American Standard HVAC Odyssey TTA2404 D Manual

The American Standard Odyssey TTA2404 D is a high-efficiency, two-stage, 4-ton gas furnace designed for residential heating applications. It features a variable-speed blower motor, durable aluminized steel heat exchanger, electronic ignition, integrated diagnostic controls, and compatibility with various thermostat systems for optimal comfort and energy savings. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

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

Features at a Glance

Key components: Two-stage gas valve, Variable-speed ECM blower motor, Aluminized steel primary heat exchanger, Stainless steel secondary heat exchanger, Integrated control board, Pressure switches, Ignition control, Flue outlet, Filter rack, Condensate drain connection.

Feature	Description
Two-Stage Heating	Provides high and low fire rates for improved comfort and efficiency
Variable-Speed Blower	ECM motor adjusts airflow for consistent temperature and quiet operation
Aluminized Steel Heat Exchanger	Durable construction for long service life
Electronic Ignition	Hot surface igniter for reliable, efficient startup
Integrated Diagnostics	LED status light and fault code display for easy troubleshooting
Filter Rack	Standard 1-inch or optional 4-inch media filter compatibility
Condensate Management	PVC drain connection for high-efficiency condensation removal
Multi-Speed Blower Taps	Adjustable cooling and heating airflow settings
Pressure Switch Safeties	Ensures proper venting before ignition
Flue Outlet	3-inch PVC vent connection for sidewall or roof venting

Installation

Unpack and inspect all components. Ensure proper clearances and location.

Select location: Install in conditioned space (attic, basement, closet, garage) with adequate clearance for service and combustion air.
Venting: Install PVC vent pipes per local codes; maintain proper slope for condensate drainage.
Gas connection: Use approved black iron pipe; install sediment trap; pressure test for leaks.
Electrical: Connect 120V AC power; ensure proper grounding; connect thermostat wiring.
Drain line: Connect condensate drain to suitable drain or condensate pump.
Ductwork: Connect supply and return ducts; seal all joints with mastic or foil tape.

WARNING! Installation must comply with all national and local codes. Only qualified HVAC technicians should install this furnace. Gas leaks can cause fire or explosion.

First-Time Setup

After installation, perform initial startup and configuration.

Power on: Turn on electrical power and gas supply.
Thermostat setup: Configure thermostat for two-stage heating and variable fan control if compatible.
Blower speed adjustment: Set heating and cooling airflow taps per installation requirements.
Test operation: Initiate heating cycle from thermostat; verify proper ignition, flame, and venting.
Check diagnostics: Observe control board LED for normal operation code (steady flash).
Measure temperature rise: Ensure rise is within range specified on rating plate.

CAUTION! Never bypass safety controls. Verify proper venting before leaving unit operational.

Specifications

Model: TTA2404 D
Heating Capacity: 80,000 BTU/hr Input, 64,000 BTU/hr Output
Efficiency (AFUE): Up to 80%
Stages: Two-stage gas valve
Blower Motor: Variable-speed ECM
Electrical: 120V AC, 60Hz, 7.5 amps
Gas Type: Natural Gas (convertible to LP with kit)
Gas Pressure: 3.5" WC Natural Gas, 10" WC LP
Vent Size: 3-inch PVC
Filter Size: 16x25x1 inch (standard), accepts media filters
Dimensions (HxWxD): 44" x 17.5" x 28"
Warranty: Limited lifetime heat exchanger, 5-year parts

Controls and Settings

Integrated control board manages all furnace operations. Access door switch must be engaged for operation.

Control Board LED: Flashes code for normal operation or fault diagnosis. Refer to label inside door for code chart.

DIP Switches: Located on control board for setting blower off delay, thermostat type, and other parameters.

Blower Speed Taps: Heating (HEAT), Cooling (COOL), and Continuous Fan (FAN) speed terminals for airflow adjustment.

Gas Valve: Two-stage operation controlled by thermostat W1 and W2 signals.

Thermostat Connections: Standard terminals: R, C, W1, W2, G, Y.

Connecting Thermostat

Compatible with most 24V thermostats, including programmable and smart models.

Turn off power to furnace at disconnect switch or breaker.
Remove furnace access panel to expose control board.
Connect thermostat wires to corresponding terminals: R (24V power), C (common), W1 (1st stage heat), W2 (2nd stage heat), G (fan), Y (cooling - if AC connected).
Use 18-gauge thermostat wire; ensure secure connections.
Restore power; configure thermostat for two-stage heating.

Tip: For optimal performance, use an American Standard compatible communicating thermostat.

Operation Modes

Furnace operates in heating, fan-only, or standby mode based on thermostat signals.

Heating Mode (Stage 1): Thermostat calls for heat on W1; furnace ignites on low fire; blower starts after heat exchanger warm-up delay.
Heating Mode (Stage 2): If demand continues, thermostat energizes W2; furnace switches to high fire for increased output.
Fan Mode: Thermostat G terminal energized; blower runs at continuous fan speed.
Cooling Mode: With AC system, Y terminal energized; blower runs at cooling speed.
Safety Shutdown: Control board monitors limit switches, pressure switches, and flame sensor; will shut down if fault detected.

WARNING! Do not operate furnace without filter installed. Restricted airflow can cause overheating and damage.

Maintenance Schedule

Regular maintenance ensures efficiency, reliability, and safety.

Monthly: Check filter; replace if dirty.
Annually (Before heating season): Professional inspection and cleaning recommended.
Professional Service Includes: Inspect heat exchanger, clean burners, check gas pressure, test safety controls, clean flame sensor, check vent system, lubricate blower if needed, check electrical connections, measure temperature rise, verify combustion.

Care & Cleaning

Turn off power and gas before any cleaning.

Filter: Replace 1-inch filter every 1-3 months; 4-inch media filter every 6-12 months.
Blower: Vacuum blower wheel and motor annually; ensure compartment is clean.
Flame Sensor: Gently clean with fine emery cloth if dirty (professional service).
Drain System: Flush condensate drain with water/vinegar solution annually to prevent algae.
Exterior: Wipe cabinet with damp cloth; keep area around furnace clear.

CAUTION! Never use water or cleaners on electrical components. Do not attempt to clean heat exchanger.

Regulatory Information

This furnace complies with ANSI Z21.47/CSA 2.3 standards. Installation must conform to National Fuel Gas Code (NFPA 54/ANSI Z223.1), National Electrical Code (NFPA 70), and all local building codes. For Canadian installations, comply with CSA B149.1 and Canadian Electrical Code. Manufactured by American Standard Heating & Air Conditioning, a division of Trane Technologies. For support, contact American Standard Customer Care at 1-800-926-9669 or visit www.americanstandardair.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power off, door switch, thermostat	Check breaker, ensure door closed, verify thermostat setting/batteries.
No heat (blower runs)	Gas supply, ignition	Check gas valve on; listen for igniter; check for fault code.
Furnace short cycles	Dirty filter, restricted vent	Replace filter; check vent pipes for blockage.
Blower runs continuously	Thermostat fan setting	Set thermostat from "ON" to "AUTO".
Error code flashing	System fault	Count LED flashes; refer to fault code chart inside door.
Unusual odors	Dust burning off, gas leak	New furnace may have brief odor; if gas smell, shut off gas and call professional.
Noisy operation	Loose parts, airflow	Tighten access panels; check for duct restrictions.

Reset: For lockout conditions, turn thermostat off, turn furnace power off for 60 seconds, then restore.

Service: For persistent issues, contact qualified HVAC technician. Do not attempt repairs beyond filter replacement unless qualified.