American Standard HVAC 2A6H8048A Manual

The American Standard 2A6H8048A is a high-efficiency residential air conditioning condenser unit, part of the AccuComfort™ Platinum 20 series. It features a two-stage compressor for enhanced comfort and efficiency, compatibility with variable-speed air handlers, a durable WeatherGuard™ top, a sound-reducing fan, and a louvered coil guard. Designed for use with R-410A refrigerant, it meets ENERGY STAR® requirements. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup & Startup 4. Specifications 5. Controls and Operation 6. Connecting to Thermostat & Air Handler 7. Maintenance Procedures 8. Error Codes & Diagnostics 10. Care & Cleaning 11. Regulatory Information 12. Troubleshooting

Features at a Glance

Key components: Two-stage scroll compressor, WeatherGuard™ protective top, Sound reduction system, Louvered coil guard, Service valve access panel, Electrical disconnect location.

Feature	Description
Two-Stage Operation	Provides high and low cooling stages for better humidity control and efficiency
WeatherGuard™ Top	Protects internal components from weather and debris
Quiet Operation	Sound-reducing fan and compressor mounting for low decibel levels
Louvered Coil Guard	Protects aluminum coil while allowing optimal airflow
R-410A Refrigerant	Environmentally friendly, non-ozone depleting refrigerant
High SEER Rating	Exceeds 20 SEER for significant energy savings
Compatibility	Designed to work with variable-speed American Standard air handlers/furnaces
Diagnostic LED	Provides visual fault code indication on control board
Service Valves	Easy-access liquid and suction line valves for installation and service
Corrosion Protection	Paint and coating designed for resistance to harsh environments

Installation

Unpack and inspect contents. Place on a level, stable pad away from obstructions.

Site Preparation: Install on a level concrete pad or approved composite stand. Ensure minimum clearances (24" on all sides, 48" above).
Electrical Connection: Install a properly sized disconnect switch within sight of the unit. Connect line voltage wiring to the contactor per the wiring diagram.
Refrigerant Lines: Connect pre-charged, insulated refrigerant linesets from the air handler. Braze connections using nitrogen purge.
Control Wiring: Run low-voltage thermostat cable (minimum 18 AWG) between the indoor unit and the condenser's control board.
Final Check: Ensure all electrical connections are tight, service valves are open, and the unit is level.

WARNING! Installation must be performed by a qualified HVAC technician in accordance with all national and local codes. Incorrect installation can cause property damage, personal injury, or death. Disconnect all power before servicing.

First-Time Setup & Startup

After installation, power on the system and perform initial commissioning.

Power Up: Turn on power at the disconnect switch and indoor unit.
Thermostat Configuration: Set compatible thermostat to "Cool" mode. Configure for two-stage operation if required.
System Check: Initiate a cooling cycle. Verify the condenser fan and compressor start. Listen for unusual noises.
Performance Verification: Measure superheat and subcooling to confirm correct refrigerant charge. Check supply and return air temperature drop (typically 15-20°F).
Diagnostic Check: Observe the LED on the control board for normal flash pattern (steady blink indicating no faults).

CAUTION! Do not operate the unit without the fan guard and top cover in place. Ensure the refrigerant charge is correct before extended operation.

Specifications

Model Number: 2A6H8048A
Cooling Capacity: 48,000 BTU/H (4 Tons)
SEER Rating: Up to 21.5 SEER
Refrigerant Type: R-410A
Electrical Data: 208/230V, 1 Phase, 60 Hz. Minimum Circuit Ampacity: 26.1 A. Max Fuse/Breaker: 40 A.
Compressor: Two-stage scroll type with sound insulation
Fan Motor: Permanent Split Capacitor (PSC) or ECM (varies), weather-protected
Operating Ambient Temp: 55°F to 115°F (13°C to 46°C)
Sound Level: As low as 72 dB(A)
Dimensions (approx.): 35" H x 31" W x 31" D
Net Weight: Approx. 245 lbs

Controls and Operation

Operation is primarily controlled by a compatible thermostat. The unit's internal control board manages staging, timers, and safety locks.

Thermostat Control: Use a compatible two-stage thermostat. Y1 terminal activates low stage, Y2 activates high stage. G controls indoor fan.

Unit Control Board: Manages compressor short-cycle protection, fault monitoring, and diagnostic LED codes. No user-adjustable settings are on the outdoor unit.

Normal Operation: The unit will run in low stage (approx. 67% capacity) for moderate cooling and humidity removal. It will engage high stage during high demand or if low stage cannot satisfy the thermostat.

Safety Features: Includes high and low-pressure switches, compressor overload protection, fan time delay, and anti-short cycle timer (typically 5 minutes).

Connecting to Thermostat & Air Handler

Proper low-voltage wiring is critical for two-stage operation.

Turn off all power to the indoor and outdoor units.
At the indoor air handler/furnace control board, locate terminals: R, C, Y1, Y2, G, W (if heat), O/B (if heat pump).
Run a 5-8 conductor thermostat cable from these terminals to the outdoor unit's control board.
At the outdoor unit, connect the corresponding wires to the terminals on the control board (typically labeled Y1, Y2, C, R).
Connect a separate wire from the 'C' terminal at the indoor unit to the 'C' terminal at the outdoor unit to provide 24V power.
Select the correct thermostat configuration for "2-stage conventional cooling."

Tip: Refer to the wiring diagram located on the inside of the condenser's service panel door for specific terminal designations.

Maintenance Procedures

Regular maintenance ensures efficiency and longevity. Perform at least annually, preferably before the cooling season.

Power Off: Turn off power at the disconnect switch.
Clean Condenser Coil: Remove the top grille and louvered guard. Use a soft brush or low-pressure water spray to clean debris from the aluminum fins. Straighten any bent fins with a fin comb.
Clear Area: Remove leaves, grass, and debris from around the unit (maintain 24" minimum clearance).
Check Electrical: Inspect wiring for damage or corrosion. Ensure connections at the contactor and capacitor are tight.
Inspect Fan & Motor: Ensure the fan blades are clean and undamaged. Check for smooth bearing operation.
Check Refrigerant Lines: Inspect insulation and look for signs of oil leaks at fittings.
Restart & Verify: Restore power and verify normal operation.

WARNING! Only a qualified technician should check refrigerant charge, electrical components under load, or perform repairs involving the sealed system.

Error Codes & Diagnostics

The control board LED flashes to indicate status and faults.

LED Flash Pattern	Description	Possible Cause
Steady Blink (1/sec)	Normal Operation / No Call for Cool	System is ready.
2 Flashes, Pause	Low Pressure Lockout	Refrigerant leak, restriction, faulty sensor.
3 Flashes, Pause	High Pressure Lockout	Dirty coil, restricted airflow, overcharge, faulty fan.
4 Flashes, Pause	Compressor Overload Open	Electrical issue, failing compressor, low voltage.
5 Flashes, Pause	Faulty Outdoor Coil Temp Sensor	Open or short in sensor circuit.
Continuous On	Control Board Fault / Power Issue	Check 24V transformer and board power.

Reset: Most lockouts will auto-reset after a set period (e.g., 1 hour) if the fault condition clears. Power cycling the unit may also reset non-latching faults.

Care & Cleaning

Keep the unit clean and unobstructed for optimal performance.

Monthly: Visually inspect for debris around the unit. Gently remove leaves or grass clippings from the exterior louvers.

Seasonally: Perform the full maintenance cleaning as described in Section 8.

Winter (if unused): Consider using a waterproof cover designed for condensers to protect from ice and debris. Ensure the cover is breathable to prevent moisture buildup.

CAUTION! Never use a pressure washer to clean the coil, as it will bend the fins. Do not use chemical cleaners unless specifically approved for aluminum coils. Always disconnect power before any cleaning.

Regulatory Information

This equipment is designed to comply with applicable U.S. safety standards (UL/CSA). The refrigerant circuit contains R-410A, a non-ozone-depleting HFC. Proper recovery and recycling of refrigerant is required by EPA Section 608 regulations. This unit incorporates safety devices intended to prevent unsafe operation. Tampering with or bypassing safety controls is prohibited. For technical specifications, warranty, and service information, contact American Standard Heating & Air Conditioning or visit www.americanstandardair.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Unit does not start	No power, thermostat issue, safety lockout	Check disconnect switch and breaker. Verify thermostat settings and batteries. Check diagnostic LED for fault code.
Fan runs, compressor does not	Capacitor failure, contactor issue, compressor overload	Check capacitor with multimeter. Listen for contactor click. Check for 240V at compressor terminals. Allow time for overload reset.
Compressor runs but trips on high pressure	Dirty condenser coil, restricted airflow, overcharge	Clean condenser coil. Ensure fan is operating at correct speed. Have technician check refrigerant charge.
Insufficient cooling	Dirty air filter, low refrigerant, restricted ductwork	Replace indoor air filter. Have technician check charge and superheat/subcooling. Check for closed supply vents.
Unit is noisy	Loose parts, debris in fan, failing motor bearings	Turn off power and check for loose screws, panels, or debris touching fan. Listen for bearing grind.
Ice on refrigerant lines or coil	Low airflow, low refrigerant charge	Replace dirty air filter. Check indoor fan operation. Have technician check for refrigerant leak.

Service Note: For all sealed system (refrigerant) issues, electrical component replacement beyond the contactor/capacitor, or persistent fault codes, contact a qualified American Standard dealer.

Customer Support: 1-800-428-4326; www.americanstandardair.com