06/10 506518−01
*2P0610* *P506518-01*
Page 1
E2010 Lennox Industries Inc.
Dallas, Texas, USA
NOTICE
A thermostat is not included and must be ordered
separately.
D The Lennox icomfort Touch thermostat must be used
in communicating applications.
D 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 23.
See the icomfort Toucht 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.
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 XC21
Engineering Handbook for approved indoor component
matchups.
IMPORTANT
This model is designed for use in expansion valve
systems only. An indoor expansion valve approved for
use with HFC−410A refrigerant must be ordered
separately, and installed prior to operating the system.
INSTALLATION
INSTRUCTIONS
Dave Lennox Signature
®
Collection XC21 System
AIR CONDITIONER
506518−01
06/10
Supersedes 05/10
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
TABLE OF CONTENTS
General 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping and Packing List 1. . . . . . . . . . . . . . . . . . . . . .
Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model Number Identification 2. . . . . . . . . . . . . . . . . . . .
Unit Parts Arrangement 3. . . . . . . . . . . . . . . . . . . . . . . .
Operating Gauge Set and Service Valves 4. . . . . . . . .
Recovering Refrigerant from Existing System 6. . . . .
New Outdoor Unit Placement 7. . . . . . . . . . . . . . . . . . .
Removing and Installing Panels 10. . . . . . . . . . . . . . . . .
New or Replacement Line Set 11. . . . . . . . . . . . . . . . . . .
Flushing the System 14. . . . . . . . . . . . . . . . . . . . . . . . . . .
Leak Testing the System 16. . . . . . . . . . . . . . . . . . . . . . .
Evacuating the System 16. . . . . . . . . . . . . . . . . . . . . . . . .
Electrical 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A175 Main Control Jumpers and Terminals 22. . . . . . .
Field Control Wiring 23. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Servicing Unit Delivered Void of Charge 25. . . . . . . . . .
Unit Start−Up 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Refrigerant 25. . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating and Temperature Pressures 29. . . . . . . . . . .
System Operations 30. . . . . . . . . . . . . . . . . . . . . . . . . . . .
A175 Main Control LED System Status
and Alert Codes 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance (Dealer and Homeowner) 42. . . . . . . . . . .
Checklists 50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping and Packing List
Check unit for shipping damage. Consult last carrier
immediately if damage is found.
1 Assembled outdoor unit.
1 Bag assembly which includes the following:
1 Bushing (for low voltage wiring)
2 Isolation grommets for liquid and suction lines
Litho U.S.A.
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