Trane A4AC4018B1000A - User Manual

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

This document is an installer's guide for condensing units, specifically models A4AC4018B1000A, A4AC4023A1000A, A4AC4024A1000A, A4AC4030B1000A, A4AC4036A1000A, A4AC4042A1000A, A4AC4048A1000A, and A4AC4060A1000A. It provides comprehensive instructions for the safe and proper installation, start-up, and servicing of these outdoor air conditioning units.

Function Description:

The condensing units are designed for residential air conditioning applications, working in conjunction with indoor evaporator coils and air handlers to create comfortable, energy-efficient indoor environments. They are part of a split system, where the outdoor unit (condensing unit) and indoor unit (evaporator coil/air handler) are connected by refrigerant lines. The guide emphasizes the importance of using approved matched indoor and outdoor systems for maximum efficiency, optimum performance, and best overall system reliability.

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. R-410A systems use POE oil, which readily absorbs moisture, requiring the system to remain sealed whenever possible.
Refrigerant Line Limits:
- Maximum horizontal length: 60 feet.
- Maximum vertical change (lift): 60 feet.
- For line lengths exceeding 60 feet, refer to the Refrigerant Piping Application Guide (SS-APG006-EN) or Refrigerant Piping Software Program (32-3312-03).
Factory Charge: Units are factory charged with the system charge required for the outdoor condensing unit, ten (10) feet of tested connecting line, and the smallest rated indoor evaporative coil match. Proper system charge must always be verified via subcooling (for TXV/EEV systems) or superheat (for fixed orifice systems) as per the unit nameplate.
Low Voltage Wiring:
- 18 AWG: Max. 150 Ft.
- 16 AWG: Max. 225 Ft.
- 14 AWG: Max. 300 Ft.
Unit Dimensions and Weight (H x D x W in / Weight lb):*
- A4AC4018B: 28.6 x 23.6 x 23.6 / 130
- A4AC4023A: 32.6 x 23.6 x 23.6 / 130
- A4AC4024A: 28.6 x 25.6 x 25.6 / 134
- A4AC4030B: 28.6 x 29.8 x 29.8 / 163
- A4AC4036A: 32.6 x 29.8 x 29.8 / 161
- A4AC4042A: 28.6 x 34.3 x 34.3 / 159
- A4AC4048A: 28.6 x 34.3 x 34.3 / 159
- A4AC4060A: 36.6 x 34.3 x 34.3 / 220
- *Weight values are estimated.
Refrigerant Line and Service Valve Connection Sizes:
- Models A4AC4018B to A4AC4036A: Vapor Line 3/4", Liquid Line 3/8".
- Models A4AC4042A to A4AC4060A: Vapor Line 7/8", Liquid Line 3/8".
Refrigerant Adders for Line Lengths:
- For 3/4" Vapor Line / 3/8" Liquid Line: 3 oz (20 ft), 9 oz (30 ft), 15 oz (40 ft), 21 oz (50 ft), 27 oz (60 ft).
- For 7/8" Vapor Line / 3/8" Liquid Line: 3 oz (20 ft), 9 oz (30 ft), 16 oz (40 ft), 22 oz (50 ft), 28 oz (60 ft).

Usage Features:

Installation Location:
- Top discharge area must be unrestricted for at least 5 feet above the unit.
- 3 feet clearance in front of control box (access panels) and any other side requiring service.
- Minimum 12 inches from any wall or surrounding shrubbery for adequate airflow.
- Avoid locating near bedrooms due to operational sounds.
- When mounting on a roof, ensure adequate support and proper isolation to alleviate sound/vibration transmission.
- Locate far enough from structures to prevent roof runoff water from pouring directly on the unit.
Pad Installation: The support pad (e.g., concrete slab) should be at least 1 inch larger than the unit on all sides, separate from any structure, level, high enough for drainage, and comply with all codes.
Refrigerant Line Routing: Precautions must be taken to prevent noise from vibration transmission. Use isolation-type hangers when fastening lines to joists, rafters, walls, or other structural elements. Insulate and isolate lines running through walls or sills, and minimize 90-degree turns.
Electrical Connections: All phases of installation must comply with national, state, and local codes. High voltage power supply must match the equipment nameplate. A separate disconnect switch must be installed at the outdoor unit. Flexible electrical conduit is recommended for high voltage connections to minimize vibration noise. The outdoor unit must be grounded per code requirements.
Start-Up Procedure:
1. Ensure sections on safety, unit location, preparation, setting, refrigerant lines, brazing, leak check, evacuation, service valves, and electrical connections are completed.
2. Set system thermostat to OFF.
3. Turn on disconnect(s) to apply power.
4. Wait one hour before starting if a compressor crankcase heater accessory is used and ambient temperature is below 70°F.
5. Set system thermostat to ON.
System Charge Adjustment:
- For piston metering devices, refer to the Superheat charging method.
- For TXV or EEV indoor metering devices, refer to the Subcool charging method.
- Subcooling (in cooling mode) is the recommended charging method above 55°F ambient outdoor temperature.
- Indoor temperature should be kept between 70°F and 80°F for best results.
- Allow the system to operate for a minimum of 20 minutes to stabilize before making accurate charge measurements.

Maintenance Features:

Refrigerant Line Brazing:
1. Debur and clean pipe ends.
2. Remove pressure tap caps and valve cores from service valves.
3. Purge lines and indoor coil with dry nitrogen during brazing.
4. Wrap a wet rag around valve bodies to prevent heat damage.
5. Install a drier in the liquid line.
6. Replace valve cores and caps after valves have cooled.
Refrigerant Line Leak Check: Pressurize lines and evaporator coil to 150 PSIG with dry nitrogen, then check for leaks using a soapy solution. Repair any leaks before proceeding.
Evacuation: Evacuate until the micron gauge reads no higher than 350 microns. Evacuation is complete if the micron gauge does not rise above 500 microns in one minute after closing the valve to the vacuum pump.
Service Valves:
- Gas Service Valve: Turn 1/4 turn counterclockwise to fully open.
- Liquid Service Valve: Fully insert 3/16" hex wrench and back out counterclockwise until the valve stem just touches the rolled edge (approx. five turns).
- Always replace valve stem caps and tighten finger-tight plus an additional 1/6 turn to prevent leaks.
Reuse of Existing Refrigerant Lines: For retrofit applications, ensure existing lines are the correct size, free of leaks, acid, and oil, and all joints are brazed, not soldered.
Checkout Procedures: A final unit inspection is recommended to ensure factory tubing has not shifted, wiring connections are tight, and all components are properly secured. A checklist is provided to verify proper insulation, drainage, airflow, filter installation, and overall system operation in each mode.
Troubleshooting: Flowcharts are provided for diagnosing common issues such as "Compressor fails to start" and "Compressor won't run," guiding the installer through checks of contactor, voltage, transformer, fuse, IOL, windings, start/run capacitors, and relays. A system faults table helps identify primary and secondary causes for various refrigerant circuit and electrical problems.