American Standard HVAC 4A7A4024N Manual

The American Standard 4A7A4024N is a high-efficiency, 2-ton, 14 SEER residential air conditioner condensing unit designed for quiet operation and reliable cooling. It features a durable, weather-resistant cabinet, a scroll compressor for efficiency and reliability, and is compatible with American Standard matched indoor units for optimal system performance. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: Weather-resistant galvanized steel cabinet, High-efficiency scroll compressor, Copper tube/aluminum fin coil, Liquid line filter-drier, Service valves, Low-pressure switch, High-pressure switch.

Installation

Unpack and inspect contents. Place on a level, stable pad (concrete recommended).

1. Location: Select a well-ventilated outdoor location with adequate clearance (min 24" on all sides, 48" above). Ensure proper drainage.
2. Pad: Place unit on a solid, level pad that extends 2" beyond cabinet on all sides.
3. Refrigerant Lines: Connect pre-charged, insulated refrigerant lineset from indoor unit. Brazing must be done with nitrogen purge.
4. Electrical: Connect proper gauge field-supplied power wiring to disconnect box, then to unit terminal block (L1, L2). Connect low-voltage thermostat wires (Y, C) from indoor unit.
5. Condensate Drain: Ensure indoor unit condensate line is properly installed and draining.

WARNING! Installation must be performed by a qualified HVAC technician in accordance with all local codes and the National Electrical Code (NEC). Disconnect all power before servicing.

First-Time Setup & Startup

After installation, perform initial startup and system check.

1. Pre-Start Check: Verify all electrical connections are tight. Ensure refrigerant lines are connected, insulated, and not kinked. Check that service valves are fully open.
2. Thermostat Setup: Set system mode to COOL and fan to AUTO. Set temperature below room temperature to initiate cooling call.
3. Power On: Restore power at disconnect and indoor unit.
4. Operation Check: Listen for compressor and fan start-up. Verify cool air is delivered from indoor vents. Check for proper condensate drainage.
5. Measurements: Technician should measure superheat/subcooling, system pressures, and voltage/amperage to ensure proper charge and operation.

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

Specifications

• Model Number: 4A7A4024N
• Cooling Capacity: 24,000 BTU/H (2 Tons)
• SEER Rating: Up to 14 SEER (with matched indoor unit)
• Refrigerant Type: R-410A
• Refrigerant Charge (Factory): See unit nameplate
• Electrical Data: 208/230V, 1 Phase, 60 Hz (Refer to nameplate for Min Circuit Ampacity and Max Fuse Size)
• Fan Motor: PSC, HP as specified on nameplate
• Operating Ambient Temp Range: 55°F to 115°F (13°C to 46°C)
• Sound Rating: As per AHRI standards (check spec sheet)
• Net Weight: Approx. 150 lbs (68 kg) - verify on unit
• Dimensions (L x W x H): Approx. 31" x 31" x 26"

Controls and Settings

Primary control is via the indoor thermostat. Unit has internal protective controls.

Thermostat Settings: MODE (COOL, OFF, HEAT* if heat pump), FAN (AUTO, ON), TEMPERATURE SETPOINT.

Unit Internal Controls:

• High-Pressure Switch: Opens on excessive discharge pressure, shutting off compressor.
• Low-Pressure Switch: Opens on low suction pressure, shutting off compressor.
• Compressor Overload Protector: Internal thermal protection.
• Time Delay Relay: Prevents compressor short-cycling (approx. 5-minute delay).

No User-Adjustable Settings: All system adjustments (charge, fan speed) must be performed by a qualified technician.

Connecting to Indoor Unit & Thermostat

This is a split system. Requires connection to an indoor coil (evaporator) and a thermostat.

1. Indoor Unit: Must be a matched American Standard evaporator coil or fan coil.
2. Refrigerant Lines: Connect vapor (suction) and liquid lines between outdoor and indoor units. Must be leak-tight, properly sized, and insulated.
3. Condensate Drain: Connect PVC drain line from indoor coil drain pan to suitable drain.
4. Thermostat: Connect low-voltage wires (typically R, C, Y, G, W/W1*) from indoor unit control board to thermostat sub-base.
5. Power: Supply 208/230V power to outdoor unit via a field-supplied disconnect.

Tip: Label all wires during installation for easier future service.

Operation & Maintenance

For normal operation, use the thermostat. Regular maintenance is crucial for efficiency and longevity.

1. Seasonal Startup: Clear debris from around unit. Ensure coil is clean. Turn on power.
2. Routine Operation: Set thermostat to desired temperature. System will cycle automatically.
3. Filter Maintenance: Replace or clean indoor air filter monthly during cooling season.
4. Annual Professional Service: Schedule a technician annually to:
   • Inspect and clean condenser and evaporator coils.
   • Check refrigerant charge and system pressures.
   • Inspect electrical components and connections.
   • Check condenser fan motor and blades.
   • Verify condensate drain is clear.
5. Winterization (Cold Climates): Consider installing a weather-protective cover to keep debris out. Do not run in cooling mode when outdoor temps are below 55°F.

WARNING! Always turn off power at the disconnect before performing any maintenance near the unit. Do not attempt to service refrigerant components.

Safety Features

High and Low-Pressure Switches: Protect compressor from abnormal operating conditions. Compressor Internal Overload: Protects against overheating. Time Delay: Protects compressor from short cycling. Fuses/Circuit Breakers: Provide branch circuit protection (field supplied).

Care & Cleaning

Homeowner: Keep area around unit clear of leaves, grass, shrubs (min 24" clearance). Gently rinse condenser coil from the inside out with a garden hose (power OFF) if visibly dirty.

Technician: Use commercial coil cleaner for heavy dirt. Straighten bent fins with a fin comb. Lubricate fan motor bearings per manufacturer instructions if not permanently sealed.

CAUTION! Do not use a pressure washer, as it can bend fins and damage the coil. Do not clean while unit is operating.

Regulatory Information

This product complies with applicable U.S. safety and performance standards. The refrigerant, R-410A, is regulated by the EPA Section 608. Only EPA-certified technicians may service the refrigerant circuit. Proper recovery and recycling of refrigerant is required by law. For support, contact your installing American Standard dealer or visit www.americanstandardair.com.

Troubleshooting

Reset: If unit locks out on safety, turn thermostat OFF, turn power OFF at disconnect for 5 minutes, then restore power and thermostat.

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