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2013 Lennox Industries Inc.
Corp. 1031-L7
Revised December 2013
XP21
INSTALLATION AND SERVICE
PROCEDURE
Service Literature
Dave Lennox Signature
®
Collection XP21 Series Units
NOTICE
A thermostat is not included and must be ordered
separately.
The Lennox iComfort thermostat must be used in
communicating applications.
In non-communicating 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-communicating
applications begin on page 72.
See the iComfort thermostat Quick Start Guide for
communicating and partial communicating field wiring
connections.
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.
TABLE OF CONTENTS
I. OVERVIEW
Model Number Identification 2....................
Typical Serial Number Identification 2..............
Specifications 2.................................
Electrical Data 3................................
Unit Dimensions 4..............................
Typical Unit Parts Arrangement 5.................
Operating Gauge Set 6..........................
General 6......................................
II. SYSTEM OPERATION AND SERVICE
Jumpers, Loop and Terminals (101796-XX) 8.......
System Status, Fault and Lockout LED Codes 11....
Component Field Configuration and
Troubleshooting 16...............................
Jumpers and Links (103369-01 and -02) 25.........
Jumpers and Links (103369-03) 26.................
Configuring Unit 29...............................
Reconfiguring Outdoor Control using iComfort
Thermostat 32...................................
Compressor Information and Testing 38.............
System Overview 42.............................
Defrost System 42...............................
Maintenance 48..................................
SunSource
®
Home Energy System 48..............
Checklists 49....................................
Unit Wiring Diagrams 50..........................
Factory Wiring Diagrams 53.......................
Load Shed Wiring 56.............................
Unit Sequence of Operations 59...................
III. INSTALLATION
Unit Placement 66...............................
Removing and Installing Panels 69.................
Electrical 70.....................................
Field Control Wiring 72...........................
New or Replacement Line Set 74..................
Brazing Connections 76...........................
Flushing 79.....................................
Leak Testing 81..................................
Evacuating 81...................................
IV. SYSTEM CHARGE
Servicing Unit Delivered Void of Charge 85..........
Unit Start-Up 85.................................
System Refrigerant 85............................
APPENDIX A - UNIT CHARGING STICKERS
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