Lennox XP19

06/09 505,331M
*2P0609* *P505331M*
Page 1
E2009 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
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.
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.
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.
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.
INSTALLATION
INSTRUCTIONS
Dave Lennox Signature
®
Collection XP19 Series
Units
HEAT PUMPS
505,331M
06/09
Supersedes 05/09
Table of Contents
Shipping and Packing List 1. . . . . . . . . . . . . . . . . . . . . .
Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
XP19 Heat Pumps 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Information 2. . . . . . . . . . . . . . . . . . . . . . . . . . .
Recovering Refrigerant from Existing System 4. . . . .
Removing Existing Outdoor Unit 5. . . . . . . . . . . . . . . . .
Positioning New Outdoor Unit 5. . . . . . . . . . . . . . . . . . .
Removing Panels 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
New or Replacement Line Set 8. . . . . . . . . . . . . . . . . . .
Brazing Connections 9. . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing Indoor Unit Metering Device 10. . . . . . . . . . .
Flushing the System 11. . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing New Indoor Unit Metering Device 12. . . . . . . .
Testing for Leaks 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Evacuating the System 14. . . . . . . . . . . . . . . . . . . . . . . . .
Servicing Unit Delivered Void of Charge 15. . . . . . . . . .
Electrical Connections 16. . . . . . . . . . . . . . . . . . . . . . . . .
Start−Up and Charging Procedures 16. . . . . . . . . . . . . . .
System Operations 21. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lennox System Operation Monitor (LSOM) 21. . . . . . .
Defrost System 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Two−Stage Compressor Check−out 30. . . . . . . . . . . . . . .
Homeowner Information 30. . . . . . . . . . . . . . . . . . . . . . . .
Field Operational Checklist 32. . . . . . . . . . . . . . . . . . . . .
Start−up and Performance Checklist 32. . . . . . . . . . . . . .
Shipping and Packing List1
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  Assembled outdoor unit.
1  Bag assembly which contains the followings:
1  Bushing (for low voltage wiring
2  Isolation grommets for liquid and suction lines
ISOLATION GROMMETS (2)
BUSHING (1)
Figure 1. Bag Assembly (Parts)
Litho U.S.A.

Lennox XP19 Specifications

General

Brand	Lennox
Model	XP19
Category	Heat Pump
Language	English

Summary

Shipping and Packing List

Unit Bag Assembly

Details the contents of the bag assembly for the outdoor unit, including bushings and isolation grommets.

Unit Dimensions

Unit Dimensions - Inches (mm)

Provides detailed measurements and diagrams for the outdoor unit's physical size and component layout.

XP19 Heat Pumps Overview

Introduces the XP19 Heat Pumps outdoor unit and its compatibility with HFC-410A refrigerant.

General Information and Refrigerant Recovery

General Information and Codes

Provides guidance on following local codes and ensuring fasteners are tightened appropriately.

Recovering Refrigerant from Existing System

Details procedures for removing HCFC-22 refrigerant from existing systems using various methods.

Outdoor Unit Installation and Positioning

Removing Existing Outdoor Unit

Outlines the steps for safely disconnecting and removing the old outdoor unit from the installation site.

Positioning New Outdoor Unit Clearances

Details mandatory installation clearance requirements for the new outdoor unit.

Unit Placement and Panel Access

Positioning Considerations

Advises on placing the unit away from windows and on slabs, considering sound ordinances and drainage.

Panel Removal and Stabilization

Explains how to remove panels and stabilize the unit on uneven surfaces using brackets.

Refrigerant Line Set and Connections

Refrigerant Line Set Recommendations and Isolation

Recommends line set sizes, lengths, and details isolation procedures for proper installation.

Brazing Connections Procedure

Provides step-by-step instructions and warnings for brazing the line set to the air conditioner unit.

Metering Device and System Flushing

Removing Indoor Unit Metering Device

Explains how to remove the existing HCFC-22 metering device for compatibility with HFC-410A systems.

Flushing the System

Provides crucial instructions for flushing the system with refrigerant to remove contaminants, essential for warranty.

Leak Testing and System Evacuation

Testing for Leaks

Describes the procedure for checking the system for refrigerant leaks using a leak detector.

System Evacuation

Explains the critical process of evacuating the system to remove non-condensables and moisture.

System Servicing and Electrical Setup

Servicing Units Void of Charge

Provides instructions for servicing units that are delivered without a refrigerant charge.

Electrical Connections

Details wiring requirements for supply voltage, grounding, thermostat, and low-voltage connections.

System Testing and Charging

Testing and Charging System

Covers testing system pressures, charging refrigerant, and checking indoor airflow for optimal performance.

Subcooling Method

Details the subcooling method for verifying the system's refrigerant charge accuracy.

System Operations and Diagnostics

System Operations and LSOM Overview

Explains unit operation modes, thermostat functions, and the LSOM diagnostic module.

LSOM Troubleshooting Codes

Provides guidance on interpreting LSOM LED codes for diagnosing system faults.

Defrost System Control

Defrost System Description and Sensors

Describes the defrost control board, its sensors, and diagnostic LEDs for fault detection.

Defrost Cycle Operation and Test Mode

Details how defrost cycles are initiated, terminated, and how to use the test mode for diagnostics.

Maintenance and Compressor Checks

Preventative Maintenance and DCB Diagnostics

Lists essential maintenance checks and explains DCB diagnostic LEDs and fault codes.

Two-Stage Compressor Check-out

Provides a procedure to verify the part- and full-load capacity operation of two-stage compressors.

Homeowner Information and Performance Checks

Heat Pump Operation and Thermostat Settings

Explains heat pump operation characteristics, thermostat functions, and preservice checks.

Performance Checklists

Provides field operational and start-up checklists for verifying system performance.