Lennox Signature XP21 Series User Manual

Page 1
2012 Lennox Industries Inc.
Corp. 1031−L7
Revised August 17, 2012
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 22.
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. INSTALLATION
Unit Placement 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing and Installing Panels 11. . . . . . . . . . . . . . . . .
New or Replacement Line Set 12. . . . . . . . . . . . . . . . . .
Brazing Connections 14. . . . . . . . . . . . . . . . . . . . . . . . . . .
Flushing the System 17. . . . . . . . . . . . . . . . . . . . . . . . . . .
Leak Testing the System 19. . . . . . . . . . . . . . . . . . . . . . .
Evacuating the System 19. . . . . . . . . . . . . . . . . . . . . . . . .
Electrical 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Field Control Wiring 24. . . . . . . . . . . . . . . . . . . . . . . . . . .
Servicing Unit Delivered Void of Charge 26. . . . . . . . . .
Unit Start−Up 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Refrigerant 26. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Handler / Indoor Coil Match ups and Targeted
Subcooling Values 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating and Temperature Pressures 30. . . . . . . . . .
III. SYSTEM OPERATION AND SERVICE
OUTDOOR CONTROL − PART NUMBER 101796−XX
Heat Pump Control (A175) Jumpers and Terminals 31
System Status, Fault and Lockout LED Codes 33. . . .
Component Field Configuration and
Troubleshooting 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OUTDOOR CONTROL − PART NUMBER 103369−XX
Jumpers and Links 47. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuring Unit 48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7−Segment Alert and System Status Codes 51. . . . . . .
Reconfiguring Outdoor Control using icomfort
Thermostat 51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
APPLICABLE TO ALL VERSIONS
Compressor Information and Testing 57. . . . . . . . . . . . .
System Overview 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defrost System 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 67. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SunSource
®
Home Energy System 67. . . . . . . . . . . . . .
Checklists 68. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Wiring Diagrams 69. . . . . . . . . . . . . . . . . . . . . . . . . .
Factory Wiring Diagrams 72. . . . . . . . . . . . . . . . . . . . . . .
Unit Sequence of Operations 75. . . . . . . . . . . . . . . . . . .

Lennox Signature XP21 Series Specifications

General

Brand	Lennox
Model	Signature XP21 Series
Category	Heat Pump
Language	English