FläktGroup SEMCO Ascendant Owner'S Manual Download Page 2

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SPECIALIZED

HEALTHY

AIR SOLUTIONS

SPECIALIZED

HEALTHY

AIR SOLUTIONS

OWNER’S MANUAL

ASCENDANT

™

ASCENDANT

™

Introduction   .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . 1
The FläktGroup SEMCO System  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . 1
System Installation   .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . 3

Lifting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Receiving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Mounting Details, Curb Support . . . . . . . . . . . . . 9

Mounting Details, Grid or Pad Support . . . . . . . 10

Sequence of Operation . . . . . . . . . . . . . . . . . . . 16

Programming Parameters . . . . . . . . . . . . . . . . . 16

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

The information in this owner’s manual is furnished for informational use only, is subject to change without notice, and should not be

construed as a commitment by SEMCO LLC. SEMCO LLC assumes no responsibility for any errors that may appear in this owner’s manual.

No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic,

mechanical, recording, or otherwise, without the prior written permission of SEMCO LLC.

This manual describes how to erect, store, clean and
maintain a FläktGroup SEMCO Ascendant™ Series
Active Desiccant System.

Each section provides information to guide the
installation and maintenance of all components that
may be included in the system. However, some
individuals may desire more information about one or
more items of equipment installed in the system. If so,
consult the manufacturer’s manual that accompanies
the equipment or is included with our submittal.

It should also be noted that a section or sections
of this manual might not apply to your system; for
example, it may not include a chilled water or steam
coil. The manual has been prepared to cover the basic
system as well common optional components that may
be included in an Ascendant Series Active Desiccant
System.

INTRODUCTION

THE FLÄKTGROUP SEMCO

SYSTEM

TABLE OF CONTENTS

The Ascendant™ Series is a conventional cooling –
active desiccant hybrid system. Performance is
optimized to deliver and control low dew point air while
minimizing energy input. The system is configurable
as a dedicated outdoor air system (DOAS) or a
recirculated air system.

The heart of this system is a technologically advanced
desiccant wheel. This wheel is constructed of inorganic
and incombustible materials in a honeycomb pattern to
lower pressure drop, thereby saving fan energy.

The Ascendant™ system processes outdoor and/
or return air streams to a moderate leaving coil
temperature condition (when needed), thereby
delivering saturated air to the active desiccant wheel
which promotes highly efficient moisture adsorption,
further depressing the supply air humidity content to
very low dew points.

By employing moderate chilled water or refrigerant
temperatures, the efficiency of the cooling system
employed is high.

An integral modulating bypass damper allows the
cool, moderately dry air leaving the cooling coil to be
mixed with the appropriate quantity of warm, very dry
air leaving the dehumidification wheel to deliver the
required supply air dew point. If tight temperature
control is also required, a small sensible only post
cooling coil is employed.

Regeneration of the desiccant wheel is also achieved
with high energy efficiency. A typical regeneration
airflow quantity is only 20% - 40% of the supply airflow
volume. Only moderate regeneration temperatures
(140˚F to a maximum of 200˚F.) are required, allowing
the use of hot water, steam, direct or indirect fired gas,
or electric heat.

For applications where an exhaust air stream
is available (i.e. hospital operating theaters)
preconditioning the outdoor air with FläktGroup SEMCO
total energy recovery is highly recommended since
it substantially increases overall system energy
efficiency and substantially reduces pre-cooling input
requirements. It also provides valuable winter season
preheat and humidification.

On the supply air side of the wheel, a chilled water or
direct expansion coil provides cool, moist air to the
wheel. The wheel adsorbs the moisture, producing
dry supply air. On the regeneration side of the wheel,
warm, dry air enters the wheel, which desorbs the
moisture allowing it to be exhausted from the system.