Carrier Furnace Manual 58PAV

The Carrier 58PAV is a high-efficiency gas furnace series designed for residential heating applications. This multi-speed furnace features variable-capacity operation, electronic ignition, induced draft combustion, and advanced diagnostic controls. Available in various BTU capacities with AFUE ratings up to 96.5%. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation Requirements 3. Initial Setup & Startup 4. Technical Specifications 5. Controls and Operation 6. Venting and Combustion Air 7. Maintenance Procedures 9. Safety Features 10. Care & Cleaning 11. Regulatory Information 12. Troubleshooting

Features at a Glance

Key components: Variable-speed blower motor, hot surface ignitor, induced draft motor, pressure switches, flame sensor, control board with diagnostic LED.

Feature	Description
Variable-speed blower	Provides consistent airflow and quiet operation
Hot surface ignitor	Electronic ignition for reliable lighting
Induced draft motor	Pulls combustion gases through heat exchanger
Pressure switches	Verify proper venting before ignition
Flame sensor	Detects burner flame for safety shutdown
Diagnostic LED	Displays error codes for troubleshooting
Multi-speed operation	Adjustable blower speeds for different heating stages
High-efficiency heat exchanger	Stainless steel construction for durability
Electronic air cleaner compatible	Works with Carrier electronic air cleaners
Humidifier compatible	Supports whole-home humidification systems

Installation Requirements

Professional installation required. Verify local codes and obtain permits.

Location: Install in dry, clean area with adequate service clearance.
Combustion air: Provide adequate fresh air per local codes.
Venting: Use approved PVC or CPVC for condensing furnaces.
Gas supply: Connect with black iron pipe; test for leaks.
Electrical: 120V AC power with proper grounding.
Ductwork: Size appropriately for CFM requirements.

WARNING! Gas appliances can produce carbon monoxide. Proper installation and venting are critical for safety.

Initial Setup & Startup

Professional startup procedure required for warranty validation.

Verify installation: Check all connections, venting, and gas pressure.
Power up: Turn on electrical power and gas supply.
Test operation: Set thermostat to heat mode above room temperature.
Check airflow: Verify proper airflow across heat exchanger.
Measure temperature rise: Ensure within specified range on rating plate.
Verify safety controls: Test limit switches and pressure controls.

CAUTION! Only qualified HVAC technicians should perform startup procedures.

Technical Specifications

Model Series: 58PAV (040-120)
Input BTU/H: 40,000 to 120,000
AFUE Rating: Up to 96.5%
Gas Type: Natural gas (LP conversion kit available)
Electrical: 120V AC, 60Hz
Blower Motor: Variable-speed ECM
Venting: PVC/CPVC (2" minimum)
Operating Pressure: 3.5" WC natural gas
Temperature Rise: 35-65°F
Sound Rating: As low as 4.0 Sones

Controls and Operation

Integrated furnace control board manages all operations with diagnostic capabilities.

Thermostat Connections: R, C, W, G, Y terminals for heating and cooling control.

Operation Sequence: Call for heat → Inducer motor starts → Pressure switch proves → Hot surface ignitor heats → Gas valve opens → Flame sensor verifies → Blower starts after delay.

Diagnostic LED: Flashes error codes during normal operation and fault conditions.

Venting and Combustion Air

Category IV venting system required for proper operation.

Vent pipe: Use schedule 40 PVC or CPVC; slope toward furnace.
Termination: Locate away from windows, doors, and air intakes.
Combustion air: Provide separate intake or use direct vent configuration.
Clearances: Maintain specified clearances to combustible materials.

Tip: Always verify venting with manometer during startup.

Maintenance Procedures

Annual professional maintenance recommended for optimal performance.

Air filter: Replace every 1-3 months depending on usage.
Heat exchanger: Inspect annually for cracks or corrosion.
Blower assembly: Clean annually; check motor amperage.
Vent system: Inspect for obstructions or damage.
Drain system: Clear condensate trap and drain lines.
Burners: Clean and verify proper flame pattern.
Safety controls: Test operation of all limit switches.

WARNING! Turn off electrical power and gas supply before performing maintenance.

Safety Features

Multiple safety systems protect against hazardous conditions: Rollout switches, high limit switches, pressure switches, flame rollout protection, ignitor safety timing, flame sensor protection.

Care & Cleaning

Regular maintenance ensures efficient operation and longevity.

CAUTION! Never operate without filter. Keep area around furnace clean and unobstructed.

Regulatory Information

UL certified. ANSI Z21.47 standards. CSA certified. Meets U.S. Department of Energy efficiency standards. For support, visit www.carrier.com or contact 1-800-CARRIER. Copyright © Carrier Corporation. All rights reserved.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, door switch	Check circuit breaker; verify thermostat setting; ensure door properly closed.
No heat	Gas supply, ignitor, flame sensor	Verify gas valve on; check for ignitor failure; clean flame sensor.
Short cycling	Dirty filter, blocked vent	Replace air filter; check vent system for obstructions.
Blower won't stop	Thermostat fan setting	Check thermostat fan setting (auto/on); verify control board operation.
Error code flashing	Various system faults	Count LED flashes and refer to diagnostic chart in service manual.

Reset: Power cycle furnace by turning off power for 30 seconds.

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