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Despatch LBB 2-18 - User Manual

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LBB Series Oven Owner’s Manual PREFACE
Version 20
LBB SERIES OVEN
OWNER’S MANUAL
C-188
PN 336979
VERSION 20
4/2018

Table of Contents

Questions and Answers

  • L
    Lisa RushAug 18, 2025
    Why is my Despatch Oven not heating up properly?
    • B
      Benjamin PrestonAug 19, 2025
      If your Despatch Oven fails to heat or only reaches 30–50 °C, there are several potential causes. First, check the power source, oven, and wall fuses. A burned-out heater element could also be the reason, in which case it should be replaced. A Control Instrument malfunction could be the problem; check the control parameters and replace the controller if the OUT LED does not turn on. Lastly, inspect for loose wire connections behind the control panel after disconnecting the power.
  • K
    kimberly66Aug 21, 2025
    Why does my Despatch Oven heat up so slowly?
    • K
      Karen SmithAug 21, 2025
      Several factors can cause a Despatch Oven to heat up slowly. An improperly loaded workload, low line voltage, one or two burned-out heating elements, a wide-open vent, or fan motor failure. To address this, reduce the load or redistribute it within the chamber. Ensure sufficient power and proper connections, checking for circuit overload. Verify heater amperage and replace any burned-out elements. Close the vent. Finally, consider replacing the fan motor.
  • E
    Elizabeth PowellAug 23, 2025
    What causes frequent heater element burnout in my Despatch Oven?
    • K
      Kristi BellAug 23, 2025
      Frequent heater element burnout in a Despatch Oven can stem from several causes. Harmful fumes generated by the load, spillage on heater elements, overheating, or fan motor failure. Increase the vent opening or discontinue the process if fumes are the issue. Disconnect power and clean the oven chamber and elements if there's spillage. Check the Control and High Limit instruments if the oven is overheating. Replacing the fan motor might be necessary.
  • D
    Dr. Richard ChenAug 26, 2025
    What to do if Despatch Oven will not control at Setpoint?
    • D
      Douglas JimenezAug 26, 2025
      If your Despatch Oven isn't controlling at the setpoint, it could be due to a High Limit instrument set too low, a Control instrument malfunction, or air friction from the recirculation fan. Try setting the High Limit higher. Check control parameters before replacing the Control instrument. Also, open the exhaust air vent, as the unit won't control at the minimum operating temperature with the vent closed.
  • T
    Tiffany StewartAug 28, 2025
    How to fix inaccurate temperature in Despatch Oven?
    • G
      Gary WrightAug 28, 2025
      An inaccurate temperature in your Despatch Oven is likely due to control instrument miscalibration. Check the control parameters and recalibrate the Control instrument.
  • D
    Daniel MatthewsAug 30, 2025
    Why is the temperature in my Despatch Oven so erratic?
    • W
      William SmithAug 30, 2025
      Erratic temperature in your Despatch Oven is caused by control instrument malfunction. Check control parameters before replacing the Control instrument.
  • E
    Elizabeth WalkerSep 1, 2025
    What to do if heater in Despatch Oven doesn't shut down until temp. reaches the High Limit setting?
    • J
      Jacob BrownSep 1, 2025
      If the heater in your Despatch Oven doesn't shut down until the temperature reaches the High Limit setting, it could be due to a Control instrument malfunction or an SSR Relay malfunction. Verify the control parameters and replace the control instrument if no output exists. If control output exists, replace the relay.
  • N
    Nancy BakerSep 4, 2025
    Why is the surface or door temperature of my Despatch Oven excessively high?
    • W
      warrenkristySep 4, 2025
      Excessive surface or door temperature in a Despatch Oven can be caused by door seal deterioration or the door being closed into only the top or bottom latch. Replace the door seal. Ensure that the latch strike is contacting center of latch. Adjust mounting angle as required. Adjust door for even top and bottom latch tension by turning screws on ends of latch. Clockwise increases tension on latch. Counterclockwise decreases tension.
  • M
    mrodriguezSep 6, 2025
    How to fix improper airflow in Despatch Oven?
    • H
      Hannah MendozaSep 6, 2025
      Improper airflow in a Despatch Oven can result from fan motor failure or an unbalanced fan wheel. Replace the fan motor. Reposition the fan wheel within 3/10” from the top of the housing or replace the fan wheel.
  • D
    Dalton AndersonSep 8, 2025
    What causes excessive vibration in my Despatch Oven?
    • R
      Rebecca HopkinsSep 8, 2025
      Excessive vibration in a Despatch Oven can be attributed to a dirty or unbalanced fan wheel. Clean the fan. Replace the fan wheel.

Summary

1. About This Manual

1.1. Important User Information

Essential information for safe and effective oven operation.

1.4. Conventions

Safety Icons and Typeface Conventions

1.5.3. Power

Power Requirements and Ratings

1.5.4. Temperature

Temperature Performance Data

Time to temp, recovery, uniformity, and control stability.

2. Safety

2.1. Safety Information

General safety guidelines and warnings for oven operation.

2.1.1. Lockout Procedures

Steps for safely de-energizing equipment before maintenance.

3. Theory of Operation

3.2. Control Systems

4. Assembly & Setup

4.1. Unpack & Inspect the LBB Series Oven

4.2. Set-up the LBB Series Oven

4.2.3. Wiring & Power Connections

Wiring and Power Connection Guidance

Guidance on connecting the oven to the electrical supply.

5. Operation

5.2. Pre-Startup Checklist

5.3. Operating Procedure-Standard Control Instrument

5.3.1. Start Oven

Detailed steps for powering on and starting the oven.

5.4. Working with the Control Instrument

5.4.1. Change Setpoint

Procedure for adjusting the oven's temperature setpoint.

5.4.5. Set the High Limit

5.4.5.1. Change the High Limit Instrument Setpoint

Procedure to set the high limit temperature setpoint.

6.4. Routine Tests

6.5.1. Replace the Control Instrument

Control Instrument Replacement Procedure

6.5.2. Replace High Limit Instrument

High Limit Instrument Replacement Procedure

6.5.4. Replace Heater Unit

Heater Unit Replacement Procedure

6.5.5. Replace Fan Motor

Fan Motor Replacement Procedure

7. Troubleshooting

Common Technical Issues and Remedies

Table of common problems, causes, and suggested solutions.

7.1. DES2000 Control Parameters Check

Control Parameters Verification

Steps to check and verify DES2000 control instrument parameters.

7.2. Hi Limit L91 Hi-Limit Reset

Hi-Limit Instrument Reset Procedure

Procedure for resetting the high limit instrument.

Despatch LBB 2-18 Specifications

General IconGeneral
Heating Zones1
Control SystemDigital control
Interior Dimensions18 x 18 x 18 inches
ConstructionStainless steel interior
InsulationMineral wool insulation
Temperature Range15 °C above ambient to 260 °C (500 °F)

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