Page 1

WARNING

Improper installation, adjustment, alteration, service

or maintenance can cause property damage, personal

injury or loss of life. Installation and service must be

performed by a licensed professional HVAC installer or

equivalent, service agency, or the gas supplier.

IMPORTANT

The Clean Air Act of 1990 bans the intentional venting of

refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992.

Approved methods of recovery, recycling or reclaiming

must be followed. Fines and/or incarceration may be

levied for noncompliance.

CAUTION

As with any mechanical equipment, contact with sharp

sheet metal edges can result in personal injury. Take

care while handling this equipment and wear gloves and

protective clothing.

WARNING

Electric Shock Hazard. Can cause injury or

death. Unit must be properly grounded in

accordance with national and local codes.

Line voltage is present at all components when

unit is not in operation on units with single-

pole contactors. Disconnect all remote electric

power supplies before opening access panel.

Unit may have multiple power supplies.

ML14XC1

3-PHASE

Table of Contents

Model Number Identication ...........................................2

Typical Serial Number Identication ...............................2

Specications ................................................................3

Electrical Data ...............................................................3

Unit Dimensions – Inches (mm) ....................................4

Typical Unit Parts Arrangement ..................................... 5

Operating Gauge Set and Service Valves ......................6

Installation ......................................................................8

Unit Placement ..............................................................8

Removing and Installing Louvered Panels ...................10

New or Replacement Line Set ...................................... 11

Brazing Connections ...................................................13

Flushing Line Set and Indoor Coil ................................16

Installing Indoor Metering Device .................................17

Leak Testing the System .............................................18

Evacuating Line Set and Indoor Coil ...........................19

Electrical – Circuit Sizing and Wire Routing ..................20

Maintenance ...............................................................24

Typical Field Wiring ......................................................26

Servicing Units Delivered Void of Charge ...................26

Unit Start-Up ...............................................................27

System Refrigerant .....................................................27

Service Literature

UNIT INFORMATION

Corp. 100047

April 21, 2022

ML14XC1 (HFC-410A) SERIES OUTDOOR UNITS (3-PHASE)

IMPORTANT

This unit must be matched with an indoor coil as specied

with AHRI. For AHRI Certied system match-ups and

expanded ratings, visit www.LennoxPros.com. Coils

previously charged with HCFC-22 must be ushed.

General Information

This ML14XC1 outdoor air conditioner with all-aluminum

coil is designed for use with HFC-410A refrigerant only.

This unit must be installed with an approved indoor air

handler or coil. For AHRI Certied system match-ups and

expanded ratings, visit www.LennoxPros.com. These in-

structions are intended as a general guide and do not su-

persede local codes in any way. Consult authorities hav-

ing jurisdiction before installation.

This outdoor unit is designed for use in systems that use

the following refrigerant metering device:

• Thermal expansion valve (CTXV)

IMPORTANT: Special procedures are required for clean-

ing the aluminum coil in this unit. See page 24 in this man-

ual for information.

Lennox ML14XC1 Series

Table of Contents

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