Vulcan ABC7G User Manual

SERVICE MANUAL

ABC Combi Gas Oven

ABC7G ML-137715

- 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

F45491 (0714)

ABC Combi Gas Oven

TABLE OF CONTENTS

GENERAL .................................................................................................. 4

INTRODUCTION ....................................................................................... 4

OPERATION, CLEANING AND MAINTENANCE ........................................................ 4

TOOLS ................................................................................................. 4

LUBRICATION ......................................................................................... 4

WATER QUALITY STATEMENT ........................................................................ 4

SPECIFICATIONS ...................................................................................... 5

REMOVAL AND REPLACEMENT OF PARTS ............................................................... 6

PANELS ............................................................................................... 6

INNER DOOR .......................................................................................... 7

INNER DOOR LATCH .................................................................................. 7

DOOR LAMP ........................................................................................... 8

DOOR LATCH .......................................................................................... 8

DOOR SWITCH ........................................................................................ 9

CONVECTION FAN MOTOR .......................................................................... 10

CONVECTION FAN BAFFLE .......................................................................... 11

MAIN CONTROL BOARD ............................................................................. 11

OXYGEN SENSOR ................................................................................... 12

OXYGEN SENSOR BOARD ........................................................................... 13

FERRITE ............................................................................................. 13

MOTOR CONTROL BOARD ........................................................................... 14

CONTROL PANEL .................................................................................... 14

ON / OFF SWITCH .................................................................................... 15

DISPLAY BOARD ..................................................................................... 16

CONTROL PANEL COOLING FAN .................................................................... 17

CONTROL BOX COOLING FAN ....................................................................... 18

REAR COOLING FAN ................................................................................. 18

KNOB & ENCODER ................................................................................... 19

HI-LIMIT THERMOSTAT .............................................................................. 19

CAVITY INTAKE TUBE ASSEMBLY ................................................................... 20

CAVITY VENT MOTOR ............................................................................... 21

CAVITY VENT SWITCHES ............................................................................ 21

GAS VALVE .......................................................................................... 22

IGNITOR .............................................................................................. 22

FLAME SENSOR ...................................................................................... 23

BURNER .............................................................................................. 24

INDUCER BLOWER ................................................................................... 24

HEAT EXCHANGER ASSEMBLY ...................................................................... 25

DRAFT INDUCER PRESSURE SWITCH ............................................................... 26

IGNITION MODULE ................................................................................... 26

TRANSFORMER ...................................................................................... 27

TEMPERATURE SENSOR (RTD1) .................................................................... 28

DRAIN WATER CONDENSATE VALVE ................................................................ 29

DRAIN WATER THERMOCOUPLE .................................................................... 29

HUMIDITY VALVE .................................................................................... 30

SERVICE PROCEDURES AND ADJUSTMENTS ........................................................... 32

CONFIGURATION MODE (1972) ...................................................................... 32

LOG INTO CONFIGURATION MODE 1972 ........................................................ 32

TO REVIEW / CHANGE CONFIGURATION MODE 1972 SETTINGS ............................... 32

LOGGING OUT OF CONFIGURATION MODE 1972 ............................................... 38

CALIBRATING OXYGEN SENSOR BOARD ........................................................... 38

GAS VALVE PRESSURE CHECK AND ADJUSTMENT ................................................ 39

TEMPERATURE CALIBRATION ....................................................................... 40

TEMPERATURE SENSOR (RTD1) TEST .............................................................. 41

COMBUSTION ANALYSIS ............................................................................ 41

F45491 (0714) Page 2 of 83

ABC Combi Gas Oven

CAVITY VENT SWITCH TEST AND ADJUSTMENT .................................................... 41

FLAME SENSE VOLTAGE TEST (FENWAL SERIES 35-61) ............................................ 43

DRAFT INDUCER TEST .............................................................................. 43

DOOR SWITCH ADJUSTMENT ....................................................................... 44

ELECTRICAL OPERATION ................................................................................ 46

COMPONENT FUNCTION ............................................................................ 46

ELECTRICAL PANEL COMPONENT LOCATION ...................................................... 48

SEQUENCE OF OPERATION ............................................................................. 49

CONDITIONS ......................................................................................... 49

ON/OFF SWITCH (SW4) TURNED ON, (NO CALL FOR HEAT) ........................................ 50

ON/OFF SWITCH (SW4) ON & WITH CALL FOR HEAT ................................................ 51

ON/OFF SWITCH (SW4) ON & WITH CALL FOR HEAT & CALL FOR HUMIDITY ....................... 52

OTHER SEQUENCES ................................................................................. 53

CIRCUIT BOARD LAYOUTS .............................................................................. 54

MAIN BOARD CONNECTIONS ........................................................................ 54

MOTOR BOARD ...................................................................................... 57

IGNITION MODULE ................................................................................... 58

WIRING DIAGRAMS ...................................................................................... 59

TERMINAL BLOCKS AND TRANSFORMER ........................................................... 60

MAIN BOARD ......................................................................................... 61

MOTOR BOARD ...................................................................................... 62

IGNITION MODULE ................................................................................... 63

COOLING FANS ...................................................................................... 64

DIAGNOSTICS / TROUBLESHOOTING ................................................................... 65

SERVICE MODE (1963) ............................................................................... 65

ERROR CODES ...................................................................................... 71

OVEN TROUBLESHOOTING .......................................................................... 74

QUICK OVER ALL CHECK ........................................................................ 74

TROUBLESHOOTING USING ERROR CODES .................................................... 74

TROUBLESHOOTING BY SYMPTOM ............................................................. 79

IGNITION CONTROL MODULE TROUBLESHOOTING .................................................... 83

IGNITION CONTROL MODULE TROUBLESHOOTING ................................................ 83

Page 3 of 83 F45491 (0714)

ABC Combi Gas 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 ½ to 6 minutes; however, a 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 & Operation Manual (F47110) for specific operating instructions.

TOOLS

Standard

1. Standard set of hand tools.

2. Metric set of hand tools.

3. VOM with measuring micro amp current tester. (Any VOM with a sensitivity of at least 20,000 ohms per volt can be used.)

4. Inclined manometer - Dwyer Cat #1227 or equivalent.

5. 1/4" T with 1/4" tubing.

7. Field service grounding kit.

Special

1. Combustion analyzer.

2. M6 socket head cap screw 3" long (hardened black oxide finish) for removing convection fan from motor shaft.

3. Gear puller to remove CONVECTION FAN MOTOR.

LUBRICATION

1. Ovens have self-lubricating composite bearings. No lubrication required.

2. Anti seizing compound.

WATER QUALITY STATEMENT

The fact that a water supply is potable is no guarantee that it is suitable for steam generation. Proper water quality can improve the taste of the food prepared in the oven, reduce scale build-up or corrosion, and extend equipment life. Local water conditions vary from one location to another and can change throughout the year. The recommended water treatment for effective and efficient use of this equipment will vary depending on the local water conditions. Your water supply must be within the general guidelines outlined in the chart below at all times during use of this machine or service issues not covered under warranty may result.

Water hardness should be treated by removing the impurities (water softener with carbon block or dechlorinator and/or in-line water treatment). Low water hardness may also require a water treatment system to reduce potential corrosion. Water treatment has been shown to reduce costs associated with machine cleaning, reduce deliming and reduce corrosion of metallic surfaces.

Daily washing and rinsing of the cavity is 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.

6. Temperature tester (thermocouple type).

F45491 (0714) Page 4 of 83

ABC Combi Gas Oven - GENERAL

NOTE: Failure to properly maintain water quality or preventative procedures for water can lead to issues not covered under warranty.

WATER SUPPLY GENERAL GUIDELINES

Supply Pressure (dynamic flow)

30-60 psig

less than 3 grains (17.1

Hardness

ppm = 1 grain of hardness)

Silica less than 13 ppm

Chloramines

Chlorides

Total Chlorine

zero

less than 30 ppm

zero

PH range 7-8

Un-Dissolved Solids less than 5 microns

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 .

A carbon block filter system should always be 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.

If the Chlorides exceed 30 ppm and the oven is used more than 8 hours during the day in steam or combination mode the cavity will require rinsing every 8 hours. Failure to do so will result in corrosion and rusting of the oven cavity and interior parts. A Reverse 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.

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

Appliances equipped with a flexible

electric supply cord are provided with a three prong grounding plug. It is imperative that this plug be connected into a properly grounded three prong receptacle. If the receptacle is not the proper grounding type, contact an electrician. Do not remove grounding prong from this plug.

Electrical and grounding

connections must comply with the applicable portions of the National Electrical Code and / or other local electrical codes.

NOTE: Do not use GFI outlets. The spark ignition can cause electrical noise that can false trigger the GFI detection.

Supply Voltage

Volts Amps Hertz Phase

120 5.0 60 1

Supply Gas Pressure Input

Natural Propane BTU/HR

5" - 14" w.c. 11" - 14" w.c. 80,000

Water Supply

A cold water supply with a flow pressure of 30 to 60 psi is required.

There is a 3/4" garden hose fitting located on rear of machine labeled FILTERED. This inlet must be connected to approved filter system. Failure to connect oven to approved filter system will void warranty.

There is also a 3/4" garden hose fitting located on rear of machine labeled NON-FILTER.

Plumbing Connections

Plumbing connections must comply

with the applicable sanitary, safety and plumbing codes.

Drain Connection

The drain connection must be plumbed with a minimum of 1" air gap. Drain water can not be greater than 140°F, upon discharge. There is a 1" NPT male port for drain. Drain plumbing, not supplied, should have a constant slope towards floor drain. Do not connect solidly to floor or other drains.

Page 5 of 83 F45491 (0714)

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

REMOVAL AND REPLACEMENT OF PARTS

PANELS

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

Right Panel

1. Remove four right panel screws.

2. Lift right panel up and back using handles.

Fig. 2

4. On the right side, remove the screw in the upper right hand corner.

Fig. 1

3. Reverse procedure to install.

Rear Panel

1. Remove Right Panel.

2. Remove two fan screws.

3. Remove six utility panel screws.

NOTE: Bottom 2 utility screws only support utility panel and can be left assembled.

F45491 (0714) Page 6 of 83

NOTE: Gas Unit shown.

5. Remove four rear panel screws.

NOTE: Hold onto one panel handle to prevent rear panel from falling.

6. Lift with handles to remove.

7. Reverse procedure to install.

Left Panel

1. Remove Right Panel.

2. Remove Rear Panel.

3. On the left side, remove the screw in the upper

4. Lift left panel up and back towards the rear of the

Fig. 3

left hand corner.

unit.

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

Fig. 4

5. Reverse procedure to install.

INNER DOOR

1. Open oven door.

2. Unlatch inner door using inner door latch.

Fig. 5

Fig. 6

4. Place inner door in a secure location to prevent damage.

5. Reverse procedure to install.

INNER DOOR LATCH

1. Remove upper door stiffener screws and remove upper door stiffener.

3. Lift inner door up off door hinge.

Fig. 7

2. Remove inner door latch screws.

Page 7 of 83 F45491 (0714)

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

Fig. 8

3. Reverse procedure to install.

4. Check for proper operation.

DOOR LAMP

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.

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

1. Remove

2. Insert screwdriver in slot just above the screw.

INNER DOOR.

Fig. 9

Fig. 10

5. Reverse procedure to install.

DOOR LATCH

The oven and its parts are hot. Use

care when operating, cleaning or servicing the oven. The cooking compartment contains live steam. Stay clear when opening door.

Door Cam

1. Open door and remove

2. Remove door lock cover.

INNER DOOR.

3. Push in tab to free the glass cover from lamp holder

4. Grasp lamp using cloth and remove from lamp socket.

3. Remove cam screw and washer.

F45491 (0714) Page 8 of 83

Fig. 11

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

4. Press torsion springs ends together to unlatch from the door lock clamp bracket.

Fig. 12

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.

DOOR SWITCH

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

1. Remove CONTROL PANEL.

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.

Fig. 14

2. Remove back control panel.

3. Remove lock nuts.

Fig. 13

3. Remove hex socket screws (x4).

4. Latch spring and wear latch plate are now accessible for replacement.

5. Reverse procedure to install.

6. Check for proper operation.

Fig. 15

4. Slide reed switch out from control switch bracket.

5. Remove reed switch screws.

6. Reverse procedures to install.

7. Check for proper operation.

Page 9 of 83 F45491 (0714)

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

CONVECTION FAN MOTOR

Certain components in this system are

subject to damage by electrostatic discharge during field repairs. A field service grounding kit is available to prevent damage. The field service kit must be used anytime the control board is handled.

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

NOTE: When using gear puller to remove convection fan, do not use factory stainless steel cap screw or damage to the screw head may occur. Use a spare M6 cap screw as listed under

Convection Fan

1. Remove Right Panel.

2. Remove Rear Panel.

3. Remove humidity hose clamp.

Convection Fan Motor

4. Remove CONVECTION FAN BAFFLE.

5. Remove humidity cavity nozzle nuts to remove humidity cavity nozzle.

NOTE: Replace nozzle gasket if necessary.

Tools.

Fig. 17

NOTE: Gas Unit shown.

6. Remove socket head cap screw.

Fig. 18

NOTE: Gas Unit shown.

7. Remove atomizer bolt.

NOTE: Atomizer bolt is a left handed bolt. Turn clockwise to remove.

8. Remove water atomizer.

9. Thread atomizer bolt by hand into convection fan motor shaft. Leave approximately 1/8" space between hex head on left hand thread atomizer bolt and convection fan hub.

10. Insert spare M6 cap screw into convection fan motor shaft. Hand tighten only.

F45491 (0714) Page 10 of 83

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

Fig. 19

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.

5. Lift baffle up off baffle hangers.

NOTE: Verify convection fan baffle is lifted over bottom and top rack guide supports.

Fig. 20

6. Pull towards front of oven to remove.

7. Reverse procedures to install.

13. Disconnect motor wires from convection fan terminal block.

Convection Fan Terminal Block (TB2)

Connection Call-outs

A TB Block Number

White 10

Blue 9

Black 8

Red 7

Brown 6

Brown 5

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.

NOTE: Verify convection fan baffle is hooked on top baffle hangers and supported behind the bottom baffle support guides.

Fig. 21

NOTE: Gas Unit shown.

MAIN CONTROL BOARD

Certain components in this system are

2. Remove left and right oven rack holders.

3. Lift baffle up off bottom baffle supports.

4. Lift baffle over bottom rack guides.

1. Check customer's current parameter settings.

Document customers parameter settings.

Page 11 of 83 F45491 (0714)

CONFIGURATION MODE (1972) for

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

NOTE: This step can only be accomplished if main control board is still operational.

NOTE: Oven hour counter (P18), water counter values (P19, P20), and error log will start new, with replacement main control board.

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

2. Remove Right Panel.

3. Remove electrical connections from main control board and oxygen sensor board.

4. Remove main control board.

6. Refer to CALIBRATING OXYGEN SENSOR BOARD.

7. Check for proper operation.

OXYGEN SENSOR

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

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

2. Remove Rear Panel.

Right Panel.

Fig. 22

NOTE: Squeeze nylon standoffs to release board.

5. Remove OXYGEN SENSOR BOARD from main control board.

Installation of Replacement Control Board

1. Install OXYGEN SENSOR BOARD onto replacement main control board.

NOTE: Oxygen sensor board is easier to install onto main control board before installing main control board.

2. Line up holes on new main control board with nylon standoffs (x10).

3. Press board onto standoffs.

3. Disconnect oxygen sensor cable at plug.

NOTE: Do NOT disconnect cable from Oxygen Sensor Board.

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.

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.

F45491 (0714) Page 12 of 83

6. Reverse procedures to install.

7. When installing, wire tie oxygen sensor cable as

Fig. 23

previously installed.

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

Oxygen Sensor cable can not lay on the

bottom of the oven.

Oxygen Sensor cables are sensitive to

electrical noise and must be routed away from other wires.

8. Power unit on.

9. CALIBRATING OXYGEN SENSOR BOARD.

10. Check for proper operation.

OXYGEN SENSOR BOARD

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

Certain components in this system are

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.

Fig. 25

2. Secure using screws from replaced board.

3. Power on unit.

4. CALIBRATING OXYGEN SENSOR BOARD.

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.

5. Check for proper operation.

FERRITE

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

1. Remove

2. Lift ferrite clip with flat screw driver (2 places).

Right Panel.

Fig. 24

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.

Fig. 26

3. Reverse procedures to install.

Page 13 of 83 F45491 (0714)

ABC Combi Gas 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.

Fig. 28

5. Replace motor control board.

6. Reverse procedure to install.

Fig. 27

MOTOR CONTROL BOARD

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

Certain components in this system are

1. Remove

2. Document wire locations.

3. Remove electrical connections from board.

4. Remove motor control board. (4 Nylon screws)

Right Panel.

7. Check for proper operation.

CONTROL PANEL

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

Certain components in this system are

Control Panel

1. Remove Right Panel.

2. Disconnect multi pin connectors.

3. Disconnect control board ribbon cable.

F45491 (0714) Page 14 of 83

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

Fig. 29

4. Remove ribbon cable wire tie.

NOTE: Replace wire tie on install.

7. Place control panel on a clean, flat surface.

8. Place in a secure location.

Do NOT place control panel flat on knobs.

Doing so will cause damage to encoders.

Fig. 32

9. Reverse procedures to install.

NOTE: The motor control board ribbon cable will fit in J1 as well as J8, make sure it gets plugged in to J1 on Main board.

Fig. 30

5. Remove 6 recessed control panel screws.

10. Verify proper operation.

ON / OFF SWITCH

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

On / Off Switch

1. Remove

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 PANEL from unit.

Fig. 31

6. Lift control panel up off hooks.

NOTE: Carefully pull connector and ribbon cable through hole when removing control panel.

Fig. 33

3. Remove screws from back of control base panel.

Page 15 of 83 F45491 (0714)

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

Fig. 34

NOTE: Use care when removing back of control panel

cover. Wires are attached.

Certain components in this system are

4. Unplug wires from back of On/Off switch

DISPLAY BOARD

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

Certain components in this system are

Display Board

1. Remove

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 PANEL from unit.

Fig. 35

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.

7. Check for proper operation.

Fig. 36

3. Remove screws from back of control base panel.

Fig. 37

NOTE: Use care when removing back of control panel

cover. Wires are attached.

F45491 (0714) Page 16 of 83

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

Certain components in this system are

4. Remove display board ribbon cable.

5. Remove encoder ribbon cables.

6. Remove display board nuts.

CONTROL PANEL COOLING FAN

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

Certain components in this system are

Display Board Fan

1. Remove

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 PANEL from unit.

Fig. 38

7. On the new display board, make sure that jumper J5 on the back of the display board is installed and on the correct two pins. (The two closest to the edge of the board.)

Fig. 39

8. Reverse procedures to install.

9. Check for proper operation.

Fig. 40

3. Remove screws from back of control base panel.

Fig. 41

4. Disconnect cooling fan wire connection.

5. Remove cooling fan nuts.

Page 17 of 83 F45491 (0714)

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

Fig. 42

6. When installing fan, verify arrows are facing the correct direction.

Fig. 44

REAR COOLING FAN

NOTE: Air to exhaust out of control panel.

Fig. 43

7. Reverse procedure to install.

8. Check for proper operation.

CONTROL BOX COOLING FAN

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

1. Remove

2. Remove two wires going to fan.

3. Remove nuts securing fan to frame.

4. Reverse procedure to install.

5. Check for proper air flow.

Rear Panel.

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

1. Remove Right Panel.

2. Unplug two wires going to fan.

3. Remove two screws securing fan to frame.

4. Reverse procedure to install.

5. Check for proper air flow.

F45491 (0714) Page 18 of 83

Fig. 45

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

KNOB & ENCODER

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

Certain components in this system are

Control Knob & Encoder

1. Remove

2. Place control panel in a secure location.

NOTE: Do NOT place control panel flat on knobs. Doing so will cause damage to encoders.

3. Remove control base panel.

4. Disconnect encoder ribbon cables.

CONTROL PANEL.

Fig. 46

Fig. 48

6. Remove encoder nut to remove encoder.

7. Reverse procedures to install.

NOTE: Tapped hole needs to be aligned with flat part of encoder.

8. Check for proper operation.

HI-LIMIT THERMOSTAT

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

1. Remove hi-limit thermostat screws.

Fig. 47

5. Loosen set screw in tapped hole on knob.

Fig. 49

NOTE: Gas Unit shown.

2. Remove hi-limit thermostat probe.

NOTE: Hi-limit thermostat probe is located on top of unit, under insulation.

Page 19 of 83 F45491 (0714)

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

NOTE: Turn Probe Mounting Screw quarter turn to loosen. Do not remove probe mounting screw and bracket.

Fig. 52

NOTE: Gas Unit shown.

Fig. 50

3. Reverse procedures to install.

NOTE: When installing hi-limit thermostat verify hilimit shaft is turned clockwise until it stops.

Fig. 51

4. Check for proper operation.

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 assembly to back of cavity.

CAVITY INTAKE TUBE ASSEMBLY

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

1. Remove Rear Panel.

2. On right side of unit, disconnect plug P3.

F45491 (0714) Page 20 of 83

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 .

Fig. 53

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

CAVITY VENT MOTOR

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

1. Remove Rear Panel

2. Remove CAVITY INTAKE TUBE ASSEMBLY.

3. Rotate damper camshaft until set screw faces the rear of the cavity intake tube assembly.

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

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

1. Remove Rear Panel.

2. Remove wires going to cavity vent switches.

Fig. 54

4. Loosen set screw.

5. Remove two screws securing the vent motor to the frame.

6. Pull motor free from assembly.

7. Insert blade of small screwdriver into wire nuts to release motor wires.

Fig. 56

3. Remove bottom screw securing switches to frame.

Fig. 55

Page 21 of 83 F45491 (0714)

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

Fig. 57

4. Loosen top screw and remove switches from frame.

5. Replace switch or switches as needed.

6. Reverse procedure to install.

3. Remove gas line from gas valve.

4. Remove high voltage ignitor cable from ignitor.

5. Remove flame sensor wire from flame sensor.

6. Remove manifold screws from burner.

7. Remove gas valve from manifold.

7. Attach wires to switches.

Fig. 58

8. Perform CAVITY VENT SWITCH TEST AND ADJUSTMENT .

GAS VALVE

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

Fig. 59

8. Reverse procedures to install.

NOTE: Make sure the switch on the gas valve is turned on.

Fig. 60

9. Check for proper operation.

IGNITOR

Certain components in this system are

1. Remove Right Panel.

2. Remove wires from gas valve.

F45491 (0714) Page 22 of 83

Ignitor Removal

1. Remove

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

Right Panel .

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

2. Disconnect high voltage cable from ignitor.

Fig. 61

3. Remove ignitor screw.

4. Pull ignitor to remove.

5. Reverse procedures to install.

NOTE: Make sure to keep the high voltage cable routed separately from flame sensor cable (wire 206) and the ground wire (wire 205).

FLAME SENSOR

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

Flame Sensor Removal

1. Remove Rear Panel .

2. Disconnect flame sensor cable (wire 206) from flame sensor.

3. Remove flame sensor screw.

4. Pull flame sensor to remove.

Fig. 62

6. Check for proper operation.

Fig. 63

5. Reverse procedures to install.

NOTE: Make sure to keep high voltage cable routed separately from flame sensor cable (wire 206) and the ground wire (wire 205).

Page 23 of 83 F45491 (0714)

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

3. Remove burner ground screw from burner.

4. Remove burner screws to remove burner.

5. Remove burner seal.

NOTE: A scraper can be used to remove burner seal.

Fig. 64

6. Check for proper operation.

BURNER

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

1. Remove manifold screws.

2. Gas valve, gas line, and manifold can be place aside.

NOTE: It is not necessary to remove gas line. Gas line can be used to hold gas valve and manifold assembly.

Fig. 66

6. Reverse procedures to install.

7. Check for proper operation.

INDUCER BLOWER

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

1. Remove

2. Remove Rear Panel .

3. Disconnect inducer blower wires.

INDUCER BLOWER

BLACK 211 (Black)

WHITE 213 (White)

RED 212 (Red)

Right Panel.

WIRE HARNESS

4. Remove motor shroud screws.

5. Lift up and towards front of unit to remove.

Fig. 65

F45491 (0714) Page 24 of 83

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

HEAT EXCHANGER ASSEMBLY

electrical power to the machine and follow lockout / tagout procedures.

1. Remove Right Panel.

2. Remove Rear Panel.

3. Remove INDUCER BLOWER.

4. Remove insulation above inducer blower.

5. Remove insulation to left of inducer blower.

NOTE: Retain insulation to reinstall after repairs.

6. Insert 2x4 board between heat exchanger and bottom of cavity.

Disconnect the

Fig. 67

6. Remove air pressure hose.

7. Remove gas flue screws.

8. Remove gas flue from rear of unit.

9. Lift up and back to remove.

10. Remove inducer blower screws.

Fig. 68

11. Pull to remove inducer blower.

Fig. 69

7. Support gas valve / burner assembly with a block of wood.

12. Remove any excess inducer blower seal before replacing seal.

13. Reverse procedures to install.

14. Check for proper operation.

Page 25 of 83 F45491 (0714)

Fig. 70

8. Remove mounting plate nuts.

9. Remove burner assembly nuts.

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

Fig. 71

10. Pull to remove heat exchanger.

NOTE: Check heat exchanger gasket for proper sealing.

11. Replace heat exchanger gasket.

4. Remove screws securing pressure switch.

5. Reverse procedure to install.

IGNITION MODULE

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

1. Remove Right Panel.

2. Remove high voltage cable.

12. Reverse procedure to install.

13. Check for proper operation.

DRAFT INDUCER PRESSURE

SWITCH

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

1. Remove Right Panel.

2. Remove leads from pressure switch.

Fig. 73

3. Remove wires.

Ignition Module

S1 Remote Flame Sensor 206

GND System Ground 205

V2 Valve Ground 207

24VAC 24 VAC Supply 209

L1 120 VAC Input (hot) 203

IND Inducer Blower (output) 204

V1 Valve Power (Output) 208

PSW Pressure Switch Input 201

TH / W Thermostat Input 200

FC+

FC-

Description

Alarm (normally closed

contact)

Flame Current Test

Pins

Wire

Number

225

None

4. Remove ignition module screws.

Fig. 72

3. Remove tube from pressure switch.

F45491 (0714) Page 26 of 83

5. Reverse procedure to install.

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

TRANSFORMER

electrical power to the machine and follow lockout / tagout procedures.

1. Remove Right Panel.

2. Disconnect Plugs 7 and 8 going to Transformer.

Fig. 74

Disconnect the

NOTE: Make sure to keep the high voltage cable routed separately from flame sensor cable (wire 206) and the ground wire (wire 205).

Fig. 76

3. Remove two nuts on the left hand side of transformer bracket.

Fig. 75

6. Check for proper operation.

Fig. 77

4. Remove nut on the right hand side of transformer bracket.

Page 27 of 83 F45491 (0714)

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

Fig. 78

CAUTION Transformer weighs 12.5 pounds and

has a strong magnetic pull to the frame of oven.

Fig. 80

8. Replace transformer.

9. Reverse procedure to install.

5. Slide transformer off of studs and down to the bottom of the oven.

Fig. 79

6. Remove transformer and bracket from oven.

7. Remove nut and washer securing transformer to bracket.

TEMPERATURE SENSOR (RTD1)

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

1. Remove Right Panel.

2. Remove Rear Panel.

3. Remove wire ties attaching wires going to temperature sensor to the oxygen sensor cable.

4. Remove black wire from TB2-3 and red wire from

NOTE: Insert small screwdriver in square next to the wire to release the wire from terminal block.

F45491 (0714) Page 28 of 83

Fig. 81

TB2-4.

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

Fig. 82

5. Push back installation to get access to the nuts securing the probe.

3. Remove two screws securing valve to utility panel.

Fig. 84

NOTE: Gas Unit shown.

4. Remove two wires going to valve.

Fig. 83

6. Remove the two nuts.

7. Remove temperature sensor RTD1 from unit.

8. Install new probe.

9. Reverse procedure to install.

NOTE: Attach wire ties in same spots as before.

DRAIN WATER CONDENSATE

VALVE

5. Loosen hose clamp and pull valve free of hose.

Fig. 85

6. Replace valve.

7. Reverse procedure to install.

DRAIN WATER THERMOCOUPLE

electrical power to the machine and follow lockout / tagout procedures.

1. Remove

2. Remove Rear Panel.

Right Panel.

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

1. Remove

2. Loosen screws for terminal TC1 and remove wires.

Page 29 of 83 F45491 (0714)

Right Panel.

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

Fig. 86

3. Cut cable ties securing wires going to drain water thermocouple.

4. Loosen nut securing the thermocouple.

7. Reverse procedure to install.

HUMIDITY VALVE

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

1. Remove Right Panel.

2. Remove Rear Panel.

3. Remove two screws securing humidity valve to utility panel.

Fig. 87

5. Pull thermocouple from housing.

Fig. 88

6. Replace thermocouple.

Fig. 89

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.

F45491 (0714) Page 30 of 83

ABC Combi Gas Oven - REMOVAL AND REPLACEMENT OF PARTS

Fig. 90

6. Loosen the two hose clamps securing the valve and free the valve from the two hoses.

Fig. 91

7. Replace valve.

8. Reverse procedure to install.

Page 31 of 83 F45491 (0714)

ABC Combi Gas Oven - SERVICE PROCEDURES AND ADJUSTMENTS

SERVICE PROCEDURES AND ADJUSTMENTS

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.

3. 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.

A. Timer display will flash "1972".

B. Timer and Humidity display will flash twice.

C. Humidity display changes from "PAS" to "CFg" when logging into Configuration Mode.

D. Temperature Display will go to P0, 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 is the last address, the counter will continue to go higher, but the Time display and the Humidity display will be blank.

3. Turn the Humidity Knob to change the values as needed.

4. The following chart list the options for each address.

F45491 (0714) Page 32 of 83

ABC Combi Gas Oven - SERVICE PROCEDURES AND ADJUSTMENTS

Temp.

Display

("---")

Current firmware code revision (Month,

P1 Set temperature to Fahrenheit or Celsius. UnIt F or C

day, year). Time and Humidity show example.

Temperature knob increments.

Temperature increment can be adjusted by 1, 5, or 10 degrees.

Humidity knob increments.

Humidity can be adjusted by 1 or 10 percent increments.

Custom Operator Interface

Factory Default UI Setting FACt

Custom UI Setting CUSt

NOTE: Operator can flip between P4 FACt and P4 CUSt. Custom settings will be remembered.

Description

Time Display

("----")

0225

(Month: 02, Date: 25)

tInC 1, 5, 10, 25

HInC 1 and 10

Humidity Display

("---")

(Year: 2014)

Letter after number = Rev

within date

Turn Hum knob between

Factory (FACt) and Custom

(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 set to custom can

settings in P5 and P6 be configured.

FACt

CUSt

(Indicates customer settings are currently loaded.)

ALL

80 (min)

... 482 (max)

SEt

Turn knob to edit custom settings.

TIP: Select “ALL on” to begin customizing if minimal changes needed to FACt settings.

oFF

TIP: Select “ALL oFF” if you want to start customizing from scratch.

oFF / on

Hum knob can be toggled to change individual temperature on or off.

Page 33 of 83 F45491 (0714)

ABC Combi Gas Oven - SERVICE PROCEDURES AND ADJUSTMENTS

Temp.

Display

("---")

Define Humidity Selection in UI

NOTE: Only when P4 is set to custom can

settings in P5 and P6 be configured.

NOTE: 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.

3. Toggle Hum knob oFF.

4. Scroll timer knob to temperature of 212.

5. Toggle humidity knob to on.

6. Scroll timer knob to 325.

7. Toggle humidity knob to on.

8. Turn Temperature knob to P6.

9. Scroll timer knob to 325.

Description

Time Display

("----")

Turn Timer knob through temperature choices.

FACt

80 (F)

482(F)

Turn Timer knob through temperature choices.

CUSt

ALL oFF

212(F) on

325(F) on

212(F)

Humidity Display

("---")

90 (% humidity)

0 (%)

Hum knob can be used to change humidity mapping to selected temperature.

100(%)

10. Toggle knob to 0%

11. At completion, user interface is customized so user can only select 212F @ 100% or 325F @ 0%

End of example.

F45491 (0714) Page 34 of 83

Allows users to manual adjust humidity settings during operation.

Oven Buzzer

ON - Buzzer stops after 5 seconds.

OFF - Buzzer turns on until door is opened or timer is turned off.

Door Lights

ON - Door lights flash at end of timer countdown.

325(F)

0(%)

HAdJ on / oFF

b 5 on / oFF

FLSH on / oFF

ABC Combi Gas Oven - SERVICE PROCEDURES AND ADJUSTMENTS

Temp.

Display

("---")

OFF - Door lights do not flash at end of countdown.

Batch Timer.

Timer recalls last operated value when door is open and closed after buzzer.

P10

P11

P12 Convection Fan Speed. (not adjustable) FSPd 7

P13

P14

P15

User does not need to reset timer.

For example, User removes a batch of fries from oven and puts in a second batch of fries.

Clean reminder.

"CLn good bYE" shown when on/off switch is toggled off.

Convection Fan Breaking Speed. (not adjustable)

Reversing fan timing.

Number of minutes cavity fan turns before breaking and turning in opposite direction.

Define maximum temperature knob setting in UI.

Maximum temperature that can be set by user. Minimum setting limited by P16.

Define minimum temperature knob setting in UI.

Description

Time Display

("----")

trCL on / oFF

CLn on / oFF

F br 5

FrEU Off, 1 , 2, 3, 4, 5

t_HI 80 thru 450 increments of 10.

Humidity Display

("---")

P16

P17

P18

Minimum temperature that can be set by user. Maximum setting limited by P15.

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 intake is opened "selected" seconds before end of timer countdown.

NOTE: Steam reduction is not engaged 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.

Oven hour counter. Total hours oven has been cooking.

Page 35 of 83 F45491 (0714)

t_Lo 80 thru 450 increments of 10.

AUto oFF, 30, 60, 90

oVEn / 0009 HrS / 999

ABC Combi Gas Oven - SERVICE PROCEDURES AND ADJUSTMENTS

Display

P19

P20

Temp.

("---")

Description

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.

NOTE: Counters will zero when Main I/O board is replaced.

NOTE: Add P19 & P20 for total water usage.

Condensate tempering water counter. Total amount of water used to cool drain water in gallons.

NOTE: Counters will zero when Main I/O board is replaced.

Time Display

("----")

HUn / 0009 gAL / 999

Cond / 000 gAL / 00

Humidity Display

("---")

P23

P24

P25

P26

NOTE: Add P19 & P20 for total water usage.

Demo Mode

Used for sales. All functions operable except for heat.

Disables critical errors.

NOTE: Display will show "ABC trY it" after on/off switch is turned off.

Temperature calibration (Temperature Offset)

Refer to TEMPERATURE CALIBRATION in service and adjustment procedures.

Maximum drain discharge temp.

Temperature at which to run cooling water into the drain.

Target maximum drain discharge temp.

Temperature at which to stop cooling water into the drain.

dEno on

oCAL

dron

(drain on, cooling water)

droF

(drain off, cooling water)

Turn humidity knob

clockwise for positive offset,

to lower overall cavity

temperature.

Turn humidity knob counter

clockwise for negative offset,

to raise overall cavity

temperature.

-15 thru 15 increments of 1.

Default 0

tC1 =120 thru 160

increments of 1.

140

115 thru 155 increments of 1.

tC1 = 130

F45491 (0714) Page 36 of 83

ABC Combi Gas Oven - SERVICE PROCEDURES AND ADJUSTMENTS

Display

P27

P28

Temp.

("---")

Description

NOTE: P25 and P26 are dependant on

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 & P26.

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 a "---" setpoint. In this mode, vent is forced closed and no humidity water valve operation.

Disabled: Humidity knob choices are set between 0 to 100%.

Time Display

("----")

StPr EnA / d15

AStn EnA / d15

Humidity Display

("---")

P32 Oxygen board calibrate / zero ZEro

Oxygen Sensor Data

Shown in % of Absolute Humidity. This

P33

P35

value will not match the % Relative Humidity value shown on User Interface at oven cavity temperatures < 212°F.

ONLY USED WHEN CALIBRATING OXYGEN SENSOR. (Refer to

CALIBRATING OXYGEN SENSOR BOARD.)

Reset parameters to factory default values.

To reset values to factory default:

1. Turn humidity knob clockwise to YES. Timer display flashes "----".

2. Turn timer knob clockwise to spell "rSET", one letter at a time.

NOTE: Humidity display will read don, when the parameters have been reset.

NOTE: Combine the two

numbers to get 51.2%.

rSET

Turning knob to "yes"

indicates a multi step

procedure.

no / YES

don

NOTE: This will reset P4,5,6 Custom settings

Page 37 of 83 F45491 (0714)

ABC Combi Gas Oven - SERVICE PROCEDURES AND ADJUSTMENTS

Logging out of Configuration Mode 1972

1. Turn Temperature knob counterclockwise until "---" displayed.

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.

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.

2. Open cavity door and keep open.

3. 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 Configuration Mode 1972

1. Turn unit on.

2. Turn Timer knob counterclockwise until Timer displays "SEt".

3. Turn Humidity knob counterclockwise until Humidity displays "PAS".

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

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".

• Convection fan turns on.

NOTE: Oven cavity temperature must be below 100°F.

4. If temperature not less than 100°F / 38°C, timer display toggles cool/xxx°F (xxx°F / xxx°C= current temperature), until temperature is below 100°F / 38°C.

5. Timer display flashes "---" when conditions are ready for calibration.

NOTE: If conditions are not met: ( "P33" less than or equal to 24, cavity temperature less than 100°F / 38°C, with door open, and convection fan up to speed.) Time knob will not enter 0000 and beep.

6. Turn Timer knob clockwise to "0000", one digit at a time.

7. Timer displays "donE" and Humidity displays "yes" when complete.

8. Convection fan turns off.

NOTE: To exit out of calibrating oxygen sensor board before calibrating, turn Humidity knob to "no" or turn Temperature knob to exit.

Oxygen Sensor Board Check

1. Turn Temperature knob clockwise to "P33".

• Timer display should read between 0 and 2.

• Humidity display should read between .00

and .99

NOTE: This value should be near 0%. For example, timer = 2, humidity = .99, represents 2.99%.

Exit out of Configuration Mode 1972

F45491 (0714) Page 38 of 83

ABC Combi Gas Oven - SERVICE PROCEDURES AND ADJUSTMENTS

1. Turn Temperature knob counterclockwise until "---" displayed.

GAS VALVE PRESSURE CHECK

AND ADJUSTMENT

Disconnect the

electrical power to the machine and follow lockout / tagout procedures. There may be multiple circuits. Be sure all circuits are disconnected.

Shut off the gas before servicing the

unit.

Fig. 93

STATIC LINE PRESSURE

1. Remove Right Panel.

Fig. 92

2. Manifold Pressure

A. Open Inlet pressure Tap by turning screw 1

to 2 turns CCW.

B. Attach manometer hose to Inlet pressure

Tap.

C. Reconnect power and turn gas supply on.

D. If static line pressure exceeds 14" W.C. (½

psig) the customer must supply and install a pressure reducing valve to reduce the pressure below the maximum allowable for the valve.

E. Close Inlet pressure Tap by turning screw

CW. until tight.

Disconnect the

electrical power to the machine and follow lockout / tagout procedures. There may be multiple circuits. Be sure all circuits are disconnected.

Shut off the gas before servicing the

unit.

Manifold Pressure

1. Open Outlet pressure Tap by turning screw 1 to 2 turns CCW.

2. Remove the pressure regulator adjustment cap from the main gas valve to access the adjustment screw.

3. Attach manometer hose to Outlet pressure Tap

Page 39 of 83 F45491 (0714)

ABC Combi Gas Oven - SERVICE PROCEDURES AND ADJUSTMENTS

Fig. 94

4. Reconnect power and turn gas supply on.

5. Set Temperature knob to call for heat.

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.

NOTE: Accurate gas pressure adjustment can only be made with the burner on.

NOTE: Turn adjustment screw clockwise to increase the pressure. Turn adjustment screw counterclockwise to decrease pressure.

6. Set Manifold pressure to 3.5" W.C.

NOTE: Always replace the adjustment cap after adjustment and securely tighten to ensure proper operation.

7. Close Outlet pressure Tap by turning screw CW. until tight.

Orifice Sizes

Altitudes Natural Gas L.P. Gas

0 - 1999 ft. # 40 #53

2000 - 2999 ft. # 41 # 54

3000 - 5999 ft. # 42 # 54

6000 - 7999 ft. #43 # 54

8000 - 9999 ft. # 44 # 55

Above 10,000 ft. # 45 # 55

Temperature Data Recording Table

Actual

Temperature

Tester

Heater Turn On

________ ________ ________

4. Calculate amplitude. Amplitude = (Turn Off - Turn On). An amplitude of more than 40°F may indicate a problem with heat source. For example, poor combustion, see combustion analysis.

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:

Average

(Turn On +

Turn Off)

divide by 2

Temperature

Tester

Heater Turn off

Natural Gas L.P. Gas

Static Line Pressure

Manifold Pressure

BTU's / Hr 80,000 80,000

F45491 (0714) Page 40 of 83

Min. Max. Min. Max.

5" 14" 11" 14"

3.5" W.C. 10" W.C.

NOTE: Turn humidity knob clockwise for positive offset, to lower overall cavity temperature.

NOTE: Turn humidity knob counter clockwise for negative offset, to raise overall cavity temperature.

A. Enter CONFIGURATION MODE (1972),

scroll temperature knob to P24. Turn humidity knob to enter offset.

ABC Combi Gas Oven - SERVICE PROCEDURES AND ADJUSTMENTS

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. If the 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. To save setting, exit configuration mode by turning temperature knob back to "---" (idle mode) and listen for beep.

8. To recall offset value, enter CONFIGURATION MODE (1972), turn temperature knob to P24. Verify the value set is visible in humidity.

TEMPERATURE in °F RESISTANCE ±5 OHMS

400 887

450 938

COMBUSTION ANALYSIS

1. Verify the manifold pressure as outlined under GAS VALVE PRESSURE CHECK AND ADJUSTMENT.

2. Insert combustion analyzer meter 8" into air sampling tube at aprximately (300°F. ± 50°F.) (149°C. ± 25°C.)for combustion tests.

TEMPERATURE SENSOR (RTD1)

TEST

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

1. Remove

2. Remove probe lead wires from Main I/O board.

3. Test probe with an ohmmeter.

TEMPERATURE in °F RESISTANCE ±5 OHMS

60 530

70 541

80 552

90 563

100 573

125 600

150 627

200 680

250 732

300 785

350 836

Right Panel.

Fig. 95

3. Set oven temperature to 450°F (230°C.) with a burner flame established, take combustion measurements O2 and CO readings.

A. If readings can not be obtained, adjust draft

inducer baffle and retest for combustion.

O2: ( Range 4% to 10%)

CO: Not to exceed 0.04% (400PPM)

NOTE: If combustion readings still can not be obtained, contact Cooking Support.

CAVITY VENT SWITCH TEST AND

ADJUSTMENT

Y10 TEST

Y10 test measures several things. Motor current, conditions of the two vent switches and the time it takes for the two switches to indicate a change for the vent. Each time the test runs, the motor should turn ¼ of a turn. A ¼ 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

Page 41 of 83 F45491 (0714)

ABC Combi Gas Oven - SERVICE PROCEDURES AND ADJUSTMENTS

eight times to make the motor go thru 2 full cycles. If no errors are encountered, the vent switches and vent motor are operating properly.

1. Go into reference.

2. Turn the temperature knob until Y10 comes on 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. If the Timer Display shows "=Err", this means the vent motor did not draw current.

3. Remove wires 44, 45, 46, and 47 from the vent switches

Fig. 97

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)

3. If after 75 seconds the vent switches do not indicate a ¼ has been made the Humidity display shows "Err".

VENT SWITCH ADJUSTMENT

Disconnect the

electrical power to the machine and 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.

Fig. 98

5. Connect a meter set to check resistance to the common terminal and the N.C. contact of switch

Fig. 96

F45491 (0714) Page 42 of 83

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.

ABC Combi Gas Oven - SERVICE PROCEDURES AND ADJUSTMENTS

6. Press the top side of the switches towards the camshaft until the meter indicates an open.

7. Tighten the screws securing the switches.

8. Use the meter to check the common terminal and the N.C. contact of both switches. Both switches at this point should read open.

9. Quick check

A. Connect a meter set to check resistance to

the common terminal and the N.C. contact of switch 1.

B. Using a pair of channel locks rotate the

damper camshaft through one revolution.

C. During one revolution of the Cam shaft, the

meter should indicate continuity at two different spots. These two spots should be 180° from each other.

D. Repeat this check for switch 2

10. Reconnect wires to both vent switches.

11. Reattach panels.

Fig. 99

2. Meter should read .7 volts or higher.

NOTE: If reading is below "0" volts, reverse meter leads and take another reading.

3. Disconnect power and reconnect leads for proper polarity.

FLAME SENSE VOLTAGE TEST

(FENWAL SERIES 35-61)

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.

NOTE: The minimum flame voltage necessary to keep the system from lockout is .7 Volts.

1. Connect a DC voltmeter to FC-FC+ terminals.

4. Check for proper operation.

DRAFT INDUCER TEST

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

1. Using two 1/4" hoses and a T connector, connect an incline manometer inline between the inducer fan and pressure switch.

Fig. 100

2. Log Into Service Mode 1963.

A. Turn unit on.

Page 43 of 83 F45491 (0714)

ABC Combi Gas Oven - SERVICE PROCEDURES AND ADJUSTMENTS

B. Turn Timer knob counterclockwise until

Timer display shows "SEt".

C. Turn Humidity knob counterclockwise until

Humidity display shows "PAS".

1) Timer display will show "2000".

D. Turn Timer display counterclockwise to

1963.

1) Timer display will flash "1963".

2) Timer and Humidity display will flash twice.

3) Humidity display changes from "PAs" to "tst" when logging into Service Mode.

E. Use the temperature knob to advance to

Y16 (Blower /Air Pressure Switch test).

F. Use the Humidity Knob to start the draft

inducer fan.

• The oven should pass the test.

NOTE: The pressure switch requires a minimum of 1" W.C. negative pressure to operate.

• The reading on the manometer should be approx. 3 " WC of negative pressure.

3) Humidity display changes from "PAs" to "tst" when logging into Service Mode.

D. Use the temperature knob to advance to

Y16 (Blower /Air Pressure Switch test).

E. Use the Humidity Knob to start the draft

inducer fan.

• The oven should pass the test.

• Now with the heat exchanger being at 300 °F, the reading on the manometer should be approx. 2 " WC of negative pressure.

7. Exit Service mode.

A. Turn Temperature knob counter clockwise

until "---" is displayed.

DOOR SWITCH ADJUSTMENT

1. In SERVICE MODE (1963), run (Y6) Door test.

NOTE: If the door test reports that the door is open when it is closed it may be because the door reed switch is not lined up with the magnet in the door.

To adjust the door reed switch:

3. Exit Service mode.

A. Turn Temperature knob counter clockwise

until "---" is displayed.

4. Use temperature knob to make the setpoint 300°F.

A. With the burner ignited, the reading on the

manometer should settle approx. 1.6 " WC of negative pressure.

5. Turn temperature knob counterclockwise until "---" is displayed.

6. Log Into Service Mode 1963.

A. Turn Timer knob counterclockwise until

Timer display shows "SEt".

B. Turn Humidity knob counterclockwise until

Humidity display shows "PAS".

1) Timer display will show "2000".

C. Turn Timer display counterclockwise to

1963.

1) Timer display will flash "1963".

Disconnect the

electrical power to the machine and follow lockout / tagout procedures.

A. Remove Right Panel.

B. Remove CONTROL PANEL.

C. Loosen the two screws securing the Reed

Switch to the bracket to adjust the Reed Switch side to side.

2) Timer and Humidity display will flash twice.

F45491 (0714) Page 44 of 83

ABC Combi Gas Oven - SERVICE PROCEDURES AND ADJUSTMENTS

Fig. 101

D. Loosen the two bolts securing the Reed

Switch bracket to the control panel to adjust the Reed Switch up and down.

Page 45 of 83 F45491 (0714)

ABC Combi Gas Oven - ELECTRICAL OPERATION

ELECTRICAL OPERATION

COMPONENT FUNCTION

Main Board ........... Manages all input/output functions of oven as required for combi cook operation. Monitors

oven temp RTD probe, and outputs call for heat to ignition module. Monitors oxygen sensor board and outputs to humidity valves. Monitors condensate tempering thermocouple probe and outputs to condensate valve, monitors door switch and controls cavity lights. Outputs to motor control board to control speed and direction of Convection Fan motor. Rotates the cavity vent intake damper from open/closed using the cavity vent motor output and two cavity vent switch inputs. Monitors on/off switch to change operator interface from sleep/wake mode. Enables cooling fans. Monitors the display board for customer input from knobs, and sends time, temperature, and humidity information to display board. Also monitors ignition module NC output, pressure switch NC contact for ignition errors. Monitors N.O. relay contacts for high limit errors; and monitors oxygen board and motor board for oxygen sensor and convection fan motor errors.

Display Board ........ Processes 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.

Motor Control Board ... 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.

Oxygen Sensor Board ...Heats and controls the oxygen sensor, and reports back oven cavity humidity information

to the Main board. also receives calibration command from Main board.

Oxygen Sensor (SW5) ...Measures the amount of humidity in the oven cooking cavity and is controled by oxygen

sensor board.

Door Switch (SW3) ... Magnetic reed switch it senses the presence of the magnet in the door and closes.

Monitored by the main board which starts stops the cook cycle and activates the lights based on the state of the door switch.

ON / OFF Switch (SW4)

........................

Encoders (SW7, SW8,

SW9) .................

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.

Optically coupled rotary encoder switch that is mounted behind the control knob and sends signal to display board as knob is turned in any direction.

Transformer (T1) ..... Transformer, with 120 VAC input. Multiple secondary voltages are as follows: 230 VAC

to motor board and convection fan motor, vent motor, all water solenoids and cooling fans, 12 VAC oxygen board and oxygen sensor, 12 VAC cavity lamps, 24 VAC main board, motor board (low voltage portion) , vent switches, door switches, high limit sensing contacts, 24 VAC to ignition module and gas valves.

Terminal Block (TB1) ... Incoming voltage supply connection. Transformer to 230 VAC connections.

Terminal Block (TB2) ... Convection Fan Motor (MTR1) and Oven sensor (RTD1) connection.

Terminal Block (TB4) ... Low voltage outputs from transformer connection.

F45491 (0714) Page 46 of 83

ABC Combi Gas Oven - ELECTRICAL OPERATION

Fuse (F1) ............. 4A - Protects Oxygen Sensor Board.

Fuse (F2) ............. 4A - Protects Cavity Light circuit.

Fuse (F3) ............. 4A - Protects main board, motor board (low voltage portion), vent switches, door switches,

high limit sensing contacts

Fuse (F4) ............. 4A - Protects Ignition Module circuit and Relay R4.

Fuse (F7) ............. 6.25A - motor current protection fuse. F7 protects from a malfunction of the motor board’s

on-board reversing relay.

Fuse (F8) ............. 5 A - Protects Oxygen Sensor Board. (Mounted on Oxygen Sensor Board.)

Oven Door Lights (L1,

L2, L3) ...............

Cavity Vent Motor

(Mtr2) ................

Cavity Vent

Open(SW1) ...........

Cavity Vent Closed

(SW2) ................

Humidity Valve Cavity

(Low Flow) (Sol2) ....

Humidity Valve Cavity

(High Flow) (Sol3) ....

Cooling Fans (CF1,

CF2, CF3) ............

Convection Fan Motor

(Mtr1) ................

Oven Sensor Input

(RTD1) ...............

Provides light for the oven cavity (located in door frame). Voltage to light circuit. (12 Volt, 5 Watt Bulbs).

Controls the oven cavity vent intake damper inside the Cavity Vent Intake Tube.

Reports the position (open/closed/spin) of the cavity vent intake damper. Works in conjunction with SW2.

Reports the position (open/closed/spin) of the cavity vent intake damper. Works in conjunction with SW1.

Admits water into the injection nozzle (in a slow stream) that drips onto water atomizer to vaporize the water droplets and provide steam for combi mode or cool the oven temperature.

Circulate air through the oven control panel, display panel, and convection fan motor area for component cooling.

Circulates air through the oven cavity. Is driven by Motor Control Board through capacitor C1. Reverses direction at programed intervals.

Senses oven cavity temperature and is monitored by the Main board.

Air Pressure Switch

(SW6) ................

High Limit (TS1) ...... Removes power from ignition module if oven overheats. The state of the high limit is

Spark Electrode ...... Ignites the gas.

Flame Sense Probe ... Senses the presence of a flame.

Cavity Gas Valve (V1) ... Controls the gas flow.

Ignition Module ...... Controls the inducer blower and gas valve. Generates the spark for burner ignition,

Inducer Blower Motor

(MTR3) ...............

Cold Water Condensate (Sol1) ...

Drain Water Sensor

Input (TC1) ...........

Monitors VACuum created by the draft inducer motor. Prevents burner ignition if a vacuum of 1" W.C. is not present.

sensed by relay R5 which signals Vulcan Main I/o board to display error code.

monitors the pressure switch and the presence of a flame and controls the No ignition light.

When energized, drives fan to generate draft required for proper oven operation, and exhausts combustion products out of flue.

Admits water to p-trap on power up to seal oven cavity. And admits water ptrap to mix with drain water to cool drain discharge water to 140°F before exiting oven.

Monitors drain water temperature and is monitored by the Main board.

Page 47 of 83 F45491 (0714)

ABC Combi Gas Oven - ELECTRICAL OPERATION

Motor Interlock Relay

(R1) ..................

Heat Interlock Relay

(R2) ..................

Oxygen Board Interlock Relay (R3) ...

Inducer Blower Relay

(R4) ..................

High Limit Sense Relay

(R5) ..................

Fan Motor Relay (R6) ... Solid State Relay used to drive the convection fan motor. Is controlled by the motor control

Ferrite ................ Passive electric component used to suppress high frequency noise from the oxygen

Removes power to the motor control board when On/Off switch is Off.

Is used to disable the call for heat signal from the main board to the ignition module when the On/Off switch is Off.

Removes power to the oxygen board and sensor when the On/Off switch is Off.

Used to disable the ignition module and to supply power to the combustion blower in the test mode.

Is used to report the condition of the High Limit Switch to Main Board.

board.

sensor board..

ELECTRICAL PANEL COMPONENT LOCATION

Fig. 102

F45491 (0714) Page 48 of 83

ABC Combi Gas Oven - SEQUENCE OF OPERATION

SEQUENCE OF OPERATION

NOTE: Refer to schematic diagram for the electrical sequence of operation.

Conditions

1. Unit plugged into 120 VAC incoming power supply and is properly grounded.

2. ON/OFF switch (SW4) off.

3. Door switch closed (SW3).

4. High limit switch (TS1) closed.

5. 120 VAC

A. 120 VAC to TB1-9C to:

1) Blower test relay’s COM contact (R4.2).

2) L1 (blower relay) on ignition module.

B. 120 VAC (Com) to TB1-8A to:

1) Inducer blower COM.

C. 120 VAC to Transformer T1 (TB1-9, TB1-8 )

for correct oven voltage on primary input of T1.

1) Transformer step up from 120 VAC to 230 VAC providing voltage for oven components (solenoid valves, motor board (convection fan motor ), vent intake motor, and cooling fans.

2) Transformer steps down from 120 VAC to 24 VAC on two secondaries, 24 VAC and 24 VAC (IM).

a. 24 VAC (IM) providing voltage for

relay coils R4, R5, for high limit switch, and for ignition module and gas valve, call for heat relays.

b. 24 VAC providing voltage for main

bd, motor bd, vent switches, door switch.

3) Transformer steps down 120 VAC to 12 VAC on two secondaries, 12 VAC (Lite) and 12 VAC (Oxy).

a. 12 VAC (Lite) Light providing

voltage for the cavity door lights.

b. 12 VAC (Oxy) providing voltage

for oxygen sensor board and oxygen sensor.

6. 230 VAC

A. 230 VAC from transformer through TB1-6

to:

1) On/Off Switch (SW4).

2) Motor Interlock Relay (R1.2) Common contact.

B. 230 VAC (Com) from transformer through

TB1-3, TB1-4 and TB1-5 to:

1) Cavity Vent (M2).

2) V2 Main Board.

3) Oxygen Interlock relay coil (R3-B).

4) Heat Interlock relay coil (R2-B).

5) Motor Interlock relay coil (R1-B).

6) Motor Interlock relay Common Contact (R1.1).

7) Cold Water Condensate Solenoid 1 (SOL1).

8) Humidity Valve Cavity (Low Flow) Solenoid 2 (SOL2).

9) Humidity Valve Cavity (Hi Flow) Solenoid 3 (SOL3).

10) Cooling Fans (CF1, CF2, and CF3).

7. 24 VAC (IM)

A. 24 VAC (IM) from transformer to TB4-14

through 4A fuse (F4) to:

1) High Limit Switch (TS1).

2) High Limit Sense Relay Coil (R5-A) through TS1.

3) V6 on Main I/O board.

4) V5 on Main I/O board.

B. 24VAC (IM) (Com) from transformer to

TB4-1, TB4-2, and TB4-3 to:

1) High Limit Sense Relay Coil COM (R5B).

2) Gas Valve (V1) COM.

3) V1 (24V COM supply) Ignition Module.

4) V4 (call_ for_ heat common) Main I/O board.

5) V11 (fault detect common) Main I/O board.

Page 49 of 83 F45491 (0714)

ABC Combi Gas Oven - SEQUENCE OF OPERATION

6) Blower Test Relay Coil COM (R4-B).

8. 24 VAC

A. 24 VAC from transformer to TB4-16 through

4A fuse (F3) to:

1) Cavity Vent Switch (SW1-COM).

2) Cavity Vent Switch (SW2-COM).

3) Hi Limit Sense Relay (R5.1-COM).

4) Door Switch (SW3).

5) V9 connection on Main I/O Board.

6) P21 connection on Motor Control/ Reversing Board.

B. 24VAC (Com) from transformer to TB4-5

and TB4-6 to:

1) P22 connection on Motor Control/ Reversing Board.

2) V8 connection on Main I/O Board.

9. 12 VAC (oxy)

A. 12 VAC (oxy) from transformer to TB4

thought 4A fuse F1 to:

A. R2.1 closes, providing 24 VAC (IM) to

Ignition Module, (through R4.1 normally closed contacts).

B. Ignition Module performs a self-check.

Ignition Module light flashes once and enters a thermostat scan state.

C. R2.2 closes allowing the Call_For_Heat

signal input from the Main board to pass to both Ignition module and XH2 pressure switch. (Which is not asserted at this point).

3. R3 oxygen sensor board interlock relay coil (R3) energizes.

A. Providing 12 VAC (Oxy) to Oxygen Board

across J1 (wire42) and J2 (wire 43).

B. D3(amber), D4 (red), D5 (green) LEDs

energized for 2 seconds.

C. D3(amber) LEDs energized for 3 seconds

confirming calibration of electronics on board.

D. D4 (red) LEDs energized for 3 MINUTES

while the oxygen board is heating up the oxygen sensor.

1) Oxygen board interlock relay COM contact (R3.1).

B. 12 VAC (oxy) COM from transformer to TB4

to:

1) Oxygen board interlock relay COM contact (R3.2).

10. 12 VAC (lite)

A. 12 VAC (lite) from transformer to TB4

through 4A fuse (F2) to:

1) V3 (Lamp) on Main board.

B. 12 VAC (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)

1. Motor Interlock relay coil (R1) energizes.

A. Provides 230 VAC across P1 (wire 106) and

P20 (wire 107) on Motor Board.

B. Convection fan motor (M1) energizes.

E. D5 (green) LEDs blinks indicating

transmission of Humidity data from Oxygen sensor board through piggy back connection to Main I/O board.

4. 230Vac 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. Y9 energizes the cold water condensate

Valve (Sol 1) to fill the Ptrap for 6 seconds so cold air does not get sucked up into the cooking cavity through the drain.

D. Y10 Cavity Vent Intake motor (Mtr2)

energizes to close the vent (if previously open).

E. Main I/O board monitor SW1 and SW2 for

the closed position, and de-energizes Y10, cavity vent intake motor.

F. Y13 energizes turning on the cavity lights.

2. Heat Interlock relay coil (R2) energizes.

F45491 (0714) Page 50 of 83

ABC Combi Gas Oven - SEQUENCE OF OPERATION

ON/OFF Switch (SW4) ON & with

Call for Heat

1. Temperature knob turned, to enter Temperature setpoint. Sending signal from SW7 encoder to Main I/O 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 I/O board sends controls signals through the ribbon cable to the motor board.

2. Amber colored LED turns on to indicate that a drive signal is being sent to the external solid state relay.

3. Green colored LED indicates the direction of the motor and toggles its state from on to off (or off to on) 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 Motor (Mtr1) energizes.

Ignition Module (blower test relay R4 off)

1. Y14 call_for_heat relay energizes.

NOTE: On the initial call for heat, a software timer begins to measure "call_for_heat's" on time.

2. Main I/O board reads back the call for heat (momentarily) on XH2 as part of the Error checking routine.

3. Main I/O board monitors the NC fault output from the ignition module as part of the Error checking routine.

4. 24 VAC (IM) is supplied to the TH/W thermostat input on the ignition module.

5. Ignition Module checks pressure switch at PSW input for normally open contacts.

6. Ignition Module energizes IND output and the Combustion blower (MTR3) energizes.

7. Ignition Module checks pressure switch at PSW input for closed contacts.

NOTE: Main momentary signal on Xh2 is now gone and the main board knows the pressure switch has been made.

8. Ignition Module combustion blower pre-purge delay begins and combustion blower removes residual gas from combustion chamber.

9. Ignition Module energizes the gas valve (V1).

10. Ignition Module sparks electrode for 1st trial ignition.

11. Ignition Module detects flame and shuts off spark electrode.

A. If flame is not established after the spark

period.

1) 2nd pre-purge period.

2) 2nd spark.

B. If flame is not established after the 2nd

spark period.

1) 3rd pre-purge period.

2) 3rd spark.

C. If flame is not established after the 3rd spark

period, the module will go into a lock out, and the “RED LED on the ignition module will blink, and NO Heat will show in the Timer display on the oven.

D. Main I/O board detects the Ignition Module

lock out and will reset the ignition module one time by de-asserting and reasserting the call for heat Y14.

E. The Ignition Module will repeat the ignition

sequence up to 3 times again, and if a flame is not detected after this second set of 3 tries, the ignition module will lock out a second time, the RED LED on the ignition module will blink. NO HEAT will show in the timer display.

F. To reset the Ignition Module turn the On/Off

(SW4) off and back on again.

12. Ignition Module continues to energize the Gas valve and combustion blower.

13. Ignition Module continues to monitor the flame sense.

Page 51 of 83 F45491 (0714)

ABC Combi Gas Oven - SEQUENCE OF OPERATION

14. Cavity temperature RTD1 monitored by Main I/O board at XA1 & XA2, and turns off the call for heat when cavity temperature is satisfied.

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, are going to be different. To make up for this, the first time the oven tries to reach setpoint, the control board will keep calling for heat until the temperature at the temperature probe is 50 degrees °F higher than the setpoint. This feature automatically kicks in if the following conditions exist.

1) The temperature setpoint is higher than 250 °F.

2) It takes 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. First time a temperature setpoint

is entered in cook mode.

a) When temperature is set

from "---".

b) When On/Off switch is

toggled and temperature is automatically recalled.

b. When the temperature setpoint is

changed.

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 I/O 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. Y8 Low humidity water valve, SOL2, energizes.

5. Y5 High humidity water valve, SOL3 energizes.

6. Main I/O board monitors SW5, Oven humidity on oxygen sensor , when humidity is satisfied.

NOTE: All humidity setpoints between 0% and 10% are treated as 0% and all humidity setpoints between 90% and 100% are treated as 90%.

A. Y5 Humidity high water valve off.

B. Y8 Low humidity water valve off.

NOTE: If the oxygen sensor is not functioning, oven will enter a “limp along mode” and will steam in an inefficient open loop mode at setpoint between 212 and 220°F, and / or a humidity setpoint of 100%. Both water valves (Y8, SOL2 & Y5, SOL 3) energized continually without regulation.

Hysteresis - Cavity vent intake motor ( during cook cycle).

1. Main I/O board monitor SW5, oven humidity oxygen sensor and compares it to humidity setpoint.

2. Y10 energizes to open the vent (until Main I/O board detects SW1, SW2 open position) when oxygen sensor SW5 > setpoint +10% (for example 80%).

c. When it is detected that the door

goes from being opened to closed in cook mode.

15. Y14 call_for_heat relay de-energizes.

16. Ignition Module de-energizes Gas valve (V1).

17. Ignition Module de-energizes Combustion blower (MTR3).

3. Y10 de-energizes to close the vent (until Main I/

Automatic Venting

1. When Timer counts down to 30 seconds (defined

ON/OFF Switch (SW4) ON & with

Call for Heat & Call for Humidity

Humidification Sequence (blower test relay R4 off)

F45491 (0714) Page 52 of 83

2. Y5 Humidity high water valve off .

3. Y8 Low humidity water valve off.

4. Y10 Cavity Vent Intake motor (MTR2) energizes.

O board detects SW1, SW2 closed position) when oxygen sensor SW5<= setpoint (for example 70%).

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.

ABC Combi Gas Oven - SEQUENCE OF OPERATION

5. Main I/O board monitors SW1 and SW2 for the open position, and de-energizes Y10, cavity vent intake motor.

OTHER SEQUENCES

Timer expires

1. Timer sends a signal from SW8 encoder to Main I/O 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 configuration mode parameter P8).

3. The time function does not control or affect the heating, so the oven will continue to heat after timer 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 call_for_heat_low is off.

2. Y5 Humidity high water valve off.

3. Y8 Low humidity water valve off.

NOTE: At any time in the operation, if door is opened, the Cook timer pauses.

Electronic Motor Break

A. Main board sends controls signals through

the ribbon cable to the motor board.

B. AMBER (L1) and RED (L3) LEDs turn off.

C. 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).

E. Amber colored LED (L1) pulses (faint glow)

to indicate that a break signal is being sent to the external solid state relay.

2. When the drain water temperature is above 140°F.

A. Cold water condensate valve (SOLl1) is

energized, allowing cold water in.

3. When the drain water temperature is below 135°F.

A. Cold water condensate valve (SOL1) is de-

energized.

4. Every two hours, Cold water condensate valve (SOL1), energized for 6 seconds to ensure the Ptrap remains full of water so that cold air can not be sucked into drain and into cooking cavity.

Rapid Cool Feature

1. 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) If the 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.

B. Humidity (high flow) water valve (SOL3) is

energized.

C. Humidity (low flow) water valve (SOL2) is

energized.

2. When the RDT1 temperature drops to within 70°F of the temperature setting.

A. Humidity (high flow) water valve (SOL3) is

de-energized.

B. Humidity (low flow) water valve (SOL2) is

de-energized.

F. The Solid State Relay (R6) pulses.

G. Convection Fan Motor (MTR1),

electronically breaks.

H. Amber (L1) and Red (L3) LED’s off.

I. The Solid State Relay (R6) OFF.

J. Convection Fan Motor (MTR1) energizes.

Cold water condensate sequence

1. Drain water temperature is monitored by Main I/ O board using the drain water sensor TC1.

Page 53 of 83 F45491 (0714)

ABC Combi Gas Oven - CIRCUIT BOARD LAYOUTS

CIRCUIT BOARD LAYOUTS

MAIN BOARD CONNECTIONS

Meter readings for different settings on unit.

NOTE: Temperature knob presets to best set humidity. However, humidity can be adjusted.

Main Control Board Connections

Oxygen Board Connections (Function)

Designation

J1 Wire 42 12 VAC (OXY) input

J2 Wire 43 12 VAC (OXY) (COM)

J3 Cable Wire harness connected to Oxygen sensor (SW5)

Designation Reference Point ON/OFF Switch (OFF) ON/OFF Switch (ON)

J1 J2 O V 12 VAC

Wire number

connected

Function

Oxygen Board voltage readings

F45491 (0714) Page 54 of 83

ABC Combi Gas Oven - CIRCUIT BOARD LAYOUTS

MAIN I/O BOARD CONNECTIONS (FUNCTION)

Designation

J1 Ribbon Cable Ribbon cable connection for Motor Board.

J2 Ribbon Cable Ribbon cable connection for Display Board.

TC+ White wire Condensate tempering probe input

TC- Red wire Condensate tempering probe input

V1 Wire 28 230 VAC input. (From On/Off switch.)

V2 Wire 27 230 VAC (COM) input.

V3 Wire 23 12 VAC (Lite) input.

V4 Wire 228 24 VAC (IM) (COM) input.

V5 Wire 224 24 VAC (IM) input. (Call for heat relay supply voltage)

V6 Wire 16 24 VAC (IM) input. ( Blower test relaysupply voltage)

V7 Wire 13 Chassis Ground input.

V8 Wire 12 24 VAC (COM) input. (Main boad power supply)

V9 Wire 11 24 VAC input. (Main board power supply)

V11 Wire 8 24 VAC (IM) (COM) input.

XA1 Wire 41 Oven Sensor RDT1 input.

XA2 Wire 40 Oven Sensor RDT1 input.

X3 Wire 3 Cavity Vent Switch (SW1) input.

X4 Wire 4 Cavity Vent Switch (SW2) input.

X5 Wire 5 Hi Limit Sense Switch input.

X6 Wire 6 Door Switch input.

X7 Wire 225 Ignition Module Fault detect input.

XH2 Wire 226 Air Pressure Switch input.

Y5 Wire 33 Output for Humidity fill valve (high) relay.

Y6 Wire 34 Output for Cooling Fans (CF1, CF2 and CF3) relay.

Y8 Wire 36 Output for Humidity fill valve (low) relay.

Y9 Wire 37 Output for Condensate tempering valve relay.

Y10 Wire 26 Output for Cavity Vent Intake Motor relay .

Y13 Wire 22 Output for Cavity Light relay.

Y14 Wire 227 Output for Heat relay.

Y16 Wire 17 Output for Service Mode blower test relay.

Wire number

connected

Function

Page 55 of 83 F45491 (0714)

ABC Combi Gas Oven - CIRCUIT BOARD LAYOUTS

Main Board Connection Points (Output Voltage readings)

ON/OFF Switch (ON)

Designation

Y5 V2 0 VAC 0 VAC

Y6 V2 0 VAC 230 VAC 230 VAC 230 VAC

Y8 V2 0 VAC 0 VAC

Y9 V2 0 VAC

Y10 V2 0 VAC

Y13 TB4-9 0 VAC

Y14 V4 0 VAC 0 VAC

Y16 V4 0 VAC 0 VAC 0 VAC 24 VAC

Reference

Point

ON/OFF Switch

(OFF)

Temperature Knob

Set to

"---" (0°F)

230 VAC for 6 seconds when on/off switch turned on.

230 VAC for 15 seconds when on/off switch turned on to close vent.

12 VAC when door is open

Temperature Knob >

80°F

230 VAC as needed

Controlled by temp or humidity settings.

230 VAC as needed when temp is within 50° of setpoint

Controlled by oxygen sensor and humidity setting.

230 Vac for 6 seconds every 2 hours to fill ptrap; and if Drain Water Sensor Input calls for cold water

230 VAC for 15 seconds controlled by oxygen sensor & humidity setting.

12 VAC when door is open

24 VAC when call for heat is needed.

Service Tests

Mode

230 VAC

230 VAC for 15 seconds

12 VAC when door is open

24 VAC during Y17 test.

F45491 (0714) Page 56 of 83

ABC Combi Gas Oven - CIRCUIT BOARD LAYOUTS

MOTOR BOARD

Fig. 104

Page 57 of 83 F45491 (0714)

ABC Combi Gas Oven - CIRCUIT BOARD LAYOUTS

IGNITION MODULE

Fig. 105

Ignition Module Description Wire Number

S1 Remote Flame Sensor 206

GND System Ground 205

V2 Valve Ground 207

24VAC 24 VAC Supply 209

L1 120/240 VAC Input (hot) 203

IND Inducer Blower (output) 204

NC Alarm (normally closed contact) 225

V1 Valve Power (Output) 208

PSW Pressure Switch Input 201

TH / W Thermostat Input 200

FC+

FC-

Flame Current Test Pins None

F45491 (0714) Page 58 of 83

ABC Combi Gas Oven - WIRING DIAGRAMS

WIRING DIAGRAMS

Page 59 of 83 F45491 (0714)

ABC Combi Gas Oven - WIRING DIAGRAMS

TERMINAL BLOCKS and TRANSFORMER

Fig. 106

F45491 (0714) Page 60 of 83

ABC Combi Gas Oven - WIRING DIAGRAMS

MAIN BOARD

Fig. 107

Page 61 of 83 F45491 (0714)

ABC Combi Gas Oven - WIRING DIAGRAMS

MOTOR BOARD

Fig. 108

F45491 (0714) Page 62 of 83

ABC Combi Gas Oven - WIRING DIAGRAMS

IGNITION MODULE

Fig. 109

Page 63 of 83 F45491 (0714)

ABC Combi Gas Oven - WIRING DIAGRAMS

COOLING FANS

Fig. 110

F45491 (0714) Page 64 of 83

ABC Combi Gas 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".

3. Turn Humidity knob counterclockwise until Humidity display shows "PAS".

A. Timer display will show "2000".

4. Turn Timer display counterclockwise to 1963.

A. Timer display will flash "1963".

B. Timer and Humidity display will flash twice.

C. Humidity display changes from "PAs" to "tst" when logging into Service Mode.

NOTE: Humidity knob used to advance.

NOTE: Tests function with door open or closed.

NOTE: For some tests (Y5 - Y13), time display toggles between test number and data reading. For example:

current, temperature, etc.

Page 65 of 83 F45491 (0714)

Temp.

ABC Combi Gas Oven - DIAGNOSTICS / TROUBLESHOOTING

Display

("---")

Current firmware code revision

S5 High limit thermostat status. HILt

S10

S11

rd1 Oven Cavity Temperature (current oven temp) oVn

o 1

(Month, day, year). Time and Humidity show example.

State of Door Switch

Open / Close door to test switch.

State of O/I Switch.

Toggle front panel switch to test.

Electric vs Gas

Auto detects if oven is gas or electric.

Oxygen sensor power.

Verifies 12VAC is supplied to Oxygen Sensor Board.

Description Timer Display ("--:--") Humidity Display ("---")

0225

(Month: 02, Date: 06)

door

AC on / off

tyPE Lo / gAS

o2Pr

HI / CLS (Switch closed)

LO / oPn (Switch open)

HI / CLS (Switch closed)

Lo / oPn (Switch open)

on - Oxygen board is powered.

Err - Oxygen board is not powered.

(Year: 2014)

on/Err

example: 011

o 3

Oxygen sensor board revision number.

Oxygen Board /Oxygen Sensor status

NOTE: Reported as a pair.

orREV

02bd

(If no revision number seen -

power off / on to recognize revision

date)

NOTE: Must be revision 011 or

higher.

O0 / oFF

• Oxygen board not transmitting a status.

• Check connections.

O1 / 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.

O3 / Cal

• Oxygen board can't calibrate itself.

F45491 (0714) Page 66 of 83

• Damaged Oxygen board.

O4 / Cur (Current error)

Temp.

ABC Combi Gas Oven - DIAGNOSTICS / TROUBLESHOOTING

Display

("---")

o 4

Description Timer Display ("--:--") Humidity Display ("---")

Oxygen sensor data

Shown in % of Absolute Humidity. This value will not match the % Relative Humidity value shown on User interface at oven cavity temperatures less than 212°F.

Same value as P33 in CONFIGURATION MODE (1972).

NOTE: Combine the numbers in the two displays to get the complete percentage.

Convection fan Test.

051

Combine the two numbers to get

51.2 %

• Oxygen board can't sense current in oxygen sensor heater.

• Check for disconnected sensor.

1. Checks fan speeds 3 through

Visually check for change in fan speed.

2. Checks current sensing of motor.

Visually check for display to change from IoFF to Ion in Timer display.

3. Checks breaking of motor.

Visually check for convection fan breaking to a stop and not coasting to a stop.

Convection Fan Reverse Test.

Turn humidity knob to initiate test. Note direction of fan. For example, clockwise.

Turn humidity knob to reverse motor. Note direction of fan has changed. For example, counter clockwise.

SPd / Ion

SPd / IoFF

rEV

Ion / IoFF

oFF, 3, 4, 5, 6, 7

HI / Lo

NOTE: Turning humidity knob

too quickly during breaking sequence, will cause oven to beep.

Page 67 of 83 F45491 (0714)

Temp.

ABC Combi Gas Oven - DIAGNOSTICS / TROUBLESHOOTING

Display

("---")

Description Timer Display ("--:--") Humidity Display ("---")

Humidity High flow Water Valve.

When turned on, water will flow out of water atomizer.

NOTE: Valve flow rate = 15 liters / hour (.25 liter / min)

Cooling fans.

Fan 1 (control panel), fan 2 (display panel), fan 3 (oven rear).

H2HI

When on, Timer display toggles

between H2H1 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.

CFAn / (Current Sense value)

When on, Timer display toggles

between CFan and a value to

indicate fans are energized.

Expected value = approximately

99 for 3 fans, 66 for 2 fans.

NOTE: When Timer displays

"=Err", indicates that the fans are

not drawing the proper current.

H2Lo

on / oFF

When on, Timer display toggles

between H2Lo and a value to

Humidity Low flow Water Valve.

When turned on, water will flow

Y10 Cavity Vent Intake VEnt / CLSd Humidity display shows CLS

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).

indicate solenoid is energized.

Expected value = 6 ± 1

NOTE: Wait 10 seconds for

proper value reading in timer

display.

NOTE: When Timer displays

"=Err", indicaes 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", indicaes that the valve is

not drawing the proper current.

on / oFF

F45491 (0714) Page 68 of 83

Temp.

ABC Combi Gas Oven - DIAGNOSTICS / TROUBLESHOOTING

Display

("---")

Description Timer Display ("--:--") Humidity Display ("---")

Current sense and Vent operation test.

1. Checks state of vent switches.

2. Checks rotation of vent motor, quarter turn at a time.

NOTE: Properly check cavity vent intake by turning humidity knob between oPn and CLS a minimum of 4 times to get full rotation.

3. Times rotation of quarter turn, to verify vent switches seat properly on shaft.

4. Checks for current feedback to verify motor is energized.

SPIn / =5

Display toggles. SPIn indicates

switches are in spinning state. "=5"

is an approximate number which

indicates motor is energized

properly.

When complete: VEnt / oPEn

NOTE: "Err/=5", switches are in

an error state, see CAVITY VENT

SWITCH TEST AND

ADJUSTMENT

NOTE: When timer display "=Err" indicates that the vent motor is not

drawing the proper current.

LItE

when on, Timer display toggles

between LItE and a value to

indicate lights are energized.

CLS, turn humidity knob to initiate

test.

Display counts up to 15 seconds, if

operating properly.

When complete: Humidity knob

will read oPn

NOTE: Counts past 15 indicate switches have not seated properly, Err displays after 75 seconds, Test

continues to run.

Y13 Oven cavity door light.

Blower test / Air Pressure Switch.

(Timer display will initially read

Y16

Y17

"FAIL", until blower has successfully turned on and up to speed and pressure switch has been opened. Timer display will then read "PASS".)

Ignition sequence test. (Gas Only)

Resets ignition module faults.

Expected values:

75 for 3 lights

50 for 2 lights

25 for 1 light

0 for no lights on

blo

FAIL / PASS

IGn oFF

blo0 to blo9

rSt0 to rSt9

trY

Turn humidity knob on to initiate

on / oFF

test.

Tests ignition module gas valve pressure switch, induction blower, and spark ignitor.

NOTE: trY1 is the spark from

spark ignitor.

NOTE: If trY does not display, wait

approximately 30 seconds for

Page 69 of 83 F45491 (0714)

Temp.

ABC Combi Gas Oven - DIAGNOSTICS / TROUBLESHOOTING

Display

("---")

HUn gAL

Cnd gAL

Description Timer Display ("--:--") Humidity Display ("---")

Heat test rate of temperature rise.

NOTE: If cavity temperature is above 400°F, oven will beep and turn off test. Turn Humidity knob to turn off beep.

NOTE: If test fails, for example, gas turned off to unit, test will stop and error code will be shown. f error codes generate, refer to ERROR CODES (1963).

Display

Test - assure led light segments operate.

Humidity Water Counter

NOTE: Same value as P19 in CONFIGURATION MODE (1972)

Condensate Tempering Water Counter

NOTE: Same value as P20 in CONFIGURATION MODE (1972).

Cooking Hours

error codes to generate. If error

codes generate, refer to ERROR

CODES (1963).

102F / Heat

115F / PASS

Example: Err Example: E11

Temperature, Timer, Humidity

displays sequence thru dots and

digits 0 - 9.

(Example: ..., 000, 111, etc.)

Example: 0009

tst

When heat test passe, turn

Humidity knob counter clockwise

to turn test off.

oFF / on

Example: 999

Example: Total gallons: 9,999.

Example: 999

Example: Total gallons: 9,999.

NOTE: Same value as P18 in

HRS

LOg (Refer to ERROR CODES )

E0 thru E21

Logging out of Service Mode 1963

1. Turn Temperature knob counterclockwise until "---" displayed.

F45491 (0714) Page 70 of 83

CONFIGURATION MODE (1972).

(Hour counter does not increment in idle mode.)

(Refer to ERROR CODES )

Example: 0009

Example: 999

Example: Total hours: 9,999.

ABC Combi Gas Oven - DIAGNOSTICS / TROUBLESHOOTING

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 "---".

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 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.

Log Into Service Mode 1963

1. Turn unit on.

2. Turn Timer knob counterclockwise until Timer display shows "SEt".

3. Turn Humidity knob counterclockwise until Humidity display shows "PAS".

A. Timer display will show "2000".

4. Turn Timer display counterclockwise to 1963.

A. Timer display will flash "1963".

B. Timer and Humidity display will flash twice.

C. Humidity display changes from "PAs" to "tst" when logging into Service Mode.

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 Timer 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.

Page 71 of 83 F45491 (0714)

ABC Combi Gas Oven - DIAGNOSTICS / TROUBLESHOOTING

There are two ways error codes are stored, sequential log and error bucket.

Sequential log: A quick timed ordered list on errors recorded.

Error buckets: Each bucket, E0...E21, displays an individual error and every hour that the error occurred.

How to read sequential Log

When Log is shown in Temperature display, sequential error log is being displayed. The last stored error is shown in the Timer display. Then the Timer display, in conjunction with the Humidity display toggles the hour count when error occurred.

Sequential Log

1. With Log displayed in the temperature display.

2. Timer Display toggles between E1 and 0009.

3. Humidity display flashing 999

4. Means that an E1 error occurred at cooking hour 9,999.

This is a sequential log. To view the next error recorded, turn Timer knob clockwise. If no more errors have been recorded, Timer displays "ErrS" and Humidity displays "End". If multiple errors have been recorded, "--]" will be displayed in Temperature display when Timer knob is turned. The next error in the sequential log is shown in the Timer display. Then the Timer display in conjunction with the humidity display toggles between error code and hour in which the error occurred.

NOTE: As the sequential log stores multiple error logs, only view the last few error codes to know what errors have occurred to prevent oven from working properly.

How to Read Error Buckets

To view bucket list, turn Temperature knob clockwise to start error buckets, starting at E0. If no errors have been recorded for E0, then Temperature displays "E0 (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 "E0 (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.

E0 .................... High Limit Error (Critical Error): Oven overheats, tripping high limit thermostat, and

removes voltage from ignition module.

E1 .................... Convection Fan Motor Error (Critical Error):Motor Board does not sense current to motor.

Possible causes: 1) Convection fan has overheated and fan's thermal fuse has tripped or 2) motor board's 6-1/4 fuse amp has been blown.

E2 .................... RTD Probe Error(Critical Error): Probe RTD readings are out of range.

E3 .................... (Future Use)

E4 .................... Controls Compartment Ambient Error: Operating temperature of controls has exceed

recommenced temperature limits for more than 15 minutes.

E5 .................... Drain Tempering Probe Error: Drain tempering probe readings are out of range of 32°F

to 250°F range.

F45491 (0714) Page 72 of 83

ABC Combi Gas Oven - DIAGNOSTICS / TROUBLESHOOTING

E6 .................... Convection Fan Current Error: Control board reads current to convection fan motor, when

convection fan should be off.

Error E6 is the only error that can be logged during idle mode

E7 .................... Auto Electric or Gas Detection Error: Control board cannot auto detect type of unit or

state of auto detect pin has changed.

E8 .................... Ignition Error: Ignition Module Error Checking Problem.

1. Ignition module inoperable.

2. Improper sensing of X7 (fault) and XH2 (pressure switch) input to main board.

• Oven "may" heat in this condition, but Combi's Main board cannot sense ignition faults.

E9 .................... Ignition Error: Ignition Module, flame sensed before call for heat.

• Pre ignition error.

• Fenwal Module red light ‘2’ flash.

E10 ................... Ignition Error: Ignition Module Lock Out Fault.

• Pre ignition. Failure to ignite gas after 3 sparks.

• Fenwal Module red light ‘3’ flash.

E11 ................... Ignition Error: Air flow fault 1.

Blower or AP switch problem.

• Pre ignition air pressure not up to speed.

• Fenwal Module red light ‘1’ flash.

E12 ................... Ignition Error: Air flow fault 1 or Control Fault

1. Blower or AP switch problem.

• Post ignition air pressure drops out while burning.

• Fenwal Module Red light ‘1’ flash.

2. Internal control fault inside to Fenwal ignition module.

• Pre ignition

• Fenwal Module Red Light Steady ‘on'.

E13 ................... Ignition Error: Flame dropout Detection

Fenwal re-ignites after gas supply restored

No fault ‘flash’ but oven is not heating in this condition

• Post ignition flame drops out before controller set temperature is satisfied.

E14 ................... (Future Use)

E15 ................... Vent Error: Either vent motor has a problem and cannot rotate, or the vent switches are

out of adjustment and cannot tell vent motor when to stop its rotation at the open or closed position. This means the system cannot humidify efficiently. Although switches should seat into position within 15 seconds for a quarter turn, error will not be logged until vent motor runs 75 seconds without completing.

E16 ................... In cook mode, where oxygen sensor / oxygen sensor board has fallen out of its ready

status.

1. Stuck in warming.

2. Communication error.

Page 73 of 83 F45491 (0714)

ABC Combi Gas Oven - DIAGNOSTICS / TROUBLESHOOTING

3. Internal oxygen board heating or calibration error.

E17 ................... (Future Use)

E18 ................... In cook mode, where oxygen sensor board has lost 12V supply.

E19 ................... (Future Use)

E20 ................... Cooling Fan Dropout: Current not sensed in one or more of the cooling fans. Check

cooling fans to ensure fans are functioning properly.

E21 ................... 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

the current cooking hour is and what cooking hour the error code was recorded.

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 ABC7 oven is to be serviced, the service tech starts by running the all the test in SERVICE MODE (1963). and to look at the in the error log to make note of any recent error codes that have been saved.

Troubleshooting using Error Codes

Check which ERROR CODES are logged.

NOTE: When an error has been corrected, that error code still remains in the log. It is important to note what

Example

1. The current number of cooking hours on the oven is 100.

NOTE: Temperature display shows HRS, Timer display is flashing 0000 and the humidity display is flashing 100.

2. The school uses the oven 6 hours a day.

3. Error E1 happened at hour 75.

4. This means the error occurred 4 working days earlier.

F45491 (0714) Page 74 of 83

ABC Combi Gas Oven - DIAGNOSTICS / TROUBLESHOOTING

Error Code

Symptom Possible Cause Action

Oven does not operate.

When the error occurs the oven shuts down and E0 shows in the temperature display along with a constant error beep.

1. High limit thermostat open.

2. High limit sensing relay (R5).

3. Oven installed with not enough clearance.

4. Fuse F4

1. Verify High limit shaft is turned clockwise until it stops.

2. In Service Mode (1963)

A. Run (S5) to check the current

status of the high limit.

B. Run (rd1) to check the current

temp of the oven cavity.

3. In Configuration Mode (1972).

A. Check the setting of (P15).

1) If the setting of (P15) is set to 482 the high limit must be the 582 degree high limit thermostat.

NOTE: The older version of the high limit thermostat had yellow painted on the tip of the shaft.

4. 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.

Oven does not operate.

When the error occurs the oven shuts down and E1 shows in the temperature display along with a constant error beep.

Oven does not operate.

When the error occurs the oven shuts down and E2 shows in the temperature

1. Convection fan motor is getting too hot and it's thermal overload trips.

2. 6.25 amp fuse (F7) blows on the Motor Drive Board.

3. Cooling fan F3 not running or running in the wrong direction.

4. R1 interlock relay.

5. r6 solid state relay.

6. Motor Drive board.

7. C1 capacitor.

1. RTD Probe.

2. Main board.

1. In Service Mode (1963)

A. Run (F1) Convection Fan test.

B. Run (F3) Convection Fan

reverse test.

C. 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.

2. With no power applied, check to see if the convection fan turns freely.

3. 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.

1. In Service Mode (1963)

A. Run (rd1) to check the reading

from the temperature probe.

Page 75 of 83 F45491 (0714)

ABC Combi Gas Oven - DIAGNOSTICS / TROUBLESHOOTING

Error Code

Symptom Possible Cause Action

display along with a constant error beep.

Oven not operating properly, (Intermittent or erratic).

1. Cooling fan F2 not running or running in the wrong direction.

1) If the reading from the temperature probe reads zero degrees check the resistance of the temperature probe.

1. In Service Mode (1963)

A. 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 F2 is blowing down, drawing air thru the electrical panel.

B. 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.

1. In Service Mode (1963)

A. Run (Y9) Water drain

condensate valve test.

1) When the test is running

1. Drain tempering probe.

E7 A gas oven thinks it's electric. 1. Main board. 1. In Service Mode (1963)

Uses too much water, or does not temper drain water.

Not cooking properly. (Convection fan not working)

2. Water drain condensate valve.

3. Main board.

1. In Service Mode (1963)

A. Run (F1) Convection Fan test.

1. Motor board.

2. Solid State relay.

the Timer display toggles between three things. H2dr which the name of the test, the drain tempering probes temperature reading. and a value that indicates the valve is energized, ( should be a valve of 6 plus or minus 1).

1) Check LEDs on motor board.

• If red LED is on when

the motor is not running, replace motor board.

2) If yellow LED is on and motor does not run, replace Solid State Relay.

F45491 (0714) Page 76 of 83

ABC Combi Gas Oven - DIAGNOSTICS / TROUBLESHOOTING

Error Code

E10

Symptom Possible Cause Action

IGNITION ERROR

1. Ignition module's LED is on steady.

2. No Heat is displayed and there is a dot in the upper left hand corner of the temperature display.

IGNITION ERROR

1. Ignition module's LED 2 flash. (Senses flame before call for heat.)

2. No Heat is displayed and there is a dot in the upper left hand corner of the temperature display.

IGNITION ERROR

1. Ignition module's LED 3 flash. (Fails to ignite or fails to sense flame.)

2. No Heat is displayed and there is a dot in the upper left hand corner of the temperature display.

IGNITION ERROR

1. Wiring problem between main board and pressure switch, or pressure switch and Ignition module.

2. Pressure switch.

3. Ignition Module.

4. Main board.

1. Flame Sensor.

2. Gas Valve.

3. Main board.

1. Gas supply to oven not on.

2. Oven's internal gas valve turned off.

3. Oven's internal gas valve not operating properly.

4. Air in gas supply line.

5. Spark ignitor.

6. Flame Sensor.

7. Ignition module.

A. Run (S11) Auto Detect test.

1. In Service Mode (1963)

A. Run (Y17) Ignition sequence

test to see if burner lites.

1) If the burner lites, check wiring.

2) If burner does not lite, check LED on Ignition module.

a. If LED is steady on

replace Ignition module.

1. In Service Mode (1963)

A. Run (Y17) Ignition sequence

test to see if burner lites.

1) If the burner lites, make sure flame goes out when test is turned off.

2) If operation appears normal but another E9 error comes up, check flame sensor.

1. Check gas supply to oven.

2. Check switch at internal gas valve.

3. In Service Mode (1963).

A. Run (Y17) Ignition sequence

test to see if burner lites.

1) If burner lites.

• Flame sensor.

2) If burner does not lite.

• Spark ignitor.

• Gas valve.

• Ignition module.

1. Ignition module's LED 1 flash. (Pressure switch

E11

E12 IGNITION ERROR

never makes.)

2. No Heat is displayed and there is a dot in the upper left hand corner of the temperature display.

1. Pressure switch.

2. Draft inducer motor.

3. Ignition module.

1. Pressure switch.

2. Draft inducer motor.

Page 77 of 83 F45491 (0714)

1. If the ignition module's LED is doing a 1 flash.

A. Do the DRAFT INDUCER

TEST.

1. If the ignition module's LED is doing a 1 flash.

ABC Combi Gas Oven - DIAGNOSTICS / TROUBLESHOOTING

Error Code

E13

E15

Symptom Possible Cause Action

1. Ignition module's LED is on steady. (Control Fault)

2. Ignition module's LED 1 flash. (Pressure switch drops out.)

3. No Heat is displayed and there is a dot in the upper left hand corner of the temperature display.

IGNITION ERROR

1. Ignition module's LED is off.

2. No Heat is displayed and there is a dot in the upper left hand corner of the temperature display.

Poor cooking, Error dot in the upper left hand corner of the humidity display.

3. Ignition module.

1. Gas Supply problem.

2. Flame Sensor.

3. Ignition module.

1. Vent motor.

2. Vent switches.

3. Vent blocked.

A. Do the DRAFT INDUCER

TEST.

2. Run (Y17) Ignition sequence test to see if burner lites.

A. If burner does not lite, check

LED on Ignition module.

1) If LED is steady on replace Ignition module.

1. Check Gas supply.

2. Run (Y17) Ignition sequence test to see if burner lites.

A. If the burner lites, check flame

sensor.

B. If burner does not lite, check

LED on Ignition module.

1) If LED is steady on replace Ignition module.

1. Perform CAVITY VENT SWITCH TEST AND ADJUSTMENT.

2. Inspect the vent tube to make sure it is not blocked in someway.

In Service Mode (1963).

E16

Does not steam in Combi mode. Error dot in the upper left hand corner of the humidity display.

1. Oxygen sensor.

2. Oxygen sensor board.

3. Main board.

4. Missing Ferrite.

1. Run (o3) Oxygen board / Oxygen sensor status.

O0 / oFF

• Oxygen board not transmitting a status.

• Check connections.

• In Service Mode (1963).

1. Run (o1) oxygen sensor power

test.

• If test passes, (board has power, but can not communicate), replace Oxygen sensor board.

O1 / HT

• Oxygen board is heating the oxygen sensor

• Wait 3 minutes for warming after power is applied.

• Check sensor connections.

F45491 (0714) Page 78 of 83

ABC Combi Gas Oven - DIAGNOSTICS / TROUBLESHOOTING

Error Code

E18

Symptom Possible Cause Action

Does not steam in Combi mode. Error dot in the upper left hand corner of the humidity display.

1. Fuse F1 (fuse link in terminal block.

2. Fuse F8 (on Oxygen board).

3. R3 relay.

• Make sure Ferrite is in place.

• Check routing of cable going to Oxygen Sensor.

• Replace sensor.

02 / rdY

• Oxygen board is transmitting humidity data from sensor.

O3 / Cal

• Oxygen board can't calibrate.

• Replace Oxygen board.

O4 / Cur (Current error)

• Oxygen board can't sense current in oxygen sensor heater.

• Check for disconnected sensor.

• Replace sensor.

1. Check fuses.

1. In Service Mode (1963)

E20 No obvious symptom. 1. Cooling Fan.

Troubleshooting by Symptom NOTE: It is highly recommended that you check the

error log, and run the test available in reference.

A. Run (Y6) Cooling fans test.

1) The Timer display alternates between CFan and a value. A value below 65 means at least one fan is not running.

Page 79 of 83 F45491 (0714)

ABC Combi Gas Oven - DIAGNOSTICS / TROUBLESHOOTING

SYMPTOM POSSIBLE CAUSE

1. Facilities main circuit breaker open.

2. Oven power cord unplugged.

3. Fuse F3

Oven completely inoperative. No display on display board.

Oven does not operate. Display is on.

4. Incorrect wiring of On/Off switch.

5. Ribbon cable going from Main board to Display board not seated correctly.

6. Display board inoperative.

7. Transformer T1 malfunctioned.

8. Control board inoperative.

1. In Service Mode (1963).

A. Check error log for EO, E1, and E2 errors.

NOTE: If any of the 3 errors are logged, follow Troubleshooting using Error Codes.

2. In Service Mode (1963).

A. Run (S6) Door test.

3. Encoder malfunction.

4. Check that the jumper (J5) on back of Display Board is on the correct set of pins.

A. The jumper should be on the two pins closes to the edge of

the board.

NOTE: This is the 5V position.

1. In Service Mode (1963).

Oven operates. Door closed and convection fan inoperative.

Oven operates. Door closed and oven cavity lights inoperative.

Oven operates. Door closed. Oven convection fan operates. Oven does not heat.

A. Check error log for E1errors.

NOTE: If any E1 errors are logged, follow Troubleshooting using Error Codes.

2. In Service Mode (1963).

A. Run (S6) Door test.

1. Reset control by powering oven off and unplugging from the wall outlet. Then restarting.

2. Check fuse F2.

3. In Service Mode (1963).

A. Run (Y13) Oven Cavity door light test.

1) If all cavity light inoperative.

• Check 12 volts from transformer.

• Main Board.

2) If only one light out.

• Halogen light burned out.

1. In Service Mode (1963).

A. Check error log for E8 thru E13 errors.

F45491 (0714) Page 80 of 83

ABC Combi Gas Oven - DIAGNOSTICS / TROUBLESHOOTING

SYMPTOM POSSIBLE CAUSE

Possible error messages on Timer Display.

1. "No Heat"

2. "Door"

Oven cavity vent inoperative.

There is a dot in the upper left corner of the humidity display.

NOTE: Follow troubleshooting called out for the error found.

2. In Service Mode (1963).

A. Run (S6) Door test.

1. Perform CAVITY VENT SWITCH TEST AND ADJUSTMENT.

2. Inspect the vent tube to make sure it is not blocked in someway.

1. Check water supply to unit.

2. In Service Mode (1963).

A. Run (Y5) High Humidity test.

B. Run (Y8) Low Humidity test.

C. Run (S6) Door test.

No steam.

Excessive moisture in oven, or not enough moisture in oven.

D. Run (o1) Oxygen sensor power test.

E. Run (o3) Oxygen Board / Oxygen sensor status test.

3. In Configuration Mode (1972)

• Check the setting of P28, if enabled, "---" in humidity display

during operation means steam is turned off.

4. Inadequate oven preheat. (Oven must be within 50° of setpoint for steam.)

1. In Service Mode (1963).

A. Run (Y5) High Humidity test.

B. Run (Y8) Low Humidity test.

C. Run (Y10) Cavity vent intake test.

D. Run (o1) Oxygen sensor power test.

E. Run(o3) Oxygen Board / Sensor status test.

F. Run (o4) Oxygen Sensor data test.

2. Perform CALIBRATING OXYGEN SENSOR BOARD.

3. Drain clogged or plumbed incorrectly

4. Water pressure regulator malfunction.

1. In configuration Mode (1972).

Incorrect heat / Oven temperature does not match setpoint.

A. Check the settings P1 and P24. See CONFIGURATION

MODE (1972) for details.

2. Perform TEMPERATURE CALIBRATION.

3. In Service Mode (1963).

A. Run (Y5) High Humidity test.

B. Run (Y8) Low Humidity test.

C. Run (F1) Convection Fan test.

D. Run (S6) Door test.

E. Run (Y17) Ignition Sequence test. (Check rate of raise)

Page 81 of 83 F45491 (0714)

ABC Combi Gas Oven - DIAGNOSTICS / TROUBLESHOOTING

SYMPTOM POSSIBLE CAUSE

Uneven Baking.

Temperature of drain water too high.

4. Perform DRAFT INDUCER TEST.

5. Heating circuit malfunction.

NOTE: Remember that the Overshoot feature engages during the first call for heat, and will overshoot the setpoint temporarily.

1. In Service Mode (1963)

A. Run (F1) Convection Fan test.

B. Run (F3) Convection Fan reverse test.

C. Run (Y10) Cavity vent intake test.

2. Check intake vent and exhaust vents for blockage.

3. With no power applied, check to see if the convection fan turns freely.

4. Incorrect air baffle position.

5. Poor seal on door.

1. In Service Mode (1963).

A. Run (Y9) Water drain condensate valve test.

F45491 (0714) Page 82 of 83

ABC Combi Gas Oven - IGNITION CONTROL MODULE TROUBLESHOOTING

IGNITION CONTROL MODULE TROUBLESHOOTING

LED DIAGNOSTIC INDICATOR CODES

LED Code Possible Error Codes

LED "OFF" No Fault None

LED "ON" Control Fault E8 or E12

'1' Flash Air Flow Fault E11 or E12

'2' Flash Flame Fault No Call For Heat E9

'3' Flash Ignition Module Lockout E10

NOTE: LED will briefly illuminate when oven is turned on.

NOTE: Check the error log for any of these

codes.

Page 83 of 83 F45491 (0714)

Vulcan ABC7G User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual