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Middleby Marshall LongWave LW26 Series Owner's Operating And Installation Manual

Single/double/triple/quad oven two/three/four-stack
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OWNER'S
OPERATING
& INSTALLATION
MANUAL
LONGWAVE Electric Ovens
LW26/LW33-Series
CAUTION
Read the instructions before using the machine.
© 2024 Middleby Marshall Inc.
is a registered trademark of Middleby Marshall, Inc. All rights reserved.
1
LW26/LW33-Series Electric Ovens: English
Combinations:
• Single Oven
• Double Oven (Two-Stack)
• Triple Oven (Three-Stack)
• Quad Oven (Four-Stack,
LW33 Only)
P/N 79467 rev C

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Summary of Contents for Middleby Marshall LongWave LW26 Series

  • Page 1 • Double Oven (Two-Stack) LW26/LW33-Series • Triple Oven (Three-Stack) • Quad Oven (Four-Stack, LW33 Only) CAUTION Read the instructions before using the machine. © 2024 Middleby Marshall Inc. is a registered trademark of Middleby Marshall, Inc. All rights reserved. P/N 79467 rev C...
  • Page 2 This manual must be kept in a prominent, easily reachable installing or servicing the equipment. location near the oven. Middleby Marshall suggests a service contract with a WARNING Middleby Authorized Service Agent (ASA). Flooring adjacent to the equipment may become DEFINITIONS slippery.
  • Page 3 Seller shall not be liable or lost profits of Buyer. for any prospective or lost profits of the buyer. This warranty is effective on Middleby Marshall equipment sold The foregoing shall be Seller’s sole and exclusive obligation and on, or after January 1st, 2007.

  • Page 4: Table Of Contents

    Table of Contents SECTION 1 DESCRIPTION ..........5 IV. LONGWAVE QUICK START/OPERATING INSTRUCTIONS ............ 26 MODEL IDENTIFICATION ........5 A. QUICK START INSTRUCTIONS ....26 II. LW26/LW33 SERIES SPECIFICATIONS ....6 B. STANDBY/SPLASH SCREEN ..... 26 III. COMPONENT FUNCTION ........7 C.

  • Page 5: Section 1 Description

    SECTION 1 DESCRIPTION SECTION 1 DESCRIPTION I. MODEL IDENTIFICATION LONGWAVE LW26/LW33 conveyor ovens designed to cook, bake, or broil in high volume with consistent quality results. The LONGWAVE oven may be used either as a single oven or stacked for use as double or triple ovens.

  • Page 6: Lw26/Lw33 Series Specifications

    SECTION 1 DESCRIPTION II. LW26/LW33 SERIES SPECIFICATIONS RECOMMENDED MINIMUM CLEARANCES FROM COMBUSTIBLE CONSTRUCTION Rear of Oven to Wall - Left Side of Oven to Wall - Right Side of Oven to Wall - 6" (152mm) 24" (610mm) 24" (610mm) LW26/LW33 SERIES ELECTRICAL SPECIFICATIONS Model No.

  • Page 7: Component Function

    SECTION 1 DESCRIPTION Components Locations III. COMPONENT FUNCTION Manual Mode: A. Touch Screen Oven Controller The touch screen controller controls all functions of the oven. The cooking temperatures can be set from 300°F to 1200°F (149°C to 649°C). Cooking times (conveyor speed) can be set from the minimum to the maximum speed, which is dependent on the oven size.

  • Page 8: Infrared Heating Panels

    SECTION 1 DESCRIPTION LONGWAVE Heat Zones B. Infrared Heating Panels Heating panels are positioned above and below the conveyor belt in the oven chamber (Figure 4). When energized, these panels emit infrared long waves. These waves do not heat the air through which they pass.

  • Page 9: Section 2 Installation

    SECTION 2 INSTALLATION SECTION 2 INSTALLATION NOTE: All aspects of the oven installation, including WARNING placement, utility connections, ventilation Keep the appliance area free and clear of requirements, must conform with any applicable local, combustibles. national, international codes. These codes supersede the requirements and guidelines provided WARNING in this manual.

  • Page 10: Unloading, Dimensions, And Rough-In

    I. UNLOADING, DIMENSIONS, AND C. Items for Stacking Oven ROUGH-IN The following items are required for stacking ovens: Your Middleby Marshall LW26/LW33-Series Oven is Quantity Description shipped partially assembled. It will arrive in a carton on 10' (305cm) 4-by-4 boards a crate.
  • Page 11 SECTION 2 INSTALLATION LW26 Single Oven on a Base – 15" Legs LW26 Single Oven on a Base – 4" Legs...
  • Page 12 SECTION 2 INSTALLATION LW26 Double-Stacked Oven on a Base – 15" Legs LW26 Double-Stacked Oven on a Base – 4" Legs...
  • Page 13 SECTION 2 INSTALLATION LW26 Triple-Stacked Oven on a Base – No Legs...
  • Page 14 SECTION 2 INSTALLATION LW33 Single Oven on a Base – 15" Legs...
  • Page 15 SECTION 2 INSTALLATION LW33 Double-Stacked Oven on a Base – 15" Legs LW33 Triple-Stacked Oven on a Base – 9" Legs...
  • Page 16 SECTION 2 INSTALLATION LW33 Triple-Stacked Oven on a Base – 6" Legs LW33 Quad-Stacked Oven – No Legs...
  • Page 17 SECTION 2 INSTALLATION LW26 Single Oven Stand Parts Item Qty. Part Number Description 79794 KIT, TOP & BASE LW26 79254 LEG, APPL 4" ADJ NP BODY 21256-0008 SCR, MS SLT TRHD 10-32X3/8 LW26 Double Oven Stand Parts Item Qty. Part Number Description 79794 KIT, TOP &...
  • Page 18 SECTION 2 INSTALLATION LW33 Single/Double Oven Stand Parts Item Qty. Part Number Description 79475 KIT, BASE & TOP NO LEGS LW33 66948 LEG, 15" COMMON TUBE & CASTER 21416-0001 WASHER, FLAT 3/8 SS 2000531 SCR, CAP HX HD 3/8-16X1 NP 21422-0001 WASHER, SPLIT LOCK 3/8 ZP 21256-0008...

  • Page 19: Base Section Assembly

    SECTION 2 INSTALLATION Oven Stand Parts D. Base Section Assembly 3. Slide the two 10' (305cm) long 4-by-4 boards through the oven cavity. The boards should be 1. Locate the carton containing the oven base. sticking out of the oven equally on both sides. One Remove and inventory the contents.

  • Page 20: Stacking And Mounting Two Ovens

    SECTION 2 INSTALLATION 6. When the oven is completely free from the skid, centered with the 10' (305cm) boards running slide the skid out from under the oven. through the oven cavity. See Figure 18. NOTICE NOTICE Dispose of the skid in accordance with local Lift the oven with the 10' (305cm) 4-by-4 boards running through the oven only.
  • Page 21 SECTION 2 INSTALLATION shelves are packed in a separate carton inside oven. outward until they are horizontal and then push in The bottom oven should have solid crumb trays, all toward oven chamber. other ovens should have perforated crumb trays. NOTICE NOTICE Make sure protective plastic film is removed from...

  • Page 22: Ventilation Guidelines

    SECTION 2 INSTALLATION UTILITY ROUGH-IN DIMENSIONS AND POSITIONING FOR LW26/LW33-SERIES OVEN WARNING Do not use conduit for ground connection. CAUTION It is recommended that the oven be placed under a ventilation hood for adequate air supply and ventilation. IMPORTANT Electric supply to be provided by customer. CIRCUIT BREAKER Separate circuit breaker with lockout/tagout electrical shutoff for each oven.

  • Page 23: Electrical Connection Information For Lw26/Lw33-Series Ovens

    SECTION 2 INSTALLATION III. ELECTRICAL CONNECTION INFORMATION FOR LW26/LW33-SERIES OVENS WARNING Authorized supplier personnel normally accomplish the connections for the ventilation system and electric supply, as arranged by the customer. Following these connections, the factory-authorized installer can perform the initial startup of the oven. Check the oven data plate (Figure 20) before making any electric supply connections.

  • Page 24: Section 3 Operation

    SECTION 2 INSTALLATION SECTION 3 OPERATION I. CONTROL FUNCTIONS LW26/LW33-Series Oven Control Functions B. Circuit Breakers WARNING Possibility of injury from rotating parts and 3 amp circuit breakers provide overload protection for electric shock. the control circuit. Never disassemble or clean the oven with the C.

  • Page 25: Step-By-Step Operation

    SECTION 3 OPERATION Control Panel III. STEP-BY-STEP OPERATION During Preheat mode, the screen will display either the Preheat Progress screen or the A. Daily Startup Procedure Manual/Preset screens. The conveyors will be highlighted in red and display “Not Ready,” 1. Check that the circuit breaker/fused disconnect is operating at minimum speed until the oven in the on (closed) position.

  • Page 26: Longwave Quick Start/Operating Instructions

    1. Turn on the circuit breaker and confirm that the screen powers up. This can take several seconds. 2. When the Middleby Marshall logo and Power Button are shown (see STANDBY SCREEN below), press the power button to begin preheat.

  • Page 27: Preheat Screen

    SECTION 3 OPERATION C. PREHEAT SCREEN Displays preheat status, allows access to oven settings by selecting PRESETS or MANUAL tab, and shows preheat progress. During preheat, the conveyors will creep at low speeds. PRESETS: Press to switch to preset screen. MANUAL: Press to switch to manual screen.

  • Page 28: Manual Cooking

    SECTION 3 OPERATION D. MANUAL COOKING Allows manually setting oven temperatures and belt times. Temperature changes are in 5-degree Fahrenheit increments (1 degree when switched to Celsius), for more precise temperatures presets must be used. The zone position on the screen matches the zone position in the oven. The zones can be set individually, but setting the zones too far apart may cause issues.

  • Page 29: Preset Screen

    SECTION 3 OPERATION E. PRESET SCREEN Allows the creation, editing, and selection of presets. F. COOLDOWN Hold the power button (~0.3 seconds) to initiate cooldown. A confirmation screen will show. Press “No” to return to normal operation. oven operation will not be affected by the dialogue unless “Yes”...

  • Page 30: Cooldown Screen

    SECTION 3 OPERATION G. COOLDOWN SCREEN The cooldown screen will show cooldown progress. Cooldown can be initiated by the user or by a critical error. The conveyors will creep at low speed during cooldown. Once the oven reaches 200°F, the screen will return to the main splash screen, the cooling fan will turn off, and the conveyors will stop.

  • Page 31: Preset Screen Selection Process

    SECTION 3 OPERATION During self-clean, the oven will obtain a high temperature, the conveyors will crawl at a slow speed, and a timer will begin. After the timer has expired, the oven will return to the previous oven state. If the heat was on (the oven was in the Preheat or Bake states), the oven will return to the preheat state.
  • Page 32 SECTION 3 OPERATION Selecting the second belt for preset selection will show compatible cavity settings grouped together with a green border. Presets that are not compatible will be shown with a yellow border.
  • Page 33 SECTION 3 OPERATION When a preset is selected that is incompatible with the existing cavity settings, a warning will appear. Pressing “Cancel” will return the user to the selection process. Pressing “Continue with Change” will change the cavity settings and de-select the incompatible preset. You can also select the same preset if the same belt speed is required for both belts.

  • Page 34: Preset Creation/Edit Process

    SECTION 3 OPERATION J. PRESET CREATION/EDIT PROCESS Press the pencil icon in the top right of the screen to begin editing presets. You will be taken to the preset edit screen. You can select existing presets to edit them or create new presets. Press the “+ Preset” button to add a new preset.
  • Page 35 SECTION 3 OPERATION In the “Create New Preset” screen, tap on an entry to edit it, starting with the “Name” field. Enter a name for the preset, then press “Enter” (right-facing arrow). Pressing the up or down arrow will move to next field without...
  • Page 36 SECTION 3 OPERATION If you add a graphic to the preset, you can select from built-in images or icons, or images from a USB stick. Icons can have different colors for the backgrounds. After selecting a graphic for the preset, menu items can be added.
  • Page 37 SECTION 3 OPERATION Entering menu items allows you to select a name and picture for each menu item. These menu items are for reference only.

  • Page 38: Settings Page

    SECTION 3 OPERATION K. SETTINGS PAGE Press the “Gear” icon to enter the Settings login screen. This allows access to settings once logged in. Pressing “No Passcode” allows access oven details only, such customer name, serial number, software versions. Enter the passcode and press “Enter”...

  • Page 39: Manager Settings

    SECTION 3 OPERATION V. MANAGER SETTINGS A. General Settings Audio Feedback Enabled: Enables audio feedback for alerts. Beep on Button Press: Enables an audible beep when a button is pressed. Language Icon View: Enables or disables the language icon which can be used to change the control language at any time.

  • Page 40: Belt Settings

    SECTION 3 OPERATION Edit Presets: Allows manager to edit presets. Manual Button View: Enables manual oven control. Preset Edit Allowed: Enables preset editing on the preset screen. If disabled, presets may only be edited by the manager on this screen. Start Clean Mode: Start the oven self clean cycle.

  • Page 41: Iot/Open Kitchen Instructions

    SECTION 3 OPERATION C. IoT/Open Kitchen Instructions To connect the oven to Open Kitchen requires three items: 1. A Connectware WiFi Module, installed in the oven control compartment. Confirm with your sales representative. An ASA is required to install a WiFi Module. 2.

  • Page 42: Open Kitchen Setup

    SECTION 3 OPERATION E. Open Kitchen Setup Write down the Connectware Module MAC Address and the oven’s Serial Number located on the data plate. Navigate to this website: https://www.cognitoforms.com/PhD11/ConnectedEquipmentSetup Enter details to set up Connectware. Contact Open Kitchen representative for further assistance.

  • Page 43: Cooking In A Longwave Oven

    SECTION 3 OPERATION VI. COOKING IN A LONGWAVE OVEN NOTE: The temperatures in each heating zone may be set independently, without regard to the setpoints A. Cooking Trials of other zones. However, the zones are not entirely independent of one another. If a zone is set to a lower The purpose of conducting cooking trials is to temperature than another, it will absorb heat radiated determine the exact temperature settings and cooking...
  • Page 44 SECTION 3 OPERATION...

  • Page 45: Quick Reference: Faults

    SECTION 3 OPERATION VII. QUICK REFERENCE: FAULTS SYMPTOM POSSIBLE CAUSE REMEDY PROBE # OPEN shown on Temperature Probe is detected in display and audible alarm Call the Service Hotline. an open condition. sounds Belt was overloaded and control FRONT BELT JAMMED, Check belt for cause of jamming.
  • Page 46 SECTION 3 OPERATION Record Time and Temp Table Product Zone Temperatures Cook Time Pan Type and Amount State Min. Size Weight or Entrance Exit Count Top / Bott. Top / Bott.

  • Page 47: Section 4 Cleaning And Maintenance

    NOTICE ANY replacement parts that require access to the interior of the oven may ONLY be replaced by a Middleby Marshall Authorized Service Agent. It is also strongly recommended that the 3-Month Maintenance and 6-Month Maintenance procedures in this section be performed ONLY by a Middleby Marshall Authorized Service Agent.
  • Page 48 SECTION 4 MAINTENANCE 3. Dry and re-install the 6. Wipe with a towel with heat curtain. general purpose cleaner send through dishwasher (optional). Dry and re-install. 4. Remove any crumbs from the belt with a wire brush. NOTE: Belt does not need to be removed for cleaning.
  • Page 49 SECTION 4 MAINTENANCE 9. Remove fan filter, rinse with cold water, and reinstall when dry. 10. Wipe the top, front, and sides with a clean towel with general purpose cleaner.

  • Page 50: Cleaning - Weekly

    The Self Clean cycle can be used on a daily basis. Middleby Marshall recommends running the Self Clean cycle at the beginning of the day to allow the oven to ramp up, clean, then revert to preset settings.

  • Page 51: Maintenance - Every 6 Months

    Middleby Marshall Authorized Service A. Electrical Terminals Agent must be called. Open the control cabinet door by removing the two Obtain a service contract with a Middleby Marshall • screws from the control cabinet door. Tighten all Authorized Service Agent.
  • Page 52 SECTION 4 MAINTENANCE LW26-SERIES ELECTRIC OVEN KEY SPARE PARTS KIT (Figure 26) ITEM PART NO. DESCRIPTION LW26, 208/240V LW26, 380V 79466 Filter, Magnetic Fan 79758 Fan, Cooling 24 VDC 77276 Board, Relay 79966 Display, OneTouch 78210 Contactor 4 pole 79609 Relay, 240V 100A Solid State 45036 Breaker, Circuit 240V 3A...
  • Page 53 SECTION 4 MAINTENANCE LW33-SERIES ELECTRIC OVEN KEY SPARE PARTS KIT (Figure 27) ITEM PART NO. DESCRIPTION LW33, 208/240V LW33, 380V 79466 Filter, Magnetic Fan 79758 Fan, Cooling 24 VDC 77276 Board, Relay 79966 Display, OneTouch 78210 Contactor 4 pole 79609 Relay, 240V 100A Solid State 45036 Breaker, Circuit 240V 3A...
  • Page 54 SECTION 4 MAINTENANCE NOTES...

  • Page 55: Section 5 Troubleshooting

    SECTION 5 TROUBLESHOOTING SECTION 5 TROUBLESHOOTING SYMPTOM PROBLEM SOLUTION Conveyor belt stops completely Check to see if drive roller is turning. 1. Check for objects jammed in or intermittently. conveyor and remove. 2. Turn oven off, reset the circuit breaker, and turn oven on. 3.
  • Page 56 SECTION 5 TROUBLESHOOTING NOTES...

  • Page 57: Section 6 Electrical Schematics

    SECTION 6 ELECTRICAL SCHEMATICS SECTION 6 ELECTRICAL SCHEMATICS Wiring Diagram, LW26/LW33, 208/240 3PH • 79300 REV B...
  • Page 58 SECTION 6 ELECTRICAL SCHEMATICS...
  • Page 59 SECTION 6 ELECTRICAL SCHEMATICS Wiring Diagram, LW26/LW33, 380V 3PH CE • 79306 REV B...
  • Page 60 SECTION 6 ELECTRICAL SCHEMATICS Wiring Diagram, LW26/LW33, 230V 1PH CE • 79304 REV B...
  • Page 61 SECTION 6 ELECTRICAL SCHEMATICS Wiring Diagram, LW26/LW33, 380/416V 3PH • 79302 REV B...
  • Page 62 NOTICE During the warranty period, ALL parts replacement and servicing should be performed by your Middleby Marshall Authorized Service Agent. Service that is performed by parties other than your Middleby Marshall Authorized Service Agent may void your warranty.

This manual is also suitable for:

Longwave lw33 series

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