06/11
506727−01
*2P0611*
*P506727-01*
Page 1
2011 Lennox Industries Inc.
Dallas, Texas, USA
These instructions are intended as a
general guide and do not supersede
local codes in any way. Consult
authorities having jurisdiction before
installation.
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
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
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.
CAUTION
Physical contact with metal edges and corners while
applying excessive force or rapid motion can result in
personal injury. Be aware of, and use caution when
working near these areas during installation or while
servicing this equipment.
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.
INSTALLATION
INSTRUCTIONS
Merit
®
Series 13HPX
Units
HEAT PUMP UNITS
506727−01
06/11
Supersedes 04/11
Litho U.S.A.
TABLE OF CONTENTS
Shipping and Packing List
. . . . . . . . . . . . . . . . . . . . . .
General
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model Number Identification
. . . . . . . . . . . . . . . . . . . .
Unit Dimensions
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Parts Arrangement
. . . . . . . . . . . . . . . . . . . . .
Caps and Fasteners Torque Requirements
. . . . . . .
Operating Gauge Set and Service Valves
. . . . . . . .
Recovering Refrigerant from Existing System
. . . . .
New Outdoor Unit Placement
. . . . . . . . . . . . . . . . . . .
Removing and Installing Panels
. . . . . . . . . . . . . . . . .
Line Set Requirements
. . . . . . . . . . . . . . . . . . . . . . . .
Brazing Connections
. . . . . . . . . . . . . . . . . . . . . . . . . .
Indoor Refrigerant Metering Device Removal and
Flushing Line Set and Indoor Coil
. . . . . . . . . . . . . . .
Installing New Indoor Metering Device
. . . . . . . . . . .
Leak Test Line Set and Indoor Coil
. . . . . . . . . . . . . .
Evacuating Line Set and Indoor Coil
. . . . . . . . . . . . .
Electrical Connections
. . . . . . . . . . . . . . . . . . . . . . . . .
Unit Start−Up
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Servicing and Weighing In Refrigerant for Units
Delivered Void of Charge
. . . . . . . . . . . . . . . . . . . . . .
Optimizing System Refrigerant Charge
. . . . . . . . . .
System Operation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defrost System
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance (Dealer and Homeowner)
. . . . . . . . . . .
Start−Up and Performance Checklist
. . . . . . . . . . . . . .
Shipping and Packing List
Check the unit components for shipping damage. If you
find any damage, immediately contact the last carrier.
1 Assembled outdoor unit
General
The 13HPX outdoor unit uses HFC−410A refrigerant. This
unit must be installed with a matching indoor blower coil
and line set as outlined in the 13HPX Engineering
Handbook. These outdoor units are designed for use in
check / expansion valve (CTXV) systems only and are not
to be used with other refrigerant flow control devices. An
indoor coil check / expansion valve approved for use with
HFC−410A must be ordered separately and installed prior
to operating the unit.
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