Despatch Stackable LCC/LCD-4 - Manual (Page 17)

Stackable LCC/LCD Oven Owner’s Manual T HEORY OF O PERATION
Version 1.1 17
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.
3.3. HEPA Filters
The Stackable LCC/LCD Ovens use HEPA (High Efficiency Particulate Air) filters limit
particulate size in the
work chamber to 0.3 microns or less. Two different types of filters are
typically used. While both filters are high-temperature filters in that they are designed for use in
thermal processing equipment, the “standard” HEPA filter is rated to 260°C ( 500°F) while the
“high-temperature” HEPA filter is rated to 350°C (662°F).

Each LCC/LCD oven uses one of two types of HEPA filters,
depending on the oven’s maximum temperature. Ovens that can
be heated to 260
°C (500°F) use the Standard HEPA filter. Ovens
that can be heated to 350 °C (662°F) use the High-Temperature
HEPA filter.
However, customers requiring a higher ramp rate while
operating equipment below 260
°C (500°F) may still choose to use
the high-temperature HEPA filter:

Standard HEPA filter ramp rate: 1.25 °C (34.25°F)/minute

High-Temperature HEPA filter ramp rate: 5 °C
(41 °F)/minute
3.3.1. Definitions

Binder: Organic substance used in filter construction to provide the media with structural
strength

Burn-Off: Process for eliminating the binder and D.O.P. contained in the filter from the
manufacturing and testing function.

D.O.P.: Dioctyl Phthalate - Aerosol particles of submicron size used in testing phase to spot
defects or measure filter efficiency.

HEPA: High Efficiency Particulate Air
Filter Packaging, Shipping and Handling
Packaging practice varies among the filter unit manufacturers. Filter
units are typically packaged in cardboard cartons with varying
approaches for strengthening the container and making it impact-
resistant. Shipping cartons are typically marked with a vertical arrow
and "This Side Up" (Figure 3). A filter unit is placed in the carton so
the pleated folds are vertical (running from top to bottom), versus
side to side.

LCC oven chamber temperature transitions must not exceed
1.5°C/minute to maintain class 100 chamber conditions. For ramp
rates greater than 1.5°C/minute and up to 5°C/minute, the LCD model
will maintain class 100 chamber conditions.
THIS SIDE UP
Figure 3. This Side Up Graphic.