Despatch LAC-6 Series User Manual

LAC Series Oven Owner’s Manual TROUBLESHOOTING
Version 106 35
Copyright © 2011 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
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Table 3. Troubleshooting Oven Symptoms.
Symptom
Possible Cause
Next Step
Failure to heat
or heats to
only 35-50
degrees C
No power
Check power source and/or oven and wall fuses
Broken or frayed cord
Replace with new cord
Burned out heater
Replace heater (see Warranty Section 8.1)
Protocol™ malfunction
Replace controller
Loose wire connections
Disconnect power and check connections behind control
panel
Heater relay failure
Replace circuit board
Door switch failure
Replace door switch
Slow heat-up
Improperly loaded
Reduce load or redistribute load in chamber
Low line voltage
Supply sufficient power and proper connections. Check
for circuit overload
Heating element(s) are
burned out
Replace burned out element (see Warranty Section 8.1)
240 volt oven is connected
to a 208V line
Raise line voltage to a 240 volt line or modify oven for
208V operation (consult factory)
Fan motor failure
Replace fan motor
Frequent
heater
element out
Harmful fumes generated
by load
Increase vent opening or discontinue process
Spillage or splattering of
material on heater
elements
Disconnect power and clean oven chamber and elements
Overheating oven
Check the Hi-limit
Erratic or
inaccurate
temperature
Protocol™ Plus Controller
malfunction
Replace Protocol™ Plus Controller
Improper tuning
parameters
Check tuning parameters
Protocol™ Plus Controller
miscalibration
Recalibrate Protocol™ Plus Controller (See Protocol Plus
Owner’s Manual, sections on Calibration)
Hi-limit setting
Hi-limit should be 10-25°C higher than setpoint
Improper offset
Check zone calibration
Excess
surface or
door
temperature
Door seal deterioration
Replace door seal
Improper
airflow
Fan motor failure
Replace fan motor
Fan wheel seated too low
on fan shaft
Adjust fan wheel for 3/16" clearance between wheel and
inlet ring
Unbalanced fan wheel
Replace fan wheel
Excessive
vibration
Dirty fan wheel
Clean fan
Unbalanced fan wheel
Replace fan wheel
Oven will not
control at
setpoint
Hi-limit set too low
Set the Hi-limit higher
Protocol malfunction
Replace control
SSR malfunction
Replace SSR and/or check control output voltage
Air friction of recirculation
fan
Open exhaust air vent. Unit will not control below
minimum operating temperature with vent closed
Heater does
not shut down
until temp.
reaches the
Hi-limit setting
Protocol malfunction
Replace Protocol
SSR malfunction
Replace SSR

Despatch LAC-6 Series Specifications

General

Brand	Despatch
Model	LAC-6 Series
Category	Oven
Language	English