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Despatch LAC 1-67-8 - 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

  • M
    Miranda WilsonAug 14, 2025
    Why Despatch Oven is not heating up properly?
    • F
      Frank RichardsonAug 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.
  • P
    Peter WestAug 17, 2025
    What to do if my Despatch LAC 1-67-8 heats up too slowly?
    • Z
      zmillerAug 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.
  • J
    John MillerAug 20, 2025
    Why does my Despatch LAC 1-67-8 Oven have erratic temperature?
    • D
      dhernandezAug 20, 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.
  • R
    riceisaacAug 25, 2025
    What causes frequent heater element burnout in Despatch LAC 1-67-8?
    • J
      James MasonAug 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.
  • D
    Derek LewisAug 27, 2025
    Why Despatch LAC 1-67-8 will not control at setpoint?
    • D
      Danny DavisAug 27, 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.
  • J
    John LeeAug 31, 2025
    Why is the surface or door temperature of my Despatch Oven excessive?
    • B
      brooke95Aug 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.
  • O
    ortegachristopherSep 3, 2025
    What causes excessive vibration in my Despatch LAC 1-67-8?
    • W
      walterskristenSep 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.
  • D
    Dennis StewartSep 6, 2025
    What causes improper airflow in Despatch Oven?
    • S
      stevenjohnsonSep 6, 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.
  • A
    Aimee NguyenSep 10, 2025
    What to do if the heater of Despatch LAC 1-67-8 does not shut down until it reaches the High Limit setting?
    • M
      myersjesusSep 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

Revision History

About This Manual

Important User Information

Key safety and operational guidelines for users.

Manufacturer, Model Nomenclature & Service

Model Nomenclature

Explanation of model naming conventions for LAC and LFC ovens.

Service

Details on Despatch service network and contact information.

Organization of this Manual

Conventions

Specifications

Dimensions

Physical dimensions, chamber size, and overall size for various models.

Solvent Capabilities

Information on the solvent handling capabilities for LFC series ovens.

Capacities

Specifications for maximum load, shelf load, exhaust, fan, and weight.

Solvent Capacity

Specific solvent capacities in GPH for different oven models.

Power

Electrical specifications including voltage, amperage, wattage, and cord types.

Temperature

Data on time to temperature, recovery time, and temperature uniformity.

Environmental Operating Conditions

Recommended operating environment and conditions for the LAC-8 Series oven.

Safety

Safety Information

Crucial safety warnings and information for oven operation and maintenance.

Lockout

Procedures for ensuring zero energy state before maintenance or repair.

Lockout Requirements

Requirements for safely shutting off all power sources before maintenance.

Lockout Procedure

Step-by-step instructions for performing a lockout procedure.

Door and Panel

Importance of the control panel for operator safety.

Provisions for Lifting and Carrying

Guidelines and cautions for safely lifting and moving the oven.

Maintenance

Checklist

A checklist of essential maintenance tasks for optimal oven performance.

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

Procedure for testing airflow switches and purge timer on LFC models.

Lubrication

Recommendations for lubricating moving parts for smooth operation.

Cleaning and Decontamination

Procedures for cleaning and decontaminating the oven.

Routine Tests

Guidance on performing regular tests to ensure oven function and safety.

Recirculation and Exhaust Airflow Switch Test Operation

Steps to test the recirculation and exhaust airflow switches for proper operation.

Alternative Method of Checking Power, Switches and Timer

Using LED indicators on the circuit board to check system status.

Recirculation And Exhaust Airflow Switch Adjustment

Procedure for adjusting the sensitivity of the airflow switches.

Summary Switch Conditions

Summary of required conditions for proper airflow switch function.

Door Adjustment

Instructions for adjusting the oven door latch for optimal seal.

Replacement Parts

Information on how to order replacement parts from Despatch.

Replace the Protocol 3 Controller

Reference to Protocol 3 Owner's Manual for controller replacement instructions.

Replace Heater Unit

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

Replace Fan Motor

Detailed instructions for replacing the oven's fan motor.

Electrical Power

Fire

Equipment Lockout Requirements

Emergency Stop

Procedure for using the emergency stop function to shut down the oven.

Disconnecting Devices

Power Requirements

Information on power source requirements and use of power stabilizers.

Disconnecting Hard-Wired Units

Instructions for disconnecting permanently wired oven models.

Disconnecting Corded Units

How to disconnect ovens that use a power cord.

Disconnecting Units with Optional Disconnect Switch

Procedure for using the optional disconnect switch.

Airflow Switches: Recirculation and Forced Exhaust

Theory of Operation

The LAC-8 Series Oven

Describes the digitally-controlled, horizontal recirculating airflow system of the LAC-8.

LFC Specific Operation

Details Class A compliant features and safety measures for LFC ovens.

Damper Control

Explains the function and adjustment of the manual damper mechanism.

Determining Damper Settings

Guidance on setting dampers based on operating factors for optimal results.

Damper Full Closed Position

Effects of the damper in the fully closed position on heat-up and power.

Damper Full Open Position

Effects of the damper in the fully open position on temperature.

Exhaust Damper Control for LFC-8

How the exhaust damper aids in pressurizing the LFC oven chamber.

Other Damper Settings

Discusses damper settings influencing uniformity and cool-down rates.

The Protocol 3 Controller

Overview of the microprocessor-based digital temperature controller and its modes.

Assembly & Setup

Unpack & Inspect the LAC-8 Series Oven

Instructions for unpacking and inspecting the oven for shipping damage.

If Damaged During Shipping

Steps to take if the oven is received with shipping damage.

Set-Up the LAC-8 Series Oven

Procedures for setting up the LAC-8 Series oven.

Select Oven Location;Operating Environment

Guidelines for selecting an appropriate installation location and environment.

Set-up Procedure

General warnings and cautions related to the oven setup procedure.

Wiring & Power Connections

Instructions for connecting the oven to the electrical power supply.

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

Detailed instructions for wiring specific LAC-8 models.

Operation

Load Oven

Guidelines and warnings for safely loading items into the oven.

Pre-Startup Checklist

Essential checks to perform before starting the oven for operation.

Operating Procedure

Step-by-step instructions for operating the oven.

Start Oven

Step-by-step instructions for starting the oven and its fan.

Working with Protocol 3 Operating Modes

Guidance on using the various operating modes of the Protocol 3 controller.

Troubleshooting

Troubleshooting Symptoms

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

Circuit Board Troubleshooting

Troubleshooting steps based on LED indicators on the circuit board.

Troubleshooting Error Messages and Alarms

Common error messages and alarms, their problems, and recommended next steps.

Appendices

Standard Products Warranty

Details the terms and conditions of the standard product warranty.

LAC-8 Series Oven Options

Descriptions of optional features available for the LAC-8 Series oven.

Optional MRC5000 Recorder Setup

Instructions for setting up the optional MRC5000 recorder with the controller.

Optional Pneumatic and Electronic Door Lock

Description of the optional electronic door lock feature.

Optional Interior Light

Description of the optional interior light feature.

Optional Door Interlock Switch (Controls Heater & Fan)

Description of the optional door interlock switch for safety.

Optional High Limit Alarm with Alarm Silence

Description of the optional high limit alarm and how to silence it.

Optional Forced Exhaust

Description of the optional forced exhaust fan for increased cooling.

Optional Clean Dry Air (CDA);Nitrogen

Description of the optional CDA/Nitrogen feature for moisture removal.

Mechanical Drawings

Electrical Schematics

Despatch LAC 1-67-8 Specifications

General IconGeneral
BrandDespatch
ModelLAC 1-67-8
CategoryOven
LanguageEnglish

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