1
2015 Lennox Industries Inc.
Corp. 1407-L10
August 25, 2015
XC20
INSTALLATION AND SERVICE
PROCEDURE
Service Literature
Elite Series
®
XC20 Units
IMPORTANT
XC20 units have refrigerant piping requirements that are
unique to this unit. Size and install the refrigerant piping
per table 2 (page 14) to ensure proper unit operation.
This unit is an integral component of a system that requires an
iComfort Wi-Fi
®
or iComfort
®
S30 thermostat and
iComfort
®
-enabled air handler or furnace.
XC20
iComfort Wi-Fi
®
thermostat
iComfort
®
-enabled
air handler or
furnace
IMPORTANT:
Before applying any power (main or low voltage) to the outdoor
unit, confirm that the iComfort Wi-Fi
®
or iComfort
®
S30
thermostat has software Version 2.1 or higher installed.
(Reference the iComfort Wi-Fi
®
or iComfort
®
S30 thermostat
manual.)
iComfort
®
S30
thermostat
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.
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 Service Valves 7.......................
General 7.....................................
II. INSTALLATION
Unit Placement 9...............................
Removing and Installing Panels 12.................
New or Replacement Line Set 13..................
Brazing Connections 16...........................
Flushing the System 19...........................
Leak Testing the System 21.......................
Evacuating the System 21.........................
Electrical 24.....................................
Servicing Unit Delivered Void of Charge 29..........
Unit Start-Up 29.................................
III. SYSTEM OPERATION AND SERVICE
7-Segment Alert and System Status Codes 30.......
Outdoor Control Push-Button Operation 38..........
Configuring Unit 42...............................
Reconfiguring Outdoor Control using iComfort Wi-Fi
®
or
iComfort
®
S30 Thermostat 43.....................
System Overview 43.............................
Maintenance 44..................................
Unit Wiring Diagrams 45..........................
Factory Wiring Diagrams 48.......................
Unit Sequence of Operations 50...................
Component Testing 53............................
System Refrigerant 75............................
Appendix - Charging Sticker ....................
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.
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