02/11 506649−01
*2P0211* *P506649-01*
Page 1
2011 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
having 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 12 to avoid damaging the service valve’s internal seals.
It is critical for proper defrost operation to set the defrost termination
pins (P1) on the defrost control prior to starting system. See Defrost
System section on page 29 for further details.
DEFROST OPERATION
INSTALLATION
INSTRUCTIONS
Merit
®
Series 14HPX Units
HEAT PUMP UNITS
506649−01
02/11
Supersedes 11/10
TABLE OF CONTENTS
Shipping and Packing List 1. . . . . . . . . . . . . . . . . . . . . . . .
General 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model Number Identification 2. . . . . . . . . . . . . . . . . . . . . .
Typical Unit Parts Arrangement 3. . . . . . . . . . . . . . . . . . .
Operating Gauge Set and Service Valves 4. . . . . . . . . . .
Recovering Refrigerant from Existing System 6. . . . . . .
New Unit Placement 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
New or Replacement Line Set 7. . . . . . . . . . . . . . . . . . . . .
Removing and Installing Louvers 9. . . . . . . . . . . . . . . . . .
Brazing Connections 12. . . . . . . . . . . . . . . . . . . . . . . . . . .
Flushing Line Set and Indoor Coil 15. . . . . . . . . . . . . . . .
Installing Indoor Metering Device 16. . . . . . . . . . . . . . . .
Leak Test Line Set and Indoor Coil 17. . . . . . . . . . . . . . .
Evacuating Line Set and Indoor Coil 18. . . . . . . . . . . . .
Electrical Connections 19. . . . . . . . . . . . . . . . . . . . . . . . . .
Servicing Unit Delivered Void of Charge 24. . . . . . . . . . .
Start−Up 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Refrigerant 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Operation 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defrost System 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start−Up and Performance Checklist 36. . . . . . . . . . . . . .
Shipping and Packing List
Check the unit components for shipping damage. If you
find any damage, immediately contact the last carrier.
1 Assembled 14HPX outdoor unit
General
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 Engineering Handbook for approved indoor
component matchups.
IMPORTANT
This model is designed for use in expansion valve
systems only. An indoor expansion valve approved for
use with HFC−410A refrigerant must be ordered
separately, and installed prior to operating the system.
Litho U.S.A.
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