Carrier Performance 93 Gas Furnace Manual

The Carrier Performance 93 Gas Furnace is a high-efficiency residential heating system with 93% AFUE rating, variable-speed blower motor, two-stage gas valve operation, durable heat exchanger construction, quiet operation, diagnostic LED system, electronic ignition, and compatibility with various thermostat systems. Designed for reliable performance in cold climates with safety features including flame rollout switch, pressure switches, and high-temperature limit control. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Two-stage gas valve, variable-speed ECM blower motor, aluminized steel primary heat exchanger, stainless steel secondary heat exchanger, integrated control board, diagnostic LED, pressure switch connections, flame sensor, hot surface ignitor.

Installation Requirements

Professional installation required. Verify local codes and obtain permits.

1. Location: Install in dry, clean area with adequate combustion air and service clearance.
2. Gas Connection: Use black iron pipe; apply pipe joint compound on male threads only.
3. Electrical: 120V AC, 60Hz power supply with proper grounding.
4. Venting: PVC pipe system following manufacturer specifications for length and configuration.
5. Ductwork: Properly sized and sealed return and supply ducts.

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

Initial Startup

Professional startup procedure required for warranty validation.

1. Verify installation: Check all connections, venting, gas pressure, and electrical.
2. Gas pressure adjustment: Set manifold pressure to 3.5" WC for natural gas.
3. Blower speed settings: Adjust cooling and heating speeds per installation requirements.
4. System check: Test ignition sequence, safety controls, and temperature rise.
5. Customer orientation: Explain thermostat operation, filter maintenance, and safety features.

CAUTION! Never bypass safety controls. Always verify proper operation before leaving installation.

Technical Specifications

• AFUE Rating: 93%
• Input BTU/H: 40,000 to 120,000 (model dependent)
• Output BTU/H: 37,200 to 111,600 (model dependent)
• Gas Type: Natural gas (convertible to LP with kit)
• Electrical: 120V AC, 60Hz, 5-12 amps
• Blower Motor: Variable-speed ECM
• Static Pressure: 0.1 to 0.8 inches WC
• Venting: PVC, CPVC, or ABS (check local codes)
• Sound Rating: As low as 65 dBA
• Warranty: 20-year heat exchanger, 5-year parts

Controls and Operation

Integrated control board manages all furnace functions with LED diagnostic indicators.

Thermostat Connections: R (24V), C (Common), W/W1/W2 (Heat), G (Fan), Y/Y1/Y2 (Cool)

Operation Modes: Two-stage heating operation with variable blower speeds for optimal comfort and efficiency. Diagnostic LED: Flashes error codes for troubleshooting. Blower Control: Automatic delay on start and shutdown for improved comfort.

Venting System

Uses PVC pipe for direct vent operation. Follow specific requirements for pipe size and length.

1. Vent Pipe: 2" or 3" PVC, CPVC, or ABS depending on furnace size and run length.
2. Maximum Length: Consult installation manual for specific model limitations.
3. Termination: Maintain proper clearances from windows, doors, and air intakes.
4. Slope: Pitch condensate drain and vent pipes properly.

Tip: Always verify vent system integrity and proper drainage before operation.

Maintenance Procedures

Regular maintenance ensures optimal performance and safety.

1. Monthly: Check and replace air filter as needed.
2. Annual: Professional inspection and cleaning recommended.
3. Burner Inspection: Clean and verify proper flame pattern.
4. Heat Exchanger: Visual inspection for cracks or damage.
5. Blower Assembly: Clean blower wheel and housing.
6. Drain System: Clear condensate drain lines and trap.
7. Safety Controls: Test operation of all safety devices.

WARNING! Turn off electrical power and gas supply before performing any maintenance. Only qualified technicians should service internal components.

Safety Features

Multiple safety systems protect against hazardous conditions. Flame Rollout Switch: Detects flame outside burner compartment. Pressure Switches: Verify proper venting operation. High Limit Switch: Prevents overheating. Flame Sensor: Ensures gas valve closes if no flame detected. Ignition Control: Safely manages ignition sequence.

Cleaning & Care

Keep furnace area clean and clear of combustible materials. Use soft brush or vacuum for external cleaning.

CAUTION! Never use water or liquid cleaners on electrical components. Keep filter clean for proper airflow and efficiency.

Regulatory Information

UL listed and ANSI certified. Complies with U.S. Department of Energy efficiency standards. Manufactured to meet or exceed ASHRAE standards. For technical support, contact Carrier at 1-800-CARRIER or visit www.carrier.com. Copyright © 2025 Carrier Corporation. All rights reserved.

Troubleshooting Guide

Reset: Turn power off for 30 seconds, then restore to reset control board.

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