Welbilt MERRYCHEF conneX Service & Repair Manual
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Welbilt MERRYCHEF conneX Service & Repair Manual

Microwave combination oven
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Service & repair manual
Microwave combination oven
Read instructions before use
Part number:
32Z9170
Models: 50Hz & 60Hz
Language: ENGLISH

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Summary of Contents for Welbilt MERRYCHEF conneX

  • Page 1 Service & repair manual Microwave combination oven Read instructions before use Part number: 32Z9170 Models: 50Hz & 60Hz Language: ENGLISH...

  • Page 2: Table Of Contents

    Safe working when testing components Requirements Testing selected components (casing mounted) (5.6) Recommissioning test High voltage components (casing removed) Mains voltage components (casing removed) KitchenConnect components Replacing components Safe working when replacing appliance parts Overview Merrychef conneX service and repair manual ®...
  • Page 3 Removing the convection fan motor speed controller 6.16 Replacing the heating element 6.17 Overview – further components 6.18 Technical data summary sheet Circuit boards and diagrams IO circuit board Circuit diagrams Annual PM check procedure for conneX ® Merrychef conneX service and repair manual ®...

  • Page 4: General Information

    Please see the Installation and User Manual for further details. Quality and environmental management Welbilt UK Limited (Sheffield) employs a quality management system and a certified environmental management system. Please see the Installation and User Manual for further details.

  • Page 5: Identifying Your Microwave Combination Oven

    Elements of the serial number Label Meaning Year of manufacture 2021 22, ... 2022, ... Month of manufacture January 02, ... February, ... Place of manufacture 2130 Sheffield (UK) Production number 12345 Technical data Manufacturer addresses Merrychef conneX service and repair manual ®...

  • Page 6: About This Service And Repair Manual

    This service and repair manual has been written and produced in the UK, following UK and EU standards. Any additional local country standards, outside of the UK, must be understood and adhered to. Merrychef conneX service and repair manual ®...

  • Page 7: For Your Safety

    Interlock operation.  Proper door closing.  Seal and sealing surfaces (arcing, wear, and other damage).  Damage to or loosening of hinges and latches.  Evidence of dropping or abuse.  Merrychef conneX ® service and repair manual...

  • Page 8: Requirements To Be Met By Personnel And Working Positions

    Workwear as specified in country- the task specific standards and directives for kitchen work, in particular: Instructing the user Protective clothing Heat protective gloves (compliant with EN 407 in European Union) Safety boots Merrychef conneX ® service and repair manual...
  • Page 9 Repairs Activity Personal protective equipment All repair work Work wear and personal protective equipment depending on the job that needs doing as specified in national regulations Merrychef conneX ® service and repair manual...

  • Page 10: Intended Use Of The Microwave Combination Oven

    Use only cleaning chemicals that have been approved by the manufacturer.  High-pressure cleaners or water jets must not be used for cleaning.  The appliance must not be treated with alkali or acid solutions or exposed to acid fumes.  Merrychef conneX ® service and repair manual...

  • Page 11: Warning Signs On The Microwave Combination Oven

    Electric shock There is a risk of electric warning shock if the electrical power is not connected to a properly grounded outlet. Merrychef conneX ® service and repair manual...

  • Page 12: Safety Devices

    8 (no Internal high Prevent faulty components from Ensure correct operation picture) temperature generating too much heat and causing thermostats potential fire hazard Merrychef conneX ® service and repair manual...

  • Page 13: Summary Of Hazards

    You must ensure, however, that these safety devices are in place and in working order. The nature of these residual risks and what effect they have are described below. Hazard points The following illustration shows a Merrychef conneX ® microwave combination oven: Excessive microwave energy The microwave combination oven generates microwave energy.

  • Page 14: Safe Working When Working On The Appliance

    Containers, baking sheets, shelf grills etc. cool the cavity. Inside the entire cavity, including all parts that are or were inside during cooking Wear specified protective clothing, in On the inside of the appliance door particular protective gloves. Merrychef conneX ® service and repair manual...
  • Page 15 Risk of body parts When the appliance is being moved e.g., to gain better Always observe the requirements for being crushed if access to the connections the supporting surface the appliance tips over or falls off Merrychef conneX ® service and repair manual...
  • Page 16 & IO boards precautions must be taken, such as oven wearing an ESD wrist strap. IMPORTANT - oven power supply and all capacitors must be proved dead first Merrychef conneX ® service and repair manual...

  • Page 17: Hazards And Safety Precautions When Taking The Appliance

    ‘For your safety’ in the conneX ® Installation and User manual Risk of slipping on In front of the appliance Ensure that the floor around the damp kitchen appliance is dry at all times floor Merrychef conneX ® service and repair manual...

  • Page 18: Safe Working During Electrical Installation

    Note. Residual Current Devices (RCDs) are also known by other terms, such as Earth Leakage Circuit Breakers (ELCBs), Safety Switches, Ground Fault Interrupters (GFIs) and Ground Fault Circuit Interrupters (GFCIs). These should not be confused with over current protection. Merrychef conneX ® service and repair manual...

  • Page 19: Electrical Installation Requirements

    30A models are fitted with YP-91L NEMA 6-30P & HBL2621 NEMA L6- 30P plugs. Connected to a dedicated RCD (GFCI) protected supply, with appropriate circuit breaker as detailed above. Please refer to electrical installation data for other country specific models. Merrychef conneX ® service and repair manual...

  • Page 20: Safe Working When Testing Components

    Make sure that the electrical connections are intact, secure and all equipment panels are re-fitted before you  reconnect the appliance to the power supply Before putting the appliance back into operation, make sure that the appliance, including all metallic accessories, is  connected to an equipotential bonding system. Merrychef conneX ® service and repair manual...

  • Page 21: Process For Discharging The Capacitors

    Repeat on the other set of terminals on the same capacitor. Repeat this process on both HV capacitors for equipment with two magnetrons. Note: the above picture shows the Merrychef approved capacitor discharge tool Merrychef conneX ® service and repair manual...

  • Page 22: Safe Working When Replacing Appliance Parts

    When shifting the appliance into the correct position, use enough people for the weight of the appliance when lifting  it (value depending on age and gender). Observe the local occupational safety regulations. Wear personal protective equipment.  Sharp-edged sheet-metal parts WARNING Risk of cuts from sharp-edged sheet-metal parts. Merrychef conneX ® service and repair manual...
  • Page 23 (wiring) that have been refitted incorrectly. Switch off the oven.  Disconnect/isolate the oven from the electrical supply.  Keep the oven door closed to stifle any flames.  Merrychef conneX ® service and repair manual...

  • Page 24: Technical Data

    2200 2200 2200 2000 heat Rated power output microwave 2000 2000 2000 2000 (IEC 705) 100% Rated power output 2200 + 2000 2200 + 2000 2200 + 2000 2200 + 2000 combination mode Merrychef conneX ® service and repair manual...
  • Page 25 3200 + 2000 3200 + 2000 combination mode Regulatory standards compliance Degree of protection IPX3 Noise emission max. 65 [dBA] Approval marks Tested safety UKCA, CE, CB (IEC), UL Hygiene UL-EPH (NSF/ANSI 4) Merrychef conneX ® service and repair manual...
  • Page 26 Output Voltage 12VDC Check PSM adjustment. (Relay Board) for / 8.5A @ 50 connections LED self-test indicator controller operation. Check IO Board connections X100, X101 and X500 Check input voltage Check output voltage. Merrychef conneX ® service and repair manual...
  • Page 27 Check Live supply potential on VFD Check for consistent output voltage between each phase between Blue (U), Red (V) & Yellow (W) (Digital multi-meter should be set to VAC to conduct this check) Merrychef conneX ® service and repair manual...
  • Page 28 A dirty air filter is a oven shuts down and C (177 major root cause of displays E117, E118. this failure Check IO connections & plugs on X513 & X514 Check IO LEDs LD16 & LD18 Merrychef conneX ® service and repair manual...
  • Page 29 LIVE) Check IO Board Internal discharge connections X403, µ resistor. *(0.95 F see note 3) X410, X411 & X412. Check IO LED 3 & 4. Check Error Log for E101 & E113 events Merrychef conneX ® service and repair manual...
  • Page 30 *Note 3: 0.95 F Capacitors used in most 60Hz applications. Always review country specific service parts lists for required replacements. Never use non-approved alternatives. See section 6.18 for the Technical Data Summary Sheet Merrychef conneX ® service and repair manual...

  • Page 31: Dimensional Drawings

    3 Technical data Back to contents > Dimensional drawings conneX 12 Front view (door closed) Cavity dimensions (door closed) View from the top (door closed) View from the right-hand side (door open) Merrychef conneX ® service and repair manual...
  • Page 32 3 Technical data Back to contents > conneX 16 Front view (door closed) Cavity dimensions (door closed) View from the top (door closed) View from the right-hand side (door open) Merrychef conneX ® service and repair manual...

  • Page 33: Accessing The Easytouch ® 2.0 Screen

    2.0 screen display, layout and icons shown herein are for guidance purposes only and are not intended to be an exact representation of those supplied with the appliance. Full operational details can be found in the Installation and User Manual. Merrychef conneX ® service and repair manual...

  • Page 34: The Keyboard Screen

    For names of cooking profiles, names of cooking profile groups and passwords use 1-20 characters in 2 lines max. For stage instructions of individual cooking profiles use 1-52 characters in 5 lines max. Full operational details can be found in the Installation and User Manual. Merrychef conneX ® service and repair manual...

  • Page 35: Cleaning Procedures

    Do not use caustic cleaners in the oven cavity as they cause permanent damage to the catalytic converters. Do not use tools, sharp implements, or harsh abrasives on any part of the oven. Merrychef conneX ® service and repair manual...

  • Page 36: Using A Usb Stick

    3. Plug in the USB memory stick. 4. Switch the appliance ON. 5A. After the Welbilt start- 5. After the Welbilt start-up screens, the up screens, the oven will oven will display the menu, or choices of display the menu, or menus that can be selected of the USB.

  • Page 37: Firmware Updates

    Ensure that under the resources folder you have an image and sounds folder to store images and sounds, that you would like to upload to the oven. Images formats accepted are: .JPG, .SVG, .PNG Sound formats accepted are: .WAV Merrychef conneX service and repair manual ®...
  • Page 38 USB memory stick is displayed – “Updating…”. DO NOT SWITCH THE OVEN OFF UNTIL COMPLETE Once completed you will be prompted to confirm / alter the language, time & date and Wifi settings. Merrychef conneX ® service and repair manual...
  • Page 39 UI firmware update USB key. 6.To update the UI firmware select the ‘Update UI Firmware’ tab. The firmware will then start updating. Then firmware update sequence remains the same as an automatic update. Merrychef conneX ® service and repair manual...
  • Page 40 After an update of the appliance firmware check to ensure the latest firmware has been successfully loaded on to the oven. Once the oven is switched back on, it will cycle through the Welbilt brand names until reaching the Merrychef “Expanding Your Opportunities”...

  • Page 41: Service Information

     Oven test screen  Temprature calibration screen  Demonstration  Warranty information screen  Select the back arrow at any point to return the previous screen, or to exit the Service Settings. Merrychef conneX ® service and repair manual...

  • Page 42: Errors And Diagnostics

    The ‘cog’ button is selected to enter an abridged Service Settings screen, displaying three selectable tabs; Event Log  Updates  Warranty  See section 5.3 for error code list. Merrychef conneX ® service and repair manual...
  • Page 43 4. A pop up screen confirms completion of the download. Select the grey tick and remove the USB from the appliance. 5. Return to the main menu using the back key on the bottom left- hand corner of the screen. Merrychef conneX ® service and repair manual...
  • Page 44 Magnetron(s) current draw  The diagnostics view screen can be accessed by selected the button in the bottom right of the screen. 4. Selecting ‘Diagnose’ provides a QR code to access further assistance online. Merrychef conneX ® service and repair manual...
  • Page 45 Display colour codes Grey = Normal operation / standby Green = On / OK Blue = Off / OK / Selected Yellow = Warning, out of normal range Red = Warning, switched off Merrychef conneX ® service and repair manual...
  • Page 46 Ambient temperature around the control circuitry  Number of individual recipe cook cycles  Percentage of ambient, chilled & frozen food products cooked  Time breakdown of oven operation by day, week or month.  Merrychef conneX ® service and repair manual...
  • Page 47 (off / 33%, 50%, 75% / 100% / off. 6. Select the convection fan and check if it is operating correctly. When increasing the fan power gradually, in 10% increments, to 100% the fan noise should become louder. Merrychef conneX ® service and repair manual...
  • Page 48 Information at the top of the screen indicates; Demo mode (if selected)  Mode of operation  Cooking programs (changes) locked or unlocked  Wifi connectivity (displayed when unable to  connect) Current time  Merrychef conneX ® service and repair manual...

  • Page 49: Fault Finding

    When the oven switch is switched ON, by tapping the centre of the screen, the display scrolls through the Welbilt brands before settling on the Merrychef Screen. The safety relays energise and then the auxiliary components start running –...
  • Page 50 Merrychef unit while the panels are off. Further information can be found at: merrycheftechnical.com If in doubt, please contact your Merrychef/Welbilt technical support team for support. Note: The event log can be accessed directly during an error condition, without switching the oven off and on, by selecting the settings icon.
  • Page 51 Note: there should be no microwave leakage and corrections to resolve. should be made if any leakage is detected above 0.5mW/cm Check for damaged cavity thermocouple Merrychef conneX ® service and repair manual...
  • Page 52 Can occur on Ensure there are no microwave leaks present around the control boards. IO firmware replacement of error. Please either boards contact your or during Merrychef service incorrect partner to loading of resolve. firmware. Merrychef conneX ® service and repair manual...
  • Page 53 Ensure you counter hold the rear bolt of the element connections before tightening Heater not C within the front nut on the element. responding. 30 minutes Lastly replace IO board Please contact your Merrychef service partner to resolve. Merrychef conneX ® service and repair manual...
  • Page 54 Install a jumper across the front two pins of connection X510 on the IO board. If fault is missing on replacement remains, new IO board required. of new IO board UI displays; E-1 Insert X510 jumper into correct position Merrychef conneX ® service and repair manual...
  • Page 55 No user action registered within 10 seconds. Door switch circuit remained open circuit, check door switches & connections E97: Recommission Door Open Failed No user action registered within 10 seconds. Door switch circuit remained closed circuit, check door switches & connections Merrychef conneX ® service and repair manual...

  • Page 56: Safe Working When Testing Components

    The PAT may indicate an erroneous failure condition depending on its internal "pass"/"fail" settings. Please refer to the revised limits which apply to the specific Merrychef oven model. Model Model maximum limit applied with radio interference filter fitted conneX 12 & 16 10 mA Merrychef conneX ® service and repair manual...
  • Page 57 Never operate an appliance that has failed this test as it could be potentially dangerous. Service settings : Tests Enter Service Settings screen and select ‘Tests’. For details see "Accessing the service information" section 5.1. Select the required individual test for the appliance to perform. Merrychef conneX ® service and repair manual...
  • Page 58 Replace the faulty HV component if required (see High voltage components in section 5.8).  Note: Opening the door during the test will stop the test. Reselect the test to run again. On completion of the test, specify the result by selecting ‘Pass’ or ‘Fail’. Merrychef conneX ® service and repair manual...
  • Page 59 Readings must be below 5mW/cm², ideally zero as there should be no microwave leakage and corrections should be made if any leakage is detected above 0.5mW/cm CAUTION: If a level greater than 5mW/cm² is observed, don't use the appliance until repaired. Merrychef conneX ® service and repair manual...
  • Page 60 On completion of the test, specify the result by selecting ‘Pass’ or ‘Fail’. Note: Opening the door during the test will stop the test. Reselect the test to run again This test only generally recommended for workshop activities. Merrychef conneX ® service and repair manual...

  • Page 61: Recommissioning Test

    If the ‘recommission test’ tab is greyed out, the oven is above 200°C and will not allow to the test to commence until the oven is cooled down. Merrychef conneX ® service and repair manual...
  • Page 62 When all the tests have been successfully performed the display shows the recommission test has passed. Select the green check mark to confirm. In the event of a recommission test failure, the detail will be recorded in the Error Log. Rectify any error and repeat the recommission test. Merrychef conneX ® service and repair manual...
  • Page 63 Model Preheat Display Thermometer Action ® 251°C or higher Recalibrate conneX 12 & 16 250°C *255°C 244°C or lower Recalibrate 245°C to 250°C No action required Merrychef conneX ® service and repair manual...
  • Page 64 10. If the temperature is still unstable repeat steps to make safe and replace the IO board (see Section 6.10 Replacing the IO board). 11. Refit the panels of the casing. 12. Switch ON the appliance and repeat the test procedure as described above. Merrychef conneX ® service and repair manual...

  • Page 65: High Voltage Components (Casing Removed)

    Primary winding and chassis. Pass if reading is over 10 MΩ Filament winding and chassis. Pass if reading is over 10 MΩ NOTE: One end of the high voltage (secondary) winding is connected to the chassis, so this is not tested. Merrychef conneX ® service and repair manual...
  • Page 66 5. Using a megger/insulation tester, test the insulation resistance between both terminals and the metal outer case of the high voltage capacitor. The test is passed if the megger/insulation tester display reads over 100 MΩ. Merrychef conneX ® service and repair manual...

  • Page 67: Mains Voltage Components (Casing Removed)

    Door closed (cooking), speed as specified by program or setting up to a maximum of 7000 rpm (100% @ 10V).  Convection fan: motor speed controller LED status display The VFD contains a diagnostic indicator (Red LED) to display the drives operational status; Merrychef conneX ® service and repair manual...
  • Page 68 Blue or red or yellow to earth (open circuit). With the oven panels refitted and the oven re-connected to the power supply check the fan speeds using visual view in the service mode. Merrychef conneX ® service and repair manual...

  • Page 69: Kitchenconnect Components

    M7 hex socket wrench / nut runner M3 hex key socket M7 hex open / ring spanner M8 hex socket wrench / nut runner M10 hex socket wrench / nut runner M14 hex socket wrench / spanner Merrychef conneX ® service and repair manual...

  • Page 70: Overview

    6 Replacing components Back to contents > Overview View: left hand side View: right hand side Merrychef conneX ® service and repair manual...
  • Page 71 6 Replacing components Back to contents > View: rear side Merrychef conneX ® service and repair manual...
  • Page 72 This is an electrical connection point to ensure that the frame of oven and any external conductive components are at an equal (or practically equal) potential when connected. USB Port USB socket for uploading and downloading firmware & files Merrychef conneX ® service and repair manual...

  • Page 73: Removing / Fitting The Casing

    Important: If the optional ethernet out from the front fixing to remove it. cable is fitted, disconnect before removing the back panel. 4. Ensure the high voltage capacitors are discharged before commencing any work. Merrychef conneX ® service and repair manual...

  • Page 74: Removing / Fitting The Door Assembly And Hinges

    The appliance is cool.  Additional PPE, Mask & Gloves for handling insulation material.  Remove the top and side panels.  Ensure the high voltage capacitors are discharged before commencing any work.  Merrychef conneX ® service and repair manual...
  • Page 75 Check that the door seal firmly meets the cavity frame all the way around once closed. A poor sealing door can  cause issues with the oven’s operation. Check the door switches are correctly adjusted and operating freely.  Merrychef conneX ® service and repair manual...

  • Page 76: Adjusting The Door Microswitches/Interlocks

    Adjust the microswitches after refitting the door or replacement of the door seal.  Adjust the microswitches after refitting or replacing old with new door switches.  Adjust the microswitches after determining incorrect operation during route service and maintenance.  Merrychef conneX ® service and repair manual...
  • Page 77 As soon as the primary door switch (SW3) closes, nip up the two flange head screws to 2.1Nm. Tighten the interlock adjuster locking nut against the bracket using a 7mm spanner to 1Nm. Merrychef conneX ® service and repair manual...
  • Page 78 SW3 closes third  Oven door closed Opening the door: SW3 opens first  SW2 opens second  SW1 closes third  Right-Hand Side Left-Hand side Outer Switch Inner Switch (closest to cooling fan) Merrychef conneX ® service and repair manual...

  • Page 79: Replacing The Door Gasket

    The oven will be ready for usage again after 2 hours Note: This is a generic procedure for the complete range of Merrychef combination ovens. WARNING Never use the oven without the door seal attached properly. Merrychef conneX ® service and repair manual...

  • Page 80: Replacing A Magnetron

    (left) pressed studs. during this process. Secure them by laying them upon a piece of tube while pushing out the studs. CAUTION Wear personal protective equipment to protect your fingers when using the hammer. Merrychef conneX service and repair manual ®...
  • Page 81 Ensure nothing becomes trapped under the magnetron mounting points (e. g. insulation material) while fitting the magnetron. This can lead to microwave leakage. NOTICE: If the electric connections have not been restored properly this may lead to malfunction/damage of the oven. Merrychef conneX ® service and repair manual...

  • Page 82: Replacing The Cooling Fan

    Follow the steps in the reverse order to fit the cooling fan, torquing the cooling fan bracket nuts to 2.1Nm. NOTICE: If the electric connections have not been restored properly this may lead to malfunction/damage of the oven. Merrychef conneX ® service and repair manual...

  • Page 83: Replacing The Ui (User Interface) Assembly

    Looking from the front, top right above the IO Board. Lift the front panel upwards and out to detach from the cavity frame. Disconnect the electrical connections; X523 on the IO board, the USB, ethernet and speaker loom connectors. Merrychef conneX ® service and repair manual...
  • Page 84 (0) position. Accessed by prizing off the protective cap on the back of the UI assembly before fitting to the oven. 1 / 2 / 3 / 4 1 / 2 / 3 Micro SD Card Off/Off/Off/Off - Off/Off/Off replacement Refit all oven panels, plug in the oven and switch on. Merrychef conneX ® service and repair manual...
  • Page 85 Connectivity (WIFI / Ethernet / KitchenConnect) Check the IO and UI versions are the latest release. If not, execute a firmware update using the latest versions. See section 4.5 for details. Recommission the under in the Service Settings Merrychef conneX ® service and repair manual...

  • Page 86: Replacing The Io Board (Input Output Board)

    Loosen the two M7 hex nuts under the IO board on either side to remove the assembly from the frame of the cavity. Remove the PM (Personality Module) from the IO Board and place safety aside to refit to the replacement IO. NOTICE: Do not use tools to remove or refit the Personality Module. Merrychef conneX® service and repair manual...

  • Page 87: Pm (Personality Module) Replacement

    Follow the screen prompts to update the IO firmware if requested. Check the IO and UI versions are the latest release. If not, execute a firmware update using the latest versions. See section 4.5 for details. Recommission the oven in service settings. Merrychef conneX ® service and repair manual...

  • Page 88: Replacing The Stirrer Motor And Stirrer Assembly

    Unfasten the two M7 Hex screws at the front of the jet/impinger plate. Drop down the jet/impinger plate slightly at the front and slide forward to release to two rear tabs. The plate will then drop down and forward to remove. Merrychef conneX ® service and repair manual...
  • Page 89 Tighten the partition plate screws to 2.1 Nm of torque. Tighten the jet/impinger plate screws to NO more than 1.8 Nm of torque. Tighten the stirrer motor pozidrive screws to 1Nm torque. Merrychef conneX ® service and repair manual...

  • Page 90: Replacing The Convection Fan Motor

    Removing the convection fan motor assembly will also give access to the upper & lower catalytic converters and the heating element. CAUTION: Wear personal protective equipment to protect your fingers when using the knife. Merrychef conneX ® service and repair manual...

  • Page 91: Replacing A Transformer (High Voltage)

    & components. microwave circuit & components. Tools required CAUTION: The transformers are heavy. M8 hex socket wrench Wear safety shoes to protect your feet from a dropped transformer. End cutters Discharge Tool Merrychef conneX ® service and repair manual...
  • Page 92 LH HV Transformer Number 50Hz 60Hz 50Hz 60Hz 50Hz 60Hz 50Hz 60HZ  200V 208V 200V 208V  230V 240V 230V 240V   200V 208V 200V 208V  230V 240V 230V 240V  Merrychef conneX ® service and repair manual...

  • Page 93: Removing The Convection Fan Motor Speed Controller

    2.1Nm. Ensure the wiring of the speed controller is in accordance with the diagram shown. Note: Ensure the replacement board has a jumper (link) fitted to the J5 position. Merrychef conneX ® service and repair manual...

  • Page 94: Replacing The Heating Element

    Use a 7mm spanner to hold the terminal on the element and loosen the M7 hex nut fixing the wiring connection. Follow the same procedure re-connecting the wiring and tighten to 2 Nm. Merrychef conneX ® service and repair manual...

  • Page 95: Overview - Further Components

    Loosen the bottom two M7 hex nuts and unfasten the top two M7 hex nuts to remove/refit. Protective earth – connections to casing M8 nut Equipotential bonding connection M8 nut (not fitted to some country specific versions) Merrychef conneX ® service and repair manual...
  • Page 96 M4 flange nut and gasket torqued to 2.1Nm. The steam vent is further supported by connection to the rear panel. Merrychef conneX ® service and repair manual...
  • Page 97 The cavity overheat thermostat switch is located at the rear of the oven, mounted on the left-hand side of the magnetron air flow ductwork, fitted by two M3 x 4 CSK Philips SS Screws and flat washers torqued to 1Nm. The manual reset button is now directly accessible from the rear of the oven. Merrychef conneX ® service and repair manual...
  • Page 98 X12 – Centre / RH Magnetron is connected to the rear HV transformer. The LH Magnetron is connected to the front HV transformer. X16 – RH Magnetron is connected the RH HV transformer. The LH Magnetron is connected to the LH HV transformer. Merrychef conneX ® service and repair manual...
  • Page 99 2.1 Nm. Air Filter Microswitch The air filter microswitch is located on the bottom front left-hand side of the cavity frame by a M5.5 hex nut and wired directly to the IO Board (X511). Merrychef conneX ® service and repair manual...
  • Page 100 UI, by two M7 hex nuts and connected directly to the UI loom. Air Filter Securing Magnet The air filter is secured in position by two magnets on the cavity assembly. Merrychef conneX ® service and repair manual...
  • Page 101 The fuse assembly (F1, F2, F3, F4, F5 & F6) is located to the front of the mains filters on the right-hand side of the oven. F7 is located next to the SMPS Note: Specific fuse rating and function can be found detailed in the circuit diagrams (Section 7.2) Merrychef conneX ® service and repair manual...

  • Page 102: Technical Data Summary Sheet

    E118 LH Mag Stat open circuit Fuse Holder VFD to Bracket Cook Plate Studs Heating Element * see section 3.1 ‘Technical data, checks and verification’ for non-EU model specific readings where they differ. Merrychef conneX ® service and repair manual...

  • Page 103: Circuit Boards And Diagrams

    LD3 – RH Magnetron, yellow = on LD5 - MW voltage selection LD28 – Cooling Fan, on / pulsing relay, yellow = 200/208 VAC HV yellow (varying with wattage) transformer tapping LD4 – LH magnetron, yellow = on Merrychef conneX ® service and repair manual...
  • Page 104 X500 X515 X402 X516 X532 X530 X413 X531 X534 X403 X535 X533 X517 X600 X540 X403 X541 X412 X518 X401 X200 X210 X101 X100 X410 X113 X112 X110 X411 X560 X519 X520 X521 Merrychef conneX ® service and repair manual...
  • Page 105 Wire 19 - X510 Not used – Linked out (jumper) X511 Air Filter micro switch X512 Cavity overheat thermostat. Wires 70 & 69 X513 Centre / RH Magnetron overheat thermostat. Wires 72 & 71 Merrychef conneX ® service and repair manual...
  • Page 106 Not used X534 Not used X535 Not used X540 Not used X541 Not used X560 Not used X600 Chassis ground Note: IO Board test points (TP1 to TP58) are for factory build procedures only. Merrychef conneX ® service and repair manual...

  • Page 107: Circuit Diagrams

    7 Circuit boards and diagrams Back to contents > Circuit diagrams conneX wiring diagram 50Hz 200/230V Door switches – LV safety interlock circuit Overheat thermostats – ELV safety circuit 1000W Ovens 2000W Ovens Merrychef conneX ® service and repair manual...
  • Page 108 7 CIRCUIT B OARD S A ND DIAGRA MS IO BOARD Notes: Standard power versions (Centre Magnetron only) IO Board LV Connections X514. Link fitted X112. Pins 1 & 2 not used X411. Not used Merrychef conneX ® service and repair manual...
  • Page 109 7 Circuit boards and diagrams Back to contents > 7 CIRCUIT B OARD S A ND DIAGRA MS Merrychef conneX ® service and repair manual...
  • Page 110 7 Circuit boards and diagrams Back to contents > 7 CIRCUIT B OARD S A ND DIAGRA MS Door switches – LV safety interlock circuit Overheat thermostats – ELV safety circuit 1000W Ovens 2000W Ovens Merrychef conneX ® service and repair manual...
  • Page 111 7 CIRCUIT B OARD S A ND DIAGRA MS IO BOARD IO Board LV Connections Notes: Standard power versions (Centre Magnetron only) X514. Link fitted X112. Pins 1 & 2 not used X411. Not used Merrychef conneX ® service and repair manual...
  • Page 112 7 Circuit boards and diagrams Back to contents > 7 CIRCUIT B OARD S A ND DIAGRA MS Merrychef conneX ® service and repair manual...

  • Page 113: Annual Pm Check Procedure For Connex

    Please adhere to all Merrychef safety aspects Time to complete: 1-3 hours at all times. Model(s): Merrychef conneX 12 & 16 Service procedures All tests to be carried out by a trained Merrychef technician. • Ensure all documented safety procedures are followed for each individual task.
  • Page 114 Follow the onscreen instructions and record result. 18. Come out of the service and setting modes. Pre-heat the oven and cook one item of food from the operators’ menu. Merrychef conneX™ service and repair manual...
  • Page 115 Planned preventative maintenance schedule for the Daily Comments Merrychef conneX commercial combination oven months months months ® ..Item Description Commissioning Operat OCIE See latest parts manual for part check numbers ..
  • Page 116 Microwave Combination Oven ® Merrychef conneX Part Number 32Z9170 Version 1 conneX Service/RepairMan_May 2022 © 2022 Welbilt UK Ltd except where explicitly stated otherwise. All rights reserved. Merrychef conneX ® service and repair manual...

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