1 Stuck in warming 2 Communication error 3 Internal oxygen board heating or calibration error Lin Future Use E19 oe EIS In cook mode where oxygen sensor board has lost 12V supply 19 Future Use 20 is Cooling Fan Dropout Current not sensed in one or more of the cooling fans Check cooling fans to ensure fans are functioning properly EU 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 Link to error codes section are logged NOTE When an error has been corrected that error code still remains in the log Itis important to note what F45495 Rev B 0515 the current cooking hour is and what cooking hour the error code was recorded Example
8. 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 Error happened at hour 75 4 This means the error occurred 4 working days earlier Page 70 of 77 ABC Combi Electric Oven DIAGNOSTICS TROUBLESHOOTING Oven does not operate When the error occurs the oven shuts down and 2 shows in the temperature display along with a constant error beep Oven does not operate 2 When the error occurs the oven shuts down and 3 E1 shows in the temperature display along with a constant error beep Oven does not operate When the error occurs the oven shuts down and 1 E2 shows in the temperature display along with a constant error beep High limit thermostat open K1 Contactor Aux contacts Oven installed with not enough clearance 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 RTD Probe Main board Page 71 of 77 Verify High limit shaft is turned clockwise until it stops Service Mode 1963 A Run 55 to check the current status of the high limit B Run rd1 to check the curr
9. 12 for 480 VAC 6 Fuse to 1 8 6 Supply Voltage to Transformer T1 TB1 10 or 11 or 12 and TB1 8 for correct oven voltage on primary input of T1 5 A Transformer step up from or down from the Supply Voltage to 230 VAC providing voltage for oven components solenoid valves motor board convection fan motor vent intake motor and cooling fans B Transformer steps down from Supply Voltage to 24 VAC on two secondaries 24 VAC and 24 VAC IM 1 24 VAC providing voltage for main bd 8 motor bd vent switches door switch C Transformer steps down Supply Voltage to 12 VAC on two secondaries 12 VAC Lite and 12 VAC Oxy 1 12VAC Lite Light providing voltage for the cavity door lights 2 12VAC Oxy providing voltage for oxygen sensor board and oxygen sensor 7 230 VAC A 230 VAC from transformer through TB1 6 and TB1 7 to F45495 Rev B 0515 E Page 46 of 77 On Off Switch SW4 Motor Interlock Relay R1 2 Common contact Main Board 4 High Limit switch TS1 a 230 VAC to Contactor K1 b energizes sending Supply Voltage to one side of E2 outer heating element Pins 1 2 3 230 VAC to Contactor K2 K2 energizes sending Supply Voltage to one side of E1 inner heating element Pins 1 2 3 230 VAC Com from transformer through TB1 2 3 4 and 5 to 1 Cavity Vent M2 2 V2 Main Board Heat Interlock R2 B
10. P20 wire 107 on Motor Board B Convection fan motor M1 energizes Heat Interlock relay coil R2 energizes A R2 1closes allowing the Call For Heat signal input from the Main I O board to pass to High Heat relay K3 R2 2 closes allowing the Call For Heat signal input from the Main I O board to pass to Low Heat relay K4 R3 oxygen sensor board interlock relay coil R3 energizes A Providing 12 VAC Oxy to Oxygen Board across J1 wire 42 and J2 wire 43 B D3 amber 04 red D5 green LEDs energized for 2 seconds C D3 amber LEDs energized for seconds confirming calibration of electronics on board Page 47 of 77 D 04 red LEDs energized for 3 MINUTES while the oxygen board is heating up the oxygen sensor 05 green LEDs blinks indicating transmission of Humidity data from Oxygen sensor board through piggy back connection to Main I O board 230 VAC to V1 on Main board A Main board sends Control signals through the ribbon cable to display board and illuminates the Temp Time and humidity displays B Y6 energizes the 3 cooling fans CF1 CF2 and CF3 C energizes the cold water condensate Valve 8011 to fill the p trap for 6 seconds So cold air does not get sucked up into the cooking cavity through the drain D Y10 Cavity Vent Intake motor MTR2 energizes to close the vent if previously open E Main board monitor SW1 and SW2 for
11. Turn humidity knob to initiate test Note direction of fan For example clockwise Turn humidity knob to reverse rEV motor Note direction of fan has HI Lo changed For example counter lon loFF clockwise NOTE Turning humidity knob too quickly during breaking sequence will cause oven to beep 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 on oFF 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 F45495 Rev B 0515 Page 64 of 77 Display ABC Combi Electric Oven DIAGNOSTICS TROUBLESHOOTING Description Cooling fans Fan 1 control panel fan 2 display panel fan 3 oven rear Humidity Low flow Water Valve When turned on water will flow out of water atomizer NOTE Valve flow rate 15 liters hour 25 liter min Water drain Condensate valve When turned on water will flow out drain NOTE Valve flow rate 300 liters hour 5 liters min Timer Display Humidity Display CFAn Current Sense value When on Timer display toggles between CFan and a value to indicate fans are energized Expected value approxi
12. 6 230 VAC TOF G E seconds when on off p trap 230 VAC f and if Drain Water switch turned on Sensor Input calls for cold water 230 VAC for 15 230 VAC for 15 seconds when on off seconds controlled 230 VAC for 15 switch turned on to by oxygen sensor amp seconds close vent humidity setting 12 VAC when door is 12 when door 12 VAC when door open is open is open 0 VAC 230 VAC when low 230 VAC heat called for 0 VAC 230 VAC when high 230 VAC heat called for Page 53 0177 F45495 Rev B 0515 ABC Combi Electric Oven CIRCUIT BOARD LAYOUTS MOTOR BOARD P4 P5 P6 AUX cc coco 2 gt PI FUSE P P P 14e AUX 15 AUX P16 PRI PIT PRI 8 FUSE FUSE F7 P 9 FUSE 6 25 AMP 2 Pl P20 PH NEUT SOLID STATE RELAY DERIVED FROM 947551 Fig 89 F45495 Rev B 0515 22 Page 54 of 77 ABC Combi Electric Oven WIRING DIAGRAMS WIRING DIAGRAMS TERMI _ A CHASIS 230 _ ______ 230N 68 230 N FANS 34 SECONDARY FUSED FUSED p 4 FUSED 151 44 3 TRANSFORMER SECONDARY 24 IM DERIVED FROM 947552 H d 12V OXY 12 86 He i B
13. BOARD tene eI ge rade es UA Der a da OXYGEN SENSOR eR MV terere erbe E eret bte don S MET Mae crane E ea OXYGEN SENSOR BOARD 2 1 1 42 2 220 2 2 22 2 27 2 2 4 e ceret s etse rette ott ice MOTOR CONTROL BOARD CONTROL PANEL tae pietate tierce el rodeo ON OFF SWITCH eee qa d TA ded RE qua a dira ra DISPLAY BOARD uraw eis A devra CONTROL PANEL COOLING FAN 2 2 2 2 2 CONTROL BOX COOLING FAN 2 2 1 2 2 2 REAR COOLING FAN uS RE rebas gebe etre xh pe KNOB amp ENCODER eda dace ud rada HI EIMIT THERMOSTAT treiber ker het resa anke erae CAVITY INTAKE TUBE ASSEMBLY 2 4 2 2 CAVITY VENT MOTOR eene RR RR der ehe CAVITY VENT et pa trei e ere TRANSFORMER Sindee armada nad Mis
14. Buzzerturns on until door is opened or timer is turned off Door Lights ON Docr lights flash at end of timer countdown FLSH OFF Door lights do not flash at end of countdown F45495 Rev B 0515 E Page 34 of 77 ABC Combi Electric Oven SERVICE PROCEDURES AND ADJUSTMENTS Time 2 d used Description Batch Timer Timer recalls last operated value when door is open and closed after buzzer User does not need to reset timer For example User removes a batch of fries from oven and puts in a second batch Clean reminder CLn 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 Ul 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 only 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 in
15. FIRMWARE If something other than Usb Flsh n y is displayed then refer to USB ERROR MESSAGES If n is selected with the Humidy knob turned to the left ccw the oven will return to Idle Mode If y is selected turned to the right cw the Humidity display briefly changes to show Yes then Del as the necessary flash is deleted then begins showing a percentage complete from 0 100 as the software image is flashed When flashing is complete 8 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 Enter Service Mode 1963 Verify that location now shows 08 11 14 as the firmware revision code Record HRS oven hour count E6 error before the recorded oven hour count can be ignored USB ERROR MESSAGES Error Message Corrective Action Usb Host Con 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 1 2 gt USB drive needs to be formatted in FAT32 format If this fails use a different USB drive USB Fail 4 5 7 8 or 15 18 USB Fail 9 14 Removing the USB drive once the Temperature display returns to reinsert the USB drive Removing the USB drive once the Temperature display returns to reinsert the USB drive If error persists use a different USB drive Rem
16. TC7 TC6 5 4 TC3 TC2 1 2 1 OVEN SENSOR D SENSOR WHT MAIN BOARD OXYGEN BOARD CONDENSATE DERIVED FROM 947552 13684 MAIN CONTROL BOARD CONNECTIONS Oxygen Board Connections Function Designation Designation connected gt 8 3 Wire harness connected to Oxygen sensor SW5 Oxygen Board voltage readings Designation Reference Point ON OFF Switch OFF ON OFF Switch ON 5104277 F45495 Rev B 0515 ABC Combi Electric Oven CIRCUIT BOARD LAYOUTS Eur e connected Chassis Ground input 24 VAC IM COM input Output for Humidity fill valve high relay Output for Cooling Fans CF1 CF2 and CF3 relay Output for high Heat relay Main Board Connection Points Output Voltage readings ON OFF Switch ON Set to Temperature Service Tests Knob 80 Mode LLL 0 F 230 VAC as needed Controlled by temp 230 VAC or humidity settings F45495 Rev B 0515 3222 Page 52 of 77 ABC Combi Electric Oven CIRCUIT BOARD LAYOUTS Board Connection Points Output Voltage readings ON OFF Switch ON Set to Temperature Service Tests Knob 80 Mode 0 F 230 VAC 230 VAC 230 VAC 230 VAC as needed when temp is within 50 of setpoint 0 VAC 230 VAC Controlled by oxygen sensor and humidity setting 230 Vac for
17. TEST in the upper left hand AND ADJUSTMENT da 2 Vent switches corner of the humidity Inspect the vent tube to make sure it is display 3 Vent blocked not blocked in someway Service Mode 1963 A 03 Oxygen board Oxygen sensor status 0 Oxygen board not transmitting a status Check connections Service Mode 1963 1 01 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 Does not steam in Oxygen sensor PESE Combi mode Error dot 2 Oxygen sensor board Wait 3 minutes for warming after power in the upper left hand is applied corner of the humidity Main board display Missing Ferrite Check sensor connections Check to see if ferrite is in place Check routing of cable going to Oxygen Sensor Replace sensor 2 rdY Oxygen board is ready and transmitting humidity data from sensor Oxygen board can t calibrate e Replace Oxygen board Cur Current error Oxygen board can t sense current in oxygen sensor heater Check for disconnected sensor Replace sensor 73 of 77 F45495 Rev B 0515 ABC Combi Electric Oven DIAGNOSTICS TROUBLESHOOTING Fuse F1 fuse link in Does not steam in tenmitial black Combi mode Error dot in the upper left hand Fu
18. 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 panek CONTROL BASE PANEL SCREWS 6 PLACES COOLING Fig 38 NOTE Use when removing back of control panel cover Wires are attached Page 20 of 77 ABC Combi Electric 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 available 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 i ENCODER RIBBON CABLE 3 PLACES Fig 39 7 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 procedures to install Check for proper operation Page 21 of 77 CONTROL PANEL COOLING FAN ky amp WARNING Disconnect the
19. this procedure 6 Remove the nut securing the support bracket of the heating element s to be removed F45495 Rev B 0515 Fig 76 7 If replacing the inner heating element A Remove two nuts securing nozzle to oven cavity e Fig 77 B Loosen hose clamp securing hose to nozzle 26818 Fig 78 C Pull hose free of nozzle Page 30 of 77 ABC Combi Electric Oven REMOVAL AND REPLACEMENT OF PARTS D The nozzle is now loose but itis easier to CONTACTORS remove the nozzle and heating element at the same time p WARNING Disconnect the electrical power to the machine and follow lockout tagout procedures 8 Removeleads going to the heating element to be removed 1 Remove Right Panel INNER ELEMENT OUTER ELEMENT 2 Remove wires going to T1 T2 and T3 of the contactor to be replaced 3 Using a flat blade screwdriver pull out the orange tab releasing the contactor from the din rail NOTE On each lead there is the following nut washer terminal lead washer nut ceramic insulator All of which needs to be removed 9 Remove the nuts and lock washers securing heating element 4 Remove wires from back side of contactor 5 Replace contactor and reassembly in reverse order 26839 Fig 80 NOTE This will require either a pass thru socket and rachet or several 11 16 deep well sockets welded together 10 Remove heating elemen
20. within 50 of setpoint for steam Page 75 of 77 F45495 Rev B 0515 ABC Combi Electric Oven DIAGNOSTICS TROUBLESHOOTING SYMPTOM POSSIBLE CAUSE 1 Excessive moisture in oven or not enough moisture in oven 2 3 Incorrect heat Oven temperature does not match setpoint 4 5 1 Uneven Baking 1 Temperature of drain water too high F45495 Rev B 0515 Service Mode 1963 A Y5 High Humidity test Run Y8 Low Humidity test Run Y10 Cavity vent intake test Run 01 Oxygen sensor power test 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 CONFIGURATION MODE 1972 A Check P1 and P24 See CONFIGURATION MODE 1972 for details Perform TEMPERATURE CALIBRATION Service Mode 1963 A Y5 High Humidity test Run Y6 Low Humidity test un F1 Convection Fan test Run S6 Door test Run Y14 Low Heat test Run Y15 High Heat test Do a HEATING ELEMENTS RESISTANCE CHECK Heating circuit malfunction NOTE Remember that the Overshoot feature engages during the first call for heat and will overshoot the setpoint temporarily Service Mode 1963 A Run F1 Convection Fan test B Run Convection Fan reverse test C Run 10 Cavity vent intake test Check intake vent an
21. xy 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 available 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 Place 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 PANEL SCREWS 6 PLACES n comm COOLING Fig 42 4 Disconnect cooling fan wire connection 5 Remove cooling fan nuts F45495 Rev B 0515 ABC Combi Electric Oven REMOVAL AND REPLACEMENT OF PARTS COOLING FAN NUTS x4 COOLING 777 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 0 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 Remove Right Panel Unplug two wires going to fan 1 2 3 Remove two screws securing fan to frame 4 Reverse proc
22. 0515 2 WAY JUMPER POSITION SW1 CAVITY VENT 44 Cavity vent 2WAY SPADE TERMINALS JUMPER POWER SUPPLY 1 2 chassis Vr n CHASSIS TO GROUND SCREW com K1 N O AUX 341 340 62 C P6 1 SW3 DOOR SWITCH 52 51 1 6 SWITCH SHOWN IN DOOR CLOSED POSITION 11 151 HI LIMIT 137 T 5 4 SAFETY QUTER 336 A36 5 3 1 3 lt 335 6 8 R21 ES e 6 4 R22 1347 AR 974 28 6 3 SEE FAN DETAIL MTR2 CAVITY VENT 70 71 66 69 jo P26 SOL 3 HUMIDITY VALVE CAVITY HIGH FLOW 65 22 sor HUMIDITY VALVE CAVITY LOW FLOW 346 D SARATED P3 8 63 P233 P2 5 64 67 P24 SOL COLD WATER CONDENSATE INTERLOCK HEAT INTERLOCK MOTOR HEAT OXYGEN INTERLOCKED TO SWITCH OXYGEN INTERLOCK Fig 93 Page 58 of 77 A13682 ABC Combi Electric Oven WIRING DIAGRAMS FROM TRANSFORMER SECONDARY VAC 230 24V GRY REF F3 151 4A FUSE LINK TB4 16 T8415 78 BLUWHT 145 E 2 HESS TO MAIN I O BOARD TERMINAL BLOCK TB2 E A En 050 Ax Bu 9191 CONV FAN BK 8 92 PRIMARY cowFN BRN 619 FUSE 519 OVENSENSOR 3 97 COOLING FANS 135 1 133 DERIVED FROM 947551 MOTOR BOARD MOTOR BOARD DETAIL 1 MOTOR BOARD ZERO CROSS CU
23. 32 300 785 350 836 400 887 450 938 TEMPERATURE CALIBRATION 1 Place 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 An amplitude of more than 40 F may indicate a problem with heat source For example poor combustion see combustion analysis F45495 Rev B 0515 ABC Combi Electric 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 posit
24. E1 3 and E1 4 to check the three elements making up the Inner set Measure between terminals E2 1 and E2 6 E2 2 and E2 5 and E2 3 and E2 4 to check the three elements making up the Outer set F45495 Rev B 0515 22 42 of 77 ABC Combi Electric Oven ELECTRICAL OPERATION ELECTRICAL OPERATION COMPONENT FUNCTION Main Board Display Board Motor Control Encoders SW7 SW8 SW9 Oxygen Board Oxygen Sensor SWS 2 neg Door Switch SW3 ON OFF Switch Manages all input output functions of oven as required for combi cook operation Monitors oven temp RTD probe and outputs call for heat to contactors 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 Monitors N O Aux contactor contacts for high limit errors and monitors oxygen board and motor board for oxygen sensor and convection fan motor errors Pro
25. MN PM E ie INTRODUCTION 224 dct cte cL VE LL T eM nt OPERATION CLEANING AND MAINTENANCE 4 41 2 2 2 2 222 LUBRICATION bci e te pee tette ree tla ire tle e spate Sagal aes e an WATER QUALITY STATEMENT 2 7 1 44 22 SPECIFICATIONS ayana ue rh eee sa mv deci dod ra bbs x Rp aede sex Bre UPGRADE ABC COMBI FIRMWARE e e nl FIRMWARE VERSION HISTORY 2 7 2 FIRMWARE UPDATE PROCEDURE 2 2 2 222 22 2 USB ERROR MESSAGES REMOVAL AND REPLACEMENT OF PARTS 14 42 7 7 42 22 220 02 2 o etr bdo LC LE I LIA s INNER DOOR eren uate att INNER DOOR LATCH pog pede ttes te tie apt Mart lees daa ae LET o sa eae DOOR LAMP EpL DOOR EATGEDP teer reete DOOR SWITCE CEDE CONVECTION MOTOR ce e e RR Gels Gee e reed a a CONVECTION FAN BAFFLE 25 TI MIR DOR ERA eek ae t eie pd ee le onda MAIN CONTROL
26. O CONNECTOR P3 5 TO CONNECTOR P36 9 gt _ N O CONTACT N O CONTACT _ i Nc wi WIRE 77 af TN TO CONNECTOR P34 TO CONNECTOR P3 3 ui 222 WS CONTACT TO CONNECTOR P34 Ne CONTACT WIRE 45 TO CONNECTOR P32 26767 Fig 83 4 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 10 11 1 Fig 84 5 Connect a meter set to check resistance to the common terminal and the N C contact of switch 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 Page 41 of 77 Use the meter to check the common terminal and the N C contact of both switches Both switches at this point should read open Quick check A Connect a meter set to check resistance to the common terminal and the N C contact of switch 1 Using a pair of channel locks rotate the damper camshaft through one revolution 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 Repeat this check for switch 2 Reconnect wires to both vent switches Reat
27. OARD 24947 Fig 26 Secure using screws from replaced board Power on unit CALIBRATING OXYGEN SENSOR BOARD Check for proper operation FERRITE Qu W WARNING Disconnect gt 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 F45495 Rev B 0515 ABC Combi Electric Oven REMOVAL AND REPLACEMENT OF 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 lt WARNING 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 available 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 F45495 Rev B 0515 FUSE F7 ANY 4942 Fig 29 5 Replace motor control board 6 Reverse procedure to install Check for proper operation CONTROL PANEL WARNING the electrical power to the machine
28. ORMER rar a teen pee ee ede e tete eoe vixit e 56 HEATING ELEMENTSOS at ere IH RE UE dei de 57 MAIN BOARD Cote bi it oit pd ieu el de e datas a 58 25 0 rA er te Eee dne der E Heri PI qa es de 59 COOLEINQG EAINOS nci ee as de ge yi e QUU NIN ae Re 60 WIRING CHANGES FOR SINGLE PHASE 22 61 DIAGNOSTICS TROUBLESHOOTING 0 2 2 2 2 22 2 62 SERVICE MODE 1963 e ee n b RR RR 62 ERROR CODES AL a eau bie 67 OVEN TROUBLESHOOTING 25525 heath pere d eese iati PR RH e RR Rc 70 CHECK uere cial iad orci RE RR RR Ru 70 TROUBLESHOOTING USING ERROR CODES 70 TROUBLESHOOTING BY SYMPTOM 2 40 74 VULCAN 2015 30f77 F45495 Rev B 0515 ABC Combi Electric Oven SERVICE UPDATES SERVICE UPDATES SERVICE UPDATES ABC COMBI ELECTRIC OVEN J
29. RRENT SENSE REVERSE SOLID STATE RELLAY Page 59 of 77 FROM TRANSFORMER SECONDARY VAC 240 230V COM COM VIO RED 152 146 285 CONVECTION FAN MOTOR A13672 F45495 Rev B 0515 F45495 Rev B 0515 ABC Combi Electric Oven WIRING DIAGRAMS REF WIRE 34 FROM Y6 ON MAIN BOARD COOLING FANS COOLING FAN DETAIL 2 CF1 COOLING FAN 1 CONTROL PANEL 79 81 82 P1 1 CF2 COOLING FAN 2 ELECT PANEL 138 e 5 1 COOLING FAN 3 OVEN REAR TB2 1 132 134 Page 60 of 77 ABC Combi Electric Oven WIRING DIAGRAMS WIRING CHANGES FOR SINGLE PHASE 309 315 7 23 307 306 312 SINGLE PHASE WIRING 305 311 304 310 LINE IN INSTALLED IN FIELD ELEMENT WIRING DIAGRAM DETAIL 3 ALTERNATE WIRE 342 CONNECTED FOR CUSTOMER VOLTAGE AT FACTORY cuss ce OPTON 3723 Fig 96 61 77 5 F45495 Rev B 0515 ABC Combi Electric Oven DIAGNOSTICS TROUBLESHOOTING DIAGNOSTICS TROUBLESHOOTING SERVICE MODE 1963 Log Into Service Mode 1963 1 Turn unit on NOTE Oven must have no temperature set to enter Service Mode 2 Turn Timer knob counterclockwise until Timer display shows SEt 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 Tim
30. SERVICE MANUAL VULCAN ABC Combi Electric Oven ABC7E ML 137716 NOTICE 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 F45495 Rev B 0515 ABC Combi Electric Oven TABLE OF CONTENTS SERVICE UPDATES eost aet terdum qud doeet dua Delain bela duvide Hola qubd Pelota SERVICE UPDATES ABC COMBI ELECTRIC OVEN 27 22 GENERALS uto Modus Run Lr
31. TCH BRACKET Fig 16 Slide reed switch out from control switch bracket Remove reed switch screws Reverse procedures to install Check for proper operation F45495 Rev B 0515 ABC Combi Electric 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 available to prevent damage The field service kit must be used anytime the control board is handled WARNING 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 F45495 Rev B 0515 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
32. URATION MODE 1972 3 time function does not control or affect the heating so the oven will continue to heat after time expires 4 Humidity function not re enabled until the timer is reset and or the door is opened and closed Door Open SW3 open 1 Y14 for heat low is off 2 Y5 Humidity high water valve off 3 Low humidity water valve off NOTE Atany time in the operation if door is opened the Cook timer pauses F45495 Rev B 0515 ABC Combi Electric Oven SEQUENCE OF OPERATION Electronic Motor Break When door opens 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 direction of the motor and toggles its state from on to off or off to on 2 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 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 Drain water temperature is monitored by Main 1 O board using the drain water sensor TC1 When the drain water temperature is above 140 F A Cold water condensate valve SOL1 is energized allowing col
33. WITCH ADJUSTMENT 2 2 2 7 2 2 42 2 2 2 2 41 HEATING ELEMENTS RESISTANCE CHECK 2 2 2 7 42 ELECTRICAL OPERATION contend ert s ec 1 lu ela eruta ed aaa 43 COMPONENT FUNCTION ret eee te eed Re GC Rei Rd Re OR ene e D e 43 CONTROL PANEL COMPONET LOCATIONS 45 SEQUENCE OF OPRERATION rient ie enema Ate pata 46 CONDITIONS exstent Rat iat wise Ania aud ae puer bs o dede i 46 ON OFF SWITCH SW4 TURNED ON NO CALL FOR HEAT 47 ON OFF SWITCH SW4 ON amp WITH CALL FOR HEAT 47 ON OFF SWITCH SW4 amp WITH CALL FOR HEAT amp CALL FOR HUMIDITY 49 OTHER SEQUENCES patte Petits eed aid ona tede c vid eg 49 CIRCUIT 5 5 bete beetle ier aeria tait 51 MAIN BOARD CONNECTIONS 4 2 4 2 42 4 7 e e emere ere rene 51 MOTOR BOARD virado kie urea e th lated 54 WIRING DIAGRAMGS aedes aet vetet beu seq 55 TERMINAL BLOCKS 1 bond eese er ee er e d eu 55 TRANSE
34. ake the motor go thru 2 full cycles If no errors are encountered the vent switches and vent motor are operating properly F45495 Rev B 0515 1 into reference Turn 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 fafter 75 seconds the vent switches do not indicate a has been made the Humidity display shows Err VENT SWITCH ADJUSTMENT lt WARNING Disconnect the lt electrical power to the machine and J follow lockout tagout procedures 1 Remove reference 2 Loosen screws securing the vent screws to the frame by 1 4 turn to allow the top of the switches to be adjusted in or out LOOSEN BY 1 4 TURN 3 Remove wires 44 45 46 and 47 from the vent switches Page 40 of 77 ABC Combi Electric Oven SERVICE PROCEDURES AND ADJUSTMENTS 8 SWITCH 1 p SWITCH 2 comm TERMINAL LE COMM TERMINAL T
35. 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 available 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 Page 18 of 77 ABC Combi Electric Oven REMOVAL AND REPLACEMENT OF PARTS MOTOR CONTROL 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 10 Verify proper operation OFF SWITCH WARNING Disconnect the 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 plac
36. and oven cavity lights inoperative Oven operates Door closed Oven convection fan operates Control heat on but oven does not heat Possible error messages on Timer display 1 heat 2 door Oven cavity vent inoperative There is dot in the upper left corner of the humidity display Service Mode 1963 A Check error log for E1errors NOTE If any E1 errors are logged follow Troubleshooting using Error Codes Service Mode 1963 A Run S6 Door test Reset control by powering oven off and unplugging from the wall outlet Then restarting Check fuse F2 Service Mode 1963 A Run Y13 Oven Cavity door light test 1 If all cavity light inoperative e Check 12 volts from transformer Main Board 2 Ifonly one light out Halogen light burned out Service Mode 1963 A Run S6 Door test B Run Y14 and Y15 Heating Element test Heating circuit malfunction Perform CAVITY VENT SWITCH TEST AND ADJUSTMENT Inspectthe venttube to make sure itis not blocked in someway Check water supply to unit Service Mode 1963 Run Y5 High Humidity test n Y6 Low Humidity test n S6 Door test 01 Run 01 Oxygen sensor power test Ru Ru Run 03 Oxygen Board Oxygen sensor status test Configuration Mode 1972 Check the setting of P28 if enabled in humidity display during operation means steam is turned off Inadequate oven preheat Oven must be
37. anuary 2015 1 New Heating Element Wiring Diagram 05 20 15 2 New Software version 08 11 14 A FIRMWARE VERSION HISTORY B FIRMWARE UPDATE PROCEDURE C USB ERROR MESSAGES F45495 Rev B 0515 II Page 4 of 77 ABC Combi Electric Oven GENERAL GENERAL INTRODUCTION 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 7 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 of hand tools 2 Metric set of hand tools 3 w
38. bi Electric Oven WIRING DIAGRAMS HEATING ELEMENTS ELEMENT WIRING DIAGRAM FOR THREE PHASE FBI 480V WIRE 342 CONNECTED FOR CUSTOMER VOLTAGE 240V 208V AT FACTORY OPTION OPTION L1 L2 P66 ais T81 10 Do D di 1 8 K1 Contactor Safety a z m 242 Fig 92 NOTE Heating Elements derated to 3000 W at 208 V Page 57 o0f77 F45495 Rev B 0515 Sw ENCODER 2 sws ENCODER FROM TRANSFORMER SECONDARY 23 24V 12 PH 247 BLUMHT e 15 153 149 151 4A FUSE LINK T8420 p 582 m LATO 9 94 F9 5 ABC Combi Electric Oven WIRING DIAGRAMS MAIN BOARD VULCAN DISPLAY BOARD BOARD MAIN I O BOARD RIBBON CABLE SEE MOTOR BOARD DETAIL 1 POWER SUPPLY OXYGEN FUSE BOARD FERRITE 1 COIL WIRES 42 amp 43 FERRITE 1 NO TC1 DRAIN WATER SENSOR OXYGEN RTD1 OVEN SENSOR WIRES SUPPLIED WITH DEVICE FROM TRANSFORMER SECONDARY QV 12 24V oxy 2 Ju 150 152 230V Jes F2 4A FUSE LINK SWITCHES SHOWN IN VENT CLOSED SENSOR TO GRNI W GRND SCRE SMS CHASSIS DOOR LIGHTS Y13 22 75 5WHALOGEN F3 4A FUSE LINK DERIVED FROM 947552 F45495 Rev B
39. cesses signals from each encoder mounted to each of the three control knobs Then sends signal to Main board processes input signals from Main board 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 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 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 controlled by the Oxygen Sensor Board Magnetic reed switch it senses t
40. ctioning 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 100 both Page 49 of 77 water valves Y8 SOL2 amp Y5 SOL3 energized continually without regulation Hysteresis Cavity vent intake motor during cook cycle 1 Main 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 O board detects SW1 SW2 closed position when oxygen sensor SW5 lt setpoint for example 70 Automatic 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 Main I O board monitors SW1 and SW2 for the open position and de energizes Y 10 cavity vent intake motor OTHER SEQUENCES OV 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 2 Main board energized the on board buzzer for 5 seconds or continuously if so programmed in P8 in CONFIG
41. d before installing main control board 2 Line up holes on new main control board 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 F45495 Rev B 0515 6 Referto OXYGEN SENSOR BOARD 7 Check for proper operation OXYGEN SENSOR A WARNING Disconnect the electrical power to the machine and 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 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 carefully remove sensor from fitting Fig 24 6 Reverse procedures to install 7 When installing wire tie oxygen sensor cable as previously installed Page 16 of 77 ABC Combi El
42. d 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 Service Mode 1963 A Run Y9 Water drain condensate valve test Page 76 of 77 ABC Combi Electric Oven DIAGNOSTICS TROUBLESHOOTING SYMPTOM POSSIBLE CAUSE In Service Mode 1963 A Check PO Firmware revision If earlier than 08 11 14 follow FIRMWARE UPDATE PROCEDURE Convection Fan not running 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 not run replace Solid State Relay 77 77 F45495 Rev B 0515
43. d water in When the drain water temperature is below 135 F A Cold water condensate SOL1 is de energized Every two hours Cold water condensate valve SOL1 energized for 6 seconds to ensure the p trap remains full of water so that cold air can not be sucked into drain and into cooking cavity Rapid Cool Feature 1 F45495 Rev B 0515 Temperature setpoint is turned down by operator so that the RDT1 temperature is now 70 F higher than the temperature setpoint A Main board checks the status of the SW1 and 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 energized Page 50 of 77 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 Electric 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 Qui ET lt 85 cz eg om a zz TC9 TC8
44. e Oxygen Sensor Data Shown in 96 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 51 276 OXYGEN SENSOR Refer to CALIBRATING OXYGEN SENSOR BOARD Page 37 of77 F45495 Rev B 0515 ABC Combi Electric 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 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 to remove racks to dry cavity floor 4 Turn oven on and wait at least 3 minutes for sensor to warm up Log Into Con
45. e control panel flat on knobs Doing so will cause damage to encoders CONTROL KNOB LIFT PANEL __ 3 PLACES PANEL SCREWS 6 PLACES 4 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 Page 19 of 77 45495 Rev 0515 ABC Combi Electric Oven REMOVAL AND REPLACEMENT OF PARTS CONTROL BASE 7 PANEL SCREWS 6 PLACES COOLING FAN NOTE Usecare when removing back of control panel cover Wires are attached Certain components in this system are subject to damage by electrostatic discharge during field repairs A field service grounding kit is available to prevent damage The field service 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 F45495 Rev B 0515 DISPLAY BOARD x WARNING 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 available to prevent damage The field service kit must be used anytime
46. ectric Oven REMOVAL AND REPLACEMENT OF PARTS NOTICE 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 the 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 available 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 Page 17 of 77 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 B
47. edure to install 5 Check for proper air flow F45495 Rev B 0515 Fig 45 WARNING 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 Page 22 of 77 ABC Combi Electric 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 available 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 Place 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 BOARD NUTS RIBBON CABLE 10 PLACES i ENCODER RIBBON CABLE 3 PLACES Fig 48 5 Loosen set screw in tapped hole on knob Page 23 of 77 FLAT ENCODER n Fig 49 6 Remove encoder nut to remove encoder 7 Reverse procedures to install NOTE Tapped hole needs to be aligned with
48. emoved from inner heating elements 8 Subsequent Cycles A When temperature as monitored by RTD1 drops 1 below the setpoint on SW7 encoder 1 Y14low heat only turns back on B If temperature continues to fall and reaches setpoint 15 1 Y15high heat turns back on to assist NOTE If the temperature does not fall 15 below setpoint the oven will regulate on the low heat inner elements only NOTE The high heating element control relay is never turned on without the low heat element control relay being turned on C When RTD1 is satisfied at setpoint both Y14 and Y 15 are turned off by main board ON OFF Switch SW4 ON amp with Call for Heat amp Call for Humidity Humidification Sequence 1 Humidity knob automatically changes to the mapped humidity for that 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 I O board senses the cavity temperature on RTD1 is within 50 degrees of setpoint 4 Low humidity water valve SOL2 energizes Y5 High humidity water valve SOL3 energizes Main board monitors SW5 Oven humidity on oxygen sensor when humidity satisfied NOTE All humidity setpoints between 9095 and 10096 are treated as 9096 A Y5Humidity high water valve off B Y8 Low humidity water valve off NOTE If the oxygen sensor is not fun
49. ent 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 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 the temperature of the oven 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 Service Mode 1963 A 91 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 F45495 Rev B 0515 ABC Combi Electric Oven DIAGNOSTICS TROUBLESHOOTING Error Service Mode 1963 A Y6 Cooling fans test 1 The Timer display alternates between CFan and a value A value of 99 means all three Oven not operating Cooling fan F2 not fans are ru
50. er 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 F45495 Rev B 0515 22 Page 36 of 77 ABC Combi Electric 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 knob choices are set between 0 to 100 no Oxygen board calibrate zero Turning knob to yes indicates a multi step procedur
51. er and Humidity display will flash twice C Humidity display changes from PAs to tst when logging into Service Mode NOTE Humidity knob used to change setting 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 14 Month day year Time and HI CLS Switch closed High limit thermostat status HILt LO oPn Switch open 7 State of Door Switch HI CLS Switch closed oor Open Close door to test switch Lo oPn Switch open State of O I Switch S AC on off Toggle front panel switch to test Electric vs Gas Auto detects if oven is gas or tyPE ELE Oven Cavity Temperature current oven temp Oxygen sensor power on Err 01 Verifies 12VAC is supplied to Oxygen board is powered Oxygen Sensor Board Err Oxygen board is not powered F45495 Rev B 0515 Page 62 of 77 55 56 10 ABC Combi Electric Oven DIAGNOSTICS TROUBLESHOOTING Temp Display Description Oxygen sensor board revision number Oxygen Board Oxygen Sensor status NOTE Reported as a pair Oxygen sensor data Shown in 96 of Absolute Humidity This value will not match the 96 Relative Humidity value shown on User interface at oven cavity temperatur
52. erature not less than 100 F 38 C timer display toggles cool 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 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 096 For example timer 2 humidity 99 represents 2 9990 Exit out of Configuration Mode 1972 1 Turn Temperature knob counterclockwise until displayed TEMPERATURE SENSOR RTD1 TEST lt WARNING Disconnect the 2 SW electrical power to the machine and SS follow lockout tagout procedures 1 Remove Right Panel 2 Remove probe lead wires from Main I O board 3 Test probe with an ohmmeter TEMPERATURE in F RESISTANCE 5 OHMS Page 39 of 77 200 680 250 7
53. es less than 212 F Same value as P33 in Configuration Mode 1972 NOTE Combine the numbers in the two displays to get the complete percentage Timer Display Humidity Display example 011 If no revision number seen power off on to recognize revision date NOTE Must be revision 011 or higher 00 oFF Oxygen board not transmitting a status Check connections 01 HT Oxygen board is heating the oxygen sensor Wait 3 minutes for warming after power is applied 02 rdY Oxygen board is ready and transmitting humidity data from sensor 03 Cal Oxygen board can t calibrate itself Damaged Oxygen board 04 Cur Current error Oxygen board can t sense current in oxygen sensor heater Check for disconnected sensor 051 Combine the two numbers to get 51 2 96 Page 63 of 77 F45495 Rev B 0515 ABC Combi Electric Oven DIAGNOSTICS TROUBLESHOOTING Temp Display Description Timer Display Humidity Display Convection fan Test 1 Checks fan speeds 3 through 7 SPd lon Visually check for change in fan speed 2 Checks current sensing of mote SPd lon oFF 3 4 5 6 7 Visually check for display to change from to lon in Timer display 3 Checks breaking of motor Visually check for convection fan SPd breaking to a stop and not coasting to a stop Convection Fan Reverse Test
54. figuration Mode 1972 1 Turn unit on 2 Turn Timer knob counterclockwise until Timer displays 3 Turn Humidity knob counterclockwise until Humidity displays PAS F45495 Rev B 0515 Time Display Humidity Display YES don A Timer displays 2000 4 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 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 no 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 Page 38 of 77 ABC Combi Electric Oven SERVICE PROCEDURES AND ADJUSTMENTS Convection fan turns NOTE Oven cavity temperature must be below 100 F 4 If temp
55. flat part of encoder 8 Check for proper operation HI LIMIT THERMOSTAT W Devs WARNING Disconnect the A 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 i 1 T 24949 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 F45495 Rev B 0515 ABC Combi Electric 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 the S y 1 Remove Rear Panel 2 right side of unit disconnect plug F45495 Rev B 0515 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 harness and cable ties 4 Remove 4 nuts securing intake vent tube assemb
56. g opened to closed in cook mode Overshoot Feature A 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 located 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 F higher that 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 When temperature is set from When the On Off switch is toggled and temperature setpopint 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 Y15 call fro heat relay high is de energized on main board A contactor opens B Voltage removed from outer heating elements Y14 call for heat relay low is de energized on main board ABC Combi Electric Oven SEQUENCE OF OPERATION A K4 contactor opens B Voltage r
57. 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 Insert spare M6 cap screw into convection fan motor shaft Hand tighten only Page 14 of 77 ABC Combi Electric 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 Page 15 of 77 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 proced
58. he 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 the following relays on the main board cavity vent motor high and low humidity valve condensate tempering valve cooling fans Transformer with 480 240 or 208 VAC inputs Multiple secondary voltages as follows 230 VAC to motor board and convection fan motor vent motor all water solenoids and cooling fans 12 VAC to oxygen board and oxygen sensor 12 VAC to cavity lamps 24 VAC to main board motor board vent switches door switches high limit sensing contacts Incoming voltage supply connection from 20A fuses F5 and F6 Transformer to 230 VAC connections Convection Fan Motor MTR1 and Temperature Sensor RTD1 connections Page 43 of 77 F45495 Rev B 0515 Terminal Block Fuse F5 Fuse F6 Fuse F7 Fuse F8 Oven Door Lights L1 E2 I ee Cavity Vent Motor 2 Cavity Vent Open SW1 lE Cavity Vent Closed 8W2 os Humidity Valve Cavity Low Flow SOL2 Humidity Valve Cavity High Flow 5013 Cooling Fans CF1 CF2 erect cance Convection Fan Motor Oven Sensor Input RTD1 High Limit 1
59. ical 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 Critical Error Probe RTD readings are out of range ES oat uten Future Use E4 Controls Compartment Ambient Error Operating temperature of controls has exceed recommenced temperature limits for more than 15 minutes Drain Tempering Probe Error Drain tempering probe readings are out of range of 32 F to 250 F range Page 69 of 77 F45495 Rev B 0515 ABC Combi Electric 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 ELS Auto Electric or Gas Detection Error Control board cannot auto detect type of unit or state of auto detect pin has changed Res Future Use Vent Error Either vent motor has problem and cannot rotate or 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
60. ig 5 Fig 7 5 Reverse procedure to install 4 Place inner door in a secure location to prevent damage INNER DOOR 5 Reverse procedure to install 1 Open oven door INNER DOOR LATCH 2 Unlatch inner door using inner door latch INNER DOOR LATCH 1 Remove upper door stiffener screws and remove upper door stiffener UPPER DOOR STIFFENER SCREWS UPPER DOOR STIFFENER Fig 6 3 inner door up off door hinge 26578 Fig 8 2 Remove inner door latch screws 11 0177 F45495 Rev B 0515 ABC Combi Electric Oven REMOVAL AND REPLACEMENT OF PARTS INNER DOOR LATCH SCREWS 26577 Fig 9 3 Reverse procedure to install 4 Check for proper operation DOOR LAMP WARNING Disconnect the electrical power to the machine and follow lockout tagout procedures Fig 10 3 Push in tab to free the glass cover from lamp holder 4 Grasp lamp using cloth and remove from lamp Socket F45495 Rev B 0515 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 ser
61. ination 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 Osmosis 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 WARNING Electrical and grounding connections must comply with the applicable portions of the National Electrical Code and or other local electrical codes Supply Voltage 208V 240V 480V __ am kw KW 3 ss NOTE Single phase blower motors are user on these ovens so there is no need to check direction of motor rotation The fan will rotate in the proper direction 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 filter system Failure to connect oven to approved filter system will void warranty There is also a 3 4 garden h
62. ith measuring micro amp current tester Any VOM with a sensitivity of at least 20 000 ohms per volt can be used 4 Temperature tester thermocouple type 5 Field service grounding kit Special Page 5 of 77 1 M6 socket head cap screw 3 long hardened black oxide finish for removing convection fan from motor shaft 2 Gear puller to remove convection fan 3 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
63. ive 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 Torecall offset value enter CONFIGURATION MODE 1972 turn temperature knob to P24 Verify the value set is visible in humidity 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 switches to indicate a change for the vent Each time the test runs the motor should turn 74 of a turn 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 m
64. ly 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 Page 24 of 77 ABC Combi Electric Oven REMOVAL AND REPLACEMENT OF PARTS CAVITY VENT MOTOR amp Ja WARNING Disconnect the A SS electrical power to the machine and follow lockout tagout procedures Remove Rear Panel Remove CAVITY INTAKE TUBE ASSEMBLY Rotate damper camshaft until set screw faces the rear of the cavity intake tube assembly 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 NOTE A small straight blade screwdriver Jeweler screwdriver is needed NOTE If a 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 WARNING Disconnect the electrical power to the machine and follow lockout tagout procedures 3 Remove bottom screw securing switches to frame 2507
65. mately 99 for 3 fans 66 for 2 fans NOTE When Timer displays Err indicates that the fans are not drawing the proper current H2Lo When on Timer display toggles between H2Lo and a value to indicate solenoid is energized Expected value 6 1 NOTE Wait 10 seconds for proper value reading in timer display NOTE When Timer displays Err indicates that the valve is not drawing the proper current H2dr Drain Temp When on Timer display toggles between three things H2dr which is the name of the test a value to indicate solenoid is energized settles at a value of 6 1 and the drain tempering probe s temperature NOTE When Timer displays Err indicates that the valve is not drawing the proper current on Page 65 of 77 F45495 Rev B 0515 ABC Combi Electric Oven DIAGNOSTICS TROUBLESHOOTING Temp Display Description Timer Display Humidity Display Cavity Vent Intake VEnt CLSd Current sense and Vent 25 operation test ET Display toggles SPIn indicates Humidity display shows CLS Switches are in spinning state CLS turn humidity knob to initiate 2 Checks rotation of vent motor 5 is an approximate number test quarter turn at a time which indicates motor is energized properly Display counts up to 15 seconds if NOTE Properly check cavity operating properly vent intake by turning humidity When complete VEnt oPEn knob be
66. mer display C 999 in the humidity display D The oven would have 9 999 cooking hours 6 Turn Timer knob clockwise one more click and LOg is displayed in the Temperature display F45495 Rev B 0515 Page 68 of 77 ABC Combi Electric 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 EO 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 in the temperature display 2 Timer Display toggles between E1 and 0009 3 Humidity display flashing 999 4 Means that an 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 i
67. mizing 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 Page 33 0177 F45495 Rev B 0515 ABC Combi Electric Oven SERVICE PROCEDURES AND ADJUSTMENTS Time Display Humidity Display Description Define Humidity Selection in UI NOTE Only when P4 is setto 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 to manual adjust humidity HAdJ on oFF settings during operation Oven Buzzer ON Buzzer stops after 5 seconds b5 OFF
68. n which the error occurred NOTE 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 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 Contactors K1 and K2 ETE Convection Fan Motor Error Crit
69. nning properly Intermittent or running or running in the erratic wrong direction 21 Make sure 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 Service Mode 1963 A Run Y9 Water drain condensate valve test Drain tempering probe 1 When the test is running the Uses too much water or Timer display toggles does not temper drain 4 grain condensa between three things H2dr water which the name of the test the Main board drain tempering probes temperature reading and a value that indicates the valve is energized should be a valve of 6 plus or minus 1 Service Mode 1963 A Run F1 Convection Fan test Check LEDs on motor board cooking properly Motor board e Ifred LED is on when the Convection fan not working Solid State relay motor is not running replace motor board If yellow LED is on and motor does not run replace Solid State Relay AN electric oven thinks 1 Service Mode 1963 x 1 Main board it s gas A 511 Auto Detect test esm Ce fesom Ceo fesom 4 5 6 7 8 9 2 F45495 Rev B 0515 Page 72 of 77 ABC Combi Electric Oven DIAGNOSTICS TROUBLESHOOTING Poor cooking Error dot 1 Vent motor Perform CAVITY VENT SWITCH
70. on fan motor causing an E6 error Fixed an issue with the P4 P5 and P6 custom temperature settings It 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 In Configuration Mode 1972 Increases the maximim temperature setting in Parameter 081114 08 11 14 P15 to 482F 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 Numbers 541074355 480V 541074349 208V FIRMWARE UPDATE PROCEDURE 1 Obtain a 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 the door is closed 4 the Oven in Idle Mode Temperature display A NoSetTemperature B Notin Service Test Mode 1963 NOTE The Convection Fan Motor may or may not come on when the flash drive is inserted C Configuration Mode 1972 5 Insert the USB drive into the oven s USB A port 6 View the LED displays on the front of the oven 7 Usb Fish n y appears on the display F45495 Rev B 0515 22 Page 8 of 77 ABC Combi Electric Oven UPGRADE ABC
71. 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 hours 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 Page 67077 _ F45495 Rev B 0515 ABC Combi Electric Oven DIAGNOSTICS TROUBLESHOOTING Log Into Service Mode 1963 1 Turn unit on 2 Turn Timer knob counterclockwise until Timer display shows SEt 3 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 5 Turn Temperature knob clockwise through all tests in service mode until HRS is displayed in 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 Ti
72. ose fitting located on rear of machine labeled NON FILTER Plumbing Connections F45495 Rev B 0515 WARNING Plumbing connections must comply with the applicable sanitary safety and plumbing codes Supply water requirements 1 2 0to 6 0 grains of hardness per gal 2 pH7 0to 8 0 3 Chlorides less than 30 PPM Drain Connection Page 6 of 77 ABC Combi Electric Oven GENERAL 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 a 1 NPT male port for drain The drain plumbing not supplied should have a constant slope towards the floor drain Do not connect solidly to floor or other drains Page 7 of 77 F45495 Rev B 0515 ABC Combi Electric Oven UPGRADE ABC COMBI FIRMWARE UPGRADE ABC COMBI FIRMWARE fixes which were introduced with that particular FIRMWARE VERSION HISTORY This section contains the history of the ABC7 Combi NOTE The current version of firmware loaded in to Oven Firmware The release date of the Firmware is the oven can be identified in Service Mode 1963 how itis identified The table below will list the release location PO date along with a short explanation of the features 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 convecti
73. oving the USB drive once the Temperature display returns to reinsert the USB drive If error persist replace Main Control Board Page 9 of 77 F45495 Rev B 0515 ABC Combi Electric 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 in the upper right hand corner PANEL HANDLES 24690 Fig 2 3 Reverse procedure to install Fig 4 1 Remove Right Panel NOTE Cani 5 Remove four rear panel screws 2 Remove two fan screws 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 6 panel and can be left assembled Lift with handles to remove 7T 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 Lift left panel up and back towards the rear of the unit F45495 Rev B 0515 Page 10 of 77 ABC Combi Electric Oven REMOVAL AND REPLACEMENT OF PARTS F
74. r MTR1 energizes HI LO HEAT OPERATION 1 Y14 Call for heat low relay energizes on main board 2 Contactor K4 energizes providing supply voltage to inner elements E1 pins 4 5 6 NOTE Inner elements begin to heat since K2 is already energized 3 15 Call for heat high relay energizes on main board 4 Contactor energizes providing supply voltage to outer elements E2 pins 4 5 6 NOTE Outer elements begin to heat since K1 is already energized 5 Rate of Rise Check A Cavity temperature probe 1 is monitored by the main board at xa1 and xa2 and turns off the call for heat both high and low when cavity temperature on RTD1 is satisfied same as setpoint on SW7 encoder 1 During the initial heating cycle the rate of temperature rise is checked As temperature rises at setpoint 15 if the temperature is rising faster than 2 per second both heating elements call for heat Y14 and Y 15 are turned off before the RTD1 temperature is satisfied This is done to prevent too big of a temperature overshoot The initial heating cycle is defined as the first time the control board calls for heat after a First time a temperature setpoint is entered in cook mode When temperature is set from F45495 Rev B 0515 2 Page 48 of 77 When the On Off switch is toggled and temperature setpopint is automatically recalled b Whenitis detected that the door goes from bein
75. r Display Humidity Display Condensate Tempering Water Conner Example 999 NOTE Same value as P20 in Example 0009 CONFIGURATION MODE Example Total gallons 9 999 1972 Cooking Hours NOTE Same value as P18 in Example 999 CONFIGURATION MODE Example 0009 1972 Example Total hours 9 999 Hour counter does not increment in idle mode LOg Refer to ERROR CODES Logging out of Service Mode 1963 1 Turn 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 are 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
76. rize 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 component cooling Circulates air through the oven cavity Driven by motor control board through capacitor C1 Reverses direction at programed intervals Senses oven cavity temperature and sends the data to the Main board Removes power from element safety contactors K1 and K2 if oven cavity overheats The status of the High Limit is sent to the main board by aux contacts on K1 Admits water to p trap on power up to seal oven cavity Admits water p trap to mix with drain water to cool drain discharge water to 140 F before exiting oven Monitors drain water temperature and is monitored by Main board Removes 230 VAC to the motor control board when the On Off switch is Off Is used to disable the call for heat signal from the main board to the contactor coils of K3 and K4 when On Off switch is off Safety Outer Provides voltage to outer heating elements Removes voltage when high limit is tripped Page 44 of 77 ABC Combi Electric Oven ELECTRICAL OPERATION Contactor K2 Safety Inner Provides voltage to inner heating elements Removes voltage when high limi
77. s 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 F45495 Rev B 0515 222 Page 32 of 77 ABC Combi Electric Oven SERVICE PROCEDURES AND ADJUSTMENTS Time Display Humidity Display Description Temperature knob increments Temperature increment can be adjusted 1 5 10 25 by 1 5 or 10 degrees Humidity knob increments Humidity can be adjusted by 1 or 10 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 and CUSt Custom Factory FACt and Custom settings will be remembered CUSt 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 Indicates customer settings are currently loaded SEt Turn knob to edit custom settings oN TIP Select ALL on to begin custo
78. se F8 on Oxygen Check fuses corner of the humidity board display relay Service Mode 1963 A Run Y6 Cooling fans test No obvious symptom Cooling Fan 1 The Timer display alternates between CFan and a value A value below 65 means at least one fan is not running Troubleshooting by Symptom NOTE It is highly recommended that you check the error log and run the test available in reference SYMPTOM POSSIBLE CAUSE 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 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 Service Mode 1963 A Run S6 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 F45495 Rev B 0515 Page 74 of 77 ABC Combi Electric Oven DIAGNOSTICS TROUBLESHOOTING SYMPTOM POSSIBLE CAUSE Oven operates Door closed and convection fan inoperative Oven operates Door closed
79. t 11 Reassemble in reverse order Page 31 of 77 _ F45495 Rev B 0515 ABC Combi Electric 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 Turn unit on 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 PAS A Timer display will show 2000 5 Turn Timer display counterclockwise to 1972 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 to go to the next configuration setting NOTE Currently addresses P21 P22 P29 P30 P31 and P32 are blank 2 Presently P35 i
80. t is tripped Contactor K3 Hi Heat Outer Provides voltage to the outer heating element and is controled by the high heat relay on main board Contactor K4 Contactor Low Heat Inner Provides voltage to the inner heating element and is controled by the low heat relay on main board Oxygen Board Removes power to the oxygen board and sensor when the On Off switch is Off Interlock Relay R3 ERE Fan Motor Relay Solid State Relay used to drive the convection fan motor Is controlled by the motor control RO pine board Passive electric component used to suppress high frequency noise from the oxygen sensor board CONTROL PANEL COMPONET LOCATIONS FERRITE OXYGEN SENSOR BOARD MAIN BOARD HIGH LIMIT MOTOR BOARD F7 Fig 87 Page 45 of 77 45495 Rev 0515 ABC Combi Electric Oven SEQUENCE OF OPERATION SEQUENCE OF OPERATION CONDITIONS 1 Unit plugged into incoming power supply and is properly grounded ON OFF switch SW4 off Door switch closed SW3 High limit switch closed 208 VAC or 240 VAC or 480 VAC to TB3 either 3 phase or 1 phase A 208 or 240 or 480 as Supply Voltage to 1 Contactor terminals L1 L2 and L3 Contactor K2 terminals 1 12 and L3 Contactor terminals L1 L2 and L3 d A O N Contactor K4 terminals L1 L2 and L3 Fuse F5 to TB1 10 for 208 VAC 11 for 240
81. tach panels DOOR SWITCH ADJUSTMENT 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 To adjust the door reed switch ky d WARNING Disconnect the S N S electrical power to the machine and follow lockout tagout procedures Remove Right Panel Remove Control Panel Loosen the two screws securing the Reed Switch to the bracket to adjust the Reed Switch side to side F45495 Rev B 0515 ABC Combi Electric Oven SERVICE PROCEDURES AND ADJUSTMENTS K1 T1 E2 OUTER 316 E1 INNER ome es E2 4 K2 T2 E K2 T3 a 554 K4 T1 rM K4 T3 mu K4 T2 HEAT ELLEMENT TERMINALS REAR VIEW Fig 85 DERIVED FROM 947552 D Loosen the two bolts securing the Reed Fig 86 Switch bracket to the control panel to adjust the Reed Switch up and down Resistance Element Voltage Measurement HEATING ELEMENTS RESISTANCE CHECK WARNING Disconnect the electrical power to the machine and follow lockout tagout procedures There may be multiple circuits Be sure all circuits are disconnected There are two sets of Heating Elements E1 Inner and E2 Outer each set is made up of three individual elements Measure between terminals E1 1 and E1 6 E1 2 and E1 5 and
82. take 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 3507 F45495 Rev B 0515 ABC Combi Electric 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 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 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 clockwise for positive offset to lower overall cavity Temperature calibration Temperature temperature Turn humidity knob count
83. the closed position and de energizes Y 10 cavity vent intake motor F Y13energizes turning on the cavity lights Switch SW4 ON 8 with Call for Heat 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 Amber colored LED turns on to indicate that a drive signal is being sent to the external solid state relay F45495 Rev B 0515 ABC Combi Electric Oven SEQUENCE OF OPERATION 3 colored LED indicates the direction of the motor and toggles its state from on to off or off to on every 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 Red LED indicates the presence of current in the convection fan motor and signals the main I O board through the ribbon cable 5 The Solid State Relay R6 energizes 6 Convection Fan Moto
84. to reduce costs associated with machine cleaning reduce deliming and reduce corrosion of metallic surfaces Daily washing and rinsing of the cavity is required 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 NOTE Failure to properly maintain water quality or preventative procedures for water can lead to issues not covered under warranty F45495 Rev B 0515 ABC Combi Electric Oven GENERAL WATER SUPPLY GENERAL GUIDELINES 1 Supply Pressure dynamic flow 3080 psig 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 comb
85. tween oPn and CLSa NOTE Err 5 switches are in minimum of 4 times to get full an error state see CAVITY rotation VENT SWITCH TEST AND NOTE Counts past 15 indicate 3 Times rotation of quarter turn ADJUSTMENT ise eddie sd dara to verify vent switches seat NOTE When timer display properly shaft Err indicates that the vent 4 Checks for current feedback to motor is not drawing the proper verify motor is energized current 1 Checks state of vent switches When complete Humidity knob will read oPn LItE when on Timer display toggles between LItE and a value to indicate lights are energized Oven cavity door light expend values on oFF 75 for 3 lights 50 for 2 lights 25 for 1 light 0 for no lights on Lo Ht Low Heat Inner Elements Display toggles between Lo Ht on oFF and the temperature reading from RTD1 temperature probe Hi Ht High Heat Outer Elements Display toggles between Hi Ht on oFF and the temperature reading from RTD1 temperature probe Temperature Timer Humidity Display displays sequence thru dots and Test assure led light segments digits O 9 oFF on operate Example 000 111 etc Humidity Water Counter NOTE Same value as P19 in Example 0009 EAE oe CONFIGURATION MODE Example Total gallons 9 999 1972 F45495 Rev B 0515 2 Page 66 of 77 ABC Combi Electric Oven DIAGNOSTICS TROUBLESHOOTING Temp Display Description Time
86. ures E 72 X Ss 5 7 1 Remove Right Panel 2 Remove Rear Panel Page 27 of 77 3 Remove wire ties attaching wires going to temperature sensor to the oxygen sensor cable Fig 65 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 INSERT HEAD OF SCREWDRIVER TO RELEASE WIRE Fig 66 5 Push back installation to get access to the nuts securing the probe F45495 Rev B 0515 ABC Combi Electric Oven REMOVAL AND REPLACEMENT OF PARTS 4 Remove two wires going to valve 5 Loosen hose clamp and pull valve free of hose 6 Remove the two nuts 7 Remove temperature sensor RTD1 from unit 8 Install new probe 6 Replace valve 9 Reverse procedure to install 7 Reverse procedure to install NOTE Attach wire ties in same spots as before DRAIN WATER _ DRAIN WATER CONDENSATE VALVE WARNING the electrical power to the machine and follow lockout tagout procedures 1 Remove Right Panel 2 Loosen screws for terminal TC1 and remove wires 1 Remove Right Panel 2 Remove Rear Panel Remove two screws securing valve to utility panel 3 Cut cable ties securing wires going to drain water thermocouple Fig 68 4 Loosen nut securing the thermocouple NOTE Gas Unit shown F45495 Rev B 0515
87. ures to install NOTE Verify convection fan baffle is hooked on top baffle hangers and supported behind the bottom baffle support guides 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 available 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 F45495 Rev B 0515 ABC Combi Electric 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 aS AY Disconnect the 2 Remove Right Panel 3 Remove electrical connections from main control board and oxygen sensor board 4 Remove main control board 1 NYLON PE 10 PLACES 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 boar
88. vicing the oven The cooking compartment contains live steam Stay clear when opening door Door Cam 1 Open door and remove INNER DOOR 2 Remove door lock cover 24705 Fig 12 3 Remove cam screw and washer Page 12 of 77 ABC Combi Electric 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 24 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 Page 13 of 77 DOOR SWITCH Ky WARNING Disconnect the N electrical power to the machine and Su Hes 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 SWI

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