American Standard HVAC ALLEGIANCE 2A7A8 Manual

The American Standard ALLEGIANCE 2A7A8 is a high-efficiency residential air conditioning unit designed for reliable cooling performance. This manual covers the installation, operation, maintenance, and troubleshooting of the 2A7A8 series. Key sections include safety precautions, system specifications, installation guidelines, start-up procedures, maintenance schedules, and common troubleshooting steps.

Features at a Glance

Key components: High-efficiency scroll compressor, corrosion-resistant coil, sound-reducing fan, weatherproof cabinet, and factory-installed filter drier.

Installation Guidelines

Unpack and inspect unit for shipping damage. Select appropriate location with proper clearances.

1. Position unit: Place on level concrete pad or approved mounting system with minimum 24-inch clearance on all sides.
2. Connect refrigerant lines: Use clean, dehydrated copper tubing of correct size. Braze with nitrogen purge.
3. Connect electrical: Follow local codes. Connect to disconnect switch and thermostat wiring.
4. Connect condensate drain: Install proper drainage to prevent water accumulation.
5. Evacuate and charge: Evacuate system to 500 microns, then charge with specified amount of R-410A.

WARNING! Installation must be performed by qualified HVAC technician. Follow all safety procedures and local codes.

First-Time Start-Up

After installation, perform initial start-up and system check.

1. Verify electrical connections: Ensure all connections are tight and correct.
2. Check refrigerant charge: Measure superheat/subcooling per specifications.
3. Start system: Turn on power at disconnect, then set thermostat to cooling mode.
4. Monitor operation: Check for proper airflow, temperature drop, and unusual noises.
5. Test safety controls: Verify high-pressure and low-pressure switches function properly.

CAUTION! Do not operate without proper refrigerant charge. Ensure all access panels are securely in place.

Specifications

• Model Series: 2A7A8
• Cooling Capacity: 1.5 to 5 tons (18,000 to 60,000 BTU/h)
• SEER Rating: Up to 16 SEER
• Refrigerant: R-410A
• Electrical Requirements: 208/230V, 1-phase, 60Hz
• Operating Ambient: 55°F to 115°F (13°C to 46°C)
• Sound Level: As low as 72 dB(A)
• Compressor Type: Scroll
• Fan Motor: Permanent split capacitor
• Warranty: Limited 10-year parts, 10-year compressor

Controls and Settings

Primary control through connected thermostat. Unit includes internal safety controls and diagnostic LEDs.

Thermostat Settings: COOL, OFF, HEAT (with heat pump models), FAN (AUTO/ON).

Unit Controls: High-pressure switch, low-pressure switch, compressor overload protection, fan delay, diagnostic LED (flashes error codes).

Operating Parameters: Set temperature differential (typically 1-2°F), fan operation mode, system mode.

Connecting to Thermostat

Connect unit to compatible thermostat for proper operation.

1. Turn off power at disconnect before wiring.
2. Match thermostat wires to unit terminal block: R (24V power), C (common), Y (compressor), G (fan), O/B (reversing valve for heat pumps).
3. Secure connections and replace access panel.
4. Restore power and test thermostat operation.

Tip: Use thermostat compatible with R-410A systems. Programmable thermostats recommended for energy savings.

Operating Instructions

For normal cooling operation.

1. Set thermostat to COOL mode.
2. Set desired temperature (typically 72-78°F).
3. Set fan to AUTO (cycles with compressor) or ON (continuous).
4. System will cycle automatically to maintain set temperature.
5. For seasonal shutdown: Turn thermostat to OFF, then turn off power at disconnect.

WARNING! Do not set thermostat below 68°F for extended periods. Allow system to complete cycles; avoid frequent on/off cycling.

Maintenance Procedures

Regular maintenance ensures optimal performance and longevity.

• Monthly: Check air filter (indoors), clear debris around outdoor unit.
• Seasonal: Clean condenser coil, check refrigerant charge, inspect electrical connections.
• Annual: Professional inspection including: check capacitors, contactors, fan motor, refrigerant levels, and system pressures.

Maintenance Schedule: Spring (before cooling season) and Fall (after cooling season).

Care & Cleaning

Keep unit clean for optimal efficiency.

1. Turn off power before cleaning.
2. Remove debris from around outdoor unit (leaves, grass, etc.).
3. Clean condenser coil with soft brush or low-pressure water spray (do not bend fins).
4. Straighten any bent fins with fin comb.
5. Check and clean drain lines annually.

CAUTION! Do not use high-pressure water on coils. Do not use chemical cleaners unless approved by manufacturer.

Regulatory Information

UL listed. Meets DOE energy efficiency standards. EPA Section 608 certified technicians required for refrigerant handling. Contains R-410A refrigerant which must be recovered/recycled. Manufactured to comply with applicable safety and performance standards. For technical support, contact American Standard Heating & Air Conditioning at 1-800-628-4516 or visit www.americanstandardair.com.

Troubleshooting

Diagnostic LED: Flashing pattern indicates specific fault codes (refer to service manual).

Service: 1-800-628-4516; www.americanstandardair.com