Bulletin 30-20 / Dec. 2010
© Copyright 2010 Unico, Inc.
INSTALLATION MANUAL
FOR
‘M’ SERIES MODULAR
AIR HANDLER UNITS
IL00004a.CVN
GENERAL
The information on the following pages is to help the
installer save time, provide the best possible installation
and ensure continuous trouble-free operation.
SCOPE
These instructions apply to the Unico “M” Series mod-
ular air handler units. For heat pumps, refer to Bulletin
30-24 for additional instructions. Installation instructions
for the air distribution system are covered in Bulletin 30-
05. Before beginning any installation a detailed system
layout must be done in accordance with the System Siz-
ing and Layout Procedure, Bulletin 40-40 and the Com-
ponent Layout Instructions, Bulletin 40-30.
NOTICE TO INSTALLER AND EQUIPMENT
OWNER: RETAIN THIS MANUAL AT THE JOB.
FULL BUILDING INSULATION IS ESSENTIAL
FOR THE MOST ECONOMICAL OPERATION
GENERAL PRECAUTIONS AND SAFETY TIPS
Do not attempt to install or startup unit without first
reading and understanding the appropriate sections in
this manual.
Before operating, be sure the unit is properly grounded.
Installation should be in accordance with all local codes
and regulations and with the National Board of Fire Un-
derwriters regulations. In case of conflict, local codes
take precedence.
All electrical wiring should be in accordance with the
latest edition of the National Electrical Code and all lo-
cal codes and regulations. The unit is safety certified to
UL 1995 and listed with ETL.
Always install a secondary drain pan when an overflow
of condensate could cause damage.
PART NUMBERS
This manual does not always include the latest revision
letter when referring to UPC part numbers. Refer to the
latest Price List and Spec Sheets for the current UPC
revision letter. For example, in UPC-00x the ‘x’ indi-
cates the latest revision.
INTRODUCTION
The Unico System is a complete indoor comfort system
that includes an indoor air handling unit and small duct
system. The air handler and duct system were designed
to operate together to provide the proper airflow in every
installation. The conditioned air is supplied through a
series of 2-inch ducts as a stream of air that entrains and
mixes the room air. This process of aspiration produces a
more even temperature distribution in the room.
The Unico 'M' Modular Series air-handling units consist
of various modules that are easily latched together. The
modules can be arranged in a vertical-up-flow, vertical-
counter-flow and horizontal-flow configuration. They
can be combined as a heating-only, cooling-only, or
heating and cooling air handler unit. See Fig. 1.
All insulated Unico System modules feature closed-cell
insulation for improved sound attenuation. There is no
exposed fiberglass insulation.
TABLE OF CONTENTS
INTRODUCTION ................................................................... 1
OPTIONS ............................................................................. 2
UNPACKING ......................................................................... 2
LOCATION ............................................................................ 3
UNIT ASSEMBLY .................................................................. 4
Anti-Frost Switch Wires .................................................. 4
Fastening Modules Together .......................................... 4
EC Motor Temperature Operating Limits ......................... 4
Horizontal Installation ..................................................... 4
Vertical Installation ......................................................... 5
Control Box ..................................................................... 7
Secondary Drain Pan ..................................................... 7
MOUNTING ........................................................................... 8
Horizontal Platform Mounting ......................................... 8
Horizontal Suspended Mounting ..................................... 8
Vertical ........................................................................... 8
DUCT CONNECTIONS ........................................................ 9
Supply Plenum ............................................................. 10
Return Duct .................................................................. 10
Multiple Returns ............................................................ 10
PIPING ................................................................................ 10
Condensate Lines ........................................................ 10
Refrigerant Lines .......................................................... 11
Water Connections ....................................................... 13
Coil Cleaning ................................................................ 13
WIRING ............................................................................... 13
Ventilation Speed Mode ............................................... 14
STARTUP ............................................................................ 21
Sequence of Operation ................................................. 21
Checking Airflow ........................................................... 21
Charging the System .................................................... 23
Low Ambient Control Kit ............................................... 24
R-410A Refrigerant ............................................................. 24
Maintenance ....................................................................... 25
Module Configuration Illustrations ........................................ 26
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