American Standard HVAC TWE018C14 Manual

The American Standard TWE018C14 is a high-efficiency residential air conditioning unit designed for reliable cooling performance. This manual covers the TWE018C14 model, featuring a 1.5-ton capacity, R-410A refrigerant, single-stage cooling, and compatibility with various American Standard furnaces and air handlers. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Outdoor Condenser Unit, Copper Refrigerant Lines, Electrical Disconnect Box, Thermostat Connection, Service Valves.

Installation

Unpack and inspect unit for shipping damage. Select a suitable outdoor location.

1. Site Preparation: Place on a level, stable pad (concrete or composite) with adequate clearance for airflow and service.
2. Electrical Connection: Install a properly sized outdoor electrical disconnect within sight of the unit. Connect power leads (L1, L2, Ground) per wiring diagram.
3. Refrigerant Lines: Connect pre-charged, insulated copper lineset from indoor unit to outdoor service valves. Brazing must be done with nitrogen purge.
4. Condensate Drain: Ensure indoor unit condensate line is properly connected and routed to drain.
5. Thermostat Wiring: Run low-voltage control wire (minimum 18 AWG) from indoor unit to outdoor unit and to thermostat location.

WARNING! Installation must be performed by a qualified HVAC technician in accordance with all national and local codes. Incorrect installation can cause property damage, personal injury, or death. Handle refrigerant lines with care to avoid kinks.

First-Time Setup & Startup

After installation, perform these steps for initial system commissioning.

1. Pre-Start Check: Verify all electrical connections are tight. Ensure refrigerant line service valves are fully open. Check that the indoor filter is clean and installed.
2. Thermostat Setup: Install batteries if required. Set thermostat to OFF. Configure basic settings (Fahrenheit/Celsius, fan AUTO/ON).
3. System Start: Turn power on at disconnect and indoor unit. Set thermostat to COOL mode and a temperature below room temp. The outdoor fan and compressor should engage.
4. Performance Check: Measure superheat/subcooling to verify correct refrigerant charge. Check temperature drop across indoor coil (typically 15-20°F). Listen for abnormal noises.
5. Finalize: Secure access panels. Review thermostat operation with homeowner.

CAUTION! Do not operate without proper refrigerant charge. Allow unit to sit powered off for at least 24 hours after moving to let refrigerant oil settle.

Specifications

• Model: TWE018C14
• Cooling Capacity: 18,000 BTU/h (1.5 Ton)
• Energy Efficiency Ratio (SEER): Up to 16
• Refrigerant Type & Charge: R-410A, Factory Pre-charged for specific lineset length
• Operating Voltage: 208/230V, 1-Phase
• Maximum Overcurrent Protection (MOCP): 20 Amps
• Minimum Circuit Ampacity (MCA): 15.0 Amps
• Compressor Rated Load Amps (RLA): 6.8 Amps
• Fan Motor Type: Permanent Split Capacitor (PSC)
• Liquid Line Connection: 3/8" SAE Flare
• Suction Line Connection: 3/4" SAE Flare
• Operating Ambient Temperature Range: 55°F to 115°F
• Sound Rating (Outdoor): As low as 72 dB
• Unit Weight: Approx. 125 lbs

Controls and Operation

Primary control is via a compatible thermostat (e.g., American Standard Comfort Control).

Thermostat Functions: POWER/System Switch (OFF, COOL, HEAT, AUTO), FAN Switch (AUTO, ON), Temperature Setpoints, Display.

Unit Operation:
Cooling Cycle: When thermostat calls for cooling, it energizes the contactor in the outdoor unit, starting the compressor and condenser fan. The indoor blower is simultaneously activated.
Fan Operation: In AUTO mode, indoor fan runs only during cooling cycle. In ON mode, fan runs continuously for air circulation.
Safety Controls: Unit includes high-pressure switch, low-pressure switch, compressor overload protection, and anti-short cycle timer (typically 5 minutes).

Connecting to Thermostat & System

Low-voltage connections (24VAC) are made at the indoor air handler/furnace control board.

1. Turn OFF all power to indoor and outdoor units.
2. At the indoor unit control board, identify terminals: R (24V Power), C (Common), Y (Compressor/Cooling), G (Fan).
3. Connect thermostat wires: R, C, Y, G from the thermostat to the corresponding terminals on the control board.
4. Run a 2-conductor wire from the Y and C terminals on the indoor board to the Y and C terminals on the outdoor unit contactor/control panel.
5. Restore power and test operation.

Tip: Use a compatible American Standard thermostat for full functionality. Refer to the thermostat installation guide for advanced wiring (heat pump, multi-stage, etc.).

Maintenance Procedures

Regular maintenance ensures efficiency, longevity, and warranty compliance.

1. Monthly: Check/replace indoor air filter. A dirty filter reduces airflow and efficiency.
2. Seasonal (Spring):
   • Inspect outdoor coil for debris (leaves, grass). Clean gently with a soft brush or low-pressure water from the inside out.
   • Ensure outdoor unit is level and clear of vegetation (min. 2 ft clearance).
   • Check refrigerant lines insulation for damage.
3. Annual (Professional Service):
   • Check refrigerant charge and system pressures.
   • Inspect electrical components for tightness and signs of overheating.
   • Check capacitor(s) for proper microfarad rating.
   • Clean indoor evaporator coil if accessible.
   • Verify condensate drain is clear.
   • Lubricate motors if required (most are permanently lubricated).

Safety Features

High-Pressure Switch: Cuts power to compressor if discharge pressure is excessively high.
Low-Pressure Switch: Cuts power to compressor if suction pressure is too low, indicating potential loss of charge.
Compressor Overload Protector: Internal thermal protection.
Anti-Short Cycle Timer: Prevents compressor from restarting for approximately 5 minutes after shutdown to protect it.
Fused Disconnect: Provides overcurrent protection at the outdoor unit.

Care & Cleaning

Outdoor Unit: Keep area clear. Wash coil annually with water only. Do not use pressure washers or harsh chemicals.
Indoor Unit: Replace filter regularly. Have professional clean evaporator coil as needed.
Cabinet: Wipe with a damp cloth. Do not use abrasive cleaners.

CAUTION! Always turn off electrical power at the disconnect before performing any cleaning or maintenance near the unit.

Regulatory Information

This product complies with applicable U.S. safety and performance standards. The refrigerant used (R-410A) is regulated by the EPA; recovery and handling must be performed by certified technicians. This equipment is designed for residential use. For technical specifications, warranty, and service information, visit www.americanstandardair.com or contact American Standard Customer Care.

Troubleshooting

Reset: Turn thermostat to OFF. Turn off power at disconnect for 1 minute. Restore power and reset thermostat.

Service: For all technical and warranty service, contact an authorized American Standard dealer. Do not attempt to repair refrigerant system components yourself.