American Standard HVAC TWG018A14 Manual

The American Standard TWG018A14 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.

Features at a Glance

Key components: Variable-speed ECM blower motor, Hot Surface Ignition (HSI), multi-speed inducer motor, integrated control board, flame sensor, and pressure switches.

Installation Requirements

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

1. Location: Install in approved location (closet, attic, basement, or garage) with proper clearances to combustibles.
2. Venting: Use approved PVC, CPVC, or ABS pipe for direct vent or concentric vent systems as per local codes.
3. Gas Supply: Connect to proper gas line with sediment trap; pressure test for leaks.
4. Electrical: Connect 120V AC power; ensure proper grounding.
5. Condensate Drain: Install drain line to suitable drain or condensate pump.

WARNING! Installation must be performed by a qualified technician in accordance with all local codes and ordinances. Gas furnaces can produce carbon monoxide.

First-Time Startup

After installation, perform initial startup sequence.

1. Verify all connections: Gas, electrical, venting, and drain.
2. Install clean air filter in filter rack.
3. Set thermostat to lowest setting.
4. Turn gas valve to ON position.
5. Restore electrical power to furnace.
6. Set thermostat to HEAT mode and raise temperature above room temp.
7. Observe ignition sequence and verify proper operation.
8. Check temperature rise and adjust blower speed if necessary.

CAUTION! Never bypass safety devices. Ensure proper ventilation during operation.

Specifications

• Model: TWG018A14
• Type: Upflow/Horizontal Gas Furnace
• Input BTU/hr: 60,000
• Output BTU/hr: 54,000
• AFUE Rating: 90%+
• Gas Type: Natural Gas (convertible to LP with kit)
• Electrical: 120V AC, 60Hz, 5 Amps
• Blower Motor: Variable-speed ECM
• Maximum External Static Pressure: 0.8 in. w.c.
• Vent Size: 2" PVC/CPVC
• Filter Size: 16x25x1 (standard)
• Dimensions (HxWxD): 44" x 17.5" x 21"

Controls and Settings

Access control board via front panel. Integrated control manages all furnace functions.

Control Board: LED diagnostic light, DIP switches for configuration, terminal strip for thermostat connections.

DIP Switch Settings: Heat staging, blower speeds, accessory configuration. Thermostat Connections: R (24V), C (Common), W/W1/W2 (Heat), G (Fan), Y/Y1/Y2 (Cool). Blower Speeds: Adjustable for heating and cooling modes via DIP switches or jumper wires. Gas Pressure: Factory set; adjustable with manometer if conversion performed.

Connecting to Thermostat

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

1. Turn off power to furnace at disconnect or circuit breaker.
2. Remove furnace front panel to access control board.
3. Connect thermostat wires to terminal strip: R, C, W, G, Y as needed.
4. Route thermostat cable through provided knockout.
5. Restore power and test thermostat operation.

Tip: Use a compatible thermostat with appropriate staging for optimal efficiency.

Operating Instructions

Furnace operates automatically based on thermostat settings.

1. Set thermostat to HEAT mode and desired temperature.
2. Furnace will initiate call for heat: inducer motor starts, pressure switches close, hot surface igniter glows, gas valve opens, burner ignites.
3. Blower starts after heat exchanger warm-up delay.
4. When thermostat satisfied, gas valve closes, burner extinguishes, blower continues for post-purge.
5. For continuous fan operation, set thermostat to FAN ON.
6. To shut down, set thermostat to OFF or lower temperature below room temp.

WARNING! Do not operate without filter installed. Ensure vents are not blocked.

Maintenance Procedures

Regular maintenance ensures efficiency and longevity.

1. Monthly: Check and replace air filter if dirty.
2. Annual (by qualified technician): Inspect heat exchanger, clean burners, check gas pressure, test safety controls, clean flame sensor, check vent system, lubricate inducer motor if required, check electrical connections, test ignition system.
3. Seasonal: Inspect condensate drain line and trap for blockages.

Note: Keep area around furnace clean and free of combustible materials.

Care & Cleaning

Turn off power and gas supply before cleaning.

Exterior: Wipe with damp cloth. Do not use abrasive cleaners. Burners: Vacuum gently if accessible. Flame Sensor: Clean with fine emery cloth if dirty. Condensate Trap: Flush with water/vinegar solution. Drain Line: Clear with nitrogen or compressed air if clogged.

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

Regulatory Information

ANSI Z21.47/CSA 2.3: Certified for safe operation. UL Listed: Electrical components. Energy Star: May qualify for energy efficiency programs depending on installation. Manufactured to comply with U.S. and Canadian standards. For support, contact American Standard Customer Service at 1-800-428-4328 or visit www.americanstandardair.com.

Troubleshooting

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

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