American Standard HVAC 4A7A4025N Manual

The American Standard 4A7A4025N is a high-efficiency, single-stage 2-ton air conditioner unit designed for residential use. It features a durable, weather-resistant cabinet, a scroll compressor for quiet operation, and a high-efficiency coil. This manual covers safety information, installation procedures, startup and commissioning, operation, maintenance, troubleshooting, and specifications for proper handling and service.

Features at a Glance

Key components: Weather-resistant galvanized steel cabinet, Single-stage scroll compressor, High-efficiency louvered coil, Liquid line filter-drier, Service valves, and a Sound-reducing top grille.

Installation Requirements

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

1. Location: Install on a level, stable pad (concrete or composite) with adequate clearance (min 24" on all sides, 48" above).
2. Lifting: Use lifting lugs or a sling. Do not lift by refrigerant lines or service valves.
3. Line Set: Connect pre-charged, insulated refrigerant lines from indoor unit. Ensure lines are properly sized and supported.
4. Condensate Drain: Connect to indoor unit's drain line per local codes.
5. Electrical: Connect power and control wiring through the provided conduit knockouts.

WARNING! Installation must be performed by a qualified HVAC technician in accordance with all national and local codes. Disconnect all power before servicing.

Startup & Commissioning

After installation, perform the following startup procedure.

1. Pre-Start Check: Verify all electrical connections are tight. Ensure refrigerant lines are connected and service valves are open.
2. Thermostat Setup: Set thermostat to OFF. Restore power to indoor and outdoor units.
3. System Start: Set thermostat to COOL and a temperature below room temp. The compressor and fan should engage.
4. Performance Check: Measure superheat and subcooling. Verify system pressures and temperatures are within specified ranges.
5. Airflow Verification: Check indoor airflow (typically 800-950 CFM for 2-ton). Adjust blower speed if necessary.

CAUTION! Do not operate the unit without the proper refrigerant charge. Incorrect charge can damage the compressor.

Specifications

• Model: 4A7A4025N
• Cooling Capacity: 24,000 BTU/h (2 Tons)
• SEER Rating: Up to 16 SEER
• Refrigerant: R-410A, Factory Charge: [See Unit Rating Plate]
• Electrical: 208/230V, 1 Phase, 60 Hz. Min Circuit Ampacity: 15A, Max Fuse Size: 25A.
• Operating Range: Outdoor Temp: 55°F to 115°F (13°C to 46°C).
• Sound Level: Approximately 72 dB(A) at 3 ft.
• Dimensions (LxWxH): Approx. 31" x 31" x 26"
• Net Weight: Approx. 165 lbs
• Compatible Indoor Units: Refer to American Standard matched system guide.

Unit Controls & Operation

Primary control is via the indoor thermostat. The outdoor unit has internal protection controls.

Internal Protections: High-pressure switch, Low-pressure switch, Compressor overload, Time-delay relay (typically 5 min).

Normal Operation Cycle: Thermostat calls for cooling, engages contactor, compressor and fan start. System runs until setpoint is reached. The time-delay prevents short cycling.

LED Status Light (if equipped): A flashing pattern may indicate normal operation or fault codes (refer to service label on unit).

Electrical Connections

Connect power wiring to the terminal block in the unit's electrical compartment.

1. Disconnect all power sources.
2. Remove the access panel to expose the terminal block.
3. Route power wires (L1, L2) and ground through the conduit connection. Connect to the terminal block (typically labeled L1, L2, and GND).
4. Route 24V control wires from the indoor unit (Y, C, sometimes O/B for heat pump models) to the corresponding low-voltage terminals.
5. Secure all connections. Replace the access panel before restoring power.

Tip: Use copper conductors only. Follow the wiring diagram located on the inside of the access panel.

Refrigerant Handling

This unit uses R-410A, a high-pressure refrigerant. Special tools and certification are required.

1. Recovery: Use an EPA-certified recovery machine designed for R-410A.
2. Charging: Charge as a liquid into the high-side service port with the system OFF. Final charge adjustment must be done by superheat/subcooling method with the system running.
3. Leak Checking: Use electronic leak detectors, nitrogen with bubbles, or fluorescent dye. R-410A operates at ~50% higher pressure than R-22.
4. Service Valves: Use a backup wrench when opening or closing. Ensure valve caps are installed and tightened after service.

WARNING! R-410A systems require special gauges, hoses, and recovery equipment rated for higher pressure. Never mix refrigerants.

Maintenance Procedures

Annual maintenance by a qualified technician is recommended.

1. Inspect Coil: Clean the outdoor coil with a fin comb and gentle water spray (power off). Remove debris.
2. Check Electrical: Inspect contactor for pitting. Check capacitor(s) for bulging or incorrect microfarad rating.
3. Verify Airflow: Ensure indoor return and supply vents are unobstructed. Replace indoor air filter regularly (homeowner task).
4. Check Refrigerant Charge: Measure superheat/subcooling and compare to charging chart.
5. Inspect Fan Motor & Blades: Check for smooth operation and secure mounting.

Care & Cleaning

Homeowner: Keep area around outdoor unit clear of leaves, grass clippings, and shrubs (min 24" clearance). Hose down the coil gently from the inside out to remove light dust. Do not use a pressure washer.

Technician: Use commercial coil cleaner for heavy dirt. Rinse thoroughly. Straighten bent fins with a fin comb.

CAUTION! Always disconnect power before cleaning or performing any maintenance. Do not use harsh chemicals or abrasive tools on the coil.

Regulatory Information

This equipment is designed to comply with applicable UL standards and U.S. safety codes. The refrigerant circuit contains R-410A, which is regulated by the EPA under Section 608 of the Clean Air Act. Technicians must be certified to service this equipment. Proper recovery and recycling of refrigerant is mandatory. This product may be covered by one or more U.S. patents. For warranty details, see the warranty certificate provided with the unit or contact American Standard. For technical support, contact American Standard at 1-800-926-4662 or visit www.americanstandardair.com.

Troubleshooting

Reset: Turn thermostat to OFF. Turn off power at disconnect for 1 minute. Restore power and resume operation.

Service: For all complex issues, contact a qualified American Standard dealer. 1-800-926-4662; www.americanstandardair.com