Carrier Gas Furnace Model 58CTW090 Manual

The Carrier 58CTW090 is a high-efficiency gas furnace with variable-speed blower motor, multi-speed operation, and advanced diagnostic capabilities. This 90,000 BTU furnace features electronic ignition, sealed combustion, and compatibility with various thermostat systems. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Variable-speed blower motor, electronic ignition system, sealed combustion chamber, multi-position installation capability, integrated diagnostic LED.

Installation Requirements

Professional installation recommended. Verify local codes and obtain permits.

1. Location: Install in dry, clean area with adequate clearance for service access.
2. Venting: Use approved PVC pipe for combustion air and flue gas.
3. Gas connection: Use black iron pipe with proper thread sealant.
4. Electrical: 120V AC power supply with proper grounding.
5. Ductwork: Ensure proper sizing and sealing for optimal airflow.

WARNING! Gas furnaces produce carbon monoxide. Proper installation and venting are critical for safety. Only qualified technicians should perform installation.

First-Time Setup

Initial startup must be performed by qualified technician.

1. Verify all connections: Gas, electrical, venting, and ductwork.
2. Check gas pressure: Adjust manifold pressure to specifications.
3. Configure blower speeds: Set cooling and heating speeds per requirements.
4. Test operation: Verify ignition sequence and temperature rise.
5. Program thermostat: Set up heating schedule and temperature settings.

CAUTION! Never operate furnace without proper venting. Ensure combustion air openings are unobstructed.

Technical Specifications

• Heating Capacity: 90,000 BTU/h input
• Efficiency: Up to 96% AFUE
• Gas Type: Natural gas (convertible to LP with kit)
• Electrical: 120V AC, 60Hz, 5.0 amps
• Blower Motor: Variable-speed ECM
• Airflow: 1,200-1,600 CFM
• Venting: 2" PVC pipe required
• Dimensions: 21" W x 45" H x 26" D
• Weight: 125 lbs
• Sound Rating: Ultra-quiet operation

Controls and Settings

Integrated control board with diagnostic capabilities. Access via control panel or thermostat.

Control Board: LED status light, dip switches for configuration, reset button.

Configuration: Blower speeds (COOL, HEAT), fan on/off delays, accessory options. Diagnostic: LED flash codes indicate system status and fault conditions. Temperature: Controlled via compatible thermostat with appropriate wiring.

Connecting Thermostat

Compatible with most 24V thermostats. Professional installation recommended.

1. Turn off power to furnace at disconnect switch.
2. Remove control panel to access thermostat terminals.
3. Connect wires: R (24V), W (heat), G (fan), C (common).
4. Secure connections and replace control panel.
5. Restore power and test thermostat operation.

Tip: Use thermostat with appropriate staging capability for optimal performance.

Operation Instructions

Normal operation is automatic via thermostat control.

1. Set thermostat to desired temperature above room temperature.
2. Furnace will initiate startup sequence: inducer motor, pressure switch verification, igniter warm-up, gas valve opening.
3. Once ignition is verified, main blower will start after brief delay.
4. Furnace will run until thermostat satisfaction, then shut down in reverse sequence.
5. Fan may continue running briefly to extract residual heat.

WARNING! If you smell gas, turn off gas supply immediately and call qualified service technician. Do not operate electrical switches.

Maintenance Schedule

Annual professional maintenance recommended. Monthly homeowner checks.

Monthly: Check air filter, replace if dirty. Ensure vents are unobstructed.

Annual (Professional): Clean heat exchanger, check burners, verify gas pressure, inspect vent system, test safety controls, lubricate motor if required.

Safety Features

Multiple safety systems protect against hazardous conditions.

• Flame rollout switches: Detect improper burner operation
• High limit switches: Prevent overheating
• Pressure switches: Verify proper venting
• Ignition control: Monitors flame presence
• Blower door switch: Prevents operation with door removed

CAUTION! Never bypass safety controls. Always investigate cause of safety shutdown.

Regulatory Information

UL certified. Meets ANSI Z21.47 standards. CSA design-certified. This product complies with appropriate safety and performance standards. Installation must comply with local building codes and National Fuel Gas Code. For technical support, contact Carrier at 1-800-CARRIER or visit www.carrier.com.

Troubleshooting

Reset: Turn power off for 30 seconds, then restore. Check LED diagnostic codes.

Service: 1-800-CARRIER; www.carrier.com