Lennox 13ACC Series - User Manual

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2002 Lennox Industries Inc.
Corp. 0219−L5
13ACC
Service Literature
13ACC SERIES UNITS
The 13ACC is a residential splitsystem condensing unit
with SEER ratings up to 14.80. The series is designed for
use with expansion valves (TXV) and RFC. All 13ACC units
utilize scroll compressors.
13ACC condensing units are available in 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 recommen
dations for the compressor to be covered under warranty.
Refer to the Engineering Handbook for approved system
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 person
al injury or death.
TABLE OF CONTENTS
General 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Data 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I Unit Components 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
II Refrigerant System 6. . . . . . . . . . . . . . . . . . . . . . . . . . .
III Charging 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IV Maintenance 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V Wiring and Operating Sequence 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.

Lennox 13ACC Series Specifications

General

Brand	Lennox
Model	13ACC Series
Category	Air Handlers
Language	English

Summary

Specifications

Torque Requirements

Electrical Data

Unit Components

Compressor Contactor K1

The compressor is energized by a contactor located in the control box. Single-pole contactors are used in 13ACC series units.

A - Control Box

13ACC units are not equipped with a 24V transformer. All 24 VAC controls are powered by the indoor unit. Refer to wiring diagram.

DANGER

Warning about single-pole contactors and electrical shock hazard. Unit must be grounded.

Dual Capacitor C12

Timed Off Control TOC (option)

Compressor

Condenser Fan Motor

Refrigerant System

Plumbing

Field refrigerant piping consists of liquid and suction lines from the condensing unit to the indoor evaporator coil. Use Lennox L15 series.

DANGER

Warning against backseat valve operation to prevent snap ring explosion and injury.

Charging

Pumping Down System

Procedure for pumping down the system for leak checking or repairs, warning against deep vacuum operation.

Leak Testing

Procedure for leak testing the line set and indoor coil using dry nitrogen, with safety precautions.

Evacuating the System

Charging

Weighing in the Charge

Procedure for weighing refrigerant charge into the unit for fixed orifice or TXV systems based on outdoor temp.

Charging Using the Approach Method

Charging Using the Subcooling Method

Maintenance

Outdoor Unit

Instructions for cleaning and inspecting the outdoor unit, condenser coil, and lines.

Indoor Coil

Instructions for cleaning the indoor coil and checking connecting lines for oil leaks.

Indoor Unit

Instructions for cleaning/changing filters, checking wiring, voltage, and amp-draw on blower motor.

Wiring Diagrams and Sequence of Operation