American Standard HVAC 4TXM2118A12N0A Manual

The American Standard 4TXM2118A12N0A is a high-efficiency, single-stage, 18 SEER air conditioner condenser unit designed for residential use. It features a durable WeatherArmor™ Ultra protection system, Spine Fin™ coil technology for enhanced heat transfer, low sound operation, compatibility with American Standard communicating thermostats, and is engineered to work with matching indoor units for optimal performance. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Durable outdoor cabinet with Spine Fin™ coil, Compressor with sound insulation, Electrical connection box, Service valves, and Fan assembly.

Installation Requirements

Unpack and inspect unit for shipping damage. Select a suitable location.

1. Location: Place on a level, stable pad (concrete or composite) with adequate clearance (min 24" on all sides, 48" above). Ensure proper drainage.
2. Electrical Connection: Disconnect all power. Connect field-supplied power wiring to unit disconnect and then to the unit's connection box per NEC and local codes. Unit requires 208/230V, 1-phase power.
3. Refrigerant Lines: Connect clean, dehydrated, and correctly sized copper refrigerant linesets between outdoor unit and matched indoor coil. Brazing must be done with nitrogen purge.
4. Condensate Drain: Ensure indoor unit condensate drain line is properly installed and unobstructed.
5. Thermostat Wiring: Run low-voltage control wire (minimum 18 AWG) from indoor unit to outdoor unit and to thermostat location.

WARNING! Installation must be performed by a qualified HVAC technician in accordance with all local, state, and national codes. Incorrect installation can cause property damage, personal injury, or death. Handle refrigerant responsibly.

First-Time Startup & Commissioning

Do not energize unit until all installation steps are complete and verified.

1. Pre-Start Check: Verify all electrical connections are tight. Ensure refrigerant lines are connected, leak-checked, and properly insulated. Confirm correct airflow at indoor unit.
2. Power On: Restore power at disconnect and indoor unit.
3. System Commissioning: Using a calibrated manifold gauge set, measure and adjust system refrigerant charge per the manufacturer's subcooling method specified in the installation instructions. Do not rely on nameplate charge alone.
4. Thermostat Setup: Configure compatible thermostat (e.g., American Standard AccuLink) for system type and desired settings. For non-communicating thermostats, ensure wiring is correct for single-stage cooling.
5. Test Operation: Set thermostat to cool mode below room temperature. Verify unit starts, runs quietly, cools effectively, and cycles off correctly. Check condensate drainage.

CAUTION! Never start the unit with service valves closed. Do not bypass safety devices. Record all commissioning data (voltages, amperages, pressures, temperatures) for future reference.

Specifications

• Model Number: 4TXM2118A12N0A
• Cooling Capacity: Approx. 18,000 BTU/h (1.5 Ton)
• SEER Rating: Up to 18 SEER (depends on matched indoor unit)
• Refrigerant Type: R-410A
• Electrical Data: 208/230V, 1 Phase, 60 Hz. Minimum Circuit Ampacity (MCA): 15.0, Maximum Overcurrent Protection (MOP): 25A.
• Operating Ambient Range: 55°F to 115°F (13°C to 46°C) for cooling.
• Sound Level: As low as 72 dB (varies with installation).
• Liquid Line Connection: 3/8" SAE Flare
• Suction Line Connection: 3/4" SAE Flare
• Net Weight: Approx. 150 lbs (68 kg)
• Compliance: AHRI Certified, meets DOE efficiency standards.

Controls and Operation

Primary control is via the indoor thermostat. Unit has an internal control board with LED status light.

Thermostat Operation: Set to COOL mode and desired temperature. Fan can be set to AUTO (cycles with compressor) or ON (continuous).

Unit Status LED: Located on control board inside service panel. Flash patterns indicate normal operation or fault conditions (see Troubleshooting section).

Safety Controls: Unit includes high-pressure switch, low-pressure switch, compressor overload, and anti-short cycle timer (typically 5 minutes).

Communicating Systems: If paired with an AccuLink indoor unit and thermostat, the system performs automatic configuration, diagnostics, and advanced staging for efficiency and comfort.

Connecting to Indoor Unit & Thermostat

This unit must be paired with an approved American Standard indoor coil or air handler.

1. Turn off all power to indoor and outdoor units.
2. Refrigerant Lines: Connect vapor and liquid lines. Ensure flares are properly made and leak-checked.
3. Control Wiring: Connect low-voltage wires (typically Y, C, G, R/O) between outdoor unit terminal block and indoor unit terminal block. Follow wiring diagram on unit panels.
4. Thermostat: Connect control wires from indoor unit to thermostat sub-base. For communicating systems, use specific 4-wire cable to AccuLink thermostat.
5. Restore power and verify operation.

Tip: Always refer to the installation instructions for the specific indoor unit model for correct wiring and setup details.

Maintenance Procedures

Homeowner (Annual):

1. Keep unit clear of debris, leaves, grass clippings, and snow (maintain 24” clearance).
2. Gently rinse outdoor coil with a garden hose (from the inside out) to remove dirt and pollen. Turn power off first.
3. Ensure shrubs or plants do not obstruct airflow.

Qualified Technician (Annual):

1. Inspect electrical connections for tightness and corrosion.
2. Check refrigerant charge via subcooling method.
3. Measure voltage and amperage on compressor and fan motor.
4. Inspect coil for damage and clean if necessary.
5. Check fan motor and blades for proper operation and balance.
6. Verify condensate drain on indoor unit is clear.
7. Lubricate motors only if specified (most are permanently lubricated).

Safety Features

High & Low Pressure Switches: Protect compressor from abnormal system pressures.

Compressor Overload Protector: Internal protection against overheating.

Anti-Short Cycle Timer: Prevents compressor from restarting for approximately 5 minutes after shutdown to protect it.

Fused Disconnect Required: A field-supplied fused disconnect switch must be installed within sight of the unit per electrical code.

Care & Cleaning

Outdoor Coil: Turn OFF power at the disconnect. Remove large debris by hand. Use a soft brush or low-pressure water spray from the inside of the coil facing out to wash away dirt. Do not use a pressure washer as it can bend fins.

Cabinet: Wipe with a damp cloth. Do not use harsh chemicals or abrasive cleaners.

CAUTION! Always disconnect power before performing any cleaning or maintenance. Do not attempt to straighten coil fins with a sharp object. Keep the top grille (fan guard) in place at all times.

Regulatory Information

This product complies with applicable U.S. safety and performance standards. The refrigerant, R-410A, is subject to EPA regulations (Section 608). Technicians must be certified to service this equipment. Proper recovery and recycling of refrigerant is required by law. This unit contains materials that may be recyclable. Check local ordinances for disposal. For technical support or warranty service, contact your installing American Standard dealer or visit www.americanstandardair.com.

Troubleshooting

NOTE: Most repairs should be performed by a qualified HVAC technician.

Reset: Turning power off at the disconnect for 5 minutes may reset internal fault lockouts. If problem persists, call for service.

Service: Contact your local American Standard dealer. For product information: www.americanstandardair.com.