Table of Contents
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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.
TABLE OF CONTENTS
INTRODUCTION ................................................................... 1
IL00004a.CVN
OPTIONS ............................................................................. 2
UNPACKING ......................................................................... 2
LOCATION ............................................................................ 3
UNIT ASSEMBLY .................................................................. 4
MOUNTING ........................................................................... 8
DUCT CONNECTIONS ........................................................ 9
PIPING ................................................................................ 10
WIRING ............................................................................... 13
STARTUP ............................................................................ 21
R-410A Refrigerant ............................................................. 24
Maintenance ....................................................................... 25
Module Configuration Illustrations ........................................ 26
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.
Bulletin 30-20 / Dec. 2010
INSTALLATION MANUAL
FOR
'M' SERIES MODULAR
AIR HANDLER UNITS
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
Horizontal Platform Mounting ......................................... 8
Horizontal Suspended Mounting ..................................... 8
Vertical ........................................................................... 8
Supply Plenum ............................................................. 10
Return Duct .................................................................. 10
Multiple Returns ............................................................ 10
Condensate Lines ........................................................ 10
Refrigerant Lines .......................................................... 11
Water Connections ....................................................... 13
Coil Cleaning ................................................................ 13
Ventilation Speed Mode ............................................... 14
Sequence of Operation ................................................. 21
Checking Airflow ........................................................... 21
Charging the System .................................................... 23
Low Ambient Control Kit ............................................... 24
INTRODUCTION
© Copyright 2010 Unico, Inc.
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Table of Contents
Related Manuals for Unico 3642
Summarization of Contents
GENERAL
SCOPE
Defines the applicability of the installation instructions for Unico "M" Series modular air handler units.
GENERAL PRECAUTIONS AND SAFETY TIPS
Provides essential safety advice and general precautions before installing or operating the unit.
PART NUMBERS
Explains how part numbers are referenced and where to find the latest revision letters.
OPTIONS
UNIT CONFIGURATIONS
Details various module arrangements for heating, cooling, and combined systems, including flow configurations.
UNIT ASSEMBLY
Anti-Frost Switch Wires
Describes how to route and connect anti-frost switch wires when assembling modules.
Fastening Modules Together
Explains the process of connecting modular sections using latches and ensuring gasket compression.
EC Motor Temperature Limits
Details the operating temperature limits for the EC motor and its impact on motor life and performance.
Horizontal Installations
Guides on installing the modular system in a horizontal configuration, including module arrangement.
Vertical Installations
Provides instructions for assembling the modular system in vertical up-flow or down-flow configurations.
Heating-Only Systems
Explains the installation process for heating-only systems, similar to other configurations but without the cooling module.
Control Box
Details the mounting and wiring of the control box, including available options and terminal connections.
Secondary Drain Pan
Emphasizes the mandatory installation of secondary drain pans to prevent water damage and lists applicable part numbers and dimensions.
MOUNTING
Horizontal Platform Mounting
Describes how to mount the unit horizontally on a platform, ensuring proper drain line pitch.
Horizontal Suspended Mounting
Outlines the method for suspending the unit from the ceiling or rafters using chains and angle iron.
Vertical Airflow Installation
Recommends mounting vertical units on platforms or floors due to their top-heavy nature and suggests using a spacer module.
DUCT CONNECTIONS
Supply Plenum
Details the installation of supply plenum adapters and restrictor plates for proper airflow and noise reduction.
Return Duct
Covers the installation of the return duct system, including box, filter, and adapter selection, and pressure loss considerations.
Multiple Returns
Explains the use of the MR module for systems requiring multiple return air openings.
PIPING
Condensate Lines
Instructs on proper installation of condensate drain lines, including pitching, traps, and secondary drain pan requirements.
Refrigerant Coil Connections
Guides on connecting refrigerant coils, including handling pressurized nitrogen and installing expansion valves.
Water Connections
Details the process for connecting hot water and chilled water coils, including venting and freeze protection.
Coil Cleaning
Describes the recommended procedure for cleaning coils to ensure proper performance and condensate drainage.
WIRING
Control Box Wiring
Explains wiring the control box, connecting motor plug, anti-frost switch, and power supply.
Ventilation Speed Mode
Explains how to enable and adjust the constant ventilation feature using the variable speed controller or thermostat.
System Wiring Schematics
Illustrates various wiring diagrams for different system configurations including cooling-only, heat pump, and hot water heating.
STARTUP
Sequence of Operation
Describes the step-by-step operation sequence for cooling, heat pump, and electric heat cycles.
Cooling Cycle Operation
Explains the sequence of operation during the cooling cycle for A/C or heat pump systems.
Heating Cycle Operation
Details the operation sequence for heat pump and electric heat systems during heating mode.
Ventilation Operation
Explains how the fan operates for ventilation, including speed control settings and enabling constant ventilation.
Checking Air Flow
Provides instructions on how to check system airflow, including measuring static pressure and motor amperage.
System Charging and Adjustment
Covers procedures for charging the system using sub-cooling, superheat, and gauge pressures, including low ambient controls and refrigerant types.
MAINTENANCE
Motorized Blower Assembly Removal
Provides a step-by-step guide for removing the motorized blower assembly for service or replacement.
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