Despatch RFD Series - Manual (Page 33)

RFD Oven Series Owner’s Manual M AINTENANCE
Version 1 33
Copyright © 2012 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.
Preventive
Maintenance
(Refer to Section) Daily Weekly Monthly
Every
Three
Months
Every
Six
Months Annually
As
Needed
Check High limit
controller (6.8) X
Verify purge timer
setting (6.4) X
6.3. Check Fans
Check fan operation by closely observing for abnormal movement or sound. Irregular noise or
movement may mean the fan needs repair or replacement. Listen for any irregular noises coming
from the fans.
6.4. Test Purge Timer
Test the Purge timer regularly to ensure continued safe operation:
1. Check the minimum purge time setting on the RFD Oven name plate (Figure 14).
2. Verify the Purge timer is set to the setting on the RFD name plate (Figure 10).
6.5. Test Airflow Switch
Testing the airflow switch ensures that power to the heater is interrupted if the forced
exhaust system is not functioning properly. This section provides an example test
procedure along with a procedure for adjusting the airflow switch. If testing or adjusting
the airflow switch prove unsuccessful, contact Despatch for service information (see
Section 1.2).
6.5.1. To Set or Adjust Airflow Switch
The position of the top of the adjustment screw indicates the switch pressure setting. View the
pressure setting through the slot in the stem (Figure 16). To adjust the airflow switch:
1. Remove the aluminum hex cap on the top of the stem (Figure 16).
2. Increase the setting by turning the inside adjustment screw clockwise (adjustment screw
down).
3. Decrease the setting by turning the inside adjustment screw counter-clockwise (adjustment
screw up).
6.5.2. Example: Verify Exhaust Fan Airflow Switch Setpoint
To test the exhaust fan’s airflow switch setpoint:
1. Set the oven power to ON.