The Atwood 8535 is a high-efficiency RV furnace designed for recreational vehicles, featuring a compact design, forced-air heating system, electronic ignition, and multiple safety features. This manual covers installation, operation, troubleshooting, maintenance, and repair procedures for the 8535 series furnace. Below are key sections for safety precautions, technical specifications, installation guidelines, operation instructions, maintenance procedures, and troubleshooting guides.
Key components: Main burner assembly, blower motor, sail switch, limit switch, electronic control board, gas valve, thermostat, and exhaust system.
| Feature | Description |
|---|---|
| Heating Capacity | 25,000 BTU/hour output |
| Ignition System | Electronic spark ignition |
| Fuel Type | Liquid propane (LP) gas |
| Airflow | Forced-air circulation system |
| Voltage | 12V DC operation |
| Thermostat Control | Electronic thermostat with temperature settings |
| Safety Features | Overheat protection, flame failure detection |
| Exhaust System | Sealed combustion chamber |
| Dimensions | Compact design for RV installation |
| Weight | Approximately 15 lbs |
Proper installation is critical for safe and efficient operation. Follow all local codes and RV manufacturer specifications.
WARNING! Installation must be performed by qualified technician. Gas leaks can cause explosion or fire.
Operating the Atwood 8535 furnace requires proper thermostat settings and system checks.
CAUTION! Never operate furnace with cover removed. Ensure proper ventilation during operation.
Understanding furnace components is essential for proper operation and troubleshooting.
Main Components: Control board, gas valve, blower motor, sail switch, limit switch, igniter, flame sensor, thermostat.
Control Board: Manages ignition sequence, monitors safety switches, controls blower operation. Gas Valve: Regulates gas flow to burner. Blower Motor: Circulates heated air through duct system. Sail Switch: Confirms adequate airflow before ignition. Limit Switch: Prevents overheating by shutting off gas if temperature exceeds safe limits. Igniter: Creates spark for gas ignition. Flame Sensor: Detects presence of flame. Thermostat: User interface for temperature control.
Regular maintenance ensures optimal performance and extends furnace lifespan.
Tip: Keep maintenance records for warranty and service purposes.
Common issues and solutions for Atwood 8535 furnace operation.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Furnace won't start | Power loss, thermostat issue | Check 12V power, verify thermostat settings, inspect fuse. |
| No heat output | Gas supply, ignition failure | Check LP tank level, verify gas valve operation, inspect igniter. |
| Blower runs but no heat | Ignition system failure | Check spark igniter, flame sensor, gas valve operation. |
| Furnace cycles on/off rapidly | Overheating, airflow restriction | Clean heat exchanger, check ductwork, verify blower operation. |
| Unusual noises | Blower issues, loose components | Inspect blower wheel, tighten mounting hardware, check for obstructions. |
| Gas odor | Gas leak | Immediately shut off gas supply, ventilate area, check for leaks. |
The Atwood 8535 incorporates multiple safety systems to prevent hazardous conditions.
WARNING! Never bypass safety devices. Tampering with safety systems creates serious hazards.
Authorized replacement parts ensure proper fit and performance.
Note: Use only genuine Atwood replacement parts for safety and warranty compliance.
This furnace complies with ANSI Z21.44 standards for recreational vehicle heaters. Certified by CSA International for North American use. Installation must comply with NFPA 1192 Standard for Recreational Vehicles and all local codes. Manufactured by Atwood Mobile Products. Copyright protection applies to all technical documentation.
For technical support, parts ordering, or authorized service:
Emergency Service: For gas leaks or immediate safety concerns, contact local emergency services and qualified HVAC technician.