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

New or Replacement Line Set

Table 2. Refrigerant Line Set

Model Number (-xx*)

13ACX-018-230-17
13ACX-024-230-17

13ACX-018-230-XX
13ACX-024-230-XX
13ACX-030-230-XX

13ACX-036-230-17
13ACX-042-230-17

13ACX-036-230-XX

13ACX-042-230-XX
13ACX-048-230-XX
13ACX-060-230-17

13ACX-060-230-XX 3/8” (10 mm) 1-1/8” (29 mm) ** Field-fabricated N/A N/A

* Applicable to all minor revision numbers unless otherwise specified.
** Some applications may required a field-provided 1-1/8” to 7/8” adapter.

Liquid Line Suction Line L15 Line Set Model Line Set Length Catalog Number

3/8” (10 mm) 5/8“ (16 mm)

3/8” (10 mm) 3/4” (19 mm)

3/8” (10 mm) 7/8” (22 mm)

This section provides information on new installation or
replacement of existing line set. If a new or replacement
line set is not required, then proceed to Brazing
Connections on page 15.

Valve Size Connections Recommended Line Sets

L15-26-20 20 feet (6.1 m) 89J52

L15-26-25 25 feet (9.1 m) 89J53

L15-26-35 35 feet (12.2 m) 89J54

L15-26-50 50 feet (15.2 m) 89J55

L15-41-20 20 feet (6.1 m) 89J56

L15-41-30 30 feet (9.1 m) 89J57

L15-41-40 40 feet (12.2 m) 89J58

L15-41-50 50 feet (15.2 m) 89J59

L15-65-30 30 feet (9.1 m) 89J60

L15-65-40 40 feet (12.2 m) 89J61

L15-65-50 50 feet (15.2 m) 89J62

The compressor is charged with sufficient Polyol ester oil
for line set lengths up to 50 feet. Recommend adding oil to
system based on the amount of refrigerant charge in the
system. No need to add oil in system with 20 pounds of
refrigerant or less. For systems over 20 pounds - add one

NOTE - When installing refrigerant lines longer than 50
feet, see the Lennox Refrigerant Piping Design and
Fabrication Guidelines, CORP. 9351-L9, or contact
Lennox Technical Support Product Applications for
assistance.

If refrigerant lines are routed through a wall, seal and
isolate the opening so vibration is not transmitted to the
building. Pay close attention to line set isolation during
installation of any HVAC system. When properly isolated
from building structures (walls, ceilings. floors), the
refrigerant lines will not create unnecessary vibration and
subsequent sounds.

Also, consider the following when placing and installing a
high-efficiency air conditioner:

Field refrigerant piping consists of liquid and suction lines
from the outdoor unit (braze connections) to the indoor unit
coil (flare or braze connections). Use Lennox L15 (braze,
non-flare) series line set, or use field-fabricated refrigerant
lines as listed in Table 2.

ounce of every five pounds of refrigerant.
Recommended topping-off POE oils are Mobil EAL

ARCTIC 22 CC or ICI EMKARATE RL32CF.
To obtain the correct information from Lennox, be sure to

communicate the following points:

 Model (13ACX) and size of unit (e.g. -060).
 Line set diameters for the unit being installed as listed

in table 2 and total length of installation.

 Number of elbows and if there is a rise or drop of the

piping.

MATCHING WITH NEW OR EXISTING INDOOR COIL
AND LINE SET

The RFC1-metering line consisted of a small bore copper
line that ran from condenser to evaporator coil. Refrigerant
was metered into the evaporator by utilizing
temperature/pressure evaporation effects on refrigerant in
the small RFC line. The length and bore of the RFC line
corresponded to the size of cooling unit.

If the 13ACX is being used with either a new or existing
indoor coil which is equipped with a liquid line which served

IMPORTANT

Mineral oils are not compatible with HFC-410A. If oil

must be added, it must be a Polyol ester oil.

as a metering device (RFCI), the liquid line must be
replaced prior to the installation of the 13ACX unit.
Typically a liquid line used to meter flow is 1/4” in diameter
and copper.

Page 13

13ACX SERIES

Line Set Isolation — The following illustrations are examples of proper refrigerant line set isolation:

REFRIGERANT LINE SET — TRANSITION

FROM VERTICAL TO HORIZONTAL

ANCHORED HEAVY NYLON
WIRE TIE OR AUTOMOTIVE

MUFFLER‐TYPE HANGER

WALL
STUD

NON-CORROSIVE

METAL SLEEVE

AUTOMOTIVE

MUFFLER‐TYPE HANGER

STRAP LIQUID LINE TO
VAPOR LINE

LIQUID LINE

VAPOR LINE - WRAPPED
IN ARMAFLEX

REFRIGERANT LINE SET — INSTALLING

HORIZONTAL RUNS

To hang line set from joist or rafter, use either metal strapping material
or anchored heavy nylon wire ties.

WIRE TIE (AROUND
VAPOR LINE ONLY)

8 FEET (2.43 METERS)

STRAPPING

MATERIAL (AROUND

VAPOR LINE ONLY)

TAPE OR
WIRE TIE

FLOOR JOIST OR

ROOF RAFTER

8 FEET (2.43 METERS)

NON-CORROSIVE
METAL SLEEVE

STRAP THE VAPOR LINE TO THE JOIST
OR RAFTER AT 8 FEET (2.43 METERS)
INTERVALS THEN STRAP THE LIQUID
LINE TO THE VAPOR LINE.

TAPE OR
WIRE TIE

REFRIGERANT LINE SET — INSTALLING

VERTICAL RUNS (NEW CONSTRUCTION SHOWN)

NOTE — Insulate liquid line when it is routed through areas where the
surrounding ambient temperature could become higher than the
temperature of the liquid line or when pressure drop is equal to or greater
than 20 psig.

OUTSIDE WALL

WOOD BLOCK

BETWEEN STUDS

VAPOR LINE WRAPPED

WITH ARMAFLEX

OUTSIDE

WALL

PVC

PIPE

FIBERGLASS

INSULATION

VAPOR LINE

SLEEVE

CAULK

LIQUID
LINE

NOTE — Similar installation practices should be used if line set is
to be installed on exterior of outside wall.

LIQUID LINE

WIRE TIE

INSIDE WALL

STRAP

NON-CORROSIVE
METAL SLEEVE

WIRE TIE

WOOD BLOCK

WIRE TIE

STRAP

FLOOR JOIST OR

ROOF RAFTER

Figure 5. Line Set Installation

Page 14

LIQUID LINE FILTER DRIER INSTALLATION

The filter drier (one is shipped with each 13ACX unit) must
be field installed in the liquid line between the outdoor unit's
liquid line service valve and the indoor coil's metering
device (fixed orifice or TXV) as illustrated in figure 6. This
filter drier must be installed to ensure a clean,
moisture-free system. Failure to install the filter drier will
void the warranty. A replacement filter drier is available
from Lennox. See Brazing Connections on page 15 for
special procedures on brazing filter drier connections to
the liquid line.

BRAZE CONNECTION POINTS

LIQUID

LINE

OUTDOOR

UNIT

LIQUID LINE

SERVICE VALVE

LINE

LIQUID LINE

FILTER DRIER

WARNING

When using a high pressure gas such as
dry nitrogen to pressurize a refrigeration
or air conditioning system, use a
regulator that can control the pressure
down to 1 or 2 psig (6.9 to 13.8 kPa).

CAUTION

Brazing alloys and flux contain materials which are
hazardous to your health.

Avoid breathing vapors or fumes from brazing
operations. Perform operations only in well-ventilated
areas.

Wear gloves and protective goggles or face shield to
protect against burns.

Wash hands with soap and water after handling brazing
alloys and flux.

Figure 6. Typical Liquid Line Filter Drier

Installation

IMPORTANT

If this unit is being matched with an approved line set
or indoor unit coil which was previously charged with
mineral oil, or if it is being matched with a coil which
was manufactured before January of 1999, the coil
and line set must be flushed prior to installation. Take
care to empty all existing traps. Polyol ester (POE) oils
are used in Lennox units charged with HFC-410A
refrigerant. Residual mineral oil can act as an
insulator, preventing proper heat transfer. It can also
clog the expansion device, and reduce the system
performance and capacity.
Failure to properly flush the system per the
instructions below will void the warranty.

Brazing Connections

Use the procedures outline in figures 7 and 8 for brazing
line set connections to service valves.

WARNING

Danger of fire. Bleeding the refrigerant
charge from only the high side may result
in pressurization of the low side shell and
suction tubing. Application of a brazing
torch to a pressurized system may result
in ignition of the refrigerant and oil
mixture - Check the high and low
pressures before applying heat.

IMPORTANT

Connect gauge set low pressure side to vapor line
service valve and repeat procedure starting at
paragraph 4 for brazing the liquid line to service port
valve.

IMPORTANT

Allow braze joint to cool before removing the wet rag
from the service valve. Temperatures above 250ºF can
damage valve seals.

IMPORTANT

Use silver alloy brazing rods with 5% minimum silver
alloy for copper-to-copper brazing. Use 45% minimum
alloy for copper-to-brass and copper-to-steel brazing.

WARNING

Fire, Explosion and Personal Safety
Hazard.

Failure to follow this warning could
result in damage, personal injury or
death.

Never use oxygen to pressurize or
purge refrigeration lines. Oxygen,
when exposed to a spark or open
flame, can cause fire and/or an ex
plosion, that could result in property
damage, personal injury or death.

Page 15

13ACX SERIES

CUT AND DEBUR

Cut ends of the refrigerant lines square (free from nicks or dents)

1

and debur the ends. The pipe must remain round. Do not crimp end
of the line.

CUT AND DEBUR

LINE SET SIZE MATCHES

SERVICE VALVE CONNECTION

SERVICE VALVE

COPPER TUBE

REDUCER

CONNECTION

STUB

CAP AND CORE REMOVAL

Remove service cap and core from

2

both the suction / vapor and liquid line
service ports.

SERVICE PORT

CAP

SERVICE

PORT

CORE

LIQUID LINE SERVICE

VALV E

SERVICE

PORT

CORE

SERVICE
PORT CAP

SUCTION / VAPOR LINE

SERVICE VALVE

LINE SET SIZE IS SMALLER

THAN CONNECTION

REFRIGERANT LINE

DO NOT CRIMP SERVICE VALVE

CONNECTOR WHEN PIPE IS

SMALLER THAN CONNECTION

ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION / VAPOR LINE SERVICE
VALVES

3

Flow regulated nitrogen (at 1 to 2 psig) through the low-side refrigeration gauge set into the liquid line service port valve, and out of the suction /
vapor line service port valve.

A Connect gauge set low pressure side to

liquid line service valve (service port).

B Connect gauge set center port to bottle of

nitrogen with regulator.

C Remove core from valve in suction / vapor

line service port to allow nitrogen to escape.

SUCTION / VAPOR SERVICE PORT MUST BE

OPEN TO ALLOW EXIT POINT FOR NITROGEN

VAPOR LINE

INDOOR

UNIT

LIQUID LINE

ATTACH

GAUGES

C

LIQUID LINE SERVICE

SUCTION /

VAPOR LINE

SERVICE

VALV E

VALV E

HIGHLOW

B

OUTDOOR

UNIT

WHEN BRAZING LINE SET TO

A

SERVICE VALVES, POINT FLAME

AWAY FROM SERVICE VALVE.

USE REGULATOR TO FLOW

NITROGEN AT 1 TO 2 PSIG.

NITROGEN

Figure 7. Brazing Procedures

Page 16

WRAP SERVICE VALVES

To help protect service valve seals during brazing, wrap water saturated cloths around service valve bodies and copper tube stubs. Use

4

additional water saturated cloths underneath the valve body to protect the base paint.

FLOW NITROGEN

Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and

5

out of the suction / vapor valve stem port. See steps 3A, 3B and 3C on manifold gauge set connections

BRAZE LINE SET

Wrap both service valves with water saturated cloths as illustrated here and as mentioned in step 4, before brazing to line set. Water

6

saturated cloths must remain water saturated throughout the brazing and cool-down process.

LIQUID LINE SERVICE VALVE

WHEN BRAZING LINE SET TO

SERVICE VALVES, POINT FLAME

AWAY FROM SERVICE VALVE.

IMPORTANT — Allow braze joint to cool. Apply

additional water saturated cloths to help cool brazed
joint. Do not remove water saturated cloths until piping
has cooled. Temperatures above 250ºF will damage
valve seals.

LIQUID LINE

WATER SATURATED
CLOTH

WARNING

1. FIRE, PERSONAL INJURY, OR PROPERTY
DAMAGE may result if you do not wrap a water

saturated cloth around both liquid and suction line
service valve bodies and copper tube stub while
brazing in the line set! The braze, when complete,
must be quenched with water to absorb any residual
heat.

2. Do not open service valves until refrigerant lines and
indoor coil have been leak-tested and evacuated.
Refer to procedures provided in this supplement.

SUCTION / VAPOR LINE

PREPARATION FOR NEXT STEP

After all connections have been brazed, disconnect manifold gauge set from service ports. Apply additional water saturated cloths to both

7

services valves to cool piping. Once piping is cool, remove all water saturated cloths. Refer to the unit installation instructions for the next step
in preparing the unit.

SUCTION / VAPOR LINE

SERVICE VALVE

WATER SATURATED
CLOTH

WHEN BRAZING LINE SET TO

SERVICE VALVES, POINT FLAME

AWAY FROM SERVICE VALVE.

Figure 8. Brazing Procedures (continued)

Page 17

13ACX SERIES

Flushing Line Set and Indoor Coil

TYPICAL EXISTING FIXED ORIFICE

1A

DISTRIBUTOR

ASSEMBLY

A On fully cased coils, remove the coil access and plumbing panels.
B Remove any shipping clamps holding the liquid line and distributor as

sembly.

C Using two wrenches, disconnect liquid line from liquid line orifice hous

ing. Take care not to twist or damage distributor tubes during this pro
cess.

D Remove and discard fixed orifice, valve stem assembly if present and

Teflon® washer as illustrated above.

E Use a field-provided fitting to temporary reconnect the liquid line to the

indoor unit's liquid line orifice housing.

COIL SHOWN)

DISTRIBUTOR TUBES

LIQUID LINE ORIFICE HOUSING

REMOVE AND DISCARD

WHITE TEFLON

(IF PRESENT)

TEFLON® RING

FIXED ORIFICE

®

SEAL

LIQUID LINE ASSEMBLY

(INCLUDES STRAINER)

REMOVAL PROCEDURE (UNCASED

OR

BRASS NUT

1B

TWO PIECE PATCH PLATE

(UNCASED COIL ONLY)

CONNECT GAUGES AND EQUIPMENT FOR
FLUSHING PROCEDURE

2

INVERTED HCFC-22
CYLINDER CONTAINS
CLEAN HCFC-22 TO BE
USED FOR FLUSHING.

A

1

VAPOR LINE

SERVICE VALVE

EXISTING

INDOOR

UNIT

LIQUID LINE SERVICE

VALV E

VAPOR

LIQUID

D

RECOVERY

CYLINDER

A Inverted HCFC-22 cylinder with clean refrigerant to the vapor service

valve.

B HCFC-22 gauge set (low side) to the liquid line valve.
C HCFC-22 gauge set center port to inlet on the recovery machine with an

empty recovery tank to the gauge set.

D Connect recovery tank to recovery machines per machine instructions.

OUTDOOR

B

NEW

UNIT

OPENED

C

RECOVERY MACHINE

GAUGE

MANIFOLD

LOW HIGH

CLOSED

TANK
RETURN

INLET

DISCHARGE

TYPICAL EXISTING EXPANSION VALVE REMOVAL
PROCEDURE (UNCASED COIL SHOWN)

ORIFICE

HOUSING

EQUALIZER
LINE

STUB END

TEFLON
RING

VAPOR

CHECK

EXPANSION

VALV E

®

LIQUID LINE

ASSEMBLY WITH

BRASS NUT

LINE

TEFLON

RING

®

SENSING

LINE

LIQUID

LINE

LIQUID LINE

DISTRIBUTOR

TUBES

DISTRIBUTOR

ASSEMBLY

MALE EQUALIZER

LINE FITTING

SENSING BULB

A On fully cased coils, remove the coil access and plumbing panels.
B Remove any shipping clamps holding the liquid line and distributor

assembly.

C Disconnect the equalizer line from the check expansion valve

equalizer line fitting on the vapor line.

D Remove the vapor line sensing bulb.
E Disconnect the liquid line from the check expansion valve at the liquid

line assembly.

F Disconnect the check expansion valve from the liquid line orifice

housing. Take care not to twist or damage distributor tubes during this
process.

G Remove and discard check expansion valve and the two Teflon® rings.
H Use a field-provided fitting to temporary reconnect the liquid line to the

indoor unit's liquid line orifice housing.

FLUSHING LINE SET

The line set and indoor unit coil must be flushed with at least the

3

same amount of clean refrigerant that previously charged the
system. Check the charge in the flushing cylinder before
proceeding.

A Set the recovery machine for liquid recovery and start the

recovery machine. Open the gauge set valves to allow the
recovery machine to pull a vacuum on the existing system line

B

set and indoor unit coil.

B Invert the cylinder of clean HCFC-22 and open its valve to allow

liquid refrigerant to flow into the system through the vapor line
valve. Allow the refrigerant to pass from the cylinder and through
the line set and the indoor unit coil before it enters the recovery
machine.

C After all of the liquid refrigerant has been recovered, switch the

recovery machine to vapor recovery so that all of the HCFC-22
vapor is recovered. Allow the recovery machine to pull down to 0
the system.

D Close the valve on the inverted HCFC-22 drum and the gauge

set valves. Pump the remaining refrigerant out of the recovery
machine and turn the machine off.

Figure 9. Removing Metering Device and Flushing

Page 18

Installing Indoor Metering Device

This outdoor unit is designed for use in systems that use
either an fixed orifice (RFC), or expansion valve metering
devices at the indoor coil.

See the Lennox 13ACX Product Specification bulletin for
approved expansion valve kit match-ups. The expansion

valve unit can be installed internal or external to the indoor
coil. In applications where an uncased coil is being
installed in a field-provided plenum, install the expansion
valve in a manner that will provide access for field servicing
of the expansion valve. Refer to below illustration for
reference during installation of expansion valve unit.

INDOOR EXPANSION VALVE INSTALLATION

TWO PIECE

PATCH PLATE

(UNCASED

COIL ONLY)

DISTRIBUTOR

TUBES

DISTRIBUTOR

ASSEMBLY

MALE EQUALIZER LINE

FITTING (SEE

EQUALIZER LINE

INSTALLATION FOR

FURTHER DETAILS)

(Uncased Coil Shown)

LIQUID LINE

ORIFICE

HOUSING

STUB

END

TEFLON
RING

EQUALIZER
LINE

VAPOR

EXPANSION

VALV E

®

LIQUID LINE

ASSEMBLY WITH

LINE

TEFLON

RING

SENSING

BRASS NUT

LIQUID LINE

Sensing bulb insulation is required if
mounted external to the coil casing. sensing
bulb installation for bulb positioning.

EQUALIZER LINE INSTALLATION

A Remove and discard either the flare seal cap or flare nut

with copper flare seal bonnet from the equalizer line port
on the vapor line as illustrated in the figure to the right.

B Remove and discard either the flare seal cap or flare nut

with copper flare seal bonnet from the equalizer line port on
the vapor line as illustrated in the figure to the right.

®

LINE

A Remove the field-provided fitting that temporary

reconnected the liquid line to the indoor unit's distributor
assembly.

B Install one of the provided Teflon® rings around the

stubbed end of the expansion valve and lightly lubricate
the connector threads and expose surface of the Teflon
ring with refrigerant oil.

C Attach the stubbed end of the expansion valve to the

liquid line orifice housing. Finger tighten and use an
appropriately sized wrench to turn an additional 1/2 turn
clockwise as illustrated in the figure above, or 20 ft-lb.

D Place the remaining Teflon® washer around the other

end of the expansion valve. Lightly lubricate connector
threads and expose surface of the Teflon® ring with
refrigerant oil.

E Attach the liquid line assembly to the expansion valve.

Finger tighten and use an appropriately sized wrench to
turn an additional 1/2 turn clockwise as illustrated in the
figure above or 20 ft-lb.

SENSING BULB INSTALLATION

A Attach the vapor line sensing bulb in the proper

orientation as illustrated to the right using the clamp and
screws provided.

NOTE — Confirm proper thermal contact between vapor line
and expansion bulb before insulating the sensing bulb once
installed.

B Connect the equalizer line from the expansion valve to

the equalizer vapor port on the vapor line. Finger tighten
the flare nut plus 1/8 turn (7 ft-lbs) as illustrated below.

VAPOR LINE

BULB

12

ON LINES SMALLER THAN
7/8”, MOUNT SENSING
BULB AT EITHER THE 3 OR
9 O'CLOCK POSITION.

BULB

®

1/2 Turn

11

10

9

8

7

1/8 Turn

11

10

9

8

7

12

1

2

3

4

5

6

12

1

2

3

4

5

6

FLARE SEAL CAP

OR

Figure 10. Installing Indoor Expansion Valve

FLARE NUT

COPPER FLARE
SEAL BONNET

MALE BRASS EQUALIZER
LINE FITTING

VAPOR LINE

Page 19

VAPOR LINE

12

BULB

NOTE — NEVER MOUNT ON BOTTOM OF LINE.

ON 7/8” AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O'CLOCK
POSITION. NEVER MOUNT ON
BOTTOM OF LINE.

BULB

13ACX SERIES

IMPORTANT

The Environmental Protection Agency (EPA) prohibits
the intentional venting of HFC refrigerants during
maintenance, service, repair and disposal of appliance.
Approved methods of recovery, recycling or reclaiming
must be followed.

IMPORTANT

If this unit is being matched with an approved line set
or indoor unit coil which was previously charged with
mineral oil, or if it is being matched with a coil which
was manufactured before January of 1999, the coil
and line set must be flushed prior to installation. Take
care to empty all existing traps. Polyol ester (POE) oils
are used in Lennox units charged with HFC-410A
refrigerant. Residual mineral oil can act as an
insulator, preventing proper heat transfer. It can also
clog the expansion device, and reduce the system
performance and capacity.
Failure to properly flush the system per the
instructions below will void the warranty.

CONNECT GAUGE SET

A Connect an HFC-410A manifold gauge set high pressure

1

hose to the vapor valve service port.

NOTE — Normally, the high pressure hose is connected to
the liquid line port. However, connecting it to the vapor port
better protects the manifold gauge set from high pressure
damage.

B With both manifold valves closed, connect the cylinder of

HFC-410A refrigerant to the center port of the manifold gauge
set.

NOTE — Later in the procedure,
the HFC-410A container will be
replaced by the nitrogen
container.

Leak Test Line Set and Indoor Coil

WARNING

When using a high pressure gas such as
dry nitrogen to pressurize a refrigeration
or air conditioning system, use a
regulator that can control the pressure
down to 1 or 2 psig (6.9 to 13.8 kPa).

IMPORTANT

Leak detector must be capable of sensing HFC
refrigerant.

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.

HIGHLOW

MANIFOLD GAUGE SET

OUTDOOR UNIT

B

A

TO VAPOR

SERVICE VALVE

NITROGEN

HFC-410A

TEST FOR LEAKS

After the line set has been connected to the indoor and outdoor units, check the line set connections and indoor unit for leaks. Use the

2

following procedure to test for leaks:

A With both manifold valves closed, connect the cylinder of HFC-410A refrigerant to the center port of the manifold gauge set. Open the valve

on the HFC-410A cylinder (vapor only).

B Open the high pressure side of the manifold to allow HFC-410A into the line set and indoor unit. Weigh in a trace amount of HFC-410A. [A

trace amount is a maximum of two ounces (57 g) refrigerant or three pounds (31 kPa) pressure]. Close the valve on the HFC-410A cylinder

and the valve on the high pressure side of the manifold gauge set. Disconnect the HFC-410A cylinder.

C Connect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gauge set.

D Adjust dry nitrogen pressure to 150 psig (1034 kPa). Open the valve on the high side of the manifold gauge set in order to pressurize the line set

and the indoor unit.

E After a few minutes, open one of the service valve ports and verify that the refrigerant added to the system earlier is measurable with a leak

detector.

F After leak testing disconnect gauges from service ports.

Figure 11. Leak Test

Page 20

Evacuating Line Set and Indoor Coil

CONNECT GAUGE SET

NOTE — Remove cores from service valves (if not already done).

1

A Connect low side of manifold gauge set

with 1/4 SAE in-line tee to vapor line
service valve

B Connect high side of manifold gauge

set to liquid line service valve

C Connect micron gauge available

connector on the 1/4 SAE in-line tee.

D Connect the vacuum pump (with

vacuum gauge) to the center port of the
manifold gauge set. The center port
line will be used later for both the
HFC-410A and nitrogen containers.

NITROGEN

HFC-410A

VACUUM PUMP

OUTDOOR

UNIT

A

B

A34000 1/4 SAE TEE WITH
SWIVEL COUPLER

500

C

MICRON

GAUGE

MANIFOLD

GAUGE SET

TO VAPOR

SERVICE VALVE

TO LIQUID LINE
SERVICE VALVE

LOW

D

EVACUATE THE SYSTEM

A Open both manifold valves and start the vacuum pump.

2

B Evacuate the line set and indoor unit to an absolute pressure of 23,000 microns (29.01 inches of mercury).

NOTE — During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once. A rapid rise in pressure
indicates a relatively large leak. If this occurs, repeat the leak testing procedure.

NOTE — The term absolute pressure means the total actual pressure within a given volume or system, above the absolute zero of
pressure. Absolute pressure in a vacuum is equal to atmospheric pressure minus vacuum pressure.

C When the absolute pressure reaches 23,000 microns (29.01 inches of mercury), perform the following:

 Close manifold gauge valves
 Close valve on vacuum pump
 Turn off vacuum pump
 Disconnect manifold gauge center port hose from vacuum pump
 Attach manifold center port hose to a dry nitrogen cylinder with pressure regulator set to 150 psig (1034 kPa) and purge the hose.
 Open manifold gauge valves to break the vacuum in the line set and indoor unit.
 Close manifold gauge valves.

D Shut off the dry nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold gauge valves to release the

dry nitrogen from the line set and indoor unit.

E Reconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the line set and indoor unit until the

absolute pressure does not rise above 500 microns (29.9 inches of mercury) within a 20-minute period after shutting off the vacuum pump
and closing the manifold gauge valves.

F When the absolute pressure requirement above has been met, disconnect the manifold hose from the vacuum pump and connect it to an

upright cylinder of HFC-410A refrigerant. Open the manifold gauge valve 1 to 2 psig in order to release the vacuum in the line set and
indoor unit.

G Perform the following:

 Close manifold gauge valves.
 Shut off HFC-410A cylinder.
 Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with core

tool while maintaining a positive system pressure.

 Replace stem caps and secure finger tight, then tighten an additional one-sixth (1/6) of a turn as illustrated.

RECOMMEND

MINIMUM 3/8” HOSE

10

9

11

8

1/6 TURN

12

7

6

HIGH

1

2

3

4

5

Figure 12. Evacuating System

Page 21

13ACX SERIES

WARNING

Danger of Equipment Damage. Avoid deep vacuum
operation. Do not use compressors to evacuate a
system. Extremely low vacuums can cause internal
arcing and compressor failure. Damage caused by
deep vacuum operation will void warranty.

CAUTION

Brazing alloys and flux contain materials which are
hazardous to your health.

Avoid breathing vapors or fumes from brazing
operations. Perform operations only in well ventilated
areas.

Wear gloves and protective goggles or face shield to
protect against burns.

Wash hands with soap and water after handling brazing
alloys and flux.

Evacuating the system of non-condensables is critical for
proper operation of the unit. Non-condensables are

defined as any gas that will not condense under
temperatures and pressures present during operation of
an air conditioning system. Non-condensables and water
suction combine with refrigerant to produce substances
that corrode copper piping and compressor parts.

IMPORTANT

Use a thermocouple or thermistor electronic vacuum
gauge that is calibrated in microns. Use an instrument
capable of accurately measuring down to 50 microns.

Electrical

In the U.S.A., wiring must conform with current local codes
and the current National Electric Code (NEC). In Canada,
wiring must conform with current local codes and the current
Canadian Electrical Code (CEC).

Refer to the furnace or air handler installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size.

24VAC TRANSFORMER

Use the transformer provided with the furnace or air
handler for low‐voltage control power (24VAC - 40 VA
minimum)

SIZE CIRCUIT AND INSTALL SERVICE
DISCONNECT SWITCH

Refer to the unit nameplate for minimum circuit ampacity, and maximum
fuse or circuit breaker (HACR per NEC). Install power wiring and properly
sized disconnect switch.

MAIN FUSE BOX/

BREAKER PANEL

SERVICE

DISCONNECT

SWITCH

NOTE — Units are approved for use only with copper conductors.
Ground unit at disconnect switch or to an earth ground.

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.

INSTALL THERMOSTAT

Install room thermostat (ordered separately) on an inside wall
approximately in the center of the conditioned area and 5 feet (1.5m) from
the floor. It should not be installed on an outside wall or where it can be
affected by sunlight or drafts.

THERMOSTAT

5 FEET

(1.5M)

NOTE — 24VAC, Class II circuit connections are made in the control
panel.

Page 22

ROUTING HIGH VOLTAGE/ GROUND AND CONTROL WIRING

HIGH VOLTAGE / GROUND WIRES

Any excess high voltage field wiring should be trimmed and
secured away from any low voltage field wiring. To facilitate a
conduit, a cutout is located in the bottom of the control panel.
Connect conduit to the control panel using a proper conduit fitting.

HIGH VOLTAGE
CONNECTIONS

(CONTACTOR)

CONTROL WIRING

NOTE — Wire tie provides low voltage control wire strain relief and to
maintain separation of field installed low and high voltage circuits.

NOTE — For proper voltages, select thermostat wire (control wires)
gauge per table above.

NOTE — Do not bundle any excess 24VAC control wires inside
control panel.

Install low voltage wiring from outdoor to indoor unit and from thermostat
to indoor unit as illustrated.

A Run 24VAC control wires through hole with grommet and secure with

provided wire tie.

B Make 24VAC thermostat wire connections. Locate the two wires from the

contactor and make connection using field provided wire nuts:

HIGH VOLTAGE
FIELD WIRING

LOW VOLTAGE
FIELD WIRING

FACTORY
WIRING

 Yellow to Y1
 Black to C (common)

WIRE RUN LENGTH AWG# INSULATION TYPE

LESS THAN 100' (30 METERS) 18 TEMPERATURE RATING

MORE THAN 100' (30 METERS) 16 35ºC MINIMUM.

SINGLE PHASE

GROUND

HIGH VOLTAGE
FLEXIBLE CONDUIT

THERMOSTAT INDOOR UNIT

W1

G

R

Y

POWER

HEAT

COOLING

INDOOR

BLOWER

R

W

Y

G

B

CONTROL

WIRING

OUTDOOR

UNIT

Y1

A

GROMMET

AND WIRE TIE

System Operation

IMPORTANT

Some scroll compressor have internal vacuum protector
that will unload scrolls when suction pressure goes
below 20 psig. A hissing sound will be heard when the
compressor is running unloaded. Protector will reset
when low pressure in system is raised above 40 psig. DO
NOT REPLACE COMPRESSOR.

The outdoor unit and indoor blower will cycle on and off as
dictated by demands from the room thermostat. When the
thermostat's blower switch is in the ON position, the indoor
blower will operate continuously.

MANUAL HIGH PRESSURE SWITCH (S4) - USED ON
MODELS 13ACX-XXX-230-01 THROUGH -09

Some 13ACX units are equipped with a manual
high‐pressure switch that is located in the liquid line of the
compressor as illustrated in figure on page 2 and figure 13
for the location of the manual reset button.

COMMON

C

MANUAL RESET

BUTTON

C

C

Figure 13. High Pressure Switch (S4) Manual Reset

The switch is a Single Pole, Single Throw (SPST),
manual-reset switch which is normally closed and
removes power from the compressor when discharge
pressure rises above factory setting at 590 + 10 psi. The
manual-reset button can be identified by a red cap that is
press to preform the reset function.

AUTOMATIC HIGH PRESSURE SWITCH (S4) - USED
ON MODELS 13ACX-XXX-230-10 AND LATER

The 13ACX is equipped with an auto-reset high pressure
switch (single-pole, single-throw) which is located on the
liquid line. The switch shuts off the compressor when
discharge pressure rises above the factory setting. The
switch is normally closed and is permanently adjusted to
trip (open) at 590 + 15 psig (4068 + 103 kPa).

Page 23

13ACX SERIES

Maintenance

WARNING

Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at disconnect
switch(es). Unit may have multiple power
supplies.

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.

Maintenance and service must be performed by a qualified
installer or service agency. At the beginning of each
cooling season, the system should be checked as follows:

Outdoor Unit

1. Outdoor unit fan motor is pre-lubricated and sealed.
No further lubrication is needed.

2. Visually inspect all connecting lines, joints and coils for
evidence of oil leaks.

3. Check all wiring for loose connections.

4. Check for correct voltage at unit (unit operating).

5. Check amp draw on outdoor fan motor.

Motor Nameplate:_________ Actual:__________.

6. Inspect drain holes in coil compartment base and
clean if necessary.

NOTE ‐ If insufficient cooling occurs, the unit should be
gauged and refrigerant charge should be checked.

Outdoor Coil

Clean and inspect outdoor coil (may be flushed with a
water hose). Ensure power is off before cleaning.

NOTE — It may be necessary to flush the outdoor coil
more frequently if it is exposed to substances which are
corrosive or which block airflow across the coil (e.g., pet
urine, cottonwood seeds, fertilizers, fluids that may
contain high levels of corrosive chemicals such as salts)

Sea Coast — Moist air in ocean locations can carry salt,
which is corrosive to most metal. Units that are located
near the ocean require frequent inspections and
maintenance. These inspections will determine the
necessary need to wash the unit including the outdoor coil.
Consult your installing contractor for proper
intervals/procedures for your geographic area or service
contract.

Indoor Unit

1. Clean or change filters.

2. Lennox blower motors are prelubricated and
permanently sealed. No more lubrication is needed.

3. Adjust blower speed for cooling. Measure the pressure
drop over the coil to determine the correct blower CFM.
Refer to the unit information service manual for pressure
drop tables and procedure.

4. Belt Drive Blowers - Check belt for wear and proper
tension.

5. Check all wiring for loose connections.

6. Check for correct voltage at unit. (blower operating)

7. Check amp draw on blower motor.

Motor Nameplate:_________ Actual:__________.

Indoor Coil

1. Clean coil if necessary.

2. Check connecting lines, joints and coil for evidence of
oil leaks.

3. Check condensate line and clean if necessary.

Page 24

Start-Up and Performance Checklist

Job Name Job no. Date

Job Location City State

Installer City State

Unit Model No. Serial No. Service Technician

Nameplate Voltage

Rated Load Ampacity Compressor Outdoor Fan

Maximum Fuse or Circuit Breaker

Electrical Connections Tight?  Indoor Filter clean?  Supply Voltage (Unit Off)

Indoor Blower RPM S.P. Drop Over Indoor (Dry) Outdoor Coil Entering Air Temp.

Discharge Pressure Suction Pressure Refrigerant Charge Checked? 

Refrigerant Lines: Leak Checked?  Properly Insulated?  Outdoor Fan Checked? 

Service Valves: Fully Opened?  Caps Tight?  Thermostat

Voltage With Compressor Operating Calibrated?  Properly Set?  Level? 

Page 25

13ACX SERIES

Sequence of Operations

NOTE- The thermostat used may be electromechanical or electronic.
NOTE- Transformer in indoor unit supplies power (24 VAC) to the thermostat and outdoor unit controls.

COOLING:

1- Cooling demand initiates at Y1 in the thermostat.
2- 24VAC from indoor unit (Y1) energizes the TOC timed off control (if used) which energizes contactor K1

(provided S4 high pressure switch is closed).
3- K1‐1 N.O. closes, energizing compressor (B1) and outdoor fan motor (B4).
4- Compressor (B1) and outdoor fan motor (B4) begin immediate operation..

END OF COOLING DEMAND:

5- Cooling demand is satisfied. Terminal Y1 is de‐energized .
6- Compressor contactor K1 is de‐energized.
7- K1‐1 opens and compressor (B1) and outdoor fan motor (B4) are de‐energized and stop immediately.

Figure 14. Use for 13ACX-XXX-230-01 through -10

Page 26

Figure 15. Use for 13ACX-XXX-230-11 or later

Page 27

13ACX SERIES

Servicing Units Void of Charge

If the outdoor unit is void of refrigerant, clean the system
using the procedure described below.

1. Leak check system using procedure outlined in figure

11.

2. Evacuate the system using procedure outlined in
figure 12.

3. Use nitrogen to break the vacuum and install a new
filter drier in the system.

4. Evacuate the system again using procedure outlined
on figure 12.

5. Weigh in refrigerant using procedure outlined under

figure 19.

Unit Start-Up

IMPORTANT

If unit is equipped with a crankcase heater, it should be
energized 24 hours before unit start-up to prevent
compressor damage as a result of slugging.

1. Rotate fan to check for binding.

2. Inspect all factory- and field-installed wiring for loose
connections.

3. After evacuation is complete, open the liquid line and
suction line service valves to release the refrigerant
charge (contained in outdoor unit) into the system.

4. Replace the stem caps and tighten as specified in
Operating Service Valves on page 9.

5. Check voltage supply at the disconnect switch. The
voltage must be within the range listed on the unit's
nameplate. If not, do not start the equipment until you
have consulted with the power company and the
voltage condition has been corrected.

6. Set the thermostat for a cooling demand. Turn on
power to the indoor indoor unit and close the outdoor
unit disconnect switch to start the unit.

7. Recheck voltage while the unit is running. Power must
be within range shown on the nameplate.

8. Check system for sufficient refrigerate using the
procedures that follow.

System Refrigerant

This section outlines procedures for:

1. Connecting gauge set for testing and charging;

2. Checking and adjusting indoor airflow;

3. Adding or removing refrigerant.

GAUGE SET

CONNECTIONS FOR TESTING AND CHARGING

SUCTION LINE

B

SERVICE PORT
CONNECTION

REFRIGERANT TANK

CHARGE IN

LIQUID PHASE

DIGITAL SCALE

TEMPERATURE

D

SENSOR

AClose manifold gauge set valves and connect the center hose to a cylinder of HFC-410A. Set for liquid phase charging.

BConnect the manifold gauge set's low pressure side to the suction line service port.

CConnect the manifold gauge set's high pressure side to the liquid line service port.

DPosition temperature sensor on liquid line near liquid line service port.

MANIFOLD GAUGE SET

LOW

A

C

TO LIQUID

LINE SERVICE

VALV E

HIGH

TEMPERATURE SENSOR

(LIQUID LINE)

OUTDOOR UNIT

Figure 16. Gauge Set Setup and Connections

Page 28

ADDING OR REMOVING REFRIGERANT

This system uses HFC-410A refrigerant which operates at much higher pressures than HCFC-22. The pre-installed liquid
line filter drier is approved for use with HFC-410A only. Do not replace it with components designed for use with HCFC-22.
This unit is NOT approved for use with coils which use capillary tubes or fixed orifices as a refrigerant metering device.

Check airflow using the Delta-T (

DT) process using the illustration in figure 17.

AIRFLOW

INDOOR COIL

Temperature of air
entering indoor
coil ºF

A

Wet-bulb ºF

80 24 24 24 23 23 22 22 22 20 19 18 17 16 15
78 23 23 23 22 22 21 21 20 19 18 17 16 15 14
76 22 22 22 21 21 20 19 19 18 17 16 15 14 13

Dry-bulb

74 21 21 21 20 19 19 18 17 16 16 15 14 13 12
72 20 20 19 18 17 17 16 15 15 14 13 12 11 10
70 19 19 18 18 17 17 16 15 15 14 13 12 11 10

57 58 59 60 61 62 63 64 65 66 67 68 69 70

DT

DRY

BULB

C

53º

T

19º

Drop

air flow

air flow

B

B

64º

All temperatures are expressed in ºF

INDOOR COIL

WET BULB

Use the following procedure to adjust for optimal air flow across the indoor coil:

1. Determine the desired DT — Measure entering air temperature using dry bulb (A) and wet bulb (B). DT

is the intersecting value of A and B in the table (see triangle).

2. Find temperature drop across coil — Measure the coil's dry bulb entering and leaving air temperatures
(A and C). Temperature Drop Formula: (T

3. Determine if fan needs adjustment — If the difference between the measured T

DT (T

–DT) is within +3º, no adjustment is needed. See example below:

Drop

) = A minus C.

Drop

and the desired

Drop

Assume DT = 15 and A temp. = 72º, these C temperatures would necessitate stated actions:

A

72º

DRY BULB

Cº T

53º 19 – 15 = 4 Increase the airflow
58º 14 – 15 = -1 (within +3º range) no change
62º 10 – 15 = -5 Decrease the airflow

– DT = ºF ACTION

Drop

4. Adjust the fan speed — See indoor unit instructions to increase/decrease fan speed.

Figure 17. Checking Indoor Airflow over Evaporator Coil using Delta-T Chart

Changing air flow affects all temperatures; recheck
temperatures to confirm that the temperature drop
and DT are within +3º.

Page 29

13ACX SERIES

START: Determine how refrigerant is metered

WHEN TO CHARGE?

 Warm weather best
 Can charge in colder weather

CHARGE METHOD? Determine by:

 Metering device type
 Outdoor ambient temperature

REQUIREMENTS:

 Sufficient heat load in structure
 Indoor temperature between 70‐80ºF

(21-26ºC)

(18.3ºC) and

Above

 Manifold gauge set connected to unit
 Thermometers:

- to measure outdoor ambient
temperature

- to measure liquid line temperature

- to measure suction line
temperature

APPROACH OR

SUBCOOLING

Figure 18. Determining Charge Method

65ºF

TXV

64ºF

(17.7ºC) and

Below

WEIGH‐IN

Which

metering

device?

40ºF

(4.4ºC) and

Above

RFC

39ºF

(3.8ºC) and

Below

WEIGH‐INSUPERHEAT

WEIGH IN (RFC AND TXV)

CALCULATING SYSTEM CHARGE FOR OUTDOOR UNIT
VOID OF CHARGE

If the system is void of refrigerant, first, locate and repair any leaks and then weigh in the refrigerant charge into the
unit. To calculate the total refrigerant charge:

Adjust amount. for variation

Amount specified on

nameplate

NOTE — The above nameplate is for
illustration purposes only. Go to actual
nameplate on outdoor unit for charge
information.

NOTE — Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the
temperature of the liquid line or when pressure drop is equal to or greater than 20 psig.

Liquid Line Set Di

in line set length listed on

line set length table below.

+

Refrigerant Charge per Line Set Length

ameter

3/8” (9.5 mm)

Total charge

=

Ounces per 5 feet (g per 1.5 m) adjust from

15 feet (4.6 m) line set*

3 ounce per 5' (85 g per 1.5 m)

Figure 19. Using HFC-410A Weigh In Method

Page 30

START: Measure outdoor ambient temperature

DO NOT CHARGE UNIT

USE WEIGH‐IN METHOD

(Results of charging at low

Weigh‐in or remove refriger

temperatures not reliable)

ant based upon line length

64ºF

(17.7ºC) and

APPROACH TXV

If refrigerant is added
or removed, retest to
confirm that unit is
properly charged.

If value is greater than
shown (high approach),
add refrigerant; if less
than shown (liquid
temperature too close to
ambient temperature,
low approach), remove
refrigerant.

Below

Figure 20. HFC-410A Approach TXV Charge

START: Measure outdoor ambient temperature

USE WEIGH‐IN METHOD

DO NOT CHARGE UNIT

Weigh‐in or remove refrigerant

(Results of charging at low

based upon line length

temperatures not reliable)

SUBCOOLING TXV

If refrigerant is
added or removed,
verify charge using
the Approach
Method.

If value is
MORE than
shown, remove
refrigerant.

BLOCK OUTDOOR COIL: [sometimes necessary with
lower temperatures] Use cardboard or plastic sheet to
restrict the airflow through the outdoor coil to achieve
pressures from 325-375 psig (2240-2585 kPa). Higher
pressures are needed to check charge. Block equal
sections of air intake panels and move coverings sideways
until the liquid pressure is in the above noted ranges.

64ºF

(17.7ºC) and

Below

CARDBOARD OR PLASTIC SHEET

65ºF

(18.3ºC) and

Above

ABOVE or

BELOW

1. Confirm proper airflow across coil using figure 17.

2. Compare unit pressures with normal operating
pressures provided on applicable charging sticker
as reference in table 4..

3. Set thermostat to call for heat (must have a cooling
load between 70‐80ºF (21-26ºC).

4. Connect gauge set.

5. When heat demand is satisfied, set thermostat to
call for cooling.

6. Allow temperatures and pressures to stabilize.

7. Record outdoor ambient temperature:

AMBº =_________

8. Record liquid line temperature:

LIQº = __________

9. Subtract to determine approach (APPº):

LIQº_____ - AMBº _____ = APPº_____

10. Compare results with table below.

See Table 4 on page 33 to determine

which charging sticker to use.

1. Confirm proper airflow across coil using figure

65ºF

(18.3ºC) and

Above

ABOVE or

BELOW

17.

2. Compare unit pressures with normal operating
pressures provided on applicable charging
sticker as reference in table 4.

3. Set thermostat to call for heat (must have a
cooling load between 70‐80ºF (21-26ºC)

4. Connect gauge set

5. Measure outdoor ambient temperature

6. When heat demand is satisfied, set thermostat to
call for cooling

7. Allow temperatures and pressures to stabilize.

NOTE - If necessary, block outdoor coil to
maintain 325 - 375 psig.

8. Record liquid line temperature:

LIQº = ______

9. Measure liquid line pressure and use the value to
determine saturation temperature (see table 3):

SATº = ______

10. Subtract to determine subcooling (SCº):

SATº_____ - LIQº _____ = SCº _____

11. Compare results with table below.

If value is LESS
than shown, add
refrigerant.

MORE or

LESS

See Table 4 on page 33 to determine

which charging sticker to use.

Figure 21. HFC-410A Subcooling TXV Charge

Page 31

13ACX SERIES

START: Measure outdoor ambient temperature

USE WEIGH‐IN METHOD

Weigh‐in or remove refrigerant
based upon line length

SUPERHEAT RFC

See Table 4 on page 33 to determine

40ºF

(4.4ºC) and

Above

which charging sticker to use.

(3.8ºC) and

ABOVE or

BELOW

39ºF

Below

1. Confirm proper airflow across coil using figure 17.

2. Compare unit pressures with normal operating
pressures provided on applicable charging
sticker as reference in table 4.

3. Use SUPERHEAT to correctly charge unit or to
verify the charge is correct.

4. Set thermostat to call for heat (must have a cooling

load between 70‐80ºF (21-26ºC)

5. Connect gauge set.

6. When heat demand is satisfied, set thermostat to

call for cooling.

7. Allow temperatures and pressures to stabilize.

8. Measure the suction line pressure and use the use

value to determine saturation temperature (table

3):

SATº =_________

9. Record suction line temperature:

VAPº =_________

10. Subtract to determine superheat (SHº):

VAPº - _____ SATº ______ = SHº______

11. Record the wet bulb temperature (air entering
indoor coil):

WB =_______

12. Record outdoor ambient temperature.

13. Compare results with table to the left.

If refrigerant is
REMOVED, retest to
confirm that unit is
properly charged.

If value is LESS than
shown, then REMOVE
refrigerant.

MORE or

LESS

If value is MORE
than shown, then
ADD refrigerant.

NOTE - Do not attempt to charge system where a
dash appears, system could be overcharged.
Superheat is taken at suction line service port.
Suction line superheat must never be less than 5ºF
at the suction line service port.

If refrigerant is
ADDED, retest to
confirm that unit is
properly charged.

Figure 22. HFC-410A Superheat RFC Method

Table 3. HFC-410A Temperature — Pressure (Psig)

°F °C Psig °F °C Psig

-40 -40.0 11.6 60 15.6 170

-35 -37.2 14.9 65 18.3 185

-30 -34.4 18.5 70 21.1 201

-25 -31.7 22.5 75 23.9 217

-20 -28.9 26.9 80 26.7 235

-15 -26.1 31.7 85 29.4 254

-10 -23.3 36.8 90 32.2 274

-5 -20.6 42.5 95 35.0 295
0 -17.8 48.6 100 37.8 317
5 -15.0 55.2 105 40.6 340

10 -12.2 62.3 11 0 43.3 365
15 -9.4 70.0 115 46.1 391
20 -6.7 78.3 120 48.9 418
25 -3.9 87.3
30 -1.1 96.8 130 54.4 476
35 1.7 107 135 57.2 507
40 4.4 118 140 60.0 539
45 7.2 130
50 10.0 142
55 12.8 155

125 51.7 446

145 62.8 573
150 65.6 608

Page 32

Table 4. Applicable Charging Sticker by Unit Model Number

Unit Model Number

401238S 401288S 580052-01 580450-01

Reference charging stickers above are located at the end of this manual.

13ACX-018-230-XX -01 -02. -10, -11, -12, -13, -14, -15 -17, -18

13ACX-024-230-XX -01 -02. -10, -11, -12, -13, -15 -17, -18, -19, -20

13ACX-030-230-XX -01 -02. -10, -11, -12, -13, -15 -17, -18, -19

13ACX-036-230-XX -02, -03, -10, -11, -12, -13, -14, -15 -17, -18

13ACX-042-230-XX -01 -02, -10, -11, -12, -13, -14, -15 -17, -18

13ACX-048-230-XX -01 -02, -10, -11, -12, -13, -14, -15 -17, -18, -19, -20, -21

13ACX-060-230-XX -02 -03, -10, -11, -12, -13, -14, -15 -16, -17, -18

Unit Charging Sticker Numbers

Page 33

13ACX SERIES

CHARGING INFORMATION

FOR COMPLETE CHARGING DETAILS, REFER TO THE OUTDOOR UNIT INSTALLATION INSTRUCTIONS.

AIRFLOW CHECK - Both airflow and refrigerant charge must be monitored
for a proper system set‐up. It may be necessary to alternately check and
adjust the airflow and the refrigerant charge.

NOTE - Be sure that filters and indoor and outdoor coils are clean before testing.

To determine temperature drop across indoor coil (Delta-T), measure the entering air dry
bulb (DB) and wet bulb (WB) temperatures at the indoor coil. Find Delta-T in table 1.. Mea
sure coil's leaving air DB and subtract that value from entering air DB. The measured differ
ence should be within +

3ºF (+1.8ºC) of table value; if too low, decrease the indoor fan speed
(refer to indoor unit for information). If the Delta-T is too high, increase the indoor fan speed.
Repeat charging procedure and Delta-T (air flow adjustment) procedure until both are cor
rect.

Example: assume entering air DB - 72, WB - 64, leaving DB - 53. Therefore, Delta-T should

be 15 (per table); delta across coil is 72 - 53 or 19 (which is 4ºF higher than table value); action
necessary: increase fan speed.

Table 1. Evaporator Coil Delta-T

Dry bulb 80 24 24 24 23 23 22 22 22 20 19 18 17 16 15
temperature 78 23 23 23 22 22 21 21 20 19 18 17 16 15 14
of air 76 22 22 22 21 21 20 19 19 18 17 16 15 14 13
entering 74 21 21 21 20 19 19 18 17 16 16 15 14 13 12
indoor 72 20 20 19 18 17 17 16 15 15 14 13 12 11 10
coil (ºF) 70 19 19 18 18 17 17 16 15 15 14 13 12 11 10

ºF 57 58 59 60 61 62 63 64 65 66 67 68 69 70

[ Wet bulb temperature of air entering indoor coil ]

Table 2. Superheat (SH) Value RFC System - +5ºF

40 15 18 20 23 26 29 32 34 38 41 43 46 48 51
45 13 16 18 21 24 27 30 33 36 39 41 44 46 49
50 11 14 16 19 22 25 28 31 34 37 39 42 44 47

Dry bulb 55 9 12141720232730333638404244
temperature 66 7 10121518212427303335384043
of ambient 65 ‐ 6 10 13 16 19 21 24 27 30 33 36 38 41
air entering 70 ‐ ‐ 7 1013161921242730333639
outdoor 75 ‐ ‐ ‐ 6 9 121518212428313437
unit (ºF) 80 ‐ ‐ ‐ ‐ 5 8 12 15 18 21 25 28 31 35

85 ‐‐‐‐‐‐811151922263033
90 ‐‐‐‐‐‐59131620242731

95 ‐‐‐‐‐‐‐6101418222529
100 ‐‐‐‐‐‐‐‐81216212428
105 ‐‐‐‐‐‐‐‐5913172226
110 ‐‐‐‐‐‐‐‐‐611152025
115 ‐‐‐‐‐‐‐‐‐‐8141824

ºF 50 52 54 56 58 60 62 64 66 68 70 72 74 76

[ Wet bulb temperature of air entering indoor coil ]

Model -18 -24 -30 -36 -42 -48 -60

Table 3. Normal Operating Pressures

1

°F(°C)2TXV System - Liquid Line (+10 psig) / Vapor Line (+5 psig)

65 (18) 244 / 135 249 / 137 241 / 134 253 / 134 250 / 135 240 / 130 242 / 130

70 (21) 262 / 136 268 / 138 259 / 135 274 / 135 268 / 137 257 / 131 266 / 131

75 (24) 281 / 137 288 / 138 279 / 136 293 / 136 288 / 138 278 / 132 286 / 132

80 (27) 302 / 138 309 / 140 300 / 137 315 / 137 310 / 139 299 / 133 309 / 133

85 (29) 323 / 139 331 / 140 322 / 138 338 / 139 332 / 140 323 / 134 332 / 134

90 (32) 346 / 141 355 / 142 345 / 140 361 / 139 356 / 140 344 / 135 357 / 135

95 (35) 369 / 142 379 / 143 369 / 141 385 / 141 381 / 141 369 / 136 381 / 136

100 (38) 394 / 143 402 / 144 393 / 142 410 / 142 406 / 143 394 / 137 407 / 137

105 (41) 417 / 145 430 / 145 418 / 143 436 / 143 432 / 143 418 / 139 433 / 138

110 (43) 445 / 146 457 / 146 445 / 144 463 / 145 459 / 145 446 / 140 459 / 140

115 (45) 476 / 148 485 / 147 474 / 145 491 / 146 490 / 145 477 / 141 488 / 141

RFC System - Liquid Line (+10 psig) / Vapor Line (+5 psig)

65 (18) 244 / 135 244 / 125 243 / 116 252 / 129 250 / 135 248 / 127 255 / 126
70 (21) 262 / 136 263 / 128 262 / 120 271 / 131 268 / 137 266 / 130 274 / 128
75 (24) 281 / 137 282 / 131 283 / 124 290 / 133 288 / 138 284 / 132 294 / 131
80 (27) 302 / 138 303 / 134 305 / 128 312 / 136 310 / 139 305 / 134 317 / 134
85 (29) 323 / 139 326 / 137 328 / 132 334 / 139 332 / 140 325 / 137 339 / 136
90 (32) 346 / 141 347 / 138 351 / 135 356 / 141 356 / 140 347 / 139 362 / 138

95 (35) 369 / 142 372 / 141 376 / 139 380 / 143 381 / 141 371 / 141 386 / 140
100 (38) 394 / 143 396 / 143 401 / 142 405 / 145 406 / 143 394 / 143 413 / 142
105 (41) 417 / 145 421 / 145 427 / 145 429 / 147 432 / 143 418 / 144 435 / 144
110 (43) 445 / 146 449 / 147 454 / 147 456 / 148 459 / 145 445 / 146 462 / 146
115 (46) 476 / 148 479 / 149 482 / 149 483 / 151 490 / 145 472 / 147 490 / 148

Table 4. Approach (APP) Values3 - TXV System - ºF (ºC) +1ºF (0.5ºC)

All 8 (4.5) 8 (4.5) 9 (5.0) 10 (5.6) 10 (5.6) 6 (3.3) 9 (5.0)

Table 5. Subcooling (SC) Values4 - TXV System - ºF (ºC) +1ºF (0.5ºC)

All 8 (4.1) 8 (4.1) 7 (3.8) 4 (2.2) 8 (4.4) 10 (5.6) 8 (4.4)

1 Typical pressures; indoor evaporator match up, indoor air quantity, and evaporator load will cause

the pressures to vary.

2 Temperature of air entering outside coil.
3 Approach = Liquid Line Temp. minus Outdoor Ambient Temperature
4 Subcooling = Saturation Temp. minus Liquid Line Temp Temperature

*2P0507* *P401238S*

05/07 401238S

CHARGING INFORMATION

FOR COMPLETE CHARGING DETAILS, REFER TO THE OUTDOOR UNIT INSTALLATION INSTUCTION.

AIRFLOW CHECK - Both airflow and refrigerant charge must be monitored
for a proper system set‐up. It may be necessary to alternately check and
adjust the airflow and the refrigerant charge.

NOTE - Be sure that filters and indoor and outdoor coils are clean before testing.

To determine temperature drop across indoor coil (Delta-T), measure the entering air dry
bulb (DB) and wet bulb (WB) temperatures at the indoor coil. Find Delta-T in table 1. Measure
coil's leaving air DB and subtract that value from entering air DB. The measured difference
should be within +

3ºF (+1.8ºC) of table value; if too low, decrease the indoor fan speed (refer
to indoor unit for information). If the Delta-T is too high, increase the indoor fan speed. Repeat
charging procedure and Delta-T (air flow adjustment) procedure until both are correct.

Example: assume entering air DB - 72, WB - 64, leaving DB - 53. Therefore, Delta-T should

be 15 (per table); delta across coil is 72 - 53 or 19 (which is 4ºF higher than table value); action
necessary: increase fan speed.

Table 1. Evaporator Coil Delta-T

Dry bulb 80 24 24 24 23 23 22 22 22 20 19 18 17 16 15
temperature 78 23 23 23 22 22 21 21 20 19 18 17 16 15 14
of air 76 22 22 22 21 21 20 19 19 18 17 16 15 14 13
entering 74 21 21 21 20 19 19 18 17 16 16 15 14 13 12
indoor 72 20 20 19 18 17 17 16 15 15 14 13 12 11 10
coil (ºF) 70 19 19 18 18 17 17 16 15 15 14 13 12 11 10

ºF 57 58 59 60 61 62 63 64 65 66 67 68 69 70

[ Wet bulb temperature of air entering indoor coil ]

Table 2. Superheat (SH) Value RFC System - +5ºF

40 15 18 20 23 26 29 32 34 38 41 43 46 48 51
45 13 16 18 21 24 27 30 33 36 39 41 44 46 49
50 11 14 16 19 22 25 28 31 34 37 39 42 44 47

Dry bulb 55 9 12141720232730333638404244
temperature 66 7 10121518212427303335384043
of ambient 65 ‐ 6 10 13 16 19 21 24 27 30 33 36 38 41
air entering 70 ‐ ‐ 7 1013161921242730333639
outdoor 75 ‐ ‐ ‐ 6 9 121518212428313437
unit (ºF) 80 ‐ ‐ ‐ ‐ 5 8 12 15 18 21 25 28 31 35

85 ‐‐‐‐‐‐811151922263033
90 ‐‐‐‐‐‐59131620242731

95 ‐‐‐‐‐‐‐6101418222529
100 ‐‐‐‐‐‐‐‐81216212428
105 ‐‐‐‐‐‐‐‐5913172226
110 ‐‐‐‐‐‐‐‐‐611152025
115 ‐‐‐‐‐‐‐‐‐‐8141824

ºF 50 52 54 56 58 60 62 64 66 68 70 72 74 76

[ Wet bulb temperature of air entering indoor coil ]

Model -18 -24 -30 -36 -42 -48 -60

Table 3. Normal Operating Pressures

1

°F(°C)2TXV System - Liquid Line (+10 psig) / Vapor Line (+5 psig)

65 (18) 233 / 132 244 / 137 248 / 127 263 / 135 250 / 135 240 / 130 242 / 130

70 (21) 251 / 133 263 / 138 263 / 131 281 / 138 268 / 137 257 / 131 266 / 131

75 (24) 265 / 133 285 / 139 284 / 132 302 / 140 288 / 138 278 / 132 286 / 132

80 (27) 292 / 135 307 / 140 307 / 134 325 / 142 310 / 139 299 / 133 309 / 133

85 (29) 314 / 136 329 / 141 330 / 135 349 / 142 332 / 140 323 / 134 332 / 134

90 (32) 338 / 137 354 / 142 355 / 136 375 / 143 356 / 140 344 / 135 357 / 135

95 (35) 362 / 138 379 / 143 380 / 137 404 / 144 381 / 141 369 / 136 381 / 136

100 (38) 388 / 140 404 / 144 407 / 138 433 / 145 406 / 143 394 / 137 407 / 137

105 (41) 415 / 141 438 / 145 434 / 139 462 / 147 432 / 143 418 / 139 433 / 138

110 (43) 444 / 142 464 / 147 465 / 141 494 / 149 459 / 145 446 / 140 459 / 140

115 (45) 475 / 143 495 / 148 497 / 142 527 / 150 490 / 145 477 / 141 488 / 141

°F(°C)2Fixed Orifice (RFC) - Liquid Line (+10 psig) / Vapor Line (+5 psig)

65 (18) 233 / 121 246 / 126 245 / 123 261 / 134 250 / 135 248 / 127 255 / 126

70 (21) 250 / 124 265 / 129 265 / 126 281 / 136 268 / 137 266 / 130 274 / 128

75 (24) 270 / 128 286 / 132 286 / 129 301 / 138 288 / 138 284 / 132 294 / 131

80 (27) 291 / 131 307 /135 308 / 132 324 / 140 310 / 139 305 / 134 317 / 134

85 (29) 313 / 134 330 / 137 331 / 135 346 / 142 332 / 140 325 / 137 339 / 136

90 (32) 335 / 136 353 / 140 355 / 138 371 / 144 356 / 140 347 / 139 362 / 138

95 (35) 359 / 138 378 / 142 380 / 140 396 / 146 381 / 141 371 / 141 386 / 140

100 (38) 383 / 140 402 / 143 405 / 142 422 / 148 406 / 143 394 / 143 413 / 142

105 (41) 409 / 142 428 / 145 431 / 144 448 / 150 432 / 143 418 / 144 435 / 144

110 (43) 436 / 145 456 / 147 458 / 146 477 / 151 459 / 145 445 / 146 462 / 146

115 (46) 464 / 147 486 / 149 487 / 148 506 / 153 490 / 145 472 / 147 490 / 148

Table 4. Approach (APP) Values3 - TXV System - ºF (ºC) +1ºF (0.5ºC)

All 4 (2.2) 8 (4.4) 8 (4.4) 11 (6.1) 10 (5.6) 6 (3.3) 9 (5.0)

Table 5. Subcooling (SC) Values4 - TXV System - ºF (ºC) +1ºF (0.5ºC)

All 10 (5.6) 10 (5.6) 9 (5.0) 12 (6.7) 8 (4.4) 10 (5.6) 7 (3.9)

1 Typical pressures; indoor evaporator match up, indoor air quantity, and evaporator load will cause

the pressures to vary.

2 Temperature of air entering outside coil.
3 Approach = Liquid Line Temp. minus Outdoor Ambient Temperature
4 Subcooling = Saturation Temp. minus Liquid Line Temp Temperature

*2P1107* *P401288S*

11/07 401288S

CHARGING INFORMATION

FOR COMPLETE CHARGING DETAILS, REFER TO THE OUTDOOR UNIT INSTALLATION INSTRUCTION.

AIRFLOW CHECK - Both airflow and refrigerant charge must be monitored
for a proper system set‐up. It may be necessary to alternately check and
adjust the airflow and the refrigerant charge.

NOTE - Be sure that filters and indoor and outdoor coils are clean before testing.

To determine temperature drop across indoor coil (Delta-T), measure the entering air dry
bulb (DB) and wet bulb (WB) temperatures at the indoor coil. Find Delta-T in table 1. Measure
coil's leaving air DB and subtract that value from entering air DB. The measured difference
should be within +

3ºF (+1.8ºC) of table value; if too low, decrease the indoor fan speed (refer
to indoor unit for information). If the Delta-T is too high, increase the indoor fan speed. Repeat
charging procedure and Delta-T (air flow adjustment) procedure until both are correct.

Example: assume entering air DB - 72, WB - 64, leaving DB - 53. Therefore, Delta-T should

be 15 (per table); delta across coil is 72 - 53 or 19 (which is 4ºF higher than table value); action
necessary: increase fan speed.

Table 1. Evaporator Coil Delta-T

Dry bulb 80 24 24 24 23 23 22 22 22 20 19 18 17 16 15
temperature 78 23 23 23 22 22 21 21 20 19 18 17 16 15 14
of air 76 22 22 22 21 21 20 19 19 18 17 16 15 14 13
entering 74 21 21 21 20 19 19 18 17 16 16 15 14 13 12
indoor 72 20 20 19 18 17 17 16 15 15 14 13 12 11 10
coil (ºF) 70 19 19 18 18 17 17 16 15 15 14 13 12 11 10

ºF 57 58 59 60 61 62 63 64 65 66 67 68 69 70

[ Wet bulb temperature of air entering indoor coil ]

Table 2. Superheat (SH) Value RFC System - +5ºF

40 15 18 20 23 26 29 32 34 38 41 43 46 48 51
45 13 16 18 21 24 27 30 33 36 39 41 44 46 49
50 11 14 16 19 22 25 28 31 34 37 39 42 44 47

Dry bulb 55 9 12141720232730333638404244
temperature 66 7 10121518212427303335384043
of ambient 65 ‐ 6 10 13 16 19 21 24 27 30 33 36 38 41
air entering 70 ‐ ‐ 7 1013161921242730333639
outdoor 75 ‐ ‐ ‐ 6 9 121518212428313437
unit (ºF) 80 ‐ ‐ ‐ ‐ 5 8 12 15 18 21 25 28 31 35

85 ‐‐‐‐‐‐811151922263033
90 ‐‐‐‐‐‐59131620242731

95 ‐‐‐‐‐‐‐6101418222529
100 ‐‐‐‐‐‐‐‐81216212428
105 ‐‐‐‐‐‐‐‐5913172226
110 ‐‐‐‐‐‐‐‐‐611152025
115 ‐‐‐‐‐‐‐‐‐‐8141824

ºF 50 52 54 56 58 60 62 64 66 68 70 72 74 76

[ Wet bulb temperature of air entering indoor coil ]

Size -18 -24 -30 -36 -42 -48 -60

Table 3. Normal Operating Pressures

1

°F(°C)2TXV System - Liquid Line (+10 psig) / Vapor Line (+5 psig)

65 (18) 233 / 132 244 / 137 248 / 127 263 / 135 238 / 132 235 / 132 241 / 130

70 (21) 251 / 133 263 / 138 263 / 131 281 / 138 262 / 133 254 / 132 260 / 130

75 (24) 265 / 133 285 / 139 284 / 132 302 / 140 280 / 134 276 / 134 280 / 132

80 (27) 292 / 135 307 / 140 307 / 134 325 / 142 301 / 136 298 / 134 299 / 134

85 (29) 314 / 136 329 / 141 330 / 135 349 / 142 327 / 137 323 / 135 321 / 135

90 (32) 338 / 137 354 / 142 355 / 136 375 / 143 353 / 138 350 / 137 344 / 134

95 (35) 362 / 138 379 / 143 380 / 137 404 / 144 377 / 140 377 / 138 371 / 135

100 (38) 388 / 140 404 / 144 407 / 138 433 / 145 404 / 141 406 / 140 400 / 137

105 (41) 415 / 141 438 / 145 434 / 139 462 / 147 435 / 142 430 / 141 428 / 139

110 (43) 444 / 142 464 / 147 465 / 141 494 / 149 465 / 143 464 / 142 458 / 141

115 (45) 475 / 143 495 / 148 497 / 142 527 / 150 499 / 144 495 / 143 484 / 142

°F(°C)2Fixed Orifice (RFC) - Liquid Line (+10 psig) / Vapor Line (+5 psig)

65 (18) 233 / 121 246 / 126 245 / 123 261 / 134 246 / 126 247 / 125 248 / 124

70 (21) 250 / 124 265 / 129 265 / 126 281 / 136 263 / 128 266 / 128 266 / 126

75 (24) 270 / 128 286 / 132 286 / 129 301 / 138 284 / 131 286 / 131 288 / 130

80 (27) 291 / 131 307 /135 308 / 132 324 / 140 305 / 133 307 / 133 309 / 133

85 (29) 313 / 134 330 / 137 331 / 135 346 / 142 327 / 135 329 / 135 330 / 135

90 (32) 335 / 136 353 / 140 355 / 138 371 / 144 350 / 138 353 / 138 354 / 138

95 (35) 359 / 138 378 / 142 380 / 140 396 / 146 374 / 140 377 / 140 377 / 140

100 (38) 383 / 140 402 / 143 405 / 142 422 / 148 399 / 142 403 / 142 406 / 142

105 (41) 409 / 142 428 / 145 431 / 144 448 / 150 424 / 144 428 / 144 431 / 144

110 (43) 436 / 145 456 / 147 458 / 146 477 / 151 452 / 146 455 / 146 457 / 146

115 (46) 464 / 147 486 / 149 487 / 148 506 / 153 481 / 148 483 / 147 484 / 148

Table 4. Approach (APP) Values3 - TXV System - ºF (ºC) +1ºF (0.5ºC)

All 4 (2.2) 8 (4.4) 8 (4.4) 11 (6.1) 9 (5.0) 8 (4.4) 9 (5.0)

Table 5. Subcooling (SC) Values4 - TXV System - ºF (ºC) +1ºF (0.5ºC)

All 10 (5.6) 10 (5.6) 9 (5.0) 12 (6.7) 9 (5.0) 9 (5.0) 7 (3.9)

1 Typical pressures; indoor evaporator match up, indoor air quantity, and evaporator load will cause

the pressures to vary.

2 Temperature of air entering outside coil.
3 Approach = Liquid Line Temp. minus Outdoor Ambient Temperature
4 Subcooling = Saturation Temp. minus Liquid Line Temp Temperature

*2P0709* *P580052-01*

07/09 580052-01

13ACX CHARGING INFORMATION

AIRFLOW CHECK - Both airflow and refrigerant charge must be monitored for a proper
system set‐up. It may be necessary to alternately check and adjust the airflow and the
refrigerant charge.

NOTE - Be sure that filters and indoor and outdoor coils are clean before testing.

To determine temperature drop across indoor coil (Delta-T), measure the entering air dry bulb
(DB) and wet bulb (WB) temperatures at the indoor coil. Find Delta-T in table 1.. Measure coil's
leaving air DB and subtract that value from entering air DB. The measured difference should
be within +

3ºF (+1.8ºC) of table value; if too low, decrease the indoor fan speed (refer to indoor
unit for information). If the Delta-T is too high, increase the indoor fan speed. Repeat charging
procedure and Delta-T (air flow adjustment) procedure until both are correct.

Example: assume entering air DB - 72, WB - 64, leaving DB - 53. Therefore, Delta-T should
be 15 (per table); delta across coil is 72 - 53 or 19 (which is 4ºF higher than table value); action
necessary: increase fan speed.

Table 1. Evaporator Coil Delta-T

Dry bulb 80 24 24 24 23 23 22 22 22 20 19 18 17 16 15
temperature 78 23 23 23 22 22 21 21 20 19 18 17 16 15 14
of air 76 22 22 22 21 21 20 19 19 18 17 16 15 14 13
entering 74 21 21 21 20 19 19 18 17 16 16 15 14 13 12
indoor 72 20 20 19 18 17 17 16 15 15 14 13 12 11 10
coil (ºF) 70 19 19 18 18 17 17 16 15 15 14 13 12 11 10

ºF 57 58 59 60 61 62 63 64 65 66 67 68 69 70

[ Wet bulb temperature of air entering indoor coil ]

Table 2. Superheat (SH) Value (RFC)

Suction line saturation temperature minus suction line temperature.

Outdoor

Temp (ºF)

65 70 75 80 85 90 95 100 105

Superheat

(ºF)

35 30 25 22 18 12 8 5 5

All measurements are at the service valves and are based on 80db / 67wb indoor temperature.

Table 3. RFC Sizes

Unit Size -18 -24 -30 -36 -42 -48 -60

RFC Size 0.053 0.057 0.063 0.072 0.074 0.082 0.090

Table 4. Normal Operating Pressures

1

Size -18 -24 -30 -36 -42 -48 -60

°F(°C)2Fixed Orifice (RFC) - Liquid Line (+10 psig) / Vapor Line (+5 psig)

65 (18) 233 / 121 246 / 126 245 / 123 261 / 134 246 / 126 247 / 125 248 / 124

70 (21) 250 / 124 265 / 129 265 / 126 281 / 136 263 / 128 266 / 128 266 / 126

75 (24) 270 / 128 286 / 132 286 / 129 301 / 138 284 / 131 286 / 131 288 / 130

80 (27) 291 / 131 307 /135 308 / 132 324 / 140 305 / 133 307 / 133 309 / 133

85 (29) 313 / 134 330 / 137 331 / 135 346 / 142 327 / 135 329 / 135 330 / 135

90 (32) 335 / 136 353 / 140 355 / 138 371 / 144 350 / 138 353 / 138 354 / 138

95 (35) 359 / 138 378 / 142 380 / 140 396 / 146 374 / 140 377 / 140 377 / 140

100 (38) 383 / 140 402 / 143 405 / 142 422 / 148 399 / 142 403 / 142 406 / 142

105 (41) 409 / 142 428 / 145 431 / 144 448 / 150 424 / 144 428 / 144 431 / 144

110 (43) 436 / 145 456 / 147 458 / 146 477 / 151 452 / 146 455 / 146 457 / 146

115 (46) 464 / 147 486 / 149 487 / 148 506 / 153 481 / 148 483 / 147 484 / 148

°F(°C)2TXV System - Liquid Line (+10 psig) / Vapor Line (+5 psig)

65 (18) 233 / 132 244 / 137 248 / 127 263 / 135 238 / 132 235 / 132 241 / 130

70 (21) 251 / 133 263 / 138 263 / 131 281 / 138 262 / 133 254 / 132 260 / 130

75 (24) 265 / 133 285 / 139 284 / 132 302 / 140 280 / 134 276 / 134 280 / 132

80 (27) 292 / 135 307 / 140 307 / 134 325 / 142 301 / 136 298 / 134 299 / 134

85 (29) 314 / 136 329 / 141 330 / 135 349 / 142 327 / 137 323 / 135 321 / 135

90 (32) 338 / 137 354 / 142 355 / 136 375 / 143 353 / 138 350 / 137 344 / 134

95 (35) 362 / 138 379 / 143 380 / 137 404 / 144 377 / 140 377 / 138 371 / 135

100 (38) 388 / 140 404 / 144 407 / 138 433 / 145 404 / 141 406 / 140 400 / 137

105 (41) 415 / 141 438 / 145 434 / 139 462 / 147 435 / 142 430 / 141 428 / 139

110 (43) 444 / 142 464 / 147 465 / 141 494 / 149 465 / 143 464 / 142 458 / 141

115 (45) 475 / 143 495 / 148 497 / 142 527 / 150 499 / 144 495 / 143 484 / 142

Table 5. Approach (APP) Values3 - TXV System - ºF (ºC) +1ºF (0.5ºC)

All 8 (4.4) 11 (6.1) 10 (5.5) 13 (7.2) 7 (3.9) 7 (3.9) 13 (7.2)

Table 6. Subcooling (SC) Values4 - TXV System - ºF (ºC) +1ºF (0.5ºC)

65 5 (2.8) 8 (4.4) 5 (2.8) 3 (1.7) 8 (4.4) 6 (3.3) 4 (2.2)

75 5 (2.8) 8 (4.4) 6 (3.3) 3 (1.7) 9 (5.0) 7 (3.9) 4 (2.2)

85 5 (2.8) 8 (4.4) 6 (3.3) 4 (2.2) 9 (5.0) 7 (3.9) 5 (2.8)

95 6 (3.3) 9 (5.0) 7 (3.9) 4 (2.2) 10 (5.5) 8 (4.4) 5 (2.8)

105 7 (3.9) 9 (5.0) 8 (4.4) 5 (2.8) 11 (6.1) 9 (5.0) 5 (2.8)

115 9 (5.0) 10 (5.5) 8 (4.4) 5 (2.8) 11 (6.1) 9 (5.0) 4 (2.2)

1 Typical pressures; indoor evaporator match up, indoor air quantity, and evaporator load will cause the

pressures to vary.

2 Temperature of air entering outside coil.
3 Approach = Liquid Line Temp. minus Outdoor Ambient Temperature
4 Subcooling = Saturation Temp. minus Liquid Line Temp Temperature

*2P52013* *P580450-01*

5/2013 580450-01

INDEX

B

Brazing Connections, Page 15

C

Charging Stickers, Page 33

Checklist, Page 25

Clearances, Page 11

Control Wiring, Page 23

D

Dimensions - Unit, Page 8 Disconnect Switch, Page 22

E

Electrica Data, Page 4

Electrical, Page 22

Disconnect Switch, Page 22
High Voltage Routing, Ground , Control, Page

23

Size Circuit, Page 22

Transformer - 24VAC, Page 22
Wire Length Run, Page 23

Equalizer Line, Page 19

Evacuating Line Set and Indoor Coil, Page 21

Expansion Valve - Indoor, Page 19

F

Filter Drier, Page 15 Flushing Line Set and Indoor Coil, Page 18

G

Gauge Port Seal Cap, Page 9 Gauge Set Pressure Rating, Page 9

I

Installation

Clearances, Page 11
Louvers, Page 12

Positioning Considerations, Page 11
Roof Mounting, Page 12
Slab Placement, Page 12

L

Leak Test, Page 20

Line Set, Page 13

Line Set Installation, Page 14

Horizontal Runs, Page 14
Transitions, Page 14

Vertical Runs, Page 14

Liquid Line Size, Page 13

Louvers, Page 12

Low Voltage Wiring, Page 23

38

M

Maintenance

Indoor Coil, Page 24
Indoor Unit, Page 24
Outdoor Coil, Page 24
Outdoor Unit, Page 24

P

Parts Arrangement, Page 9

POE Oils, Page 13

Pressure Switch (S4) - Automatic, Page 23

R

Refrigerant - Charge, Page 28

Approach TXV Charge Method, Page 31
Determing Charge Method, Page 30
Subcooling TXV Charge Method, Page 31

S

Sensing Blub, Page 19

Sequence of Operations, Page 26

Serial Number, Page 2

Service Caps, Page 9

Service Valves

Gauge Set, Page 9
Operating, Page 10

Metering Device Installation, Page 19

Equalizer Line, Page 19
Sensing Blub, Page 19

Model Number, Page 2

Pressure Switch (S4) - Manual, Page 23

Manual Reset, Page 23

Pressures - Temperature, Page 32

Superheat RFC Method, Page 32

Weigh-In Method, Page 30
RFCI, Page 13
Roof Mounting, Page 12

Torque Requirements, Page 9

Servicing Units Void of Charge, Page 28

Slab - Placement, Page 12

Specifications, Page 2

Start-up - Unit, Page 28

Suction Line Size, Page 13

T

Transformer - 24VAC, Page 22

W

Wire Gauge, Page 23

Wire Length Run, Page 23

Wiring Diagram

Build -01 through -10, Page 26

Build 11 or Later, Page 27

39