American Standard HVAC TWG025A14 Manual

The American Standard TWG025A14 is a high-efficiency gas furnace designed for residential heating applications. This model features variable-speed blower technology, electronic ignition, 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 Requirements 3. First-Time Startup 4. Technical Specifications 5. Controls and Settings 6. Connecting to Thermostat 7. Operating Instructions 8. Maintenance Procedures 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Variable-speed ECM blower motor, electronic hot surface igniter, aluminized steel heat exchanger, multi-speed inducer motor, integrated control board.

Feature	Description
Variable-Speed Blower	Provides consistent airflow and improved efficiency
Electronic Ignition	Reliable hot surface ignition system
Aluminized Steel Heat Exchanger	Durable corrosion-resistant construction
Multi-Speed Inducer Motor	Quiet operation with precise combustion air control
Integrated Control Board	LED diagnostic lights for troubleshooting
Pressure Switch	Safety device to verify proper venting
Flame Sensor	Monitors burner flame for safety shutdown
Limit Switch	Prevents overheating by shutting off burners
Gas Valve	Precise gas flow regulation
Filter Rack	Standard 1-inch filter accommodation

Installation Requirements

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

Location: Install in approved location with proper clearances (minimum 1 inch from combustible materials).
Venting: Use approved PVC or metal vent pipe per local codes.
Gas Supply: Connect to proper gas line with shutoff valve; pressure test for leaks.
Electrical: Connect to 120V AC, 60Hz power source with proper grounding.
Drain Line: Install condensate drain line for high-efficiency operation.

WARNING! Installation must be performed by qualified HVAC technician. Gas appliances can be hazardous if improperly installed.

First-Time Startup

After installation, perform initial startup sequence.

Verify all connections: Gas, electrical, venting, and drain.
Install air filter: Ensure proper size and orientation.
Power on: Turn on electrical power and gas supply.
Thermostat setup: Set thermostat to heating mode and desired temperature.
Test operation: Observe ignition sequence and verify proper flame.
Check airflow: Ensure adequate airflow from all supply registers.

CAUTION! Never bypass safety devices. If furnace fails to start, consult troubleshooting section.

Technical Specifications

Model: TWG025A14
Input BTU/H: 60,000
Output BTU/H: 57,000
AFUE Rating: 95%
Gas Type: Natural Gas (convertible to LP with kit)
Electrical: 120V AC, 60Hz, 5 Amps
Blower Motor: Variable-speed ECM
Dimensions (HxWxD): 44" x 17.5" x 26"
Vent Size: 2" PVC (intake and exhaust)
Operating Temp Range: -30°F to 120°F ambient

Controls and Settings

Access control board via front panel. LED indicators show system status.

Control Board: POWER switch, LED diagnostic lights, DIP switch settings for blower speeds.

Thermostat Connections: R (24V power), W (Heat), G (Fan), C (Common). DIP Switch Settings: Adjust blower speeds for heating and cooling modes. Diagnostic LEDs: Flash codes indicate system status (normal operation = steady on, error = flashing pattern). Gas Valve Adjustment: Factory set; requires manometer for adjustment. Limit Switch: Auto-reset thermal protection.

Connecting to Thermostat

Compatible with most 24V thermostat systems including programmable and smart thermostats.

Turn off power at furnace and thermostat.
Remove thermostat cover and connect wires: R, W, G, C.
Match wire colors to terminal labels at furnace control board.
Restore power and test thermostat operation.

Tip: Use thermostat compatible with single-stage heating systems. For smart thermostats, may require C-wire connection.

Operating Instructions

Normal operation is controlled through thermostat.

Set thermostat to HEAT mode and desired temperature.
Furnace will initiate sequence: inducer motor starts, pressure switch closes, igniter heats, gas valve opens, flame sensor confirms ignition.
Blower starts after warm-up period (typically 30-90 seconds).
When thermostat satisfied, gas valve closes, blower continues for cool-down period.
For continuous fan operation, set thermostat to FAN ON position.

WARNING! Never adjust gas valve without proper training and equipment. Improper adjustment can create hazardous conditions.

Maintenance Procedures

Regular maintenance ensures efficiency and longevity.

Monthly: Check and replace air filter if dirty.
Annual: Professional inspection and cleaning.
Clean flame sensor with fine sandpaper or emery cloth.
Inspect heat exchanger for cracks or corrosion.
Check vent system for obstructions.
Verify condensate drain is clear.

Note: Some maintenance tasks require qualified technician.

Care & Cleaning

Turn off power before any cleaning. Keep area around furnace clear.

Exterior: Wipe with damp cloth. Interior: Vacuum dust from blower compartment annually. Burners: Clean only if obstructed (professional service recommended). Drain Line: Flush with water/vinegar solution annually.

CAUTION! Do not use water or cleaners on electrical components. Never block air intake or exhaust vents.

Regulatory Information

UL listed. ANSI Z21.47/CSA 2.3 certified. Meets U.S. Department of Energy efficiency standards. Manufactured to comply with applicable safety and performance standards. For technical support, contact American Standard at 1-800-428-4328 or visit www.americanstandardair.com. This product may be covered by limited warranty; see warranty certificate for details.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, switch	Check circuit breaker, thermostat settings, door switch.
No heat (blower runs)	Gas supply, ignition	Verify gas valve on, check igniter and flame sensor.
Short cycling	Filter, limit switch	Replace dirty filter, check for blocked vents or registers.
Blower won't stop	Thermostat setting	Check thermostat fan setting (should be AUTO not ON).
Error code flashing	System fault	Count flashes and refer to diagnostic chart in manual.
Unusual noises	Mechanical issues	Check for loose panels, blower wheel obstruction, inducer motor.
Condensate leak	Drain line blockage	Clear condensate drain line and trap.

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

Service: 1-800-428-4328; www.americanstandardair.com