Despatch LAC 2-18-8 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:

O
Oscar SmithAug 14, 2025
Why Despatch LAC 2-18-8 is not heating up properly?
- M
  mccartymiguelAug 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.
A
Angela BrowningAug 17, 2025
What to do if my Despatch Oven heats up too slowly?
- A
  angelafuentesAug 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.
H
hramosAug 20, 2025
Why does my Despatch Oven have erratic temperature?
- T
  Tammy SmithAug 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.
C
Christina FosterAug 25, 2025
What causes frequent heater element burnout in Despatch Oven?
- C
  Christian HowardAug 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
Amanda GrantAug 27, 2025
Why Despatch Oven will not control at setpoint?
- J
  Jesse FigueroaAug 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.
R
Rebecca StanleyAug 30, 2025
Why is the surface or door temperature of my Despatch LAC 2-18-8 excessive?
- R
  Rebecca WuAug 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.
T
toddmillerSep 3, 2025
What causes excessive vibration in my Despatch LAC 2-18-8?
- R
  robersonjacobSep 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.

Despatch LAC 2-18-8 Specifications

General

Brand	Despatch
Model	LAC 2-18-8
Category	Oven
Language	English

Summary

Warning!

Hi-Limit Controls

Information and recommendation regarding hi-limit controls for ovens.

Specifications

Solvent Capabilities

Safety

Safety Information

General safety guidelines and warnings for oven operation.

Lockout

Procedures and requirements for electrical lockout.

Lockout Requirements

Specific requirements for safely locking out power sources.

Lockout Procedure

Step-by-step instructions for performing a lockout.

Electrical Power

Fire

Equipment Lockout Requirements

Emergency Stop

How to use the emergency stop function.

Disconnecting Devices

Power Requirements

Disconnecting Hard-Wired Units

How to disconnect ovens that are hard-wired.

Capacities

Solvent Capacity

Power

Temperature

Door and Panel

Provisions for Lifting and Carrying

Maintenance

Checklist

Disconnecting Corded Units

Disconnecting Units with Optional Disconnect Switch

Airflow Switches: Recirculation and Forced Exhaust

Theory of Operation

The LAC-8 Series Oven

LFC Specific Operation

Damper Control

The Protocol 3 Controller

Assembly & Setup

Unpack & Inspect the LAC-8 Series Oven

If Damaged During Shipping

Set-Up the LAC-8 Series Oven

Select Oven Location/Operating Environment

Set-up Procedure

Wiring & Power Connections

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

Operation

Load Oven

Pre-Startup Checklist

Operating Procedure

Start Oven

Working with Protocol 3 Operating Modes

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

Cleaning and Decontamination

Cleaning the LAC-8 Series Oven

Decontaminating the LAC-8 Series Oven

Routine Tests

Recirculation and Exhaust Airflow Switch Test Operation

How to test the recirculation and exhaust airflow switches.

Alternative Method of Checking Power, Switches and Timer

Recirculation And Exhaust Airflow Switch Adjustment

Summary Switch Conditions

Door Adjustment

Replacement Parts

Replace the Protocol 3 Controller

Replace Heater Unit

Replace Fan Motor

Troubleshooting

Troubleshooting Symptoms

Lists common symptoms, causes, and remedies for oven issues.

Troubleshooting Error Messages and Alarms

Optional High Limit Alarm with Alarm Silence

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