bryant 90 furnace manual

The Bryant 90 furnace is a high-efficiency gas furnace series designed for residential heating applications. With AFUE ratings up to 98%, these furnaces feature variable-speed blower motors, two-stage gas valves, durable heat exchangers, and advanced diagnostic systems. 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, durable aluminized steel heat exchanger, integrated control board, pressure switches, flame sensor, and diagnostic LED.

Installation Requirements

Unpack and inspect all components. Ensure proper clearances and location requirements.

1. Location: Install in approved locations with proper clearances to combustibles.
2. Venting: Use approved PVC or CPVC pipe for direct vent installation.
3. Gas connection: Use black iron pipe with proper thread sealant.
4. Electrical: Connect to 120V AC power with proper grounding.
5. Ductwork: Ensure proper sizing and sealing of supply and return ducts.

WARNING! Gas furnaces produce carbon monoxide; proper installation is critical for safety. Installation must comply with local codes.

First-Time Setup

Complete installation verification and initial startup procedure.

1. Gas pressure check: Verify inlet and manifold gas pressures are correct.
2. Venting verification: Confirm proper draft and vent pipe installation.
3. Electrical connections: Check all wiring for proper connections.
4. Thermostat setup: Install compatible thermostat and configure settings.
5. Initial startup: Follow lighting instructions and verify proper operation.

CAUTION! Only qualified HVAC technicians should perform installation and startup procedures.

Technical Specifications

• AFUE Rating: Up to 98% efficiency
• Input Capacity: 40,000 to 120,000 BTU/h models available
• Stages: Two-stage heating operation
• Blower Type: Variable-speed ECM motor
• Gas Type: Natural gas or LP (with conversion kit)
• Voltage: 120V AC, 60Hz
• Venting: PVC or CPVC direct vent system
• Filter Size: Standard 1-inch or optional 4-inch media
• Sound Level: As low as 65 dB operation

Controls and Settings

Integrated control board manages all furnace operations with diagnostic capabilities.

Thermostat: Compatible with single-stage, two-stage, and smart thermostats. Control board: Monitors safety devices, manages blower operation, displays error codes via LED.

Heating stages: Low-fire for mild weather, high-fire for extreme cold. Blower speeds: Multiple speeds for heating and continuous fan operation. Diagnostic codes: LED flash patterns indicate specific error conditions for troubleshooting.

Venting and Combustion Air

Direct vent system using PVC pipe for both intake and exhaust.

1. Vent pipe: Use only approved PVC or CPVC pipe materials.
2. Termination: Locate vent terminals according to clearance requirements.
3. Slope: Ensure proper slope for condensate drainage from horizontal runs.
4. Combustion air: Provide adequate fresh air for proper combustion.

Tip: Regular inspection of vent system is essential for safe operation.

Operating Instructions

Normal operation through thermostat control.

1. Thermostat setting: Set desired temperature on compatible thermostat.
2. Automatic operation: Furnace will cycle between low and high fire as needed.
3. Continuous fan: Optional continuous blower operation for air circulation.
4. Seasonal shutdown: Follow proper procedures for seasonal non-use periods.

WARNING! Never operate furnace with access panels removed. Keep area around furnace clear of combustible materials.

Maintenance Procedures

Regular maintenance ensures optimal performance and safety.

1. Filter replacement: Change filters every 1-3 months depending on usage.
2. Annual inspection: Have qualified technician perform annual maintenance.
3. Heat exchanger: Visual inspection for cracks or damage.
4. Blower cleaning: Clean blower wheel and housing as needed.
5. Flame sensor: Clean annually to ensure proper operation.

CAUTION! Always turn off electrical power and gas supply before performing any maintenance.

Safety Information

Carbon monoxide detectors required in living spaces. Ensure proper ventilation and regular safety inspections.

Regulatory Compliance

UL certified and meets ANSI Z21.47 standards. Complies with Department of Energy efficiency requirements. Manufactured to meet or exceed industry safety standards. For technical support, contact Bryant Customer Service at 1-800-428-4326 or visit www.bryant.com.

Troubleshooting Guide

Reset: Power cycle furnace to clear temporary lockouts.

Service: 1-800-428-4326; www.bryant.com