Lennox 13ACX-018-230-01, 13ACX-018-230-02, 13ACX-018-230-03, 13ACX-018-230-10, 13ACX-018-230-11 Installation And Service Procedure

INSTALLATION AND SERVICE

PROCEDURE

Corp. 0612-L2

Service Literature

LOUVERED

NON-LOUVERED

Revised January 2015

WARNING

Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property.

Installation and service must be performed by a licensed
professional installer (or equivalent) or a service agency.

IMPORTANT

This unit must be matched with an indoor coil as
specified in Lennox Product Specification bulletin. Coils
previously charged with HCFC-22 must be flushed.

WARNING

Electric Shock Hazard. Can cause injury
or death. Unit must be grounded in
accordance with national and local
codes.

Line voltage is present at all components
when unit is not in operation on units with
single‐pole contactors. Disconnect all
remote electric power supplies before
opening access panel. Unit may have
multiple power supplies.

13ACX

TABLE OF CONTENTS

Model Number Identification 2......................

Typical Serial Number Identification 2..............

Specifications 2.................................

Electrical Data 4................................

Unit Dimensions 8.................................

Typical Unit Parts Arrangement 9...................

Operating Gauge Set and Service Valves 9...........

Unit Placement 11.................................

Removing and Installing Louvers 12.................

New or Replacement Line Set 13....................

Brazing Connections 15...........................

Flushing Line Set and Indoor Coil 18................

Installing Indoor Metering Device 19................

Leak Test Line Set and Indoor Coil 20...............

Evacuating Line Set and Indoor Coil 21.............

Electrical Connections 22..........................

System Operation 23..............................

Maintenance 24...................................

Start-Up and Performance Checklist 25..............

Sequence of Operations 26.........................

Servicing Unit Void of Charge 28....................

Unit Start-Up 28..................................

System Refrigerant 28.............................

13ACX Air Conditioners, which will also be referred to in
this instruction as the outdoor unit, uses HFC-410A
refrigerant. This outdoor unit must be installed with a
matching indoor unit and line set as outlined in the Lennox
13ACX Product Specification bulletin.

This outdoor unit is designed for use in systems that use
one of the following refrigerant metering devices:

 Thermal expansion valve (TXV)
 Fixed orifice

IMPORTANT

The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for noncompliance.

Page 1

Model Number Identification

AC X13 024 −

Nominal SEER

Unit Type

AC = Air Conditioner

Refrigerant

X = R-410A

Typical Serial Number Identification

Location Code

19 = Saltillo, Mexico

58 = Marshalltown, IA

Year Code

08 = 2008
09 = 2009
10 = 2010

19 09 C

Specifications

−−

230

Cooling Capacity - Tons
018 = 1.5

024 = 2
030 = 2.5
036 = 3
042 = 3.5
048 = 4
060 = 5

05716

Month Code

A = January
B = February
C = March

17

Minor Revision Number

Voltage

230 = 208/230V-1phase-60hz

5 (or 6) Digit Unique Number

Unit Outdoor Fan

Model Number

13ACX-018-230-01 76 4 lbs. 7 oz. 3 18

13ACX-018-230-02 76 3 lbs. 13 oz. 3 18

13ACX-018-230-03 76 5 lbs. 7 oz. 3 18

13ACX-018-230-10 through -15 76 3 lbs. 13 oz. 3 18

13ACX-018-230-17, -18 76 3 lbs. 15 oz. 3 18

1

Tested according to AHRI Standard 270-2008 test conditions.

2

Refrigerant charge sufficient for 15 feet length of refrigerant lines.

Model Number

13ACX-024-230-01 76 4 lbs. 14 oz. 3 18

13ACX-024-230-02 76 4 lbs. 6 oz. 3 18

13ACX-024-230-03 76 5 lbs. 12 oz. 3 18

13ACX-024-230-10 through -13, -15, -17 76 4 lbs. 6 oz. 3 18

13ACX-024-230-18 76 3 lbs. 15 oz. 3 18

13ACX-024-230-19 76 4 lbs. 6 oz. 3 18

1

Tested according to AHRI Standard 270-2008 test conditions.

2

Refrigerant charge sufficient for 15 feet length of refrigerant lines.

Sound Rating Number

Sound Rating Number

(dB)

(dB)

1

1

Factory Refrigerant

Unit Outdoor Fan

Factory Refrigerant

Charge

Charge

2

2

Number of Blades Diameter - inches.

Number of Blades Diameter - inches.

Page 2

Unit Outdoor Fan

Model Number

Sound Rating Number

(dB)

1

Factory Refrigerant

Charge

2

Number of Blades Diameter - inches.

13ACX-030-230-01 76 6 lbs. 3 oz. 4 18

13ACX-030-230-02 76 4 lbs. 4 oz. 4 18

13ACX-030-230-03 76 5 lbs. 13 oz. 4 18

13ACX-030-230-10 through -13, -15 76 4 lbs. 4 oz. 4 18

13ACX-030-230-17, -18, -19 76 5 lbs. 2 oz. 4 18

1

Tested according to AHRI Standard 270-2008 test conditions.

2

Refrigerant charge sufficient for 15 feet length of refrigerant lines.

Unit Outdoor Fan

Model Number

Sound Rating Number

(dB)

1

Factory Refrigerant

Charge

2

Number of Blades Diameter - inches.

13ACX-036-230-01 76 6 lbs. 7 oz. 4 18

13ACX-036-230-02 through -16 76 5 lbs. 9 oz. 4 18

13ACX-036-230-17, -18 76 5 lbs. 4 oz. 4 18

1

Tested according to AHRI Standard 270-2008 test conditions.

2

Refrigerant charge sufficient for 15 feet length of refrigerant lines.

Unit Outdoor Fan

Model Number

Sound Rating Number

(dB)

1

Factory Refrigerant

Charge

2

Number of Blades Diameter - inches.

13ACX-042-230-01 79 8 lbs. 3 oz. 4 22

13ACX-042-230-03 79 7 lbs. 6 oz. 4 22

13ACX-042-230-10 through -16 79 6 lbs. 6 oz. 4 22

13ACX-042-230-17, -18 79 6 lbs. 8 oz. 4 22

1

Tested according to AHRI Standard 270-2008 test conditions.

2

Refrigerant charge sufficient for 15 feet length of refrigerant lines.

Unit Outdoor Fan

Model Number

Sound Rating Number

(dB)

1

Factory Refrigerant

Charge

2

Number of Blades Diameter - inches.

13ACX-048-230-01 79 8 lbs. 4 oz. 4 22

13ACX-048-230-03 79 8 lbs. 12 oz. 4 22

13ACX-048-230-10 through -16 79 7 lbs. 8 oz. 4 22

13ACX-048-230-17, -18, -19 79 7 lbs. 12 oz. 4 22

1

Tested according to AHRI Standard 270-2008 test conditions.

2

Refrigerant charge sufficient for 15 feet length of refrigerant lines.

Unit Outdoor Fan

Model Number

Sound Rating Number

(dB)

1

Factory Refrigerant

Charge

2

Number of Blades Diameter - inches.

13ACX-060-230-01 79 11 lbs. 2 oz. 4 22

13ACX-060-230-02 79 10 lbs. 0 oz. 4 22

13ACX-060-230-05 79 11 lbs. 6 oz. 4 22

13ACX-060-230-10 through -16 79 10 lbs. 0 oz. 4 22

13ACX-060-230-17, -18 79 9 lbs. 0 oz. 4 22

1

Tested according to AHRI Standard 270-2008 test conditions.

2

Refrigerant charge sufficient for 15 feet length of refrigerant lines.

Page 3

13ACX SERIES

Electrical Data

208/230V-60 Hz-1 Ph

Unit Compressor Condenser Fan

Model Number

13ACX-018-230-01

Label

Rev.

1.0, 2.0 &

3.0

Maximum

Over-

current

Protection

(amps)

1

Minimum

Circuity

Ampacity

20 12.3 9.0 48.0 1/5 1075 1.1 2.0

13ACX-018-230-02 1.0 20 12.0 9.0 48.0 1/10 1075 0.7 1.4

13ACX-018-230-03 1.0 20 13.0 9.0 48.0 1/4 1080 1.7 3.4

13ACX-018-230-10 1.0 20 12.0 9.0 48.0 1/10 1075 0.7 1.4

1.0 20 10.9 8.1 39.0 1/10 1075 0.7 1.4

13ACX-018-230-11

2.0 15 9.8 7.3 39.0 1/10 1075 0.7 1.4

3.0 20 12.0 9.0 39.0 1/10 1075 0.7 1.4

13ACX-018-230-12 1.0 20 12.0 9.0 48.0 1/10 1075 0.7 1.4

13ACX-018-230-13

1.0 15 9.8 7.3 39.0 1/10 1075 0.7 1.4

2.0 20 12.0 9.0 39.0 1/10 1075 0.7 1.4

13ACX-018-230-14 1.0 & 2.0 20 12.0 9.0 39.0 1/10 1075 0.7 1.4

13ACX-018-230-15 1.0 & 2.0 20 12.0 9.0 39.0 1/10 1075 0.7 1.4

13ACX-018-230-17

1.0 15 10.9 8.1 39.0 1/10 1075 0.7 1.4

2.0 20 12.0 9.0 39.0 1/10 1075 0.7 1.4

13ACX-018-230-18 1.0 20 12.0 9.0 48.0 1/10 1075 0.7 1.4

1

HACR type circuit breaker or fuse.

2

Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.

Rated

Load

Amps

2

(RLA)

Locked

Rotor
Amps
(LRA)

Motor HP

Nominal

RPM

Full Load

Amps
(FLA)

Locked

Rotor
Amps
(LRA)

208/230V-60 Hz-1 Ph

Unit Compressor Condenser Fan

Model Number

13ACX-024-230-01

Label

Rev.

1.0, 2.0
and 3.0

Maximum

Over-

current

Protection

(amps)

1

Minimum

Circuity

Ampacity

30 17.9 13.4 58.3 1/5 1075 1.1 2.0

Rated

Load

Amps

2

(RLA)

Locked

Rotor
Amps
(LRA)

Motor HP

Nominal

RPM

Full Load

Amps
(FLA)

Locked

Rotor
Amps
(LRA)

13ACX-024-230-02 1.0 30 17.5 13.4 58.3 1/10 1075 0.7 1.4

13ACX-024-230-03 1.0 30 18.5 13.4 58.3 1/4 1080 1.7 3.4

13ACX-024-230-10 1.0 30 17.5 13.4 58.3 1/10 1075 0.7 1.4

1.0 30 17.5 13.4 53.3 1/10 1075 0.7 1.4

13ACX-024-230-11

2.0 20 14.1 10.7 53.0 1/10 1075 0.7 1.4

3.0 20 13.1 9.9 53.0 1/10 1075 0.7 1.4

4.0 30 17.5 13.4 53.3 1/10 1075 0.7 1.4

13ACX-024-230-12

13ACX-024-230-13

1.0 30 17.5 13.4 58.3 1/10 1075 0.7 1.4

2.0 30 17.5 13.46 58.3 1/10 1075 0.7 1.4

1.0 20 13.1 9.9 53.0 1/10 1075 0.7 1.4

2.0 30 17.5 13.4 53.0 1/10 1075 0.7 1.4

13ACX-024-230-15 1.0 & 2.0 30 17.5 13.4 53.0 1/10 1075 0.7 1.4

13ACX-024-230-17

1.0 20 14.1 10.7 53.0 1/10 1075 0.7 1.4

2.0 30 17.5 13.46 53.0 1/10 1075 0.7 1.4

13ACX-024-230-18 1.0 30 17.6 13.5 58.3 1/10 1075 0.7 1.4

13ACX-024-230-19 1.0 30 17.5 13.46 58.0 1/10 1075 0.7 1.4

1

HACR type circuit breaker or fuse.

2

Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.

Page 4

208/230V-60 Hz-1 Ph

Unit Compressor Condenser Fan

Model Number

13ACX-030-230-01

Label

Rev.

1.0, 2.0 &

3.0

Maximum

Over-

current

Protection

(amps)

1

Minimum

Circuity

Ampacity

30 18.7 14.1 73.0 1/5 1075 1.1 2.0

Rated

Load

Amps

2

(RLA)

Locked

Rotor
Amps
(LRA)

Motor HP

Nominal

RPM

Full Load

Amps
(FLA)

Locked

Rotor
Amps
(LRA)

13ACX-030-230-02 1.0 30 18.7 14.1 73.0 1/5 1075 1.1 2.0

13ACX-030-230-03 1.0 30 19.3 14.1 73.0 1/4 1080 1.7 3.4

13ACX-030-230-10 1.0 30 18.7 14.1 73.0 1/5 1075 1.1 2.0

1.0 30 29.3 12.9 59.0 1/5 1075 1.1 2.0

13ACX-030-230-11

2.0 30 15.6 11.6 59.0 1/5 1075 1.1 2.0

3.0 25 16.3 12.2 59.0 1/5 1075 1.1 2.0

4.0 30 18.7 14.1 59.0 1/5 1075 1.1 2.0

13ACX-030-230-12 1.0 30 18.7 14.1 73.0 1/5 1075 1.1 2.0

13ACX-030-230-13

1.0 25 16.3 12.2 59.0 1/5 1075 1.1 2.0

2.0 30 18.7 14.1 59.0 1/5 1075 1.1 2.0

13ACX-030-230-15 1.0 & 2.0 30 18.7 14.1 59.0 1/5 1075 1.1 2.0

13ACX-030-230-17

1.0 25 15.6 11.6 59.0 1/5 1075 1.1 2.0

2.0 30 18.7 14.1 59.0 1/5 1075 1.1 2.0

13ACX-030-230-18 1.0 30 18.7 14.1 73.0 1/5 1075 1.1 2.0

13ACX-030-230-19

1

HACR type circuit breaker or fuse.

2

Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.

1.0 25 17.1 12.8 64.0 1/5 1075 1.1 2.0

2.0 30 18.7 14.1 64.0 1/5 1075 1.1 2.0

208/230V-60 Hz-1 Ph

Unit Compressor Condenser Fan

Model Number

13ACX-036-230-01

Label

Rev.

1.0, 2.0 &

3.0

Maximum

Over-

current

Protection

(amps)

1

Minimum

Circuity

Ampacity

35 21.9 16.6 79.0 1/5 1075 1.1 2.0

Rated

Load

Amps

2

(RLA)

Locked

Rotor
Amps
(LRA)

Motor HP

Nominal

RPM

Full Load

Amps
(FLA)

Locked

Rotor
Amps
(LRA)

13ACX-036-230-02 1.0 35 21.9 16.6 79.0 1/5 1075 1.1 2.0

13ACX-036-230-04 1.0 35 22.5 16.6 79.0 1/5 1075 1.7 2.0

13ACX-036-230-10 1.0 35 21.9 16.6 79.0 1/5 1075 1.1 2.0

1.0 35 21.9 16.6 70.0 1/5 1075 1.1 2.0

13ACX-036-230-11

2.0 35 20.2 15.3 70.0 1/5 1075 1.1 2.0

3.0 35 21.9 16.6 70.0 1/5 1075 1.1 2.0

13ACX-036-230-12

1.0 35 21.8 16.7 79.0 1/5 1075 1.1 2.0

2.0 35 22.0 16.7 79.0 1/5 1075 1.1 2.0

13ACX-036-230-13 1.0 35 21.9 16.6 70.0 1/5 1075 1.1 2.0

13ACX-036-230-14 1.0 35 21.9 16.6 70.0 1/5 1075 1.1 2.0

13ACX-036-230-15 1.0 & 2.0 35 21.9 16.6 70.0 1/5 1075 1.1 2.0

13ACX-036-230-16 1.0 35 21.8 16.7 79.0 1/5 1075 1.1 2.0

13ACX-036-230-17

13ACX-036-230-18

1

HACR type circuit breaker or fuse.

2

Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.

1.0 35 20.1 15.2 70.0 1/5 1075 1.1 2.0

2.0 35 22.0 16.7 70.0 1/5 1075 1.1 2.0

1.0 35 21.9 16.7 79.0 1/5 1075 1.1 2.0

2.0 35 22.0 16.7 79.0 1/5 1075 1.1 2.0

Page 5

13ACX SERIES

208/230V-60 Hz-1 Ph

Unit Compressor Condenser Fan

Model Number

13ACX-042-230-01

Label

Rev.

1.0, 2.0 &

3.0

Maximum

Over-

current

Protection

(amps)

1

Minimum

Circuity

Ampacity

40 24.1 17.9 112.0 1/3 1075 1.7 4.1

Rated

Load

Amps

2

(RLA)

Locked

Rotor
Amps
(LRA)

Motor HP

Nominal

RPM

Full Load

Amps
(FLA)

Locked

Rotor
Amps
(LRA)

13ACX-042-230-03 1.0 40 25.2 17.9 112.0 1/2 1075 2.8 No Data

13ACX-042-230-10

13ACX-042-230-11

1.0 40 24.1 17.9 112.0 1/4 825 1.7 3.1

2.0 40 25.3 18.8 112.0 1/4 825 1.7 3.1

1.0 50 28.1 21.1 90.0 1/4 825 1.7 3.1

2.0 40 25.3 18.8 90.0 1/4 825 1.7 3.1

1.0 40 24.1 17.9 112.0 1/4 825 1.7 3.1

13ACX-042-230-12

2.0 40 25.3 18.8 112.0 1/4 825 1.7 3.1

3.0 45 28.1 21.2 112.0 1/4 825 1.7 3.1

13ACX-042-230-13 1.0 40 25.3 18.8 90.0 1/4 825 1.7 3.1

13ACX-042-230-14 1.0 40 25.3 18.8 90.0 1/4 825 1.7 3.1

13ACX-042-230-15 1.0 & 2.0 40 25.3 18.8 90.0 1/4 825 1.7 3.1

13ACX-042-230-16 1.0 40 25.3 18.8 112.0 1/4 825 1.7 3.1

13ACX-042-230-17 1.0 & 2.0 45 28.1 21.2 90.0 1/4 825 1.7 3.1

13ACX-042-230-18

1

HACR type circuit breaker or fuse.

2

Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.

1.0 40 24.1 18.0 112.0 1/4 825 1.7 3.1

2.0 & 3.0 45 28.1 21.2 112.0 1/4 825 1.7 3.1

208/230V-60 Hz-1 Ph

Unit Compressor Condenser Fan

Model Number

13ACX-048-230-01

Label

Rev.

1.0, 2.0 &

3.0

Maximum

Over-

current

Protection

(amps)

1

Minimum

Circuity

Ampacity

50 28.9 21.8 117.0 1/4 825 1.7 3.1

Rated

Load

Amps

2

(RLA)

Locked

Rotor
Amps
(LRA)

Motor HP

Nominal

RPM

Full Load

Amps
(FLA)

Locked

Rotor
Amps
(LRA)

13ACX-048-230-10 1.0 50 28.9 21.8 117.0 1/4 825 1.7 3.1

1.0 50 28.9 21.8 117.0 1/4 825 1.7 3.1

13ACX-048-230-11

2.0 45 27.7 20.8 100.0 1/4 825 1.7 3.1

3.0 50 28.9 21.8 100.0 1/4 825 1.7 3.1

13ACX-048-230-12

1.0 50 28.9 21.8 117.0 1/4 825 1.7 3.1

2.0 50 31.9 24.2 117.0 1/4 825 1.7 3.1

13ACX-048-230-13 1.0 50 28.9 21.8 100.0 1/4 825 1.7 3.1

13ACX-048-230-14 1.0 50 28.9 21.8 100.0 1/4 825 1.7 3.1

13ACX-048-230-15 1.0 & 2.0 50 28.9 21.8 100.0 1/4 825 1.7 3.1

13ACX-048-230-16 1.0 50 28.9 21.8 117.0 1/4 825 1.7 3.1

13ACX-048-230-17

1.0 50 31.9 24.1 100.0 1/4 825 1.7 3.1

2.0 50 31.9 24.2 100.0 1/4 825 1.7 3.1

13ACX-048-230-18 1.0 50 28.9 21.8 117.0 1/4 825 1.7 3.1

13ACX-048-230-19 1.0 50 31.9 24.2 100.0 1/4 825 1.7 3.1

1

HACR type circuit breaker or fuse.

2

Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.

Page 6

208/230V-60 Hz-1 Ph

Unit Compressor Condenser Fan

Model Number

Label

Rev.

Maximum

Over-

current

Protection

(amps)

1

Minimum

Circuity

Ampacity

Rated

Load

Amps

2

(RLA)

Locked

Rotor
Amps
(LRA)

Motor HP

Nominal

RPM

Full Load

Amps
(FLA)

Locked

Rotor
Amps
(LRA)

13ACX-060-230-01 1.0 & 2.0 60 34.5 26.2 134.0 1/4 825 1.7 3.1

13ACX-060-230-02 1.0 & 2.0 60 34.5 26.2 134.0 1/4 825 1.7 3.1

13ACX-060-230-05 1.0 60 35.6 26.2 134.0 1/2 1075 2.8 No Data

13ACX-060-230-10 1.0 60 34.5 26.2 134.0 1/4 825 1.7 3.1

1.0 60 34.5 26.2 134.0 1/4 825 1.7 3.1

13ACX-060-230-11

2.0 50 33.0 25.1 120.0 1/4 825 1.7 3.1

3.0 60 34.6 26.3 120.0 1/4 825 1.7 3.1

13ACX-060-230-12 1.0 60 34.6 26.3 134.0 1/4 825 1.7 3.1

13ACX-060-230-13

1.0 50 33.1 25.1 120.0 1/4 825 1.7 3.1

2.0 60 34.6 26.3 120.0 1/4 825 1.7 3.1

13ACX-060-230-14 1.0 60 34.6 26.3 120.0 1/4 825 1.7 3.1

13ACX-060-230-15 1.0 & 2.0 60 34.6 26.3 120.0 1/4 825 1.7 3.1

13ACX-060-230-16 1.0 60 34.6 26.3 134.0 1/4 825 1.7 3.1

13ACX-060-230-17

1.0 50 29.4 22.1 125.0 1/4 825 1.7 3.1

2.0 60 34.6 26.3 125.0 1/4 825 1.7 3.1

13ACX-060-230-18 1.0 60 34.7 26.4 134.0 1/4 825 1.7 3.1

1

HACR type circuit breaker or fuse.

2

Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.

Page 7

13ACX SERIES

Unit Dimensions - Inches (mm)

A

OUTDOOR

COIL FAN

COMPRESSOR

A

DISCHARGE AIR

B

SUCTION AND LIQUID

LINE CONNECTION

OPTIONAL UNIT STANDOFF KIT (4)

SIDE VIEW

Model Numbers A B

13ACX-018-230-01 24-1/4 (616) 29-1/4 (743)

13ACX-018-230-02 and later 24-1/4 (616) 25-1/4 (641)

13ACX-024-230-01 24-1/4 (616) 33-1/4 (845)

13ACX-024-230-02 and later 24-1/4 (616) 25-1/4 (641)

13ACX-030-230-XX (All) 24-1/4 (616) 29-1/4 (743)

13ACX-036-230-XX (All) 24-1/4 (616) 29-1/4 (743)

13ACX-042-230-01 28-1/4 (718) 33-1/4 (845)

13ACX-042-230-02 and later 28-1/4 (718) 29-1/4 (743)

13ACX-048-230-01 28-1/4 (718) 29-1/4 (743)

13ACX-048-230-02 through -16 28-1/4 (718) 37-1/4 (946)

13ACX-048-230-17 28-1/4 (718) 33-1/4 (845)

13ACX-060-230-01 28-1/4 (718) 43-1/4 (1099)

13ACX-060-230-02 28-1/4 (718) 37-1/4 (946)

13ACX-060-230-03 through -16 28-1/4 (718) 33-1/4 (845)

13ACX-060-230-17 28-1/4 (718) 29-1/4 (743)

(FIELD INSTALLED)

SIDE VIEW

WARNING

This product and/or the indoor unit it is matched with may
contain fiberglass wool.

Disturbing the insulation during installation,
maintenance, or repair will expose you to fiberglass wool
dust. Breathing this may cause lung cancer. (Fiberglass
wool is known to the State of California to cause cancer.)

Fiberglass wool may also cause respiratory, skin, and
eye irritation.

To reduce exposure to this substance or for further
information, consult material safety data sheets
available from address shown below, or contact your
supervisor.

Lennox Industries Inc.
P.O. Box 799900
Dallas, TX 75379-9900

CAUTION

Physical contact with metal edges and corners while
applying excessive force or rapid motion can result in
personal injury. Be aware of, and use caution when
working near these areas during installation or while
servicing this equipment.

Page 8

Typical Unit Parts Arrangement

CONTROL

GROUND LUG

CONTACTOR

CUTOUT FOR HIGH
VOLTAGE CONDUIT

CAPACITOR

CONTROL WIRE
LOOP

NOTE — PLUMBING LAYOUT AND COMPRESSOR TYPE MAY VARY SLIGHTLY
BETWEEN MODEL SIZES.

COMPRESS0R

DISCHARGE LINE

COMPRESSOR

HARNESS

OUTDOOR COIL

LIQUID LINE SERVICE VALVE

Operating Gauge Set and Service Valves

These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.

IMPORTANT

Only use Allen wrenches of sufficient hardness (50Rc ­Rockwell Harness Scale minimum). Fully insert the
wrench into the valve stem recess.

Service valve stems are factory-torqued (from 9 ft-lbs for
small valves, to 25 ft-lbs for large valves) to prevent
refrigerant loss during shipping and handling. Using an
Allen wrench rated at less than 50Rc risks rounding or
breaking off the wrench, or stripping the valve stem
recess.

See the Lennox Service and Application Notes #C-08-1
for further details and information.

TORQUE REQUIREMENTS

When servicing or repairing heating, ventilating, and air
conditioning components, ensure the fasteners are
appropriately tightened. Table 1 lists torque values for
fasteners.

HIGH PRESSURE

SWITCH (S4)

SUCTION LINE SERVICE
VALVE (BALL OR ANGLE­TYPE)

IMPORTANT

To prevent stripping of the various caps used, the
appropriately sized wrench should be used and fitted
snugly over the cap before tightening.

When servicing or repairing HVAC components, ensure
the fasteners are appropriately tightened. Table 1 provides
torque values for fasteners.

Table 1. Torque Requirements

Parts Recommended Torque

Service valve cap 8 ft.- lb. 11 NM

Sheet metal screws 16 in.- lb. 2 NM

Machine screws #10 28 in.- lb. 3 NM

Compressor bolts 90 in.- lb. 10 NM

Gauge port seal cap 8 ft.- lb. 11 NM

USING MANIFOLD GAUGE SET

When checking the system charge, only use a manifold
gauge set that features low loss anti-blow back fittings.
Manifold gauge set used with HFC-410A refrigerant
systems must be capable of handling the higher system
operating pressures. The gauges should be rated for use
with pressures of 0 - 800 psig on the high side and a low
side of 30” vacuum to 250 psig with dampened speed to

Page 9

13ACX SERIES

500 psi. Gauge hoses must be rated for use at up to 800
psig of pressure with a 4000 psig burst rating.

OPERATING SERVICE VALVES

The liquid and vapor line service valves are used for

removing refrigerant, flushing, leak testing, evacuating,
checking charge and charging.

Each valve is equipped with a service port which has a
factory-installed valve stem. Figure 1 provides information
on how to access and operating both angle and ball service
valves.

SERVICE VALVES

ANGLE AND BALL

Operating Angle Type Service Valve:

1. Remove stem cap with an appropriately sized wrench.

2. Use a service wrench with a hex-head extension (3/16” for liquid line valve sizes and 5/16” for vapor line valve sizes) to back
the stem out counterclockwise as far as it will go.

SERVICE PORT CAP

SERVICE PORT CORE

(VALVE STEM SHOWN

TO INDOOR

UNIT

SERVICE PORT

CORE

TO OUTDOOR UNIT

When service valve is OPEN, the service port is
open to linE set, indoor and outdoor unit.

ANGLE-TYPE SERVICE VALVE

(BACK-SEATED OPENED)

(VALVE STEM SHOWN OPEN)
INSERT HEX WRENCH HERE

Operating Ball Type Service Valve:

1. Remove stem cap with an appropriately sized wrench.

2. Use an appropriately sized wrenched to open. To open valve,
roate stem counterclockwise 90°. To close rotate stem clockwise
90°.

TO INDOOR UNIT

STEM CAP

ANGLE-TYPE SERVICE VALVE

(FRONT-SEATED CLOSED)

WHEN SERVICE VALVE IS CLOSED, THE SERVICE PORT IS OPEN
TO

THE LINE SET AND INDOOR UNIT.

To Access Service Port:

A service port cap protects the service port core from contamination and
serves as the primary leak seal.

1. Remove service port cap with an appropriately sized wrench.

2. Connect gauge set to service port.

3. When testing is completed, replace service port cap and tighten as
follows:

CLOSED) INSERT HEX
WRENCH HERE

 With torque wrench: Finger tighten and

torque cap per table 1.

TO OPEN ROTATE STEM
COUNTERCLOCKWISE 90°.

TO CLOSE ROTATE STEM
CLOCKWISE 90°.

SERVICE PORT

SERVICE PORT

SERVICE PORT

CORE

CAP

TO OUTDOOR

UNIT

BALL (SHOWN
CLOSED)

VALV E
STEM

STEM CAP

 Without torque wrench: Finger tighten and

use an appropriately sized wrench to turn
an additional 1/6 turn clockwise.

Reinstall Stem Cap:

Stem cap protects the valve stem from damage and serves as the
primary seal. Replace the stem cap and tighten as follows:

 With Torque Wrench: Finger tighten and

then torque cap per table 1.

 Without Torque Wrench: Finger tight

en and use an appropriately sized
wrench to turn an additional 1/12 turn
clockwise.

9

10

9

10

8

1/6 TURN

12

1

11

8

7

11

6

1/12 TURN

12

2

3

4

5

1

2

3

4

5

7

6

NOTE — A label with specific torque requirements may be affixed to the stem cap. If the label is present, use the specified torque.

Figure 1. Angle and Ball Service Valves

Page 10

See

NOTES

See NOTES

See NOTES

NOTES:

Service clearance of 30 in. (762 mm) must be maintained on one
of the sides adjacent to the control box.

Clearance to one of the other three sides must be 36 in. (914 mm)

See

NOTES

CONTROL

BOX

Clearance to one of the remaining two sides may be 12 in. (305
mm) and the final side may be 6 in. (152 mm).

A clearance of 24 in. must be maintained between two units.

48 in. (1219 mm) clearance required on top of unit.

Figure 2. Installation Clearances

DETAIL A

INSTALL UNIT AWAY

FROM WINDOWS

TWO 90 ELBOWS INSTALLED IN LINE SET

WILL REDUCE LINE SET VIBRATION

Figure 3. Placement, and Slab Mounting

Unit Placement

See Unit Dimensions on page 8 for sizing mounting slab,
platforms or supports. Refer to figure 2 for mandatory
installation clearance requirements.

CAUTION

In order to avoid injury, take proper precaution when
lifting heavy objects.

POSITIONING CONSIDERATIONS

Consider the following when positioning the unit:

DETAIL B

Install unit level or, if on a slope, maintain slope tolerance of 2 degrees
(or 2 inches per 5 feet [50 mm per 1.5 m]) away from building structure.

BUILDING

STRUCTURE

 Some localities are adopting sound ordinances based

on the unit's sound level registered from the adjacent
property, not from the installation property. Install the
unit as far as possible from the property line.

 When possible, do not install the unit directly outside

a window. Glass has a very high level of sound
transmission. For proper placement of unit in relation
to a window see the provided illustration in figure 3,
Detail A.

DISCHARGE AIR

MOUNTING
SLAB

GROUND LEVEL

Page 11

13ACX SERIES

PLACING UNIT ON SLAB

When installing unit at grade level, the top of the slab
should be high enough above grade so that water from
higher ground will not collect around the unit. The slab
should have a slope tolerance as described in figure 3,
Detail B.

ROOF MOUNTING

Install the unit a minimum of 6 inches (152 mm) above the
roof surface to avoid ice build-up around the unit. Locate
the unit above a load bearing wall or area of the roof that
can adequately support the unit. Consult local codes for
rooftop applications.

If unit coil cannot be mounted away from prevailing winter
winds, a wind barrier should be constructed. Size barrier at

Removing and Installing Louvers

WARNING

To prevent personal injury, or damage to panels, unit or structure, be sure to observe the following:

While installing or servicing this unit, carefully stow all removed panels out of the way, so that the panels will not cause injury to personnel,
nor cause damage to objects or structures nearby, nor will the panels be subjected to damage (e.g., being bent or scratched).

While handling or stowing the panels, consider any weather conditions, especially windy conditions, that may cause panels to be blown
around and battered.

least the same height and width as outdoor unit. Mount
barrier 24 inches (610 mm) from the sides of the unit in the
direction of prevailing winds.

NOTICE

Roof Damage!
This system contains both refrigerant and oil. Some

rubber roofing material may absorb oil and cause the
rubber to swell when it comes into contact with oil. The
rubber will then bubble and could cause leaks. Protect
the roof surface to avoid exposure to refrigerant and oil
during service and installation. Failure to follow this
notice could result in damage to roof surface.

When removing the unit panels. Remove panel A first, then B, C and
finally D. When reinstalling panels, reverse that order starting with panel

D, C, B and finally A.

REMOVAL

STEP 1

TO REMOVE PANEL,
REMOVE MOUNTING
SCREWS SECURING
PANEL TO THE UNIT.

PANEL A

STEP 2

SLIGHTLY LIFT PANEL A IN
ORDER TO CLEAR SIDE
LIPS OF PANEL FROM
BASE OF UNIT.

STEP 3

TILT PANEL OUT SLIGHTLY
AND PULL DOWNWARD
TO REMOVE.

REPEAT STEPS 1, 2 AND
3 TO REMOVE PANELS B,
C AND FINALLY D.

PANEL A

PANEL B

WARNING

PANEL A

INSTALLATION

STEP 1

STARTING WITH PANEL D,
INSERT PANEL UNDER UNIT
TOP CAP LIP AND LIFT
SLIGHTLY TO CLEAR SIDE LIP
OF PANEL FROM BASE.

STEP 2

MOVE PANEL IN TOWARDS UNIT.
ALIGN LEFT/RIGHT SIDE LIPS OF
PANEL WITH GROOVE INSERTS
ALONG LEFT/RIGHT SIDE OF UNIT.

SIDE

GROOVE

STEP 3

SECURE PANEL, WITH
MOUNTING SCREWS.

REPEAT STEPS 1 AND 2 TO
INSTALL PANELS C, B AND
FINALLY A.

PANEL C

PANEL D

TOP CAP

BASE

PANEL D

Figure 4. Louvers

Page 12