Despatch RFD Series - Manual (Page 28)

O PERATION RFD Oven Series Owner’s Manual
28 Version 1
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
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retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
5.3. Operating Procedure
5.3.1. Check Fan Rotation and Other Preliminaries
1. Check fan rotation after the initial installation
and after reconnecting the power supply to
ensure the fans are running in the correct
direction. To check fan rotation:
a. Momentarily toggle
POWER (Figure 13)
to start fans and check rotation.
b. Rotation should correspond to the
directional arrows provided.
c. Reverse motor rotation where necessary.
2. Verify purge timer (Figure 10) is set to the
correct value as it appears on the Design
Specification (Figure 14) or Table 2.
3. Verify airflow switches:
a. Are properly installed
b. Proper make and break for the contacts
when fans are started and stopped.
c. Refer to Section 3.7 and Section for 6.5
more information on airflow switches.

If polarity is reversed during wiring, the fan will rotate
backwards and compromise proper ventilation.
Figure 13. Power, Heat and Alarm Silence Switches.
Figure 14. Minimum purge time is listed on the
RFD oven design specification label.