Carrier 58MSA Furnace Manual

The Carrier 58MSA is a high-efficiency gas furnace designed for residential heating applications. This multi-speed furnace features advanced combustion technology, electronic ignition, and variable-speed blower operation for optimal comfort and energy efficiency. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation Requirements 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Venting and Combustion Air 7. Operating Instructions 8. Maintenance Procedures 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Multi-speed blower motor, electronic ignition system, heat exchanger, gas valve, pressure switches, limit controls, and integrated control board.

Feature	Description
Multi-speed blower	Variable speed operation for optimal airflow and efficiency
Electronic ignition	Hot surface igniter for reliable lighting
Heat exchanger	Stainless steel construction for durability
Gas valve	Precise gas flow control
Pressure switches	Safety monitoring of combustion air
Limit controls	Over-temperature protection
Control board	Integrated system management
Filter access	Easy filter replacement
Diagnostic LED	Error code display for troubleshooting
Service switches	Convenient power disconnect

Installation Requirements

Professional installation required. Verify local codes and obtain permits.

Location: Install in dry, clean area with adequate clearance for service.
Gas connection: Use approved gas piping materials; pressure test required.
Electrical: 120V AC power supply with proper grounding.
Venting: Category IV vent system; follow manufacturer specifications.
Combustion air: Provide adequate fresh air supply.

WARNING! Gas appliances can be hazardous; installation must be performed by qualified technician. Ensure proper ventilation and combustion air supply.

First-Time Setup

Initial startup must be performed by qualified technician.

Verify installation: Check all connections, clearances, and venting.
Gas pressure: Adjust manifold pressure to specifications.
Electrical: Verify proper voltage and grounding.
Startup sequence: Follow manufacturer startup procedure.
System check: Verify proper operation of all safety controls.

CAUTION! Do not attempt startup without proper training and equipment. Carbon monoxide hazard exists if improperly installed.

Specifications

Model Series: 58MSA
Fuel Type: Natural Gas
Input Capacity: 40,000-120,000 BTU/H (varies by model)
Efficiency: Up to 96% AFUE
Blower Type: Multi-speed, direct drive
Electrical: 120V AC, 60Hz
Gas Connection: 1/2" NPT
Venting: Category IV (PVC/CPVC)
Dimensions: Varies by model (check specific model data)
Weight: 90-150 lbs (varies by model)

Controls and Settings

Integrated furnace control board manages all operations. Thermostat controls heating demand.

Control Board: LED diagnostic indicators, dip switch settings for blower speeds, system configuration.

Thermostat Settings: Heat/Cool/Auto modes, temperature setpoints, fan control. Blower Speeds: Adjustable via dip switches for heating and cooling modes. Limit Controls: Automatic high-temperature shutdown. Pressure Switches: Verify proper venting operation.

Venting and Combustion Air

Category IV vent system required. Follow local codes and manufacturer specifications.

Vent piping: Use approved PVC or CPVC materials.
Vent termination: Locate away from windows, doors, and air intakes.
Combustion air: Provide adequate fresh air supply per installation requirements.
Clearances: Maintain required clearances to combustible materials.

Tip: Regular inspection of vent system required to ensure proper operation and safety.

Operating Instructions

Normal operation controlled by thermostat.

Set thermostat to desired temperature and HEAT mode.
Furnace will initiate startup sequence when heat demand exists.
Inducer motor starts first to establish draft.
Hot surface igniter activates and gas valve opens.
Main burner lights; blower starts after heat exchanger warms.
When thermostat satisfied, gas valve closes and blower continues until heat exchanger cools.

WARNING! Never block air vents or returns. Keep area around furnace clear of combustible materials.

Maintenance Procedures

Annual professional maintenance recommended. Regular homeowner maintenance required.

Filter replacement: Replace air filter every 1-3 months.
Visual inspection: Check for debris, corrosion, or damage.
Vent inspection: Ensure vent pipes are clear and secure.
Professional service: Annual cleaning and safety inspection.

Care & Cleaning

Turn off power before cleaning. Keep furnace area clean and dry.

CAUTION! Do not use water or liquid cleaners. Use vacuum with soft brush attachment for dust removal. Keep electrical components dry.

Regulatory Information

ANSI Z21.47: Certified for safety standards. UL listed. Complies with Department of Energy efficiency standards. Manufactured to meet or exceed industry safety requirements. For technical support, contact Carrier at 1-800-CARRIER or visit www.carrier.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, safety lockout	Check power switch; verify thermostat settings; reset if locked out.
No heat	Gas supply, igniter, limit switch	Verify gas valve on; check for ignition; reset high limit if tripped.
Short cycling	Dirty filter, airflow restriction	Replace air filter; check for blocked vents or returns.
Blower won't stop	Thermostat fan setting	Check thermostat fan setting (Auto/On); verify control board operation.
Unusual noises	Loose components, airflow	Inspect for loose parts; check blower wheel and motor.

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

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