Lennox XC14-024

Page 1
©2007 Lennox Industries Inc.
Corp. 0704−L2
XC14
Service Literature
Revised 07−2008
XC14 SERIES UNITS
The XC14 is a high efficiency residential split−system con-
densing unit, which features a scroll compressor and
R−410A refrigerant. XC14 units are available in sizes rang-
ing from 1 1/2 through 5 tons. The series is designed for use
with an expansion valve or RFC (approved for use with
R−410A) in the indoor unit. This manual is divided into sec-
tions which discuss the major components, refrigerant sys-
tem, charging procedure, maintenance and operation se-
quence.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are sub-
ject to change.
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
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 operation
in a corrosive atmosphere (chlorine, fluorine, salt,
recycled waste water, urine, fertilizers, or other dam-
aging chemicals).
DANGER
Shock Hazard
Remove all power at disconnect
before removing access panel.
Single phase XC14 units use single-
pole contactors. Potential
exists for electrical shock resulting
in injury or death.
Line voltage exist at all components
(even when unit is not in operation).
IMPORTANT
Operating pressures of this R−410A unit are higher
than pressures in R−22 units. Always use service
equipment rated for R410A.
TABLE OF CONTENTS
General Page 1. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications / Electrical Data Page 2. . . . . . . . .
I Application Page 4. . . . . . . . . . . . . . . . . . . . . . . . .
II Unit Components Page 4. . . . . . . . . . . . . . . . . .
III Refrigeration System Page 8. . . . . . . . . . . . . . .
IV Charging Page 9. . . . . . . . . . . . . . . . . . . . . . . . .
V Service and Recovery Page 21. . . . . . . . . . . . . .
VI Maintenance Page 21. . . . . . . . . . . . . . . . . . . . . .
VII Wiring and Sequence of Operation Page 22. .

Lennox XC14-024 Specifications

General

Brand	Lennox
Model	XC14-024
Category	Heat Pump
Language	English

Summary

UNIT INFORMATION

General Safety Warnings

Consolidates critical warnings, dangers, and important notices for safe operation and installation.

Refrigerant Charging - Initial Steps

Leak Testing Procedures

Outlines the process for checking the system for refrigerant leaks after line set connection.

System Evacuation and Leak Detection

Vacuum Evacuation Process

Details the critical steps for evacuating the system to remove non-condensables.

Airflow Check and Charge Verification

Indoor Coil Delta-T Airflow Check

Details how to check indoor coil airflow using the Delta-T method.

Refrigerant Charge Method Determination

Charging Conditions and Equipment

Outlines conditions and equipment needed for charging the system.

Superheat Charging Method (RFC)

Explains how to charge fixed orifice (RFC) units using the superheat method.

TXV Charging Methods

Approach Method for TXV

Details the approach method for charging units with a TXV.

Subcooling Method for TXV

Explains the subcooling method for charging units with a TXV.

Charging System Setup and Airflow

Indoor Coil Airflow Testing

Provides detailed steps for performing an indoor coil airflow check.

Determining Charge Method Overview

Weigh-In Method for TXV

TXV Charge Verification Methods

Approach Method Verification

Subcooling Method Verification

Fixed Orifice Charging Methods

Weigh-In for Fixed Orifice

Superheat for Fixed Orifice

Service, Recovery, and Maintenance

Service and Recovery Precautions

Wiring Diagrams and Operation Sequence

Cooling Operation Sequence