American Standard 4A7A5 - User Manual

© 2007 American Standard Inc. All Rights Reserved
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-AC24D1-1
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
▲ WARNIN
G
:
This information is intended
for use by individuals possessing adequate backgrounds
of electrical and mechanical experience. Any attempt to
repair a central air conditioning product may result in
personal injury and or property damage. The manufac-
turer or seller cannot be responsible for the interpreta-
tion of this information, nor can it assume any liability in
connection with its use.
NOTE: AMERICAN STANDARD HAS ALWAYS RECOM-
MENDED INSTALLING AMERICAN STANDARD AP-
PROVED MATCHED INDOOR AND OUTDOOR SYSTEMS.
THE BENEFITS OF INSTALLING APPROVED MATCHED
SYSTEMS ARE MAXIMUM EFFICIENCY, OPTIMUM PER-
FORMANCE AND BEST OVERALL SYSTEM RELIABILITY.
▲ WARNIN
G
:
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. If a system has been open to the atmosphere for
more than 4 hours, the compressor oil must be replaced.
Never break a vacuum with air and
always change the
driers when opening the system for component replace-
ment. For specific handling concerns with R-410A and
POE oil, reference Retrofit Bulletin APB2001-01.
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 AND 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 on
page 2, Figure 2, and slide unit off of pallet.
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.
Condensing Units
INSTALLER'S GUIDE
ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES
5 FT. ABOVE UNIT — UNRESTRICTED
1
Models:
4A7A5
IMPORTANT — This Document is customer property and is to remain with this unit. Please return to service information pack
upon completion of work.
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.

Summary

General Installation Information

General Safety Warning

Information intended for experienced individuals; improper repair may cause injury or damage.

R-410 A Refrigerant Handling Warning

Warning about R-410A refrigerant, higher pressures, POE oil, and moisture sensitivity.

Installing Refrigerant Lines

Refrigerant Line Brazing Caution

Factory Refrigerant Charge and Adjustment

Service Valve Operation

Service Valve Operation Warning

Warning about exercising extreme caution when opening service valves to prevent system charge release.

Refrigerant Line Brazing

Brazing Preparation and Precautions

Steps for preparing and executing brazing, including cleaning, minimizing bends, and heat protection.

Dry Nitrogen Purge and Brazing

Procedure for using dry nitrogen purge and fluxless brazing alloy for connections.

Leak Check and System Evacuation

Leak Check Procedure

Instructions for pressurizing lines with dry nitrogen and checking for leaks using soap bubbles.

System Evacuation Procedure

Steps for evacuating the refrigerant lines and indoor coil to a specific micron level.

Vent Refrigerant Warning

Critical warning against venting refrigerant into the atmosphere.

Electrical Connections and Start-Up

Electrical Connection Safety

Warning to exercise basic safety precautions to avoid electric shock during installation and servicing.

Compressor Start-Up Procedure

Operational and Checkout Procedures

Troubleshooting

Troubleshooting Chart

A chart indicating primary and secondary causes for various system faults.

Wiring Diagrams

Subcooling Charging Method

Subcooling Charging for 55°F+ OD Ambient

Explains subcooling as the recommended charging method for cooling mode above 55°F ambient.

Charging Procedure Steps

Detailed steps for performing subcooling charging, including measuring temperatures, pressures, and line length.

R-410 A Refrigerant Charging Chart

A chart providing design subcooling values based on liquid temperature and pressure for R-410A systems.

Subcooling Charging Corrections

Outline Drawing and Dimensions

Checkout Procedure

Post-Installation Checkout List

A comprehensive checklist of items to verify after the installation is completed for proper operation.

American Standard 4A7A5 Specifications

General

Brand	American Standard
Model	4A7A5
Category	Heat Pump
Language	English