American Standard HVAC TTA1804 D Manual

The American Standard TTA1804 D is a high-efficiency residential gas furnace designed for reliable home heating. This model features variable-speed blower technology, quiet operation, and compatibility with various thermostat systems for optimal comfort control. Below are key sections covering safety, installation, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation Guidelines 3. First-Time Startup 4. Technical Specifications 5. Controls and Operation 6. Thermostat Connection 7. Maintenance Procedures 8. Safety Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Variable-speed ECM blower motor, aluminized steel heat exchanger, integrated control board, diagnostic LED, multi-speed inducer motor, and flue gas outlet.

Feature	Description
Variable-Speed Blower	Provides consistent airflow and quiet operation
Aluminized Steel Heat Exchanger	Corrosion-resistant for extended durability
Integrated Control Board	Manages system operation and diagnostics
Diagnostic LED	Displays error codes for troubleshooting
Multi-Speed Inducer Motor	Ensures proper venting and combustion
Flue Gas Outlet	Connects to vent pipe for exhaust gases
Gas Valve	Regulates natural or propane gas flow
Filter Rack	Standard 1-inch or 4-inch media filter compatible
Pressure Switch	Safety device verifying proper venting
Limit Switch	Prevents overheating by shutting off burners

Installation Guidelines

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

Position unit: Place on stable, level surface in approved location (closet, attic, or basement).
Connect gas line: Use black iron pipe with proper thread sealant; pressure test for leaks.
Install venting: Use approved PVC or metal vent pipe per local codes.
Electrical connections: Connect 120V power and thermostat wiring per wiring diagram.
Connect ductwork: Attach supply and return ducts securely.

WARNING! Installation must be performed by qualified HVAC technician. Gas leaks can cause explosion or fire.

First-Time Startup

After installation, perform initial startup sequence.

Verify all connections: Gas, electrical, venting, and ductwork.
Install air filter: Insert clean filter in filter rack.
Power on: Turn on electrical power and gas supply.
Set thermostat: Configure thermostat for heating mode and desired temperature.
Test operation: Observe ignition sequence and verify proper heating.
Check airflow: Ensure adequate airflow from all supply registers.

CAUTION! Do not operate without proper venting. Ensure combustion air supply is adequate.

Technical Specifications

Model: TTA1804 D
Input BTU/H: 80,000 BTU
Output BTU/H: 64,000 BTU
AFUE Rating: 80%
Gas Type: Natural gas (convertible to propane)
Electrical: 120V, 60Hz, 5.8 amps
Blower Motor: Variable-speed ECM
Dimensions (HxWxD): 40" x 21" x 26"
Vent Size: 3" PVC or metal
Operating Temp Range: -30°F to 150°F ambient

Controls and Operation

Primary control via thermostat. Integrated control board manages all functions.

Control Board LED: Steady green = normal operation. Flashing codes indicate specific issues (see troubleshooting).

Thermostat Settings: HEAT mode, COOL mode (with AC), FAN ON/AUTO. Blower Speeds: Adjustable for different heating stages. Gas Valve: Modulates flame for efficiency. Limit Switch: Auto-reset after cool-down.

Thermostat Connection

Compatible with most 24V thermostats. Standard connections: R (power), W (heat), G (fan), Y (cool), C (common).

Turn off power at furnace and breaker.
Remove access panel to expose control board.
Connect thermostat wires to corresponding terminals.
Secure wires and replace access panel.
Restore power and test thermostat operation.

Tip: Use 18-gauge thermostat wire for runs under 100 feet.

Maintenance Procedures

Regular maintenance ensures efficiency and longevity.

Monthly: Check and replace air filter if dirty.
Annual (by technician): Inspect heat exchanger for cracks.
Annual: Clean burners and check flame pattern.
Annual: Check gas pressure and adjust if needed.
Annual: Lubricate inducer motor if required (most are sealed).
Annual: Check all safety controls and switches.
Annual: Inspect vent system for obstructions.

WARNING! Gas components should only be serviced by qualified technician.

Safety Features

Multiple safety systems protect against hazardous conditions.

Safety Device	Function
Pressure Switch	Verifies inducer motor is creating draft before gas valve opens
Limit Switch	Shuts off burners if temperature exceeds safe limit
Flame Sensor	Detects flame; shuts off gas if no flame detected
Rollout Switches	Detects flame rollout; shuts off system immediately
Ignition Control	Provides safe ignition sequence with trial for ignition

Care & Cleaning

Turn off power and gas before cleaning. Use soft brush and vacuum only.

Exterior: Wipe with damp cloth; avoid water near electrical components.
Air filter: Replace every 1-3 months depending on usage.
Blower compartment: Vacuum dust annually when filter is removed.
Burners: Only clean when cold; use soft brush to remove debris.

CAUTION! Never use water or chemical cleaners on electrical components or burners.

Regulatory Information

UL listed and ANSI Z21.47 compliant. Meets U.S. Department of Energy efficiency standards. Manufactured to comply with all applicable safety codes. For technical support, contact American Standard at 1-800-628-8316 or visit www.americanstandardair.com. This product may be covered by limited warranty; see warranty certificate for details.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No heat	Thermostat setting, power, gas supply	Check thermostat setting; verify power and gas supply; check filter
Blower runs continuously	Thermostat fan setting	Set thermostat fan to AUTO instead of ON
Furnace short cycles	Dirty filter, blocked vent	Replace filter; check for vent obstructions
Unusual noises	Loose parts, motor issues	Check for loose panels; call for service if motor noise
LED flashing code	System fault	Count flashes and refer to fault code chart in manual
Pilot/ignition failure	Gas supply, igniter, sensor	Check gas valve; inspect igniter and flame sensor

Reset Procedure: Turn off power for 30 seconds, then restore. If problem persists, call for service.

Service: 1-800-628-8316; www.americanstandardair.com