Comfort Aire Furnace Manual

The Comfort Aire Furnace is a high-efficiency heating system designed for residential use, featuring advanced temperature control, energy-saving modes, safety shut-off mechanisms, and compatibility with various thermostat systems. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Thermostat 7. Operating Modes 8. Safety Features 9. Maintenance & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: High-efficiency burner, blower motor, heat exchanger, control board, gas valve, filter compartment, thermostat connections.

Feature	Description
High-efficiency burner	Provides optimal heat output with fuel efficiency
Variable-speed blower	Adjusts airflow for consistent temperature
Heat exchanger	Transfers heat to air while separating combustion gases
Control board	Manages furnace operation and safety features
Gas valve	Regulates gas flow to burner
Filter compartment	Holds air filter for clean airflow
Thermostat connections	For connecting to compatible thermostat systems
POWER switch	Turns furnace on/off
PILOT light	Indicates pilot status
RESET button	Resets furnace after safety shut-off

Installation

Unpack and inspect all components. Ensure proper ventilation and clearances.

Location selection: Choose well-ventilated area with proper clearances from combustible materials.
Gas connection: Connect gas line using approved piping and fittings.
Vent installation: Install vent pipes according to local codes and manufacturer specifications.
Electrical connection: Connect to proper power supply and ground according to electrical codes.
Thermostat wiring: Connect compatible thermostat following wiring diagram.

WARNING! Installation must be performed by qualified technician. Gas leaks can cause explosion or fire.

First-Time Setup

After installation, perform initial setup and testing.

Check gas connections: Use leak detection solution to verify no gas leaks.
Power on: Turn on power switch and verify control board lights.
Pilot light: Follow lighting instructions for initial ignition.
Test operation: Set thermostat to call for heat and verify proper furnace operation.
Adjust settings: Configure fan speed and temperature limits as needed.

CAUTION! Never attempt to service gas components without proper training and tools.

Specifications

Heating Capacity: 40,000-120,000 BTU/h (model dependent)
Efficiency: 80-95% AFUE
Fuel Type: Natural gas or propane
Electrical: 120V AC, 60Hz
Blower Motor: Variable-speed ECM
Heat Exchanger: Stainless steel or aluminized steel
Vent Size: 2-4 inch PVC or metal
Filter Size: 16x25x1 inch standard
Operating Temp Range: -30°F to 120°F ambient

Controls and Settings

Access control panel for basic adjustments. Advanced settings via thermostat.

Control Panel: POWER switch, PILOT indicator, RESET button, DIAGNOSTIC lights.

Temperature Control: Set via connected thermostat. Fan Control: AUTO/ON modes. Safety Limits: High-limit switch, pressure switch, flame sensor. Diagnostic: LED lights indicate error codes for troubleshooting.

Connecting Thermostat

Compatible with most 24V thermostat systems.

Turn off power to furnace before wiring.
Match thermostat wires to furnace terminal block (R, W, G, Y, C).
Secure connections and replace access panel.
Restore power and test thermostat operation.

Tip: Use programmable thermostat for energy savings and comfort control.

Operating Modes

Multiple operating modes for efficiency and comfort.

Heating Mode: Primary heating operation when thermostat calls for heat.
Fan Only: Circulates air without heating for improved air quality.
Standby: Waits for thermostat signal while maintaining system readiness.
Safety Mode: Automatically shuts down if unsafe conditions detected.
Diagnostic Mode: Provides error codes for service technicians.

WARNING! Do not operate furnace if unusual odors, sounds, or performance issues occur.

Safety Features

Multiple safety systems protect against hazardous conditions.

Safety Feature	Function
High-limit switch	Shuts off burner if temperature exceeds safe limits
Pressure switch	Ensures proper venting before ignition
Flame sensor	Detects burner flame and shuts off gas if no flame
Rollout switch	Prevents flame rollout from burner compartment
Gas valve	Automatically shuts off if electrical power lost

Maintenance & Cleaning

Regular maintenance ensures optimal performance and longevity.

Monthly: Check and replace air filter if dirty.
Seasonal: Inspect vent system for obstructions.
Annual: Professional inspection and cleaning of burner, heat exchanger, and blower.
As needed: Clean flame sensor and check electrical connections.

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

Regulatory Information

UL certified for safety standards. Complies with ANSI Z21.47 for gas-fired central furnaces. CSA certified for Canadian standards. Manufactured to meet or exceed DOE energy efficiency requirements. For technical support, visit www.comfortaire.com or contact 1-800-555-HEAT.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, safety lockout	Check power switch, thermostat settings, reset button
No heat	Gas supply, pilot, filter	Verify gas valve on, check pilot light, replace filter
Short cycling	Dirty filter, thermostat location	Clean/replace filter, relocate thermostat if needed
Unusual noises	Blower, burner, loose parts	Inspect blower wheel, clean burner, tighten components
Pilot won't stay lit	Thermocouple, gas pressure	Clean/replace thermocouple, check gas pressure

Reset: Use RESET button on control panel after addressing issue.

Service: 1-800-555-HEAT; www.comfortaire.com