American Standard HVAC Odyssey TWA Series Manual

The American Standard Odyssey TWA Series is a high-efficiency, variable-speed air handler designed for use with compatible heat pump and air conditioning systems. It features durable construction, quiet operation, advanced humidity control, compatibility with communicating thermostats, multiple airflow settings, and integrated system diagnostics. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Variable-speed ECM blower motor, insulated cabinet, integrated control board, filter rack, condensate drain connection, and low-voltage terminal strip.

Installation

Unpack and inspect contents. Ensure installation location meets clearance requirements.

1. Select Location: Choose a level, indoor area (closet, attic, or utility room) with adequate service clearance.
2. Mount Unit: Secure to a stable platform or suspended from joists using appropriate hardware.
3. Connect Ductwork: Attach supply and return ducts securely; seal all joints with approved mastic or tape.
4. Electrical Connection: Connect line voltage (120V or 240V as specified) and low-voltage thermostat wiring per wiring diagram.
5. Condensate Drain: Install ¾-inch PVC line with proper trap and slope to drain.
6. Install Filter: Insert appropriate air filter into filter rack.

WARNING! Installation must be performed by a qualified HVAC technician in accordance with all local codes and ordinances. Disconnect all power before servicing.

First-Time Setup

Power on unit; configure settings via thermostat or onboard DIP switches.

1. System Power: Turn on electrical power at disconnect and circuit breaker.
2. Thermostat Configuration: If using a communicating thermostat, follow its setup wizard to identify the air handler.
3. Blower Settings: Configure default CFM/ton settings for cooling and heating via DIP switches on the control board (refer to manual chart).
4. Test Operation: Initiate a test cycle from the thermostat to verify cooling, heating, and fan operation.
5. Check Airflow: Verify airflow at supply registers and adjust DIP switches if necessary.
6. Inspect Drain: Pour water into drain pan to ensure condensate line is clear and draining properly.

CAUTION! Ensure all electrical connections are tight and correct before applying power. Verify refrigerant charge if connected to a split system.

Specifications

• Model Series: TWA (e.g., TWA036, TWA048, TWA060).
• Voltage: 208/230V, 1-Phase, 60 Hz (specific models may vary).
• Motor Type: Electronically Commutated Motor (ECM).
• Airflow Range: 350 to 1400 CFM (model dependent).
• Static Pressure Capability: Up to 0.8 inches w.c.
• Cabinet Insulation: 1-inch thick foam with foil facing.
• Filter Size: Accepts standard 16x25x1 inch filter (or as sized for unit).
• Dimensions (HxWxD): Approximately 49" x 21" x 21" (varies by model).
• Sound Rating: As low as 4.5 sones on low speed.
• Compatibility: Designed for use with matching American Standard heat pumps and AC condensing units.
• Refrigerant Type: R-410A.

Controls and Settings

Primary control is via the system thermostat. Onboard control board provides DIP switches for basic configuration and LED for diagnostics.

Thermostat Functions: Mode selection (Heat/Cool/Auto/Off), Fan (Auto/On), Temperature Setpoint, Humidity Setpoint (if equipped), System Status, Fault Code Display.

Onboard DIP Switches: Configure cooling airflow (CFM/ton), heating airflow % increase, continuous fan speed, dehumidification on/off, thermostat type (conventional/communicating).

Diagnostic LED: Steady on = normal operation. Flashing patterns indicate specific faults (e.g., 2 flashes = pressure switch error).

Connecting to Systems

Designed for split-system connection to an outdoor heat pump or air conditioner.

1. Turn off all power to indoor and outdoor units.
2. Connect Refrigerant Lines: Braze liquid and suction lines from outdoor unit to air handler coil connections. Use nitrogen purge during brazing.
3. Connect Low-Voltage: Run thermostat cable (minimum 18/5) from air handler terminal strip to thermostat. Connect Y, G, C, O/B, and R/W wires as per diagram.
4. Connect High-Voltage: Run line voltage supply from circuit breaker to air handler junction box. Connect ground, neutral, and hot wires.
5. Connect Condensate Drain: Install PVC line from drain pan to suitable drain. Include a P-trap.
6. Connect Outdoor Unit: Run low-voltage control wires and refrigerant lines between units.

Tip: Label all wires before disconnecting any existing equipment. Verify refrigerant line sizes per manufacturer specifications.

Operation Modes

Unit operates based on signals from the thermostat.

1. Cooling Mode: Activated by thermostat Y signal. ECM blower runs at preset cooling CFM. Enhanced dehumidification may slow blower if enabled.
2. Heating Mode (Heat Pump): Activated by thermostat Y and O/B signal (reversing valve). Blower runs at preset heating CFM (typically higher than cooling).
3. Emergency Heat (if equipped): Uses backup electric heat strips activated by W/W1 signal. Blower runs at high speed.
4. Fan-Only Mode: Activated by thermostat G signal. Blower runs at continuous fan speed set by DIP switches.
5. Auto Mode: Thermostat automatically switches between heating and cooling based on room temperature.

WARNING! Do not operate the unit without a proper air filter installed. Running without a filter can damage the coil and blower.

Maintenance Procedures

Regular maintenance ensures efficiency and longevity. Perform these tasks seasonally or as recommended.

1. Filter Replacement: Inspect monthly. Replace 1-inch filter every 1-3 months; replace media filter every 6-12 months.
2. Coil Inspection: Annually, visually inspect evaporator coil for dirt or debris. Clean with a soft brush if accessible.
3. Blower Inspection: Annually, check blower wheel for dust accumulation. Clean gently with a vacuum and soft brush.
4. Drain Line Maintenance: Annually, flush condensate drain line with a 50/50 mixture of water and vinegar to prevent algae clogs.
5. Electrical Check: Annually by a technician, check all electrical connections for tightness and signs of overheating.
6. Cabinet Inspection: Ensure cabinet panels are secure and insulation is intact.

Care & Cleaning

Turn off electrical power before any cleaning. Exterior cabinet can be wiped with a damp cloth. Do not use harsh chemicals or abrasives.

CAUTION! Never spray water or cleaners directly into the unit, electrical components, or air intakes. Ensure unit is completely dry before restoring power.

Regulatory Information

This product complies with applicable U.S. safety and performance standards. The ECM motor complies with U.S. Department of Energy regulations for energy efficiency. Manufactured by American Standard Heating & Air Conditioning, a division of Trane Technologies. For technical support, warranty information, or to locate a dealer, visit www.americanstandardair.com or contact 1-800-428-4322.

Troubleshooting

Reset: Some faults can be reset by turning power off for 30 seconds and then back on.

Service: For persistent issues, contact a qualified American Standard dealer. 1-800-428-4322; www.americanstandardair.com