American Standard HVAC Heritage 18 Manual

The American Standard Heritage 18 is a high-efficiency residential air conditioning and heat pump system featuring the Climatuff® compressor, Spine Fin™ coil technology, and sound-reducing fan design. It operates with R-410A refrigerant, includes a 10-year limited warranty on the compressor and outdoor coil, and is designed for compatibility with American Standard matched indoor units for optimal performance. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Components 7. Operating Modes 8. Maintenance Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Outdoor condensing unit with Climatuff compressor, Spine Fin coil, low-sound fan, service valves, and electrical connections.

Feature	Description
Climatuff Compressor	Durable, single-stage compressor for reliable operation
Spine Fin Coil	Enhanced heat transfer and corrosion resistance
Sound Reduction Design	Quiet operation with specially designed fan and grille
R-410A Refrigerant	Environmentally friendly, non-ozone depleting
Service Valves	For easy installation and service access
Electrical Connection Box	Protected terminal block for line voltage and low-voltage wiring
High/Low Pressure Ports	For system pressure measurement and charging
Drain Port	For condensate removal in heat pump mode
Factory Installed Filter-Drier	Protects system from moisture and debris
Corrosion Protection	Weather-resistant paint and coatings

Installation

Unpack and inspect contents. Place on level, stable pad.

Position unit: Ensure minimum clearances (24" on sides, 48" above, 12" behind).
Connect refrigerant lines: Braze lines to service valves using nitrogen purge.
Connect electrical: Run line voltage (240V) and low-voltage thermostat wires per wiring diagram.
Connect condensate drain: Attach PVC piping for heat pump defrost drainage.
Evacuate and charge: Pull deep vacuum, charge with R-410A to specified weight.

WARNING! Installation must be performed by qualified HVAC technician. Disconnect all power before servicing.

First-Time Setup

Power on system; verify proper operation.

Check thermostat: Set to OFF, then COOL or HEAT mode with fan AUTO.
Verify airflow: Ensure indoor blower operates, check supply registers.
Check pressures: Measure high and low side pressures against charging chart.
Set dip switches: Configure for matched indoor unit type (furnace, air handler).
Test modes: Run cooling and heating cycles, check temperature drop/rise.

CAUTION! Ensure proper refrigerant charge for efficiency and compressor protection.

Specifications

Model Series: Heritage 18 (4A7A8).
SEER: Up to 18 SEER (cooling).
HSPF: Up to 9.5 HSPF (heat pump models).
Refrigerant: R-410A.
Compressor: Single-stage Climatuff.
Sound Level: As low as 72 dB.
Electrical: 208/230V, 1-phase, 60 Hz.
Operating Range: Cooling: 55°F to 115°F outdoor; Heating: -5°F to 65°F outdoor.
Warranty: 10-year limited on compressor and outdoor coil.

Controls and Settings

Operation controlled by compatible thermostat. Outdoor unit includes diagnostic LED.

Thermostat: Mode (COOL, HEAT, AUTO, OFF), Fan (AUTO, ON), Temperature Setpoint.

Dip Switches: Configure for indoor unit type, fan delay, thermostat type. Diagnostic LED: Flash codes for troubleshooting (1 flash = normal, 2 flashes = low pressure, etc.). Compressor Protection: Built-in time delay (5 minutes) and high/low pressure switches. Defrost Control: Automatic in heat pump mode based on time/temperature.

Connecting Components

Indoor Unit: Furnace or air handler. Thermostat: Compatible 24V control. Power: 240V circuit.

Turn off all power at disconnect and indoor unit.
Match wires per wiring diagram (Y, C, O/B, G, R, etc.).
Connect refrigerant lines with proper insulation.
Secure electrical connections with appropriate torque.

Tip: Use copper refrigerant lines only. Keep lines as short and straight as possible.

Operating Modes

Cooling, Heating (heat pump), and Fan Only modes.

Cooling: Thermostat calls for cooling, compressor and outdoor fan energize.
Heating: In heat pump models, reversing valve energizes for heating cycle.
Defrost: Heat pump automatically reverses to melt ice on outdoor coil.
Fan Only: Indoor blower operates without compressor.
Emergency Heat: Heat pump models allow auxiliary heat lockout.

WARNING! Do not operate system without proper airflow. Keep outdoor unit clear of debris.

Maintenance Features

Diagnostic LED: Provides fault codes for service. Service Ports: Standard 1/4" access ports for pressure measurement. Easy Access Panels: Removable panels for electrical and refrigerant components.

Care & Cleaning

Disconnect power before cleaning. Clean outdoor coil with water hose (no high pressure). Keep area around unit clear of vegetation and debris.

CAUTION! Do not use chemicals on coil fins. Do not bend fins during cleaning.

Regulatory Information

UL listed. Complies with DOE energy efficiency standards. Refrigerant handling requires EPA Section 608 certification. Manufactured by American Standard Heating & Air Conditioning. For support, visit www.americanstandardair.com or contact 1-800-628-4516.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Unit not running	Power, thermostat	Check disconnect, circuit breaker; verify thermostat settings.
Insufficient cooling/heating	Airflow, charge	Check filter, indoor blower; verify refrigerant charge.
Unit cycles on/off rapidly	Pressure switches	Check for restricted airflow, low/high pressure conditions.
Ice on outdoor coil (cooling)	Airflow, charge	Check indoor filter, blower; verify proper refrigerant charge.
Unusual noise	Fan, compressor	Check for loose parts, debris in fan; verify compressor mounting.

Reset: Turn power off for 5 minutes, then restore.

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