American Standard 21 Series Assembly instructions

Models :

4TXM2118A12N0A

4TXM2124A13N0A

4TXM2130A14N0A

4TXM2136A14N0A

4TXM2142A15N0A

Installer's Guide

Split System (R-410A)

21 Series Multi-Zone

Inverter System

18,000 Btu/h to 42,000 Btu/h

January 2023 MS-SVN085A-EN

WARNING

This equipment is to be serviced by professionally trained personnel

ONLY. Under NO circumstances should an unqualied person service it.

This equipment contains refrigerant under PRESSURE and operates at

HIGH VOLTAGE. Improperly installed, adjusted or altered equipment by an

unqualied person poses safety hazards including FIRE, ELECTROCUTION,

or EXPLOSION, which could result in death or serious injury.

Warnings and Cautions

Warnings are provided to alert others of the potential hazards that could

result in severe personal injury or death, while cautions are designed

to alert others of the conditions that could result in minor or moderate

injury.

Your personal safety and the proper operation of this machine depend

upon the strict observance of these precautions.

Attention: Warnings and Cautions appear at appropriate sections

throughout this literature. Read these carefully.

WARNING: Indicates a potentially hazardous situation which, if not

avoided, could result in death or serious injury.

CAUTION: Indicates a potentially hazardous situation which, if not

avoided, could result in minor or moderate injury. It may also be used

to alert against unsafe practices.

NOTICE:Indicates a situation that could result in equipment or

property damage.

WARNING

Electrocution and Fire Hazards with Improperly Installed and Grounded

Field Wiring!

Improperly installed and grounded eld wiring poses FIRE and

ELECTROCUTION hazards.To avoid these hazards, you MUST follow

requirements for eld wiring installation and grounding as described in

the National Electrical Codes (NEC) and your State and/or local electrical

codes. All eld wiring MUST be performed by qualied personnel.

Failure to follow these requirements could result in death or serious injury.

Warnings and Cautions

WARNING

R-410A Refrigerant under Higher Pressure than R-22!

The units described in this manual use R-410A refrigerant which operates at 50 to 70%

higher pressures than R-22. Use only R-410A approved service equipment. Refrigerant

cylinders may contain a "dip" tube to allow for charging of liquid refrigerant into the

system. For specic handling concerns with R-410A, please contact your local sales ofce.

Failure to use R-410A approved service equipment could result in standard equipment

exploding under R-410A higher pressure which could result in death or serious injury.

NOTICE

Use appropriate oil with R410A systems. Oil type is found at the bottom of Connection Pipe

Requirements table (included in the outdoor unit installation manual). R-410A systems

utilize POE (Polyolester) or PVE(Polyvinyl Ether) oil. Both oil types absorb moisture readily,

yet, lubrication properties vary. Do not leave the sealed system open to atmosphere except

during service for a short period of time. If the sealed system is left open longer than four

hours, the compressor oil must be changed.These systems utilize strainers placed before

and after the expansion device in the outdoor unit, if debris or moisture is suspected, these

strainers must be changed. Do not break a vacuum with air. Do not leak check the sealed

system with compressed air. Unless instructed by factory service representative, external

refrigeration driers are prohibited.

USE ONLY THE FACTORY RECOMMENDED OIL TYPE!

Important!

Environmental Concerns

Scientic research has shown that certain man-made chemicals can affect the earth's naturally occurring

stratospheric ozone layer when released to the atmosphere. In particular, several of the identied chemicals that

may affect the ozone layer are refrigerants that contain chlorouorocarbons (CFC's) and those containing hydro-

chlorouorocarbons (HCFC's). Not all refrigerants containing these compounds have the same potential impact

to the environment.The Company advocates the responsible handling of all refrigerants, including industry

replacements for CFC's such as HCFC's and HFC's.

Responsible Refrigerant Practices

The manufacturer believes that responsible refrigerant practices are important to the environment, our

customers, and the air conditioning industry. All technicians who handle refrigerants must be certied.The

Federal Clean Air Act (Section 608) sets forth the requirements for handling, reclaiming, recovering and recycling

of certain refrigerants and the equipment that is used in these service procedures. In addition, some states or

municipalities may have additional requirements that must also be adhered to for responsible management of

refrigerants. Know the applicable laws and follow them.

Contents

Safety Precautions ...............................................................................................5

Pre-Installation Checklist .....................................................................................6

Product Introduction .............................................................................................7

Ductless Multi-Split Approved Combinations........................................................8

Operating Temperature Ranges ...........................................................................9

Preparation for Installation..................................................................................10

Selecting the Installation Location......................................................................10

Installing the Outdoor Unit.................................................................................. 11

Condensate Management of the Outdoor Unit................................................... 11

Refrigerant Piping Between the Indoor and Outdoor Units ................................ 11

Refrigeration and Condensate Piping Tips .........................................................13

Connection Pipe Requirements..........................................................................14

Refrigerant Piping Precautions...........................................................................14

Nitrogen Purging While Brazing .........................................................................14

Installing the Refrigerant Piping..........................................................................16

Insulating the Refrigeration Piping and Connections .........................................16

Refrigerant Piping Between the Indoor and Outdoor Units ................................17

Vacuum and Refrigerant Leakage Detection......................................................19

Wiring Precautions .............................................................................................20

Outdoor Wiring Connections ..............................................................................20

Stranded Wiring Connections.............................................................................21

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

Post Installation Checklist ..................................................................................22

Refrigerant System Diagrams ............................................................................24

Electrical Connections at the Outdoor Unit.........................................................25

Wiring Diagrams.................................................................................................26

Dimensional Diagrams .......................................................................................29

Troubleshooting..................................................................................................31

Error Codes ........................................................................................................32

Maintenance.......................................................................................................33

List of Resistance for Temperature Sensor ........................................................34

Parts Replacement.............................................................................................37

After-Sales Service.............................................................................................37

MS-SVN085A-EN

21 Series Multi-Split

WARNING This mark indicates a potentially hazardous situation which, if not avoided,

could result in death or serious injury.

CAUTION

This mark indicates a potentially hazardous situation which, if not avoided,

could result in minor or moderate injury. It may also be used to alert against

unsafe practices.

NOTICE This mark indicates a situation which could result in equipment and/or

property damage.

Safety Precautions

Your personal safety and the proper operation of this equipment depend upon the strict observance of

these precautions.

WARNING

1. Installation should performed by a qualied HVAC professional. Industry Standard Personal

Protective Equipment (PPE) and gear for height related safety should be worn during installation.

Improper personal safety precautions and installation may cause death or serious injury.

2. Install the air conditioner according to the instructions given in this manual. Incomplete installation

work may cause water leakage, electrical shock or re.

3. Use the supplied or specied installation parts. Use of other parts may cause the unit to come

loose, resulting in water leakage, electrical shock or re.

4. Install the unit in a location that can support the weight of the unit. An inadequate support

structure or incomplete installation may cause injury or property damage in the event the unit falls

o󰀨 of the installation location. Refer to the installation specications for additional requirements.

5. Electrical work should be carried out in accordance with the installation manual and local, state

and National Electric Code (NEC). Insu󰀩cient capacity or incomplete electrical work may cause

electrical shock or re.

6. Use a dedicated power circuit. Never use a power supply shared by another appliance.

7. For wiring, use a cable that is long enough to cover the entire distance without splicing. Do not

use an extension cord. Do not put other loads on the power supply; use a dedicated power circuit.

Failure to do so may cause abnormal heat, electric shock or re.

8. Use the specied types of wires for electrical connections between the indoor and outdoor units.

Firmly clamp the interconnecting wires so their terminals receive no external stresses. Incomplete

connections or clamping may cause terminal overheating or re.

9. After joining the interconnecting and supply wiring, shape the cables so that they do not put undue

force on the electrical covers or panels. Install covers over the wires. Incomplete cover installation

may cause terminal overheating, electrical shock, or re.

10. If any refrigerant leaks out during the installation, ventilate the room. The refrigerant produces a

toxic gas if exposed to ames.

11. When installing or relocating the system, keep the refrigerant circuit free from substances

other than the specied refrigerant (R-410A), such as air. The presence of air or other foreign

substances in the refrigerant circuit can cause an abnormal pressure rise or rupture, which could

result in injury and damage.

MS-SVN085A-EN 6

21 Series Multi-Split

12. If a system pump-down is performed, turn o󰀨 the associated equipment and close service valves

prior to removing the refrigerant piping. Failure to do so will introduce non-condensables in the

system, causing abnormal pressure in the refrigeration cycle which could lead to injury and

damage.

13. Before system start-up, attach the refrigerant piping securely. Failure to do so will introduce non-

condensables into the system when the compressor is running, causing abnormal pressure in the

refrigeration cycle which could lead to injury and damage.

14. Establish a complete ground. Do not ground the unit to a utility pipe, arrester, or telephone

ground. An incomplete ground may cause electrical shock, or re. A high surge current from

lightning or other sources may cause damage to the air conditioner.

15. If the power supply cable is damaged, it must be replaced by the manufacturer, its service agent

or another qualied professional in order to avoid electrical risk during and after replacement.

Pre-Installation Checklist

1. Unpack and inspect each unit.

2. Check for any damage to the unit.

3. Check the model numbers to ensure a proper match.

4. Check the unit nameplate to ensure the proper electrical requirements will be met.

5. Check the installation locations to ensure the weight of the units can be supported.

6. Check the refrigerant pipe sizes and ensure they have been or will be installed according to the

requirements in this manual.

7. Check the outdoor unit nameplate for electrical power supply and wiring requirements to ensure the

proper wiring has been installed prior to connection.

8. Check the indoor unit for coil leakage. The pressure relief valve on the gas pipe should release

pressurized nitrogen which ensures the unit has not leaked during shipping.

CAUTION

1. Do not install the unit in a place where there is danger of exposure to ammable gas leakage. If

gas leaks and builds up around the unit, it may result in re.

2. After system installation is completed, make sure no refrigerant leakage is present.

3. This appliance is not intended for use by persons with a lack of experience and knowledge, unless

they have been given adequate supervision or instruction concerning use of the appliance by a

person responsible for their safety.

4. Children should be supervised to ensure that they do not play with the appliance.

NOTICE

1. Establish drain piping according to the instructions in this manual. Inadequate piping may cause

ooding.

2. Tighten the are nut according to the specied method. If the are nut is tightened too hard, the

are nut may crack and cause refrigerant leakage.

MS-SVN085A-EN

Product Introduction

The 21 Series Multi-split system utilizes inverter compressor technology, which enables the outdoor unit to

send refrigerant to multiple indoor units of varying capacities. It is critical, however, that heat loss and heat

gain calculations be performed to properly size the multi-split system.

Table 1: OD Unit Component Identication

Table 2: Number of Indoor Units

Note: When the total capacity of the indoor units exceeds the total capacity of the outdoor unit, the system

will be restricted by the capacity of the outdoor unit. All indoor units would not be able to operate at full

capacity at the same time. If the indoor unit combined capacity is less than 100% of the outdoor units'

capacity, the system capacity is limited to the indoor unit(s) combined capacity.

MODEL 4TXM2118A12 4TXM2124A13 4TXM2130A14 4TXM2136A14 4TXM2142A15

Minimum number of connectable indoor

units 2 2 2 2 2

Maximum number of connectable

indoor units 2 3 4 4 5

No. 1 2 3 4 5

Name Motor Fan Electric Box Vapor Valve Assembly Liquid Valve Assembly

21 Series Multi-Split

MS-SVN085A-EN

Table 3: Ductless Multi-Split Approved Combinations

Indoor Unit Combinations

Outdoor Unit Two Units

4TXM2118A12N0A

18,000 BTUH

9 + 9 12+12

9 + 12

Outdoor Unit Two Units Three Units

4TXM2124A13N0A

24,000 BTUH

9+9 9+12 9+9+9 9+12+12 12+12+12

9+18 12+12 9+9+12 9+9+18

12+18 18+18

Outdoor Unit One Indoor Two Indoor Three Indoor Four Indoor Five Indoor

4TXM2130A14N0A

30,000 BTUH

9K+9K 9K+9K+9K 9K+9K+9K+9K

9K+12K 9K+9K+12K 9K+9K+9K+12K

9K+18K 9K+9K+18K 9K+9K+9K+18K

9K+24K 9K+9K+24K 9K+9K+12K+12K

12K+12K 9K+12K+12K 9K+12K+12K+12K

12K+18K 9K+12K+18K

12K+24K 9K+12K+24K

18K+18K 9K+18K+18K

18K+24K 12K+12K+12K

12K+12K+18K

Outdoor Unit One Indoor Two Indoor Three Indoor Four Indoor Five Indoor

4TXM2136A14N0A

36,000 BTUH

9K+9K 9K+9K+9K 9K+9K+9K+9K

9K+12K 9K+9K+12K 9K+9K+9K+12K

9K+18K 9K+9K+18K 9K+9K+9K+18K

9K+24K 9K+9K+24K 9K+9K+9K+24K

12K+12K 9K+12K+12K 9K+9K+12K+12K

12K+18K 9K+12K+18K 9K+9K+12K+18K

12K+24K 9K+12K+24K 9K+9K+12K+24K

18K+18K 9K+18K+18K 9K+9K+18K+18K

18K+24K 9K+18K+24K 9K+12K+12K+12K

24K+24K 12K+12K+12K 9K+12K+12K+18K

12K+12K+18K 12K+12K+12K+12K

12K+12K+24K 12K+12K+12K+18K

12K+18K+18K

12K+18K+24K

18K+18K+18K

Outdoor Unit One Indoor Two Indoor Three Indoor Four Indoor Five Indoor

4TXM2142A15N0A

42,000 BTUH

9K+12K 9K+9K+9K 9K+9K+9K+9K 9K+9K+9K+9K+9K

9K+18K 9K+9K+12K 9K+9K+9K+12K 9K+9K+9K+9K+12K

9K+24K 9K+9K+18K 9K+9K+9K+18K 9K+9K+9K+9K+18K

12K+12K 9K+9K+24K 9K+9K+9K+24K 9K+9K+9K+9K+24K

12K+18K 9K+12K+12K 9K+9K+12K+12K 9K+9K+9K+12K+12K

12K+24K 9K+12K+18K 9K+9K+12K+18K 9K+9K+9K+12K+18K

18K+18K 9K+12K+24K 9K+9K+12K+24K 9K+9K+9K+12K+24K

18K+24K 9K+18K+18K 9K+9K+18K+18K 9K+9K+9K+18K+18K

24K+24K 9K+18K+24K 9K+9K+18K+24K 9K+9K+12K+12K+12K

9K+24K+24K 9K+12K+12K+12K 9K+9K+12K+12K+18K

12K+12K+12K 9K+12K+12K+18K 9K+12K+12K+12K+12K

12K+12K+18K 9K+12K+12K+24K 9K+12K+12K+12K+18K

12K+12K+24K 9K+12K+18K+18K 12K+12K+12K+12K+12K

12K+18K+18K 9K+12K+18K+24K

12K+18K+24K 9K+18K+18K+18K

12K+21K+24K 12K+12K+12K+12K

12K+24K+24K 12K+12K+12K+18K

18K+18K+18K 12K+12K+12K+24K

18K+18K+24K 12K+12K+18K+18K

Note: Heating and cooling capacity capacity can be diminished with more that 100% indoor connected load.

21 Series Multi-Split

MS-SVN085A-EN

The gure below illustrates that multiple indoor high wall units may be used on a single 4TXM21 multi-port

system, provided the combination is approved. Please reference the multi-zone approved combinations

matrix on page 8.

When the total capacity of the indoor units exceeds the total capacity of the outdoor unit, the system will be

restricted by the capacity of the outdoor unit. All indoor units would not be able to operate at full capacity

at the same time. If the indoor unit combined capacity is less than 100% of the outdoor units' capacity, the

system capacity is limited to the indoor unit(s) combined capacity.

Note: Please see the product data information for total cooling capacities down to 0 degrees F.

Table 5: Operating Temperature Ranges

Cooling Operating Range Outdoor Temperature -22 - 118 °F (-30 - 48 °C)

Heating Operating Range Outdoor Temperature -22 - 75 °F (-30 - 24 °C)

Combinations for Outdoor and Indoor Units

Table 4: Ductless Multi-Split Quick Reference

Multi-Split Heat Pump Outdoor

18,000 BTUH 24,000 BTUH 30,000 BTUH 36,000 BTUH 42,000 BTUH

4TXM2118A12N0A 4TXM2124A13N0A 4TXM2130A14N0A 4TXM2136A14N0A 4TXM2142A15N0A

Maximum number of 2 indoor units in any unit type combination for 4TXM2118

Maximum number of 3 indoor units in any unit type combination for 4TXM2124

Maximum number of 4 indoor units in any unit type combination for 4TXM2130

Maximum number of 4 indoor units in any unit type combination for 4TXM2136

Maximum number of 5 indoor units in any unit type combination for 4TXM2142

Wall Mounted

Indoor Unit

Wall Mounted

Indoor Unit

Wall Mounted

Indoor Unit

Wall Mounted

Indoor Unit

Wall Mounted

Indoor Unit

21 Series Multi-Split

MS-SVN085A-EN

Preparation for Installation

valve cover

Space to the wall

12 in. or more

20 in. or more

12 in. or more

or more.ni

Space to the obstruction

Air outlet side

Space to the wall

Air inlet side

Outdoor Unit

1. Select a location where equipment noise and air discharge won't be distracting.

2. Select a location where there is sufcient ventilation.

3. Make sure the air inlet and outlet are not blocked by any obstacles

4. Select a location capable of supporting four times the weight of the unit, that will not increase

vibration, and where installation work can be carried out safely.

5. Select a location away from ammable gas or gas leaks.

6. Ensure installation of the outdoor unit conforms to the clearance specications in this manual.

7. Locate the outdoor unit away from any bedroom windows.

NOTICE

Installing the unit in one of the following locations could result in unit malfunction:

1. Places where oil (machine oil) is used.

2. Seaside places with high levels of salt in the air.

3. Places with high levels of sulphur gas such as areas with hot springs.

4. Places where high-frequency waves are generated by radio equipment, welders and medical

equipment.

5. Other unusual places where unit operation may be altered.

6. Places where minimum clearances cannot be met.

WARNING

1. Install the unit on a level surface or on supports that are level.

2. If the location is subject to strong winds, the additional force must be accounted for

and the unit must be xed securely to the base. Refer to local codes for additional

requirements.

Selecting the Installation Location

21 Series Multi-Split

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