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Corp. 0719-L5
14HPX
Service Literature
Revised April, 2017
INSTALLATION AND SERVICE
PROCEDURE
LOUVERED
NON-LOUVERED
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 Product Specification bulletin. 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.
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...................
General Information 9.............................
Operating Gauge Set and Service Valves 9...........
Unit Placement 12.................................
Removing and Installing Louvers 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 (14HPX-XXX-230-01 through -016)26
Defrost System (14HPX-XXX-230-01 through -016) 26.
System Operation (14HPX-XXX-230-017) 31.........
Defrost System (14HPX-XXX-230-017) 31............
Maintenance 32...................................
Start-Up and Performance Checklist 35..............
Sequence of Operations 36.........................
Servicing Unit Void of Charge 40....................
Start-Up 40.......................................
System Refrigerant 40.............................
The Merit
®
14HPX model is designed for use with
HFC-410A refrigerant only. This unit must be installed with
an approved indoor air handler or coil. See the Lennox
14HPX Product Specification bulletin (EHB) for approved
indoor component matchups.
This outdoor unit is designed for use in systems that use the
following refrigerant metering device:
Check thermal expansion valve (CTXV)
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.
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