American Standard 4A7A3 User Manual

11-AC29D1-10C-EN
ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES
IMPORTANT — This Document is customer property and is to remain with this unit. Please return to service informa-
tion pack upon completion of work.
Condensing Units
These instructions do not cover all variations in systems or provide for every possible contingency to be met in connection with
the installation. 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.
Note: The manufacturer recommends installing only approved matched indoor and outdoor systems. Some of the benefits of
installing approved matched indoor and outdoor split systems are maximum efficiency, optimum performance and the best overall
system reliability.
4A7A3
Table of Contents
Section 1. Safety ..................................................................................... 2
Section 2. Unit Location Considerations ............................................. 3
Section 3. Unit Preparation .................................................................... 5
Section 4. Setting the Unit ..................................................................... 5
Section 5. Refrigerant Line Considerations ......................................... 6
Section 6. Refrigerant Line Routing ..................................................... 8
Section 7. Refrigerant Line Brazing ...................................................... 9
Section 8. Refrigerant Line Leak Check ............................................. 11
Section 9. Evacuation .......................................................................... 12
Section 10. Service Valves .................................................................. 12
Section 11. Electrical - Low Voltage ................................................... 13
Section 12. Electrical - High Voltage .................................................. 15
Section 13. Start Up .............................................................................. 16
Section 14. System Charge Adjustment ............................................. 17
Section 15. Checkout Procedures ...................................................... 23
Section 16. Refrigerant Circuits .......................................................... 24
Section 17. Wiring Diagrams ............................................................... 26
Section 18. Pressure Curves ............................................................... 34
Installation and Operation Manual

American Standard 4A7A3 Specifications

General

Brand	American Standard
Model	4A7A3
Category	Heat Pump
Language	English

Summary

Section 1. Safety

General Safety Precautions

Crucial safety information for installation, operation, and servicing of the unit.

R-410A Refrigerant Handling

Specific guidelines for handling R-410A refrigerant and associated oils.

Section 2. Unit Location Considerations

Unit Dimensions and Weight

Details on unit size, weight, and mounting requirements for proper installation.

Refrigerant Piping Limits

Guidelines for maximum total length and vertical change of refrigerant lines.

Suggested Locations for Best Reliability

Recommendations for unit placement to ensure optimal performance and avoid issues.

Cold Climate Considerations

Precautions for installing units in areas with snow and freezing temperatures.

Coastal Considerations

Specific requirements for installing units near salt water environments.

Section 3. Unit Preparation

Prepare The Unit For Installation

Steps to inspect and prepare the unit before installation.

Section 4. Setting the Unit

Pad Installation

Guidelines for installing the support pad for the outdoor unit.

Section 5. Refrigerant Line Considerations

Refrigerant Line and Service Valve Connection Sizes

Table detailing line sizes and connection types for various models.

Factory Charge

Information about the factory refrigerant charge and verification methods.

Required Refrigerant Line Length

How to determine and record the required refrigerant line length and lift.

Refrigerant Line Insulation

Critical instructions on insulating the vapor line and preventing contact.

Reuse Existing Refrigerant Lines

Precautions when using existing refrigerant lines for retrofit applications.

Section 6. Refrigerant Line Routing

Precautions

Guidelines to prevent noise and ensure proper routing of refrigerant lines within the structure.

Section 7. Refrigerant Line Brazing

Braze The Refrigerant Lines

Step-by-step instructions for brazing refrigerant lines using dry nitrogen.

Section 8. Refrigerant Line Leak Check

Check For Leaks

Procedure for leak checking refrigerant lines and coil using dry nitrogen and soapy solution.

Section 9. Evacuation

Evacuate the Refrigerant Lines and Indoor Coil

Steps to evacuate the system to the required micron level.

Section 10. Service Valves

Open the Gas Service Valve

Instructions for properly opening the gas service valve on the unit.

Open the Liquid Service Valve

Cautionary steps for opening the liquid line service valve safely.

Section 11. Electrical - Low Voltage

Low Voltage Maximum Wire Length

Table specifying maximum wire lengths for low voltage thermostat wiring.

Low Voltage Hook-up Diagrams

Wiring diagrams for connecting the thermostat to air handler and outdoor unit.

Section 12. Electrical - High Voltage

High Voltage Power Supply

Requirements for the high voltage power supply and compliance with codes.

High Voltage Disconnect Switch

Recommendation for installing a separate disconnect switch at the outdoor unit.

High Voltage Ground

Procedure for grounding the outdoor unit according to codes.

Section 13. Start Up

System Start Up

Steps for safely powering up and starting the system after installation.

Section 14. System Charge Adjustment

Temperature Measurements

How to measure temperatures for system charging and select the correct method.

Subcooling Charging in Cooling

Detailed procedure for subcooling charge adjustment in cooling mode.

Subcooling Charging Chart Corrections

Charts for determining subcooling corrections based on line length and lift.

R-410A Refrigerant Charging Chart

Table for determining liquid gauge pressure based on subcooling and temp.

Fixed Orifice Superheat Charging Table

Table for superheat charging of fixed orifice systems using temperature measurements.

Subcooling Charging Below 55° F Outdoor Temp.

Recommended charging method for temperatures below 55°F, focusing on weigh-in.

Section 15. Checkout Procedures

Operational And Checkout Procedures

Final inspection and operational checks to ensure proper system performance.

Section 18. Pressure Curves

Cooling Performance Verification

How to use pressure curves to verify cooling performance based on temperature measurements.