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06/11
506586−01
*2P0611*
*P506586-01*
Page 1
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
having jurisdiction before installation.
NOTICE TO INSTALLER
It is critical for proper defrost operation to set the defrost termination
pins (E46) on the heat pump control prior to starting system. See
Defrost System section on page 32 for further details.
DEFROST OPERATION
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 13 to avoid damaging the service valve’s internal seals.
NOTICE
A thermostat is not included and must be ordered
separately.
D The Lennox icomfort Touch
®
 thermostat must be used
in communicating application
D In non−icomfortt applications, the Lennox
ComfortSense
®
 7000 thermostat may be used, as well
as other non−communicating thermostats.
In all cases, setup is critical to ensure proper system
operation.
Field wiring examples for non−icomfort
tapplications
begin on page 25.
See the icomfort Touch
®
 thermostat Quick Start Guide
for communicating and partial communicating field
wiring connections.
INSTALLATION
INSTRUCTIONS
Dave Lennox Signature
®
Collection XP17 System
HEAT PUMPS
506586−01 
06/11
Supersedes 05/11
TABLE OF CONTENTS
General
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Unit Dimensions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Model Number Identification
2
. . . . . . . . . . . . . . . . . . . . 
Typical Unit Parts Arrangement
. . . . . . . . . . . . . . . . . 
Shipping and Packing List
. . . . . . . . . . . . . . . . . . . . . . 
Using Manifold Gauge Set
. . . . . . . . . . . . . . . . . . . . . . 
Operating Service Valves
. . . . . . . . . . . . . . . . . . . . . . . 
Recovering Refrigerant from Existing System
. . . . . 
Unit Placement
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Removing and Installing Panels
. . . . . . . . . . . . . . . . . 
New or Replacement Line Set
. . . . . . . . . . . . . . . . . . . 
Flushing the System
. . . . . . . . . . . . . . . . . . . . . . . . . . . 
Brazing Connections
. . . . . . . . . . . . . . . . . . . . . . . . . . . 
Flushing Line Set and Indoor Coil
. . . . . . . . . . . . . . . . 
Installing Indoor Expansion Valve
. . . . . . . . . . . . . . . . 
Leak Test Line Set and Indoor Coil
. . . . . . . . . . . . . . . 
Evacuating Line Set and Indoor Coil
. . . . . . . . . . . . . 
Electrical
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Heat Pump Control (A175) Jumpers and Terminals
Field Control Wiring
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Servicing Unit Delivered Void of Charge
. . . . . . . . . . 
Unit Start−Up
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
System Refrigerant
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Air Handler / Coil Matchups and Targeted Subcooling
Values
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Operating and Temperature Pressures 
. . . . . . . . . . . 
System Operations
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Defrost System
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
System Status, Fault and Lockout LED Codes
. . . . . 
Field Configuration and Testing
. . . . . . . . . . . . . . . . . . 
Maintenance (Dealer and Homeowner)
. . . . . . . . . . . 
SunSource
®
 Home Energy System
. . . . . . . . . . . . . . 
Start Up and Performance Checklist
. . . . . . . . . . . . . 
General
This outdoor unit 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 XP17
Engineering Handbook for approved indoor component
matchups.
Litho U.S.A.