Lennox XC14-036

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 XC14-036 Specifications

General

Brand	Lennox
Model	XC14-036
Category	Heat Pump
Language	English

Summary

XC14 Series Unit Overview

Installation and Service Warning

Warning regarding potential property damage, injury, or death from improper installation or service.

Warranty Voidance Warning

Warning that warranty is voided if equipment is moved or damaged by specific environmental factors.

Electrical Shock Hazard

Danger warning about potential electrical shock from line voltage at all components.

R-410 A Pressure Important Note

Important note that R-410A units have higher operating pressures than R-22 units.

XC14 Unit Components

XC14 Parts Arrangement Overview

Control Box Description

Scroll Compressor Operation

Explains how the scroll compressor works through orbiting and compression cycles.

Scroll Compressor Design Features

Filter Drier Function and Replacement

Condenser Fan Motor Details

Condenser Fan Motor Safety Warning

Critical safety warning regarding electrical shock hazard when servicing the condenser fan motor.

XC14 Refrigerant System

Refrigerant Piping and Line Sets

Details refrigerant piping, line sets, service valves, and Schrader port access.

Service Valve Operation

XC14 System Charging

Refrigerant Leak Testing

Using an Electronic Leak Detector

System Evacuation Procedure

Procedure for evacuating the system to remove noncondensables and moisture.

Evacuation Vacuum Gauge Requirements

R-410 A Charging and Oil Requirements

Guidelines for charging with R-410A, POE oil compatibility, and factory charge adjustments.

Indoor Coil Airflow Check (Delta-T)

Determining Refrigerant Charge Method

Weigh-in Method for TXV Units

TXV Approach Method

TXV Subcooling Method

Weigh-in Method for Fixed Orifice Units

Fixed Orifice Superheat Method

XC14 Service and Recovery

Refrigerant System Moisture Control

Precautions to prevent moisture entry during service and importance of drier replacement.

Use of Recovery Machine

Requirement to use a recovery machine rated for R-410A refrigerant.

XC14 Wiring Diagrams and Sequence of Operation

XC14 Wiring Diagram

Cooling Sequence of Operation

Step-by-step explanation of how the unit operates during cooling mode.