Danger – Despatch RAD Series User Manual

Page 33

RAD Oven Series

Owner’s Manual

ROUBLESHOOTING

Version 1

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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.

Difficulty

Probable Cause

Suggested Remedy

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

High Limit set too low

Set the High Limit higher.

Protocol 3 controller
malfunction

Replace controller

SCR malfunction

Replace SCR 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
temperature
reaches the High
Limit setting

Protocol 3 controller
malfunction

Replace controller.

SCR malfunction

Replace SCR

Danger!

Electrical panels contain high voltage. Disconnect and lock out
the power supply before working inside any electrical panels.
Failure to lock out the power supply can result in death or injury.