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Despatch LAC 2-12-8 - 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

  • D
    David PowellAug 14, 2025
    Why Despatch Oven is not heating up properly?
    • D
      Diana HernandezAug 14, 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.
  • J
    John LeeAug 17, 2025
    What to do if my Despatch Oven heats up too slowly?
    • J
      Joseph HuffmanAug 17, 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.
  • V
    victor29Aug 20, 2025
    Why does my Despatch LAC 2-12-8 have erratic temperature?
    • J
      James WhiteAug 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.
  • J
    John DanielsAug 25, 2025
    What causes frequent heater element burnout in Despatch LAC 2-12-8?
    • S
      Samuel SmithAug 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.
  • A
    Allison MillsAug 27, 2025
    Why Despatch LAC 2-12-8 will not control at setpoint?
    • M
      mark55Aug 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.
  • L
    Lauren MoranAug 30, 2025
    Why is the surface or door temperature of my Despatch LAC 2-12-8 excessive?
    • K
      Katherine ChenAug 30, 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.
  • S
    Sean MendozaSep 3, 2025
    What causes excessive vibration in my Despatch LAC 2-12-8 Oven?
    • S
      seth02Sep 3, 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.
  • E
    Emily FlowersSep 7, 2025
    What causes improper airflow in Despatch LAC 2-12-8?
    • L
      Larry MacdonaldSep 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.
  • S
    Sherry BrownSep 10, 2025
    What to do if the heater of Despatch LAC 2-12-8 Oven does not shut down until it reaches the High Limit setting?
    • C
      Claudia SandovalSep 10, 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

Specifications

Dimensions

Physical measurements and overall size details for different oven models.

Capacities

Power

Temperature

Safety

Safety Information

Critical warnings and precautions for operating and maintaining the oven.

Lockout

Procedures for ensuring zero energy state before maintenance or repair.

Maintenance

Electrical Power

Equipment Lockout Requirements

Disconnecting Devices

Airflow Switches: Recirculation and Forced Exhaust

Damper Control

Damper Full Closed Position

Damper Full Open Position

The Protocol 3 Controller

Assembly & Setup

Unpack & Inspect the LAC-8 Series Oven

Set-Up the LAC-8 Series Oven

Wiring & Power Connections

Wire LAC-8 Models 2-12 and 2-18

Operation

Load Oven

Pre-Startup Checklist

Operating Procedure

Start Oven

Maintenance

Checklist

Test Airflow Switch and Purge Timer (LFC only; safety)

Cleaning and Decontamination

Cleaning the LAC-8 Series Oven

Routine Tests

Recirculation and Exhaust Airflow Switch Test Operation

Detailed steps for testing airflow switches crucial for heater operation.

Recirculation And Exhaust Airflow Switch Adjustment

Replacement Parts

Replace the Protocol 3 Controller

Replace Heater Unit

Replace Fan Motor

Troubleshooting

Troubleshooting Symptoms

Common oven issues, their probable causes, and suggested solutions.

Troubleshooting Error Messages and Alarms

Optional High Limit Alarm with Alarm Silence

Despatch LAC 2-12-8 Specifications

General IconGeneral
BrandDespatch
ModelLAC 2-12-8
CategoryOven
LanguageEnglish

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