E2011 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
These instructions are intended as a general guide and do 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
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.
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.
NOTICE TO INSTALLER
UNIT PLACEMENT
It is critical for proper unit operation to place outdoor unit on an elevated surface as described in Unit Placement section on page 7.
BRAZING LINE SET TO SERVICE VALVES
It is imperative to follow the brazing technique illustrated starting on page 11 to avoid damaging the service valve’s internal seals.
INSTALLATION
INSTRUCTIONS
Merit® Series 14ACX UnitsCONDENSING UNITS
506645−01
07/11Litho U.S.A. Supersedes 11/10
TABLE OF CONTENTS
Shipping and Packing List . . . . . . . . . . . . . . . . . . . . . . . . 1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Typical Unit Parts Arrangement . . . . . . . . . . . . . . . . . . . 3 Model Number Identification . . . . . . . . . . . . . . . . . . . . . . 3 Operating Manifold Gauge Set and Service Valves . . . 4 Recovering Refrigerant from Existing System . . . . . . . 6 New 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 Servicing Unit Delivered Void of Charge . . . . . . . . . . . 22 Unit Start−Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 System Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Start−Up and Performance Checklist . . . . . . . . . . . . . . 30
Shipping and Packing List
Check the unit for shipping damage and listed times below are intact. If damaged, or if parts are missing, immediately contact the last shipping carrier.
1 door unit
1
1
General
14ACX Air Conditioners, which will also 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:
SThermal expansion valve (TXV)
SFixed orifice
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