Lennox XP14 SERIES

Page 1
©2007 Lennox Industries Inc.
Corp. 0721−L7
XP14
Service Literature
Revised 06−2008
XP14 SERIES UNITS
The XP14 is a high efficiency residential split−system heat
pump unit, which features a scroll compressor and
HFC−410A refrigerant. XP14 units are available in sizes
ranging from 1 1/2 through 5 tons. The series is designed
for use with an indoor unit with an expansion valve ap-
proved for HFC−410A. This manual is divided into sections
which discuss the major components, refrigerant system,
charging procedure, maintenance and operation se-
quence.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are
subject to change.
IMPORTANT
Operating pressures of this HFC−410A unit are
higher than pressures in HCFC−22 units. Always
use service equipment rated for HFC−410A.
WARNING
Warranty will be voided if covered equipment is re-
moved from original installation site. Warranty will
not cover damage or defect resulting from:
Flood, wind, lightning, or installation and opera-
tion in a corrosive atmosphere (chlorine, fluorine,
salt, recycled waste water, urine, fertilizers, or oth-
er damaging chemicals).
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person-
al injury or loss of life. Installation and service must
be performed by a qualified installer or service
agency.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon-
nect switch(es). Unit may have multiple
power supplies.
TABLE OF CONTENTS
Specifications / Electrical Page 2. . . . . . . . . . . . .
I Unit Information Page 3. . . . . . . . . . . . . . . . . . . .
II Unit Components Page 3. . . . . . . . . . . . . . . . . .
III Refrigerant System Page 13. . . . . . . . . . . . . . . .
IV Charging Page 15. . . . . . . . . . . . . . . . . . . . . . . . .
V Service and Recovery Page 20. . . . . . . . . . . . . .
VI Maintenance Page 21. . . . . . . . . . . . . . . . . . . . . .
VII Wiring Diagram Page 22. . . . . . . . . . . . . . . . . . .

Lennox XP14 SERIES Specifications

General

Type	Heat Pump
SEER Rating	Up to 16.00
HSPF Rating	Up to 9.00
Refrigerant	R-410A
Number of Stages	1

Summary

Unit Specifications

Fault and Lockout Codes

Diagnostic Fault Codes and Solutions

Lists diagnostic fault codes, possible causes, and solutions.

Compressor Description

Scroll Compressor Design and Operation

Explains the design, form, and operation of the scroll compressor.

Outdoor Fan Motor

Outdoor Fan Motor (B4) Details

Describes the PSC fan motor, its control, and access for removal.

Refrigerant System Flow

Charging - Leak Testing and Evacuation

Leak Testing Procedures

Steps to detect leaks in the refrigerant system.

System Evacuation Process

Detailed procedure for evacuating the system of non-condensables.

Charging - Refrigerant and Airflow

Refrigerant Charge and System Compatibility

Information on HFC-410A refrigerant charge and unit compatibility.

Indoor Airflow Check Procedure

Charge Calculation and Setup

Setup for Charge Adjustment

Steps for preparing and calculating the correct refrigerant charge.

Indoor Unit Match-Up Charge Calculations

Adding Charge for Indoor Unit Match

Table detailing charge adjustments for various indoor unit matches.

Service and Recovery Precautions

POE Oil and Moisture Handling

Critical precautions for handling POE oils and system moisture.

Annual Maintenance Procedures

Outdoor Unit Maintenance Tasks

Steps for cleaning and inspecting the outdoor unit.

Indoor Coil and Unit Maintenance

Wiring Diagram and Operation Sequence

XP14 Unit Wiring Diagram