Advertisement
Quick Links
The information on the following pages is to help the in-
staller save time, provide the best possible installation and
ensure continuous trouble-free operation.
These instructions apply to the Unico M-Series air han-
dler units. For heat pump coils, 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 Sizing and Layout
Procedure, Bulletin 40-40 and the Component Layout In-
structions, Bulletin 40-30.
Do not attempt to install or startup unit without first read-
ing 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 lat-
est edition of the National Electrical Code and all local
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.
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 re-
vision letter. For example, in UPC-00x the 'x' indicates
the latest revision.
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 in-
stallation. 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.
Advertisement
Related Manuals for Unico M2430B 1 Series
Summarization of Contents
General Information and Safety
Scope of Installation Instructions
Defines the Unico M-Series air handler units covered by these instructions.
Installer and Owner Manual Retention
Instruction to retain the manual at the job site for future reference.
Importance of Building Insulation
Highlights the essential role of building insulation for economical operation.
General Safety Precautions
Provides essential safety guidelines and precautions before installation and operation.
Part Number Revision Guidance
Guidance on referring to the latest revision letters for UPC part numbers.
Available Options and Modules
Unit Unpacking and Inspection
Instructions for inspecting and unpacking the air handler modules.
Unit Location Considerations
Guidance on selecting an optimal location for the air handler unit.
EC Motor Temperature Limitations
Details on operating temperature limits for EC motors to ensure longevity.
Unit Installation Clearance Requirements
Return Air Box Opening Specifications
Table detailing return air box sizes for different unit models.
Horizontal Attic Installation Guide
Diagram and notes for installing the unit in a horizontal attic configuration.
Modular Unit Assembly
Anti-Frost Switch Wire Routing
Procedure for routing anti-frost switch wires during module connection.
Securing Unit Modules Together
Instructions on how to fasten and secure interconnected unit modules.
Horizontal Unit Installation Guidelines
Guidance for assembling and configuring units for horizontal airflow.
Vertical Unit Installation Procedures
Cooling Module Reconfiguration for Vertical Install
Steps to reconfigure the cooling module's access panel for vertical installation.
Vertical Plenum Module Installation
Details on installing the vertical plenum module and its requirements.
Return Air Adapter Installation
Procedure for attaching the return air adapter to the vertical plenum module.
Vertical Upflow Air Handler Assembly
Cooling Module to Vertical Base Installation
Steps for mounting the cooling module onto the vertical base unit.
Blower Module Installation
Instructions for installing the blower module onto the assembled unit.
Heating-Only System Assembly
Guidance for assembling heating-only Unico systems.
Control Box Mounting and Wiring
Secondary Drain Pan Installation
Procedure for installing a secondary drain pan to prevent water damage.
Unit Mounting Options
Overview of different mounting methods for the air handler units.
Horizontal Platform Mounting
Guidance on mounting the unit horizontally on a platform.
Horizontal Suspended Mounting
Caution Against Hanging from Top of Unit
Warning against hanging the unit from its top cabinet to prevent distortion.
Vertical Unit Mounting
Recommendations for mounting vertical units, advising against suspension.
Duct Connections and Adapters
Information on connecting ducts and using supply plenum adapters.
Restrictor Plate for Airflow Tuning
Checking Motor Amperage for Airflow
Guidance on measuring motor amperage to verify system airflow.
Measuring Outlet Airflow
Procedure for measuring airflow from each outlet to verify total system airflow.
Measuring Static Pressure
Instructions on how to measure static pressure in the supply plenum.
Return Air Duct System Requirements
Multiple Return Air System Configuration
Information on using the MR module for multiple return air configurations.
Piping Installation Guidelines
General guidelines for piping installation, including condensate and refrigerant lines.
Condensate Line Installation and Pitching
Details on pitching and trapping condensate lines for proper drainage.
Refrigerant Line Connections
Expansion Valve Installation
Procedure for installing the thermostatic expansion valve (TXV) for refrigerant coils.
iSeries Expansion Valve Location Warning
Warning regarding the location of the iSeries expansion valve in the outdoor unit.
Hot Water Coil Connections
Evaporator Coil Cleaning Procedure
Instructions for cleaning the coil to ensure proper performance and drainage.
Electrical Wiring Instructions
Blower Power Supply Specifications
Table detailing power supply specifications for various blower models.
Control Box Mounting and Wiring Options
Details on mounting the control box and connecting sensor leads.
ST2 Control Box Operation
Cooling-Only System Wiring Diagram
Wiring diagram for a cooling-only Unico system configuration.
Heat Pump System Wiring Diagram (No Electric Heat)
Wiring diagram for heat pump systems without supplemental electric heat.
Ventilation Speed Mode Adjustment
Instructions on adjusting the fan speed for ventilation mode.
ST2 Control Box Wiring Diagram with Motor Controller
Wiring Diagram Notes and Warnings
Important notes and warnings related to the ST2 control box wiring diagram.
ST2 Control Box Wiring Schematic (Cooling/Heat Pump, No Supplemental Heat)
Wiring Schematic Notes and Warnings
Notes and warnings associated with the ST2 control box wiring schematic.
ST2 Control Box Wiring Schematic (Cooling with Hot Water Heat)
Wiring Schematic Notes and Warnings
Notes and warnings pertaining to the ST2 control box wiring schematic.
ST2 Control Box Wiring Schematic (Heat Pump with Electric Heat)
Wiring Schematic Notes and Warnings
Notes and warnings related to the ST2 control box wiring schematic.
ST2 Control Box Wiring Schematic (Heat Pump with Hot Water Heat)
Wiring Schematic Notes and Warnings
Notes and warnings for the ST2 control box wiring schematic.
System Startup Procedures
Sequence of Operation Overview
Describes how the system operates under different modes (cooling, heating).
Cooling Cycle Operation (A/C or Heat Pump)
Explains the sequence of operation for cooling cycles with A/C or heat pumps.
Heating Cycle Operation (Heat Pump)
Details the sequence of operation for heat pump heating cycles.
Heating Cycle Operation (Electric Heat-Only)
Explains the sequence of operation for electric heat-only systems.
Ventilation Cycle Operation
Describes the operation of the unit during ventilation mode.
Checking Airflow
Procedure for checking and verifying system airflow before charging.
Measuring Static Pressure
Checking Motor Amperage
Guidance on measuring motor amperage for airflow verification.
Checking Outlet Airflow
Procedure to measure and sum airflow from all outlets.
How to Measure Static Pressure
Detailed instructions for measuring static pressure in ducts.
Setting Ventilation Speed
Charging the System (Cooling Mode)
Procedure for charging the system in cooling mode, including sub-cooling.
Sub-cooling Method for Charging
Detailed explanation of the sub-cooling method for system charging.
Caution Against Adding Liquid Charge to Suction Port
Warning against adding liquid charge to the compressor suction port.
Superheat Method for Verification
Charging by Gauge Pressures
Clarification on using gauge pressures for system charging verification.
Using a Low Ambient Control Kit
Guidance on installing and using low ambient control kits for cold weather operation.
R-410A Refrigerant Information
Information on R-410A refrigerant and its environmental context.
Unit Maintenance Procedures
Caution Regarding Wheel Balance and Assembly Removal
Warning on handling the blower assembly to prevent damage to wheel balance.
R-22/410A Saturation Pressure-Temperature (English)
Table of saturation pressures and temperatures for R-22 and R-410A refrigerants.
R-22/410A Saturation Pressure-Temperature (SI)
Table of saturation pressures and temperatures for R-22 and R-410A refrigerants.
Single Return System Configurations
Horizontal Configuration Chart
Diagram illustrating various horizontal configurations of Unico modules.
Unico System Vertical Installation
Vertical Installation for M2430/3642 Units
Specific instructions for vertical installation of M2430 and M3642 units.
Vertical Installation for M4860 Units
Specific instructions for vertical installation of M4860 units.
Vertical Installation for Multiple Return Systems
Guidance for vertical installation of systems with multiple return modules.
Need help?
Do you have a question about the M2430B 1 Series and is the answer not in the manual?
Questions and answers