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Corp. 1502-L7
ML14XC1
Service Literature
September, 2018
INSTALLATION AND SERVICE PROCEDURE
ML14XC1 (HFC-410A) SERIES UNITS WITH ALL-ALUMINUM COIL
This literature is intended as a general guide and does not
supersede local codes in any way. Consult authorities who
have jurisdiction before installation.
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property.
Installation and service must be performed by a licensed
professional installer (or equivalent) or a service agency.
IMPORTANT
This unit must be matched with an indoor coil as
specified in Lennox Engineering Handbook. Coils
previously charged with HCFC-22 must be flushed.
WARNING
Electric Shock Hazard. Can cause injury
or death. Unit must be 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.
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.
TABLE OF CONTENTS
Model Number Identification 2......................
Typical Serial Number Identification 2..............
Specifications 2.................................
Electrical Data 3................................
Unit Dimensions 3.................................
Typical Unit Parts Arrangement 4...................
Component Specifications 5........................
Refrigerant Metering Devices - Indoor Coil 5..........
Operating Manifold Gauge Set and Service Valves 5...
Unit Placement 7..................................
Removing and Installing Louvers 8..................
New or Replacement Line Set 9.....................
Brazing Connections 11...........................
Flushing Line Set and Indoor Coil 14................
Installing Indoor Metering Device 15................
Leak Test Line Set and Indoor Coil 16...............
Evacuating Line Set and Indoor Coil 17.............
Electrical Connections 18..........................
System Operation 22..............................
Maintenance 22...................................
Start-Up and Performance Checklist 23..............
Typical Field Wiring 24.............................
Servicing Unit Void of Charge 26....................
Unit Start-Up 26..................................
System Refrigerant 26.............................
ML14XC1 Air Conditioners, which will be referred to in this
instruction as the outdoor unit, uses HFC-410A
refrigerant. This outdoor unit must be installed with a
matching indoor unit and line set as outlined in the Lennox
ML14XC1 Engineering Handbook.
This outdoor unit is designed for use in systems that use
one of the following refrigerant metering devices:
Thermal expansion valve (TXV)
Fixed orifice
IMPORTANT: Special procedures are required for
cleaning the aluminum coil in this unit. See page 22 in this
manual for information.
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