Lennox 13ACX?042 User Manual

Page 1
©2006 Lennox Industries Inc.
Corp. 0612−L2
13ACX
Service Literature
Revised 06−2007
13ACX SERIES UNITS
The 13ACX is a high efficiency residential split−system con-
densing unit, which features a scroll compressor and de-
signed for R−410A refrigerant. 13ACX units are available in
sizes ranging from 1−1/2 through 5 tons. The series is de-
signed for use with an expansion valve in the indoor unit.
This manual is divided into sections which discuss the major
components, refrigerant system, charging procedure, main-
tenance and operation sequence.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are sub-
ject to change.
IMPORTANT
Operating pressures of this R−410A unit are higher
than pressures in R−22 units. Always use service
equipment rated for R−410A.
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, re-
cycled waste water, urine, fertilizers, or other damag-
ing chemicals).
TABLE OF CONTENTS
General Page 1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications / Electrical Data Page 2. . . . . . . .
I Application Page 3. . . . . . . . . . . . . . . . . . . . . . . .
II Unit Components Page 3. . . . . . . . . . . . . . . . . .
III Refrigeration System Page 6. . . . . . . . . . . . . .
IV Charging Page 7. . . . . . . . . . . . . . . . . . . . . . . .
VI Maintenance Page 13. . . . . . . . . . . . . . . . . . . . .
VII Wiring and Sequence of Operation Page 14.

Lennox 13ACX?042 Specifications

General

Cooling Capacity	3.5 Tons
SEER Rating	13
Refrigerant	R-410A
Sound Level	76 dB
Voltage	208/230V
Phase	1
Weight (Outdoor Unit)	220 lbs
Type	Split System Air Conditioner
Compressor Type	Single Stage

Summary

13ACX SERIES UNITS

IMPORTANT

Highlights crucial operational notes and safety considerations for R-410A units.

WARNING

Details critical safety warnings regarding improper installation, alteration, or service.

SPECIFICATIONS

General Data

Provides basic physical and operational data for the 13ACX series models.

ELECTRICAL DATA

Details electrical requirements, protections, and component ratings for the units.

I - APPLICATION

II - UNIT COMPONENTS

A - Control Box

Details the components and function of the unit's electrical control box.

ELECTROSTATIC DISCHARGE (ESD) Precautions and Procedures

Explains necessary precautions to protect electronic components from ESD damage.

B - Compressor

C - Condenser Fan Motor

D - Loss of Charge Switch (option)

E - High Pressure Switch

III - REFRIGERANT SYSTEM

A - Plumbing

Describes the liquid and suction line connections and service valve access.

IV - CHARGING

A - Leak Testing

Outlines the procedure for checking line set connections and indoor unit for leaks.

B - Evacuating

Details the process of removing noncondensables and moisture from the system.

Check Indoor Airflow before Charging

Pre-Charge Maintenance Checks

Determining Charge Method

Weigh in Charge

Explains how to weigh in the correct amount of refrigerant based on unit and line set.

Superheat RFC Charge

SUPERHEAT METHOD

Provides detailed steps for charging the unit using the superheat method.

Approach TXV Charge

APPROACH METHOD

Details the procedure for charging the unit using the approach method.

Subcooling TXV Charge

SUBCOOLING METHOD

Explains the steps for charging the unit using the subcooling method.

V - MAINTENANCE

Indoor Coil

Instructions for cleaning and inspecting the indoor coil.

Indoor Unit

Steps for maintaining the indoor unit, including filters and blower.

VI - WIRING DIAGRAMS AND SEQUENCE OF OPERATION

COOLING:

Explains the step-by-step process for the unit's cooling operation cycle.

END OF COOLING DEMAND:

Details the sequence when the cooling demand is satisfied and the unit stops.