The Arcoaire Furnace is a high-efficiency residential heating system designed for reliable performance and energy savings. This service manual covers installation, operation, maintenance, and troubleshooting procedures for certified HVAC technicians. The furnace features variable-speed blower motors, electronic ignition systems, advanced diagnostic controls, and multiple safety features including flame rollout switches and pressure switches.
Critical safety information for installation and service technicians.
| Hazard | Precaution |
|---|---|
| Electrical Shock | Disconnect power before servicing; use lockout/tagout procedures |
| Gas Leaks | Use leak detection solution; never use open flame to check for leaks |
| Carbon Monoxide | Ensure proper venting; test with CO detector after installation |
| Hot Surfaces | Allow unit to cool before servicing heat exchanger components |
| Moving Parts | Disconnect power before working on blower assembly |
| Combustible Materials | Maintain clearances per installation instructions |
Proper installation ensures safe and efficient operation.
WARNING! Installation must comply with local codes and manufacturer specifications. Only qualified technicians should perform installation.
Proper electrical connections are critical for safe operation.
CAUTION! Reverse polarity can damage control board. Verify wiring before energizing.
Gas piping must be properly sized and installed.
DANGER! Gas leaks can cause explosion or fire. Test all connections with leak detection solution.
Proper venting is essential for safe operation and efficiency.
| Vent Type | Requirements |
|---|---|
| Category I | Vertical metal vent; minimum height above roof |
| Category IV | PVC/CPVC pipe; specific slope requirements |
| Direct Vent | Separate intake and exhaust; specific clearances |
Ensure vent pipes are properly supported and sealed. Maintain clearances from windows, doors, and air intakes.
Follow this sequence for proper unit startup.
Normal operating characteristics and user controls.
Thermostat Settings: Programmable thermostats should be set for energy efficiency. Recommended setback: 68°F daytime, 62°F nighttime.
Blower Operation: Variable speed blower adjusts airflow based on heating demand for optimal comfort and efficiency.
Pilot Light: Electronic ignition - no standing pilot. System ignites only when heat is called for.
Regular maintenance ensures longevity and efficiency.
Control board LED flash codes for troubleshooting.
| Flash Pattern | Fault Code | Description |
|---|---|---|
| 1 Flash | Lockout | Ignition failure |
| 2 Flashes | Pressure Switch | Pressure switch stuck open |
| 3 Flashes | Limit Circuit | High limit switch open |
| 4 Flashes | Inducer | Inducer motor fault |
| 5 Flashes | Flame Sense | Flame sensed with gas valve off |
| Continuous | Normal | Unit operating normally |
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| No heat | Thermostat, power, gas valve | Check thermostat setting; verify power; check gas valve operation |
| Blower won't run | Motor, capacitor, control board | Test motor windings; check capacitor; verify control board output |
| Short cycling | Dirty filter, limit switch | Replace filter; check limit switch; verify airflow |
| Unusual noises | Blower wheel, inducer motor | Inspect for debris; check motor bearings; tighten components |
| Gas odor | Gas leak, improper combustion | Immediately shut off gas; check for leaks; verify combustion |
| Pilot outage | Draft, thermocouple | Check venting; test thermocouple output; clean pilot assembly |
Reset Procedure: Turn thermostat off, disconnect power for 30 seconds, restore power, reset thermostat.
Technical Support: 1-800-ARCOAIRE; www.arcoaire.com