Lennox XP21 Series User Manual

Page 1
2013 Lennox Industries Inc.
XP17
Service Literature
Corp. 1023-L3
Revised December 2013
INSTALLATION AND SERVICE
PROCEDURE
XP17 (HFC-410A) SERIES UNITS
NOTICE
A thermostat is not included and must be ordered
separately.
 A Lennox iComfort-enabled 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 61.
See the iComfort-enabled 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.
Accessories
For update-to-date information, see any of the following
publications:
 Lennox XP17 Product Specification Bulletin (EHB)
 Lennox Product Catalog
 Lennox Price Book
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 and Service Valves 6.........
II. SYSTEM OPERATION AND SERVICE
Jumpers, Loop and Terminals (101797-XX) 8.......
System Operations 10............................
System Status, Fault and Lockout LED Codes 14....
Component Field Configuration and
Troubleshooting 19...............................
Jumpers and Links (103369-01 and -02) 26.........
Jumpers and Links (103369-03) 27.................
Configuring Unit 28...............................
7-Segment Alert and System Status Codes 31.......
Reconfiguring Outdoor Control using iComfort
-enabled Thermostat 37...........................
Routine Maintenance 37..........................
SunSource
®
Home Energy System 38..............
Sound Cover (SR1) Disassembly and Assembly 38..
Start-Up and Performance Checklist 40.............
Unit Wiring Diagrams 41..........................
Factory Wiring Diagrams 45.......................
Load Shed Wiring 49.............................
Unit Sequence of Operations 52...................
III. INSTALLATION
Unit Placement 57...............................
Removing and Installing Panels 60.................
Electrical 61.....................................
Field Control Wiring 63...........................
New or Replacement Line Set 65..................
Flushing the System 70...........................
Brazing Connections 67...........................
Leak Testing the System 72.......................
Evacuating the System 72.........................
IV. SYSTEM CHARGE
Servicing Unit Delivered Void of Charge 76..........
Unit Start-Up 76.................................
System Refrigerant 76...........................
APPENDIX A - UNIT CHARGING STICKERS

Lennox XP21 Series Specifications

General

Type	Heat Pump
Refrigerant	R-410A
SEER Rating	21
Cooling Capacity	2-5 tons
Heating Capacity	2-5 tons
Warranty	10-Year Limited Warranty on compressor and covered components

Summary

Overview

Model Number Identification

Explains how to identify model numbers based on code.

Specifications

Lists unit specifications, including sound rating and refrigerant charge.

Electrical Data

Provides electrical specifications for compressor and condenser fan components.

System Operation and Service

Jumpers, Loops and Terminals

Details jumpers, loops, and terminals on the heat pump control board.

Compressor Protection Features

Covers anti-short delay, pressure switches, and 5-strike lockout for compressor.

System Status, Fault and Lockout LED Codes

Explains LED codes for system status, faults, and lockouts on the control board.

Installation

Unit Placement Considerations

Guidelines for unit positioning, clearances, and stabilization on various surfaces.

Electrical and Wiring Procedures

Covers electrical connections, grounding, wire routing, and control wiring diagrams.

Refrigerant Line Set and Connections

Information on line set requirements, installation, brazing, and safety precautions.

System Charge

Unit Start-Up

Steps to follow for initial unit start-up, including safety checks and power.

System Refrigerant

Procedures for connecting gauge sets and checking refrigerant charge.

Subcooling Charging Method

Detailed steps for verifying refrigerant charge using the subcooling method.