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Despatch LBB 2-27 - 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

  • W
    william77Aug 18, 2025
    Why is my Despatch Oven not heating up properly?
    • D
      donna51Aug 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
    Kristy ToddAug 21, 2025
    Why does my Despatch Oven heat up so slowly?
    • C
      Caleb LeeAug 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.
  • T
    Timothy MitchellAug 23, 2025
    What causes frequent heater element burnout in my Despatch Oven?
    • P
      Paige JohnsAug 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.
  • J
    Joseph Johnson IIAug 26, 2025
    What to do if Despatch Oven will not control at Setpoint?
    • M
      matthew37Aug 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.
  • R
    Roberta NavarroAug 28, 2025
    How to fix inaccurate temperature in Despatch Oven?
    • E
      elizabethhamptonAug 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.
  • K
    Kimberly LarsonAug 30, 2025
    Why is the temperature in my Despatch Oven so erratic?
    • J
      Justin FreemanAug 30, 2025
      Erratic temperature in your Despatch Oven is caused by control instrument malfunction. Check control parameters before replacing the Control instrument.
  • J
    Jeffrey FullerSep 1, 2025
    What to do if heater in Despatch Oven doesn't shut down until temp. reaches the High Limit setting?
    • Y
      yolandakaufmanSep 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.
  • D
    David MillerSep 4, 2025
    Why is the surface or door temperature of my Despatch Oven excessively high?
    • A
      Ashley MeyerSep 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.
  • S
    Sherri CameronSep 6, 2025
    How to fix improper airflow in Despatch Oven?
    • B
      Brian ButlerSep 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.
  • M
    Ms. Sarah BradfordSep 8, 2025
    What causes excessive vibration in my Despatch Oven?
    • G
      gordonautumnSep 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

Specifications

1.5.3. Power

1.5.4. Temperature

Specifies temperature performance, uniformity, and control stability.

Safety

2.1. Safety Information

Crucial warnings and guidelines for safe operation and maintenance.

2.1.1. Lockout Procedures and Requirements

Procedures and requirements for safely de-energizing equipment.

2.3. Maintenance

2.4. Electrical Power Safety

Emphasizes safety when working with electrical power sources.

2.5. Fire Safety Procedures

Procedures to follow in case of a fire incident.

2.6. Equipment Lockout Requirements

Reinforces lockout procedures to prevent injury during service.

2.6.1. Emergency Stop

2.7. Disconnecting Devices

2.7.1. Power Requirements

2.7.2. Disconnecting Hard-Wired Units

2.7.3. Disconnecting Corded Units

2.7.4. Disconnecting Units with (Optional) Disconnect Switch

Theory of Operation

3.2. Control Systems

Overview of the oven's primary and secondary control systems.

3.2.1. Primary Control Instrument

Describes the microprocessor-based digital temperature controller.

3.2.2. High Limit Instrument Function

Explains the function and setting of the High Limit instrument.

3.2.2.1. Product High Limit Instrument Setup

Setting the High Limit for product protection against over-temperature.

3.2.2.2. Oven High Limit Instrument Setup

Setting the High Limit for oven protection against over-temperature.

Assembly & Setup

4.1. Unpack & Inspect the LBB Series Oven

4.2. Oven Setup and Environment

Steps for setting up the oven and selecting its operating environment.

4.2.2. Set-up Procedure

4.2.3. Wiring & Power Connections

Instructions for connecting the oven to the electrical supply.

Operation

5.1. Loading the Oven

5.2. Pre-Startup Checklist

5.3. Operating Procedure - Standard Control Instrument

Step-by-step guide for operating the oven using the standard controller.

5.3.1. Starting the Oven

Detailed procedure for powering on and starting the oven.

5.4. Working with the Control Instrument

5.4.1. Changing the Setpoint

Procedure for adjusting the oven's setpoint temperature.

5.4.2. Control Instrument Parameter Programming Mode

5.4.2.1. Entering Control Instrument Set-up and Configuration Mode

5.4.5. High Limit Instrument Settings

Procedures for setting and configuring the High Limit instrument.

Maintenance

6.1. Maintenance Checklist

6.3. Cleaning and Decontamination Procedures

6.3.2. Decontaminating the LBB Series Oven

6.4. Routine Tests

6.4.1. Test Control Instrument

6.4.2. Test High Limit Instrument

6.5.1. Replace the Control Instrument

Step-by-step guide for replacing the oven's control instrument.

6.5.2. Replace High Limit Instrument

Detailed instructions for replacing the High Limit instrument.

6.5.4. Replace Heater Unit

Step-by-step guide for replacing the oven's heater unit.

6.5.5. Replace Fan Motor

Detailed instructions for replacing the oven's fan motor.

Troubleshooting

7.1. DES2000 Control Parameters Check

7.2. Hi Limit L91 Hi-Limit Reset

Despatch LBB 2-27 Specifications

General IconGeneral
BrandDespatch
ModelLBB 2-27
CategoryOven
LanguageEnglish

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