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Despatch LAC Series - User Manual

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LAC/LFC Series Oven Owner’s Manual PREFACE
Version 1.12 1
Copyright © 2018 by Despatch Industries.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
ULTRAFLEX DRYING AND FIRING
FURNACE
MODELS 1000, 3615, 3630, 3640
OWNERS MANUAL
C-204
VERSION 1
10/2008
LAC/LFC SERIES OVEN WITH
PROTOCOL 3™ CONTROLLER
OWNER’S MANUAL
C-266
PN 337069
VERSION 1.12
05/2018

Table of Contents

Questions and Answers

  • B
    Brandon HarrisonAug 15, 2025
    Why Despatch LAC Oven is not heating up properly?
    • B
      Brent HarveyAug 15, 2025
      There are several reasons why your Despatch oven might not be heating correctly. It could be due to: * No power: Check the power source and fuses. * A broken or frayed cord: Replace the cord. * A burned-out heater: Replace the heater. * A malfunctioning controller: Replace the controller. * Loose wire connections: Disconnect the power and check the connections behind the control panel. * Heater relay failure: Replace the circuit board or SCR. * Airflow switch malfunction: Refer to Section 6.5.1 * Door switch failure: Replace the door switch.
  • S
    Steven JonesAug 18, 2025
    What to do if my Despatch LAC Oven heats up too slowly?
    • W
      Wanda SanchezAug 18, 2025
      If your Despatch oven is heating up slowly, it could be due to several factors: * The oven is improperly loaded. Try reducing the load or redistributing it within the chamber. * There is low line voltage. Ensure sufficient power and proper connections, and check for circuit overload. * Heating elements are burned out. Replace any burned-out elements. * A 240-volt oven is connected to a 208V line. Raise the line voltage to 240 volts or modify the oven for 208V operation (consult factory). * Fan motor failure. Replace the fan motor.
  • J
    Joseph PayneAug 21, 2025
    Why does my Despatch LAC Oven have erratic temperature?
    • M
      Michael BakerAug 21, 2025
      Erratic or inaccurate temperature in your Despatch oven can be caused by: * A malfunctioning controller. Replace the controller. * Improper tuning parameters. Check the tuning parameters. * Controller miscalibration. Recalibrate the controller (See Protocol 3 Owner’s Manual, sections on Calibration). * High Limit setting. The High Limit should be 10-25°C higher than the setpoint. * Improper offset. Check zone calibration.
  • T
    Todd JacobsAug 25, 2025
    What causes frequent heater element burnout in Despatch Oven?
    • C
      Christopher LewisAug 25, 2025
      Frequent heater element burnout in your Despatch oven can be attributed to: * Harmful fumes generated by the load. Increase vent opening or discontinue the process. * Splattering of material on heater elements. Disconnect power and clean the oven chamber and elements. * Overheating oven. Check the High Limit. * Fan motor failure. Replace the fan motor.
  • B
    barbara72Aug 27, 2025
    Why Despatch Oven will not control at setpoint?
    • W
      Walter DunnAug 28, 2025
      If your Despatch oven isn't controlling at the setpoint, consider these potential causes: * High Limit set too low: Set the High Limit higher. * Controller malfunction: Check controller settings or replace the controller. * SSR malfunction: Replace the SSR and/or check control output voltage. * Air friction of recirculation fan: Open fresh air or exhaust air vent. Note that the unit will not control below the minimum operating temperature with the vent closed.
  • R
    Randy SantiagoAug 31, 2025
    Why is the surface or door temperature of my Despatch LAC excessive?
    • X
      xbradleyAug 31, 2025
      Excessive surface or door temperature on your Despatch oven may be due to: * Door seal deterioration: Replace the door seal. * Oven over pressurization: Close the fresh air damper or, on LFC, open the exhaust damper.
  • E
    elizabeth95Sep 3, 2025
    What causes excessive vibration in my Despatch Oven?
    • L
      Lisa ToddSep 4, 2025
      Excessive vibration in your Despatch oven can be caused by: * A dirty fan wheel: Clean the fan. * An unbalanced fan wheel: Replace the fan wheel.
  • K
    Kayla MorganSep 6, 2025
    What causes improper airflow in Despatch LAC Oven?
    • C
      collinskaylaSep 7, 2025
      Improper airflow in your Despatch oven can be caused by: * Fan motor failure: Replace the fan motor. * Fan wheel seated too low on fan shaft: Adjust the fan wheel for 3/16" clearance between the wheel and inlet ring.
  • J
    jenniferreynoldsSep 12, 2025
    What to do if the heater of Despatch LAC Oven does not shut down until it reaches the High Limit setting?
    • J
      johnkirkSep 12, 2025
      If the heater in your Despatch oven continues to run until it reaches the High Limit setting, it could be due to: * Controller malfunction: Replace the controller. * SSR malfunction: Replace the SSR.

Summary

About This Manual

Important User Information

Key user guidelines, disclaimers, and operating protocols for safe and effective oven use.

Manufacturer, Model Nomenclature & Service

Details on oven models, identification nomenclature, and essential service/support contacts.

Organization of this Manual

Overview of the manual's structure, sections, and content organization for easy navigation.

Conventions

Explains symbols, signal words, and icons used for warnings and important safety information throughout the manual.

Specifications

Technical specifications including dimensions, capacity, power requirements, and temperature performance data.

Safety

Safety Information and Warnings

General safety guidelines, critical warnings, and essential precautions for operating the oven.

Lockout Procedures and Requirements

Detailed steps for safely de-energizing the oven, including requirements and lockout procedures.

Lifting, Carrying, and Panel Safety

Guidelines for safe oven movement, handling, and safety considerations for the door and control panel.

Electrical, Fire, and Maintenance Safety

Precautions for electrical power, fire prevention, and safety during maintenance tasks.

Disconnecting Devices and Lockout

Procedures for disconnecting power, lockout requirements, and emergency stop functionality.

Airflow Switch Safety

Explains the function and location of airflow switches as crucial safety components in LFC ovens.

Theory of Operation

LAC-8 Series Oven Operation

Describes the LAC-8 oven's design, horizontal airflow system, and typical applications.

LFC Specific Operation

Details LFC Class A oven features for safe solvent handling, meeting NFPA 86 requirements.

Damper Control and Settings

Explains the damper mechanism for airflow control and considerations for determining optimal settings.

Protocol 3 Controller Functions

Overview of the Protocol 3 controller's operating modes, dual functionality, and high limit features.

Assembly & Setup

Unpack and Inspection

Procedures for unpacking, inspecting the oven for damage, and checking all supplied components.

Oven Location and Setup

Guidance on selecting an appropriate operating environment and performing basic setup steps.

Wiring and Power Connections

Detailed instructions for making electrical wiring and power connections for the oven.

Operation

Loading the Oven Safely

Instructions for loading products into the oven, emphasizing proper placement and avoiding spills.

Pre-Startup Checklist

Essential checks to perform before powering on and operating the oven for safety and performance.

Operating Procedures

Steps for starting the oven and guidance on using the Protocol 3 controller operating modes.

Maintenance

General Maintenance Checklist

Routine checks for cleanliness, component protection, and user interface inspection.

Safety Component Testing

Procedures for testing critical safety components like airflow switches and purge timers on LFC ovens.

Lubrication and Cleaning

Guidelines for lubricating moving parts and cleaning oven interior surfaces and components.

Routine Tests and Adjustments

Covers airflow switch tests, sensitivity adjustments, and door latch alignment procedures.

Replacing Key Components

Instructions for replacing major components like the controller, heater unit, and fan motor.

Troubleshooting

Troubleshooting Symptoms

Lists common oven symptoms, their probable causes, and suggested remedies for diagnosis.

Error Messages and Alarms

Explains common error messages, their possible problems, and recommended next steps for resolution.

Appendices

Standard Product Warranty

Outlines Despatch's warranty terms, coverage, exclusions, and customer responsibilities for repairs.

Optional Features and Setup

Details on optional equipment setup, including recorders, door locks, interior lights, and alarms.

Mechanical and Electrical Drawings

Information on accessing mechanical drawings and electrical schematics for reference purposes.

Despatch LAC Series Specifications

General IconGeneral
AirflowHorizontal
ConstructionStainless steel interior
Insulationmineral wool
Cooling RateNatural convection cooling
ShelvesAdjustable shelves

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