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Unico M4860 User Manual

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INSTALLATION MANUAL
FOR ‘M’ SERIES
AIR HANDLER UNITS
BULLETIN 30-020
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Unico M4860 Specifications

General IconGeneral
Model NumberM4860
Cooling Capacity48, 000 BTU/H
Phase1
Fan Motor HP1.5 HP
Weight250 lbs
Airflow1600 CFM
Voltage208/230V

Summary

Electrical Wiring Safety Precautions

Installation Location Considerations

EC Motor Temperature Guidelines

EC Motor Normal Operating Limit

Recommended temperature range for the EC motor to ensure maximum service life.

EC Motor Maximum Operating Limit

Absolute temperature limit for the EC motor and its impact on performance and lifespan.

EC Motor Temperature Table

Table showing normal and maximum operating temperature limits for the EC motor.

Vertical Unit Installation Guidelines

Cooling Module Vertical Orientation Warning

Critical warning against rotating cooling modules sideways to ensure proper drainage and prevent damage.

Control Box Mounting and Wiring

Secondary Drain Pan Installation

Unit Mounting Methods

M1218 Vertical Mounting Procedure

Piping Installation Guidelines

Refrigerant Connections.

Details on connecting refrigerant lines, including liquid/vapor lines and adapter types.

Refrigerant Line Size Table

Table specifying refrigerant line sizes and connection types for different outdoor units.

Nitrogen Charge Release

Refrigerant Connection Cap Removal

Brazing Safety: Nitrogen Purge

Thermostatic Expansion Valve (TXV) Installation

Non-iSeries TXV Installation

Procedure for installing the TXV on cooling coils for non-iSeries systems.

iSeries TXV Location Warning

Critical warning for iSeries systems: do not install TXV indoors; it's located outdoors.

TXV Installation: Liquid Line Ties

Expansion Valve Model Number Table

Teflon O-ring and Nut Connection

Upper Connecting Nut Attachment

Equalizer and Bulb Line Routing

Refrigerant Line Set Connections

iSeries Specific Connections

Specific procedures for connecting small tubes and distributor nuts for iSeries units.

General Line Set Connection

Procedures for connecting refrigerant lines, including bulb placement, clamping, and line set connection.

Electrical Wiring Procedures

Electrical Disconnect Safety Warning

Critical safety warning: disconnect electrical supply before wiring to prevent electrocution.

Airflow Measurement and Verification

Blower Operation Caution

Caution against operating the blower under low static pressure or free discharge conditions to prevent motor overload.

Airflow and Static Pressure Measurement

Refrigerant System Charging

Refrigerant Venting Prohibition

Critical warning against venting refrigerant, emphasizing legal compliance and use of recovery devices.

Sub-cooling Charging Method

Procedure for charging the system based on sub-cooling measurements during cooling mode.

Sub-cooling Measurement Procedure

Compressor Damage Warning: Liquid Charge

Heat Pump Lines Strapping Caution

Superheat Verification Method

Superheat Measurement Steps

R410A Saturation Pressure Table

Gauge Pressure Limitations for Charging

Unit Maintenance Procedures

Blower Assembly Handling Caution

Critical caution for handling the blower assembly to prevent wheel damage or imbalance.

M-Series Vertical Installation Assembly

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