06/11
506601−01
*2P0611*
*P506601-01*
Page 1
E
20 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 (E47) on the heat pump control prior to starting system. See
Defrost System
section on page 33 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−icomfort
t
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
t
applications
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 XP21 System
HEAT PUMPS
506601−01
06/11
Supersedes 05/11
TABLE OF CONTENTS
General
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Dimensions
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model Number Identification
2
. . . . . . . . . . . . . . . . . . . .
Typical Unit Parts Arrangement
3
. . . . . . . . . . . . . . . . .
Shipping and Packing List
4
. . . . . . . . . . . . . . . . . . . . . .
Using Manifold Gauge Set
4
. . . . . . . . . . . . . . . . . . . . . .
Operating Service Valves
4
. . . . . . . . . . . . . . . . . . . . . . .
Recovering Refrigerant from Existing System
6
. . . . .
Unit Placement
7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing and Installing Panels
9
. . . . . . . . . . . . . . . . .
New or Replacement Line Set
11
. . . . . . . . . . . . . . . . . . .
Brazing Connections
13
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Flushing Line Set and Indoor Coil
16
. . . . . . . . . . . . . . . .
Installing Indoor Expansion Valve
17
. . . . . . . . . . . . . . . .
Leak Test Line Set and Indoor Coil
18
. . . . . . . . . . . . . . .
Evacuating Line Set and Indoor Coil
18
. . . . . . . . . . . . .
Electrical
20
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heat Pump Control (A175) Jumpers and Terminals
23
Field Control Wiring
25
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Servicing Unit Delivered Void of Charge
27
. . . . . . . . . .
Unit Start−Up
27
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Refrigerant
27
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Handler / Coil Match up and Targeted
Subcooling Values
30
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating and Temperature Pressures
31
. . . . . . . . . . .
System Operations
32
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defrost System
33
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Status, Fault and Lockout LED Codes
43
. . . . .
Field Component Configuration and Testing
48
. . . . . . .
Maintenance (Dealer and Homeowner)
55
. . . . . . . . . . .
SunSource
®
Home Energy System
57
. . . . . . . . . . . . . .
Checklists
57
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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 XP21
Engineering Handbook for approved indoor component
match ups.
Litho U.S.A.
