American Standard 4A7A6024

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Since the manufacturer has a policy of continuous product

and product data improvement, it reserves the right to

change design and specifications without notice.

11-AC16D1-3

IMPORTANT — This Document is customer property and is to remain with this unit. Please return to service information pack

upon completion of work.

These instructions do not cover all variations in systems

nor provide for every possible contingency to be met in

connection with installation. All phases of this installa-

tion must comply with NATIONAL, STATE AND LOCAL

CODES. Should further information be desired or should

particular problems arise which are not covered sufficiently for

the purchaser’s purposes, the matter should be referred to your

installing dealer or local distributor.

A. GENERAL

The following instructions cover 4A7A6 Condensing Units. See

special wiring and sequence of operation on page 5.

NOTICE: These outdoor units may be used with indoor

units equipped with Thermostatic Expansion Valve only.

▲ WARNIN

These units use R-410A refrig-

erant which operates at 50% to 70% higher pressures than

R-22. Use only R-410A approved service equipment. Re-

frigerant cylinders are painted a “Rose” color to indicate

the type of refrigerant and may contain a “dip” tube to

allow for charging of liquid refrigerant into the system.

All R-410A systems use a POE oil that readily absorbs

moisture from the atmosphere. To limit this “hygroscopic”

action, the system should remain sealed whenever pos-

sible. Never break a vacuum with air and

always change

the driers when opening the system for component

replacement.

Check for transportation damage after unit is uncrated. Report

promptly, to the carrier, any damage found to the unit.

To determine the electrical power requirements of the unit, refer

to the nameplate of the unit. The electrical power available must

agree with that listed on the nameplate.

B. LOCATION & PREPARATION OF THE UNIT

1. When removing unit from the pallet, notice the tabs on the

basepan. Remove tabs by cutting with a sharp tool as shown in

Figure 2 (see page 2).

2. The unit should be set on a level support pad at least as large

as the unit base pan, such as a concrete slab. If this is not the

application used please refer to application bulletin

“ALG16-APG**-EN” (* denotes latest revision).

3. The support pad must NOT be in direct contact with any

structure. Unit must be positioned a minimum of 12" from any

wall or surrounding shrubbery to insure adequate airflow. Clear-

Condensing Units

Models:

4A7A6024,36,48, & 60B1000A

CAUTION

UNIT CONTAINS R-410A REFRIGERANT!

R-410A OPERATING PRESSURE EXCEEDS THE

LIMIT OF R-22. PROPER SERVICE EQUIPMENT IS

REQUIRED. FAILURE TO USE PROPER SERVICE

TOOLS MAY RESULT IN EQUIPMENT DAMAGE OR

PERSONAL INJURY.

SERVICE

USE ONLY R-410A REFRIGERANT AND

APPROVED POE COMPRESSOR OIL.

INSTALLER'S GUIDE

ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES

TOP DISCHARGE — UNRESTRICTED

5 FT. ABOVE UNIT

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Summary

Condensing Unit Installation Procedures

General Installation Guidelines

Covers general instructions and notices for installing 4A7A6 condensing units, including R-410A refrigerant precautions.

Unit Location and Preparation

Details requirements for unit placement, support pads, clearance from structures, and airflow.

Installing Refrigerant Lines

Provides guidance on routing, bending, securing, and insulating refrigerant tubing for installation.

Service Valve Operation

Explains the operation of brass liquid line service valves and warnings for R-410A systems.

Refrigerant System Handling and Evacuation

Brazing Refrigerant Lines

Instructions for brazing refrigerant lines, including precautions for valve cores and basepans.

Leak Check

Procedure for leak checking refrigerant lines and connections using nitrogen pressure.

System Evacuation

Steps for evacuating the refrigerant system to a specific micron level and charging with R-410A.

Electrical Connections and System Components

Electrical Connections

Guidelines for power wiring, grounding, disconnect switches, and low voltage wiring.

Electric Heaters

Instructions for installing electric heaters in the air handling device.

Start Control

Information on factory-installed or field-installed quick start components.

Outdoor Thermostat

Details on field installation of the TAYSTAT250A outdoor thermostat.

Seacoast Salt Shield

Note on the salt shield included with 4A7A6 models and its purpose.

Troubleshooting

A chart for diagnosing system faults related to refrigerant and electrical components.

Technical Drawings and Diagrams

Field Hook-Up Diagrams

Wiring diagrams for connecting 4A7A6 models to variable speed air handlers and furnaces.

Outline Drawing

Dimensional drawing of the 4A7A6 condensing unit with component locations and table of dimensions.

Mounting Hole Location

Detailed dimensions for mounting hole locations on the unit base.

System Checkout and Operation

Checkout Procedure

A checklist for verifying proper installation and operation of the entire HVAC system.

Summary

Condensing Unit Installation Procedures

General Installation Guidelines

Covers general instructions and notices for installing 4A7A6 condensing units, including R-410A refrigerant precautions.

Unit Location and Preparation

Details requirements for unit placement, support pads, clearance from structures, and airflow.

Installing Refrigerant Lines

Provides guidance on routing, bending, securing, and insulating refrigerant tubing for installation.

Service Valve Operation

Explains the operation of brass liquid line service valves and warnings for R-410A systems.

Refrigerant System Handling and Evacuation

Brazing Refrigerant Lines

Instructions for brazing refrigerant lines, including precautions for valve cores and basepans.

Leak Check

Procedure for leak checking refrigerant lines and connections using nitrogen pressure.

System Evacuation

Steps for evacuating the refrigerant system to a specific micron level and charging with R-410A.

Electrical Connections and System Components

Electrical Connections

Guidelines for power wiring, grounding, disconnect switches, and low voltage wiring.

Electric Heaters

Instructions for installing electric heaters in the air handling device.

Start Control

Information on factory-installed or field-installed quick start components.

Outdoor Thermostat

Details on field installation of the TAYSTAT250A outdoor thermostat.

Seacoast Salt Shield

Note on the salt shield included with 4A7A6 models and its purpose.

Troubleshooting

A chart for diagnosing system faults related to refrigerant and electrical components.

Technical Drawings and Diagrams

Field Hook-Up Diagrams

Wiring diagrams for connecting 4A7A6 models to variable speed air handlers and furnaces.

Outline Drawing

Dimensional drawing of the 4A7A6 condensing unit with component locations and table of dimensions.

Mounting Hole Location

Detailed dimensions for mounting hole locations on the unit base.

System Checkout and Operation

Checkout Procedure

A checklist for verifying proper installation and operation of the entire HVAC system.

This document is an installer's guide for American Standard 4A7A6024,36,48, & 60B1000A series condensing units, identified as model 11-AC16D1-3. It provides comprehensive instructions for installation, operation, and maintenance, emphasizing compliance with national, state, and local codes. The guide is intended to remain with the unit as customer property and for service information.

Function Description:

The 4A7A6 series condensing units are designed for use in air conditioning systems, specifically with indoor units equipped with Thermostatic Expansion Valves (TXV). These units utilize R-410A refrigerant, which operates at higher pressures than R-22. The system's primary function is to facilitate the heat exchange process, working in conjunction with an indoor coil or air handler to provide cooling. The units are factory charged with refrigerant for a 15-foot connecting line.

Important Technical Specifications:

Refrigerant Type: R-410A. This refrigerant operates at 50% to 70% higher pressures than R-22, necessitating the use of R-410A approved service equipment. POE oil is used, which is hygroscopic, requiring the system to remain sealed whenever possible and driers to be changed when opened.
Electrical Power Requirements: Determined by the unit's nameplate. The available electrical power must match the nameplate specifications.
Refrigerant Line Length: Maximum eighty (80) feet from outdoor to indoor unit.
Refrigerant Line Lift:
- Maximum twenty-five (25) feet (suction line) if the outdoor unit is mounted above the air handler.
- Maximum twenty-five (25) feet (liquid line) if the air handler is mounted above the condensing unit.
Clearances:
- Minimum 12 inches (305 mm) from any wall or surrounding shrubbery for adequate airflow.
- Top discharge area must be unrestricted for at least five (5) feet (1524 mm) above the unit.
- Adequate clearance in front of the control box (access panels) and other sides requiring service access is required to meet National Electrical Code.
Low Voltage Wiring:
- 18 AWG: Max. 150 ft (45.7 m)
- 16 AWG: Max. 225 ft (68.6 m)
- 14 AWG: Max. 300 ft (91.4 m)
Service Valves:
- Liquid Line Service Valve: Brass, factory-shipped in the seated position. Not a back-seating valve. Requires a 3/16" Allen wrench for opening.
- Gas Line Service Valve: Brass, factory-shipped in the closed position. Full open with a 1/4 turn. Requires a 1/4" open-end or adjustable wrench for opening.
Basepan Sizes:
- Base 3 (for 4A7A6024B): 933 mm (36-3/4 in) A, 829 mm (32-5/8 in) B, 756 mm (29-3/4 in) C.
- Base 4 (for 4A7A6036B, 4A7A6048B, 4A7A6060B): 841 mm (33-1/8 in) A, 946 mm (37-1/4 in) B, 870 mm (34-1/4 in) C.
- Common dimensions across models: D (Gas Line) 5/8, 3/4, 7/8 in; E (Liquid Line) 5/16, 3/8 in; F 143, 152 mm; G 92, 98 mm; H 210, 219 mm; J 79, 86 mm; K 508 mm.

Usage Features:

Installation Flexibility: Units can be set on a level support pad, such as a concrete slab. Specific application bulletins (ALG16-APG**-EN) may be referenced for non-standard applications.
Noise Reduction: Flexible electrical conduit should be used to prevent vibration transmission. Refrigerant lines should be fastened with isolation-type hangers and insulated where they pass through walls or enclosed ceilings.
Thermostat Compatibility: Designed for use with an indoor thermostat. An optional outdoor thermostat (TAYSTAT250A) can be field installed.
Start Control: Some models include factory-installed quick start components. For others, a field-installed start kit accessory can be added.
Seacoast Salt Shield: 4A7A6 models are shipped with a black Seacoast Salt Shield, which should not be removed as it can shorten the life of the outdoor coil joints.
Two-Stage Operation (4A7A6 models):
- 80% airflow with "Y1" (first stage).
- 100% airflow with "Y2" (second stage).
- Specific wiring instructions are provided for variable speed air handlers and furnaces, including jumper settings for "R" to "O" and cutting/removing the "BK" jumper.

Maintenance Features:

Leak Check: After brazing, all field connections must be checked for leaks by pressurizing with dry nitrogen to 300 psi and using soap bubbles.
System Evacuation: The refrigerant lines and indoor coil must be evacuated to no higher than 350 microns. The system is considered properly evacuated if the micron gauge does not rise above 500 microns in one minute after closing the valve to the vacuum pump.
Refrigerant Charging: Initial charge is factory set for 15 feet of line. Final charge adjustment is necessary and should be done according to the Charging Charts in the outdoor unit Service Facts. R-410A refrigerant must be charged as a liquid into the system. DO NOT VENT REFRIGERANT INTO THE ATMOSPHERE.
Brazing Precautions:
- Remove pressure tap port valve core and wrap a wet rag around the valve body to prevent heat damage during brazing.
- Use a Dry Nitrogen Purge and Brazing Alloy without flux.
- Keep the flame directly off the basepan to prevent heat damage.
Compressor Start-up: After electrical wiring, set the thermostat system switch to OFF and apply power for one hour to activate the compressor sump heat (where used). This prevents potential compressor overload trips during initial start-up.
Troubleshooting Chart: A detailed chart is provided to assist in diagnosing system faults, covering refrigerant circuit issues, electrical problems, and component failures. It identifies primary and secondary causes for various symptoms.
Checkout Procedure: A comprehensive checklist and procedure are provided to ensure proper installation and operation, including verifying refrigerant lines, electrical connections, fan operation, drain line function, and thermostat accuracy. The procedure includes steps for checking sump heat, indoor fan, cooling operation, and heating (if applicable).