American Standard HVAC 4A7A4018N Manual

The American Standard 4A7A4018N is a high-efficiency, single-stage, 1.5-ton air conditioner condenser unit designed for residential use. It features a durable, weather-resistant cabinet, a scroll compressor for quiet operation, a Spine Fin™ coil for enhanced heat transfer, and a single-speed fan. Compatible with American Standard matched indoor units for optimal performance. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Weather-resistant galvanized steel cabinet, Scroll Compressor, Spine Fin™ coil, Single-speed fan motor, Liquid and suction line service valves, High and low-pressure switches.

Installation

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

1. Location: Select a well-ventilated outdoor location away from windows, shrubs, and downspouts. Ensure minimum clearances per manual.
2. Pad: Place unit on a level, vibration-absorbing pad.
3. Refrigerant Lines: Connect pre-charged, insulated refrigerant linesets from indoor unit. Brazing must be done with nitrogen purge.
4. Electrical: Connect field-supplied power wiring (208/230V) to the unit's disconnect and terminal block. Follow local codes.
5. Control Wiring: Connect low-voltage thermostat wires (typically 24V) between indoor unit and outdoor unit terminal board.

WARNING! Installation must be performed by a qualified HVAC technician. Incorrect installation can cause property damage, personal injury, or death. Handle refrigerant according to EPA regulations.

First-Time Setup & Startup

After installation, the system must be commissioned by a technician.

1. Leak Check & Evacuation: Check all connections for leaks. Evacuate the refrigerant circuit to remove moisture and non-condensables.
2. Charge the System: Weigh in the correct amount of R-410A refrigerant as specified on the unit rating plate and installation guide.
3. Electrical Check: Verify correct voltage at the unit. Check amp draw of compressor and fan against specifications.
4. Startup & Test: Power on the system at the thermostat. Check for proper cooling operation, temperature drop, and cycle times.
5. Final Settings: Set thermostat cooling setpoint, fan mode (AUTO/ON), and program schedule if applicable.

CAUTION! Do not operate the unit without the service access panels securely in place. Ensure the condenser coil is free of debris before startup.

Specifications

• Cooling Capacity: 18,000 BTU/h (1.5 Tons).
• SEER Rating: Up to 16 SEER (depending on matched indoor unit).
• Refrigerant Type: R-410A.
• Operating Voltage: 208/230V, 1 Phase, 60 Hz.
• Electrical Data: Minimum Circuit Ampacity (MCA) and Maximum Overcurrent Protection (MOCP) as listed on rating plate.
• Sound Level: [Specific dB(A) rating to be inserted from product data].
• Operating Ambient Temp: 55°F to 115°F (13°C to 46°C) for cooling.
• Dimensions (L x W x H): Approx. [Insert dimensions] inches.
• Net Weight: Approx. [Insert weight] lbs.

Controls and Operation

Primary control is via the indoor thermostat. The outdoor unit has internal safeties and a control board.

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

Unit Operation: When thermostat calls for cooling, it sends a 24V signal to the outdoor unit, engaging the contactor. The compressor and fan start after a short time delay.

Internal Safeties: Unit includes high-pressure switch, low-pressure switch, compressor overload protection, and time-delay circuitry to prevent short cycling.

Connecting to Indoor Unit & Thermostat

This is a split system. The outdoor unit must be connected to a matched indoor coil (for cooling only) or furnace/air handler (for cooling and heating).

1. Turn off all power at the disconnect and indoor unit before making any connections.
2. Run the two-conductor high-voltage power wires and the multi-conductor low-voltage control wire (typically 18/5 or 18/7) between the indoor and outdoor units in separate conduits.
3. Connect wires to the terminal boards as shown in the wiring diagram on the unit's access panel.
4. Connect the thermostat to the indoor unit's control board following its manual.

Tip: Label all wires before disconnecting. Use a wiring diagram specific to your matched system.

Maintenance Procedures

Regular maintenance is required for efficiency and longevity. Some tasks require a technician.

1. Monthly (Homeowner): Visually inspect the outdoor unit. Ensure it is clear of leaves, grass clippings, snow, and shrubs (maintain 24-inch clearance).
2. Annually (Technician):
   • Inspect electrical connections for tightness and corrosion.
   • Check refrigerant charge and system pressures.
   • Clean the outdoor coil with a soft brush and gentle water spray (power off).
   • Check and clean the indoor coil and drain line.
   • Lubricate motors if required (most are permanently lubricated).
   • Check fan blade and motor for wear.

WARNING! Always disconnect power before performing any inspection or maintenance. Do not attempt to clean the coil with high-pressure water or insert objects into the fan area.

Safety Features

High-Pressure Switch: Shuts off compressor if discharge pressure is excessive. Low-Pressure Switch: Shuts off compressor if suction pressure is too low (indicative of low charge or restriction). Compressor Internal Overload: Protects against overheating. Time-Delay Relay: Prevents compressor from restarting for approximately 5 minutes after shutdown to protect it.

Care & Cleaning

Disconnect power at the outdoor disconnect switch before cleaning.

Coil Cleaning: Gently brush debris from the coil fins. Rinse with a garden hose from the inside out. Do not use a pressure washer.

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

Winter (Off-Season): Consider using a waterproof cover, but ensure it does not trap moisture or restrict airflow at the bottom. Remove cover before operating.

CAUTION! Never operate the unit without the fan grille in place. Keep the top discharge area completely unobstructed.

Regulatory Information

This product complies with applicable U.S. safety and performance standards. The refrigerant system contains R-410A. Federal law requires that the servicing of this appliance be performed by a technician certified in the safe handling of refrigerants. For warranty service, contact an authorized American Standard dealer. For support, visit www.americanstandardair.com or contact American Standard Customer Care.

Troubleshooting

Reset: Some faults may be reset by turning off power at the disconnect for 5 minutes, then restoring power.

Service: For all repairs, contact a qualified American Standard HVAC dealer. Do not attempt to repair refrigerant circuit or electrical components yourself.