American Standard HVAC 4TXM2124A13N0A Manual

The American Standard 4TXM2124A13N0A is a high-efficiency 2-ton outdoor condensing unit designed for residential split-system air conditioning and heat pump applications. It features a durable, weather-resistant cabinet, scroll compressor technology, R-410A refrigerant, and compatibility with American Standard indoor units for optimal performance. Below are key sections covering safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Weather-resistant galvanized steel cabinet, Scroll compressor, Copper tube/aluminum fin coil, High and low pressure service valves, Liquid line filter-drier, and Control box with contactor and capacitor.

Installation Requirements

Unit must be installed by a qualified HVAC technician in accordance with all local codes and ordinances.

1. Location: Select a level, stable pad (concrete or composite) with adequate clearance (min 24" on all sides, 48" above).
2. Electrical: Connect to a dedicated circuit with proper disconnect and overcurrent protection as per nameplate.
3. Refrigerant Lines: Connect matched, insulated copper linesets between outdoor unit and indoor coil. Brazing with nitrogen purge is required.
4. Condensate Drain: Ensure indoor unit drain line is properly installed and trapped.
5. System Evacuation & Charging: Evacuate system to 500 microns and charge with R-410A by weight per data plate.

WARNING! Installation and service must be performed by a licensed professional. Incorrect handling of refrigerant can cause injury or system damage.

First-Time Startup

After installation, perform the following startup procedure:

1. Inspection: Verify all electrical connections are tight, linesets are secured and insulated, and the cabinet panels are in place.
2. Power On: Energize the disconnect switch. The unit should be in standby mode.
3. Thermostat Call: Set the indoor thermostat to "Cool" mode and a temperature below room temperature to initiate a cooling cycle.
4. System Check: Listen for compressor and fan start-up. Check for proper airflow at indoor registers and verify the outdoor fan is operating.
5. Measurements: Technician should measure superheat/subcooling, system pressures, voltage, and amperage to confirm correct charge and operation.

CAUTION! Do not operate the system without the service access panels securely fastened.

Technical Specifications

• Model: 4TXM2124A13N0A
• Cooling Capacity: 24,000 BTU/H (2 Tons)
• SEER Rating: Up to 16 SEER (when paired with a matched indoor unit)
• Refrigerant Type & Charge: R-410A, see unit data plate for factory charge
• Operating Voltage: 208/230V AC, 1 Phase, 60 Hz
• Maximum Overcurrent Protection: 25 Amps
• Minimum Circuit Ampacity: 19.0 Amps
• Compressor Rated Load Amps (RLA): 10.8
• Fan Motor Rated Load Amps (RLA): 1.0
• Liquid Line Connection Size: 3/8" SAE
• Suction Line Connection Size: 3/4" SAE
• Operating Ambient Temperature Range (Cooling): 55°F to 115°F
• Sound Level: Approximately 72 dB(A)
• Net Weight: 145 lbs (65.8 kg)

Controls and Operation

Primary control is via the indoor thermostat. The outdoor unit contains a control board that manages compressor, fan, and safety functions.

Normal Operation: When the thermostat calls for cooling, it sends a 24V signal to the outdoor unit. The control board engages the contactor, starting the compressor and outdoor fan motor.

Integrated Controls: The unit includes inherent safety controls: - High Pressure Switch: Opens on excessively high discharge pressure. - Low Pressure Switch: Opens on excessively low suction pressure. - Compressor Overload Protector: Internal thermal protection. - Anti-Short Cycle Timer: Prevents compressor from restarting for approximately 5 minutes after shutdown.

LED Status Light: Located on the control board. A steady flash pattern indicates normal operation. Specific flash codes aid in troubleshooting (see section 12).

System Configuration

This outdoor unit must be paired with a compatible American Standard indoor unit (air handler or furnace coil) for proper operation.

1. Indoor Match: Consult the product specification sheet or a certified dealer for approved indoor coil and air handler models.
2. Thermostat: Use a compatible thermostat. For advanced features like dehumidification, a communicating thermostat may be required.
3. Airflow: Ensure the indoor blower is set to deliver the correct CFM (typically 800 CFM for 2-ton cooling).
4. Refrigerant Adjustment: Final refrigerant charge must be adjusted based on the actual installed lineset length per manufacturer's guidelines.

Tip: System performance and efficiency depend on a correctly matched and installed indoor unit.

Maintenance Procedures

Homeowner (Visual):

1. Keep the outdoor unit clear of debris, leaves, snow, and vegetation (maintain 24-inch clearance).
2. Gently rinse the exterior coil with a garden hose (from the inside out) at the beginning of each cooling season. Ensure power is OFF at the disconnect.
3. Do not stack items on or lean objects against the unit.

Professional Service (Annual):

1. Inspect electrical connections for tightness and corrosion.
2. Check refrigerant charge via superheat/subcooling method.
3. Inspect coil for damage and clean if necessary.
4. Check fan motor and blades for proper operation and balance.
5. Verify all safety controls are functional.
6. Lubricate motors per manufacturer specifications (if applicable).

Safety Features

The unit includes multiple safety devices to protect the compressor and system:

• High & Low Pressure Switches: Protect against abnormal operating pressures.
• Compressor Internal Overload: Protects against overheating.
• Fuse or Circuit Breaker on Control Board: Protects the low-voltage control circuit.
• Anti-Short Cycle Timer: Protects compressor from rapid cycling.

WARNING: Bypassing safety devices is dangerous and will void the warranty.

Care & Cleaning

Outdoor Unit: Keep the coil clean. Wash with water only. Do not use pressure washers or harsh chemicals. Straighten any bent fins with a fin comb.

Cabinet: Wipe with a damp cloth if needed. Do not paint the coil or obstruct airflow.

CAUTION! Always turn off electrical power at the disconnect switch before performing any cleaning or maintenance near the unit.

Regulatory Information

This product complies with applicable U.S. safety and performance standards. It contains R-410A refrigerant, which must be recovered and reclaimed by EPA-certified technicians. The manufacturer's warranty is limited and provided in a separate document. For technical support, warranty registration, or to locate a dealer, visit www.americanstandard.com or contact American Standard Heating & Air Conditioning at 1-800-428-4328.

Troubleshooting Guide

Note: For safety and warranty, most repairs should be performed by a qualified technician. The following is a basic guide.

LED Flash Codes (Control Board): Steady flash = normal. 1 flash = Loss of charge/Low pressure. 2 flashes = High pressure. 3 flashes = Compressor overload/open. 5 flashes = Control board fault.

Service: Contact an American Standard dealer or 1-800-428-4328.