Lennox 13ACD Series

Page 1
©2005 Lennox Industries Inc.
Corp. 0518−L8
13ACD
Service Literature
Revised 03−2007
13ACD SERIES UNITS
The 13ACD is a residential split-system condensing unit
with SEER ratings up to 14.80. The series is designed for
use with expansion valves (TXV) or refrigerant flow control
(RFC). All 13ACD units utilize scroll compressors.
13ACD condensing units are available in 1−1/2, 2, 2 -1/2, 3, 3
-1/2, 4 and 5 ton capacities. All major components (indoor
blower and coil) must be matched according to Lennox rec-
ommendations for the compressor to be covered under war-
ranty. Refer to the Engineering Handbook for approved sys-
tem matchups.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are subject
to change.
This manual is divided into sections which discuss the
major components, refrigerant system, charging proce-
dure, maintenance and operation sequence.
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
Refrigerant can be harmful if it is inhaled. Refrigerant
must be used and recovered responsibly.
Failure to follow this warning may result in personal
injury or death.
TABLE OF CONTENTS
Specifications / Electrical Data Page 2. . . . . . . . .
I Unit Components Page 3. . . . . . . . . . . . . . . . . . .
II Refrigerant System Page 5. . . . . . . . . . . . . . . . .
III Charging Page 6. . . . . . . . . . . . . . . . . . . . . . . . .
IV Maintenance Page 11. . . . . . . . . . . . . . . . . . . . . .
V Wiring and Operating Sequence Page 12. . . . .
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
Electrostatic discharge can affect electronic
components. Take precautions during unit instal-
lation and service to protect the unit’s electronic
controls. Precautions will help to avoid control
exposure to electrostatic discharge by putting
the unit, the control and the technician at the
same electrostatic potential. Neutralize electro-
static charge by touching hand and all tools on an
unpainted unit surface before performing any
service procedure.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting
of (CFC’s and HFC’s) as of July 1, 1992. Approved
methods of recovery, recycling or reclaiming must be
followed. Fines and/or incarceration my be levied for
noncompliance.

Lennox 13ACD Series Specifications

General

SEER Rating	13
Compressor	Single-stage
Refrigerant	R-410A
Sound Rating	76 dB
Cooling Capacity (BTU/h)	18, 000 - 60, 000
Voltage	208/230V
Phase	1
Warranty	5-Year Limited Warranty on covered components

Summary

Unit Information and Safety Precautions

13 ACD Series Units Overview

Details the 13ACD as a residential split-system condensing unit with SEER ratings.

Critical Safety Warnings and Precautions

Covers installation, refrigerant handling, electrical hazards, and ESD protection.

Environmental and Regulatory Compliance

Highlights the Clean Air Act regarding refrigerant venting and handling.

Technical Specifications

Unit General Data and Connections

Provides model numbers, tonnage, and refrigerant line sizes.

Outdoor Coil and Fan Specifications

Details net face area, tube diameter, rows, fins, fan motor specs, and airflow.

Electrical Data and Protection

Lists line voltage, overcurrent protection, circuit ampacity, and compressor/fan motor electricals.

Optional Accessories

Lists available optional accessories for the 13ACD units.

Unit Components and Compressor

Outdoor Unit Component Identification

Illustrates and lists key components of the 13ACD outdoor unit.

Control Box Electrical Components

Describes the control box, power sources, contactors, and capacitors.

Scroll Compressor Functionality

Explains the design, operation, and compression process of the scroll compressor.

Refrigerant System and Service Valves

Refrigerant Piping and Line Set Selection

Covers field refrigerant piping, line set types, and recommended sizes.

Service Valves and Gauge Port Operation

Explains the function and use of liquid and vapor line service valves.

Ball Valve Operation and Maintenance

Details the operation and maintenance of ball valves used in the system.

System Preparation and Charging

Pumping Down the System Procedure

Steps for pumping down the system before leak checking or repairs.

Leak Testing Procedures

Methods for leak testing refrigerant lines using HCFC-22 or nitrogen.

System Evacuation Procedure

Critical steps for evacuating the system to remove noncondensables.

Refrigerant Charge Adjustment

Table 4 provides adjustments for line set lengths and charge amounts.

Refrigerant Charging Methods

Discusses charging based on outdoor temperature and metering device type.

Checking Charge with Operating Pressures

Uses Table 7 and 8 to check charge against normal operating pressures.

Maintenance Procedures

Outdoor Coil Cleaning and Inspection

Instructions for cleaning the outdoor coil, including mesh screen removal.

Condenser Fan Motor Maintenance

Notes that the condenser fan motor is prelubricated and sealed.

Visual Inspection and Wiring Checks

Guidance on inspecting for oil leaks and checking wiring connections.

Indoor Coil and Condensate Line Cleaning

Procedures for cleaning the indoor coil and condensate line.

Indoor Unit Maintenance

Covers filter cleaning/replacement and blower speed adjustment.

Wiring Diagrams and Sequence of Operation

13 ACD Wiring Diagram Overview

Presents the electrical wiring diagram for the 13ACD unit.

Component Key and Notes

Defines the key for components and provides important notes on wiring.

Cooling Sequence of Operation

Details the step-by-step process of the unit's cooling cycle.

End of Cooling Demand Sequence

Describes the sequence of events when cooling demand is satisfied.