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Corp. 0638-L10
14ACX
Service Literature
Revised August, 2018
INSTALLATION AND SERVICE PROCEDURE
LOUVERED
NON-LOUVERED
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 4................................
Unit Dimensions 7.................................
Typical Unit Parts Arrangement 8...................
Component Specifications 9........................
Refrigerant Metering Devices - Indoor Coil 10.........
Operating Manifold Gauge Set and Service Valves 10..
Unit Placement 12.................................
Removing and Installing Louvered Panels 13.........
New or Replacement Line Set 15....................
Brazing Connections 17...........................
Flushing Line Set and Indoor Coil 20................
Installing Indoor Metering Device 21................
Leak Test Line Set and Indoor Coil 22...............
Evacuating Line Set and Indoor Coil 23.............
Electrical Connections 24..........................
System Operation 29..............................
Maintenance 29...................................
Start-Up and Performance Checklist 30..............
Sequence of Operations 31.........................
Servicing Unit Void of Charge 33....................
Unit Start-Up 33..................................
System Refrigerant 33.............................
14ACX 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
14ACX 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
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.
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