Trane A4AC4018A1000A - User Manual

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Summary

Section 2. Unit Location Considerations

2.1 Unit Dimensions and Weight

Table 2.1 lists unit dimensions and weight, essential for placement planning.

2.2 Refrigerant Piping Limits

Details maximum refrigerant line length and vertical change for optimal system performance.

2.3 Suggested Locations for Best Reliability

Provides guidance on unit placement to ensure adequate airflow and minimize noise.

Section 3. Unit Preparation

3.1 Prepare The Unit For Installation

First step in preparation involves checking the unit for any shipping damage.

Section 4. Setting the Unit

4.1 Pad Installation

Guidelines for installing the unit on a support pad, ensuring levelness and drainage.

Section 5. Refrigerant Line Considerations

5.1 Refrigerant Line and Service Valve Connection Sizes

Provides a table detailing line sizes and service valve connection sizes for various models.

5.2 Factory Charge

Information on the factory refrigerant charge and how to verify proper system charge.

5.3 Required Refrigerant Line Length

Instructions to determine required line length and lift for system configuration.

5.4 Refrigerant Line Insulation

Emphasizes the importance of insulating the vapor line and preventing contact.

5.5 Reuse Existing Refrigerant Lines

Precautions for using existing refrigerant lines in retrofit applications.

Section 6. Refrigerant Line Routing

6.1 Precautions

Key precautions for routing refrigerant lines to prevent noise and ensure proper installation.

Section 7. Refrigerant Line Brazing

7.1 Braze The Refrigerant Lines

Step-by-step instructions for brazing refrigerant lines to service valves.

Section 8. Refrigerant Line Leak Check

8.1 Check For Leaks

Procedure for pressurizing lines with nitrogen and checking for leaks using soapy solution.

Section 9. Evacuation

9.1 Evacuate the Refrigerant Lines and Indoor Coil

Instructions on how to evacuate the system to a specific micron level for proper operation.

Section 10. Service Valves

10.1 Open the Gas Service Valve

Steps for safely opening the gas service valve to the fully open position.

10.2 Open the Liquid Service Valve

Detailed procedure and warning for opening the liquid line service valve.

Section 11. Electrical - Low Voltage

11.1 Low Voltage Maximum Wire Length

Table specifying maximum wire lengths for low voltage wiring based on gauge size.

11.2 Low Voltage Hook-up Diagrams

Wiring diagrams for connecting thermostats, air handlers, and outdoor units for Heat Pump and AC systems.

Section 12. Electrical - High Voltage

12.1 High Voltage Power Supply

Information on high voltage power supply requirements and compliance with codes.

12.2 High Voltage Disconnect Switch

Recommendation to install a separate disconnect switch at the outdoor unit.

12.3 High Voltage Ground

Requirement to ground the outdoor unit according to national, state, and local codes.

Section 13. Start Up

13.1 System Start Up

Step-by-step guide for powering up the system after installation is complete.

Section 14. System Charge Adjustment (Systems can be rated with TXV, EEV or Piston)

14.1 Temperature Measurements

Instructions for measuring outdoor and indoor temperatures for system charging.

14.2 Subcooling Charging in Cooling (Above 55º F Outdoor Temp.)

Method for subcooling charging in cooling mode for systems with TXV or EEV.

Section 15. Checkout Procedures and Troubleshooting

15.1 Operational And Checkout Procedures

List of procedures to perform after installation to ensure proper operation and safety.

15.2 Troubleshooting

Flowchart for diagnosing and resolving common compressor start-up issues.

Section 16. Refrigerant Circuits

1 1;2-Ton Units

Diagram illustrating refrigerant flow and components for 1 1/2-Ton units.

2, 2 1;2 & 3-Ton Units

Diagram of refrigerant flow and components for 2, 2 1/2, and 3-Ton units.

3 1;2 & 4-Ton Units

Diagram of refrigerant flow and components for 3 1/2 and 4-Ton units.

5-Ton Units

Diagram illustrating refrigerant flow and components for 5-Ton units.

This document is an Installer's Guide for Trane Condensing Units, providing comprehensive instructions for installation, startup, and troubleshooting. It emphasizes compliance with national, state, and local codes throughout all installation phases.

Function Description:

The guide details the proper procedures for installing and servicing Trane Condensing Units, which are integral components of heating, ventilating, and air-conditioning (HVAC) systems. It covers everything from initial unit preparation and placement to refrigerant line installation, electrical connections, system startup, and charge adjustment. The document is intended for qualified personnel due to the hazardous nature of HVAC equipment installation and servicing. It highlights the importance of using approved matched indoor and outdoor systems to ensure maximum efficiency, optimum performance, and overall system reliability.

Important Technical Specifications:

Refrigerant Type: These units use R-410A refrigerant, which operates at 50-70% higher pressures than R-22. Specific handling precautions for R-410A and POE oil are outlined, including the need for R-410A approved service equipment and the replacement of compressor oil if the system has been open to the atmosphere for more than 4 hours.
Unit Dimensions and Weight: A table (Table 2.1) provides the height (H), depth (D), and width (W) in inches, along with estimated weights in pounds for various models (A4AC4018A, A4AC4023A, A4AC4024A, A4AC4030A, A4AC4036A, A4AC4042A, A4AC4048A, A4AC4060A). For example, the A4AC4018A measures 28.6 x 23.6 x 23.6 inches and weighs approximately 130 lbs, while the A4AC4060A measures 36.6 x 34.3 x 34.3 inches and weighs around 220 lbs.
Refrigerant Piping Limits:
- Maximum length of refrigerant lines: 60 feet from outdoor to indoor unit.
- Maximum vertical change: 60 feet.
- Service valve connection diameters are specified in Table 5.1, varying by model (e.g., 3/4" vapor line and 3/8" liquid line for A4AC4018A-A4AC4036A; 7/8" vapor line and 3/8" liquid line for A4AC4042A-A4AC4060A).
Factory Charge: Outdoor condensing units are factory charged for the outdoor unit, 10 feet of tested connecting line, and the smallest rated indoor evaporative coil match. Proper system charge must be verified via subcooling (for TXV/EEV) or superheat (for fixed orifice) per the unit nameplate.
Refrigerant Adders: A "Tubing Information" table provides refrigerant adders in ounces for additional line lengths (20 ft, 30 ft, 40 ft, 50 ft, 60 ft) for both 3/4" and 7/8" suction lines with a 3/8" liquid line.
Low Voltage Wiring: Table 11.1 specifies maximum wire lengths for 24-volt systems based on wire size: 18 AWG (150 ft), 16 AWG (225 ft), and 14 AWG (300 ft).
System Charge Adjustment: The guide includes detailed charts for Subcooling Charging (for TXV/EEV units) and Fixed Orifice Superheat Charging, providing corrections based on refrigerant line lift and length, and outdoor/indoor temperatures. For example, the Subcool Charging Chart Corrections Table shows adders (e.g., Add 1° to 6° of Subcooling) based on refrigerant line lift and total line length for different tonnage units (1 1/2 Ton to 5 Ton). The R-410A Refrigerant Charging Chart provides liquid gage pressure (PSI) based on liquid temperature (°F) and final subcooling (°F).

Usage Features:

Unit Placement: Guidelines for optimal unit location include ensuring at least 5 feet of unrestricted space above the unit, 3 feet clearance in front of control boxes and service sides, and a minimum of 12 inches from walls or shrubbery for adequate airflow. It also advises against locating units near bedrooms due to potential operational sounds and away from structures to prevent roof runoff water.
Pad Installation: The support pad should be at least 1 inch larger than the unit on all sides, separate from any structure, level, high enough for drainage, and compliant with codes.
Refrigerant Line Routing: Emphasizes precautions to prevent noise from vibration transmission, recommending isolation-type hangers when fastening lines to joists, rafters, or walls. It also advises insulating and isolating lines running through walls or sills and minimizing 90-degree turns.
Brazing Procedures: Detailed steps for brazing refrigerant lines, including deburring, cleaning, removing valve cores, purging with dry nitrogen, wrapping valve bodies with wet rags to prevent heat damage, and installing a drier in the liquid line.
Leak Check and Evacuation: Instructions for pressurizing lines to 150 PSIG with dry nitrogen for leak checks and evacuating the system to no higher than 350 microns using a micron gauge.
Service Valve Operation: Clear steps for opening both gas and liquid service valves, including the critical warning for the liquid line service valve to turn counterclockwise until the stem just touches the rolled edge, requiring no torque.
Electrical Connections: Provides low voltage hook-up diagrams for both heat pump and AC systems, illustrating connections between the thermostat, air handler, and outdoor unit. It also covers high voltage power supply requirements, including installing a separate disconnect switch and grounding the outdoor unit.
System Start-Up: A five-step process for system start-up, including setting the thermostat to OFF, applying power, waiting one hour if a compressor crankcase heater accessory is used and ambient temperature is below 70°F, and finally setting the thermostat to ON.
System Charge Adjustment: Instructions for checking outdoor and indoor temperatures, stabilizing the system for at least 20 minutes before making measurements, and adjusting refrigerant levels based on subcooling or superheat charts.

Maintenance Features:

Pre-Installation Inspection: Advises checking for damage upon arrival and reporting it to the carrier.
Retrofit Applications: For existing refrigerant lines and indoor evaporator coils, it's crucial to ensure correct sizing, freedom from leaks, acid, and oil.
Post-Installation Checkout: A comprehensive "CHECKOUT PROCEDURE" checklist covers verifying leak-free refrigerant lines, proper insulation, secure and isolated lines, sealed masonry passages, tight electrical connections, smooth outdoor fan operation, free-draining indoor coil drain line, unobstructed supply registers and return grilles, installed return air filter, correct airflow setting, and safe operation in all modes.
Troubleshooting: Includes detailed flowcharts for "Compressor fails to start" and "Compressor won't run" scenarios, guiding technicians through checks for contactor issues, voltage presence, control transformer and fuse integrity, open IOL (Internal Overload), resistance checks of compressor windings, locked rotor conditions, and start/run capacitor issues.
Refrigerant Circuits: Diagrams illustrate the refrigerant flow and component layout for 1 1/2-Ton, 2, 2 1/2 & 3-Ton, 3 1/2 & 4-Ton, and 5-Ton units, aiding in understanding the system's internal workings.