Explosion-Proof
RSR
Fan/Filter Unit
Quick-Start Operating Guide
Doc . 1788-12
©
Copyright 2015 Terra Universal Inc.
All rights reserved
Revised November 2019
Terra Universal, Inc. • TerraUniversal.com • 800 S. Raymond Ave. • Fullerton, CA 92831 • TEL: (714) 578-6000 • FAX: (714) 578-6020
1
IMPORTANT SAFETY INSTRUCTIONS
READ AND SAVE THESE INSTRUCTIONS
Proprietary Notice
This manual pertains to proprietary
devices manufactured by Terra
Universal, Inc. Neither this
document nor any portion of it may
be reproduced in any way without
prior written permission from Terra
Universal.
Safety Notice
A thorough familiarity with all operating guidelines is
essential to safe operation of the product. Failure to
observe safety precautions could result in poor
performance, damage to the system or other
property, or serious bodily injury or death. The
following symbols are intended to call your attention
to two levels of hazard involved in operation.
Terra Universal makes no
warranties applying to information
contained in this manual or its
suitability for any implied or inferred
purpose. Terra Universal shall not
be held liable for any errors this
manual contains or for any
damages that result from its use.
CAUTION
Cautions are used when failure
to observe instructions could
result in significant damage to
equipment.
WARNING
Warnings are used when failure
to observe instructions or
precautions could result in
injury or death.
The information presented here is subject to change without notice.
1.0
Introduction
This manual documents installation and operation of Terra Universal’s Room-Side
Replaceable (RSR) Explosion-Proof WhisperFlow™ Fan/Filter Unit (FFU). The FFU
provides uniform, laminar flow, HEPA-filtered air to the area below the mounted unit.
2.0
Operation
The unit consists of a ¼-HP, explosion-
proof motor driving a forward-curved
centrifugal blower. Air is drawn into the
unit through a pleated pre-filter and in
turn to an insulated chamber where it is
then directed to an exit HEPA filter with
a built-in diffuser.
The unit can also be equipped with a
3/8”-diameter challenge port, shown in
photo to the right. Take differential
pressure measurements to monitor filter performance, and insert aerosols for leak-test
certification. Port is capped when not in use.
3.0
Installation
The RSR WhisperFlow FFU is designed to allow filter replacement from the inside of the
cleanroom, without breaching the seal. A gel-sealed filter can be separated from the fan
module for replacement. The fan module stays in place on top of a standard 2’x4’ clean
room ceiling grid and includes a threaded fixture at each corner to accommodate four
eye-bolts (not provided) that can be used to assist in positioning the unit.
All metal components are grounded. A grounding wire is clipped to metal hardware on the
filter screen as well as the metal threads running through the pre-filter mesh. Make certain
that these wires are in place before final installation.
WARNING:
To reduce the risk of fire, electric shock, or injury to persons, do not
use this fan with any solid-state speed control device, and observe the
following:
A)
Use this unit only in the manner intended by the manufacturer. If you have questions,
contact the manufacturer.
B)
Before servicing or cleaning unit, or replacing a filter, switch power OFF at the
service panel and lock the service disconnecting means to prevent power from being
accidentally switched on. When the service disconnecting means cannot be locked,
securely fasten a prominent warning device, such as a tag, to the service panel.
C)
When the removal/disconnection of either filter is required due to service or
component replacement, they are to be remounted as previously installed.
D)
Installation work and electrical wiring must be done by qualified person(s) in
accordance with all applicable codes and standards, including fire-rated construction.
All metal components must be properly grounded.
E)
When cutting or drilling into a wall or ceiling, do not damage electrical wiring and
other hidden utilities.
4.0
Start up
WARNING:
Keep unit disconnected from power supply during inspection
Prior to providing power to the unit, check that no damage has occurred during shipping.
This can be accomplished via a visual check to make sure there are no visible dents or
penetrations. If the unit is intact, unclip the grounding wire and remove the pre-filter.
Manually rotate the fan wheel to make sure it is not in contact with any stationary parts
and that there are no visible loose screws or bolts obstructing the wheel’s rotation. Once
visual inspection is completed, have a professional perform the installation who is familiar
with Class I, Groups C & D and Class II, Groups F & G hazardous location requirements.
NOTE: Remember to replace the filter-screen and pre-filter grounding wires. After
installation, with power applied, the fan will rotate, and filtered air will exit the HEPA filter.
5.0
Cleaning and Maintenance
WARNING:
Disconnect from power supply before servicing unit or replacing
filters. When servicing or replacing either filter, the new filter is to be
installed in the same manner as the filter it replaces.
The scheduled maintenance of the unit depends on the installed location and consists of
cleaning or changing the pre-filter and the HEPA filter. It is recommended that the pre-
filter be inspected and cleaned every three months or sooner depending on the
cleanliness of the external environment. The HEPA filter cannot be cleaned and must be
replaced when the laminar flow rate falls below 70 feet/min.
Explosion-proof FFU to be installed with wiring embedded in filled rigid conduit.
5.1 Replacing the RSR Filters
The RSR filter is designed so that the HEPA or ULPA filter can be replaced from inside
the cleanroom without breaching the controlled environment. The filter assembly is
detached from the fan module, which stays in place in the ceiling grid. Follow these
instructions to replace the filter.
First, you must remove the outer screen covering the filter that is held in place with friction
catches (Photo 1). This screen protects the filter from damage and enhances airflow
uniformity. While gently pulling on the screen to disengage the catches, detach the
grounding wire clip as shown in Photo 2. The clip is attached to a steel rivet holding one
of the catches in place.
Photo 1
: Friction catches hold the screen to the fan module housing.
Pre-Filter
Lid
Assembly
HEPA/ULPA
Filter
Grounding
Wire
Optional
Challenge
Port
