Atwood Furnace Parts Manual

The Atwood Furnace is a high-efficiency heating system designed for residential and commercial applications, featuring durable components, easy maintenance, and reliable performance. This manual covers essential parts information, installation guidelines, maintenance procedures, and troubleshooting for various Atwood furnace models. Below are key sections for parts identification, installation, operation, maintenance, and technical specifications.

1. Parts Overview 2. Installation Guidelines 3. Operation Instructions 4. Technical Specifications 5. Maintenance Procedures 6. Parts Replacement 7. Safety Features 8. Wiring Diagrams 9. Care & Maintenance 10. Regulatory Information 11. Troubleshooting

Parts Overview

Key components: Burner assembly, Heat exchanger, Blower motor, Ignition system, Gas valve, Control board, Thermostat, Filter system, Venting components.

Part	Description
Burner assembly	Main combustion component for fuel burning
Heat exchanger	Transfers heat from combustion to air stream
Blower motor	Circulates heated air through duct system
Ignition system	Electronic ignition for reliable startup
Gas valve	Controls gas flow to burner
Control board	Main electronic control unit
Thermostat	Temperature regulation device
Filter system	Air filtration for clean operation
Venting components	Exhaust and intake vent systems
Limit switches	Safety temperature controls

Installation Guidelines

Proper installation ensures optimal performance and safety.

Location selection: Choose well-ventilated area with adequate clearance.
Gas connection: Use approved gas piping; check for leaks with soap solution.
Electrical connection: Connect to proper voltage source; ensure proper grounding.
Venting installation: Install according to local codes and manufacturer specifications.
Ductwork connection: Secure all duct connections; ensure proper airflow.

WARNING! Installation must be performed by qualified technician. Follow all local codes and regulations.

Operation Instructions

Power on furnace; follow startup sequence.

Thermostat setting: Set desired temperature on thermostat.
System startup: Furnace will initiate ignition sequence automatically.
Normal operation: Blower will start after heat exchanger reaches temperature.
Shutdown: System will cycle off when thermostat setting is reached.
Pilot light (if applicable): Follow lighting instructions for standing pilot models.

CAUTION! Never attempt to override safety controls. Contact technician if system malfunctions.

Technical Specifications

Heating Capacity: 40,000-120,000 BTU/h (varies by model)
Efficiency Rating: 80-96% AFUE
Fuel Type: Natural Gas or Propane
Electrical Requirements: 120V AC, 60Hz
Blower Motor: Multi-speed, electronically commutated
Venting: PVC, ABS, or metal depending on model
Dimensions: Varies by model (consult specific model documentation)
Weight: 80-150 lbs depending on model
Operating Temp Range: -30°F to 120°F ambient

Maintenance Procedures

Regular maintenance ensures longevity and efficiency.

Monthly: Check and replace air filter if dirty. Listen for unusual noises.

Seasonal: Professional inspection before heating season. Clean burner assembly. Check heat exchanger for cracks.

Annual: Complete system inspection by qualified technician. Clean blower assembly. Check electrical connections. Verify gas pressure settings.

Parts Replacement

Use only genuine Atwood replacement parts.

Disconnect power and gas supply before any service.
Identify correct part number from parts list.
Follow specific replacement procedures for each component.
Test operation after replacement.
Keep records of all parts replaced.

Tip: Always verify part compatibility with your specific furnace model.

Safety Features

Multiple safety systems protect against hazardous conditions.

Flame rollout switches: Detect improper burner operation
Limit switches: Prevent overheating
Pressure switches: Verify proper venting
Ignition safety: Shuts gas valve if ignition fails
Carbon monoxide detection: Built-in CO monitoring on some models

WARNING! Never bypass safety devices. Replace faulty safety components immediately.

Wiring Diagrams

Refer to specific model wiring diagram for electrical connections.

Standard components: Thermostat connections, Transformer, Control board terminals, Blower motor wiring, Gas valve wiring, Safety switch circuits.

CAUTION! Electrical work should be performed by qualified electrician. Always disconnect power before servicing.

Care & Maintenance

Regular care extends furnace life and maintains efficiency.

Keep area around furnace clean and unobstructed.
Change filters regularly (1-3 months depending on usage).
Schedule professional maintenance annually.
Keep combustion air intake clear of debris.
Monitor for unusual sounds or odors.

CAUTION! Never store flammable materials near furnace. Keep ventilation clear.

Regulatory Information

UL listed: Complies with UL Standard 795. ANSI Z21.47: Certified for gas-fired central furnaces. CSA certified: Meets Canadian Standards Association requirements. EPA compliant: Meets environmental protection standards. For technical support, contact Atwood Customer Service at 1-800-555-HEAT or visit www.atwoodfurnace.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power supply, thermostat, safety lockout	Check circuit breaker; verify thermostat setting; reset system.
No heat	Gas supply, ignition, filter	Check gas valve; verify pilot/ignition; replace dirty filter.
Short cycling	Dirty filter, airflow restriction	Replace filter; check vents and registers; verify thermostat location.
Unusual noises	Loose components, motor issues	Tighten access panels; check blower wheel; lubricate motor if applicable.
Blower not working	Motor, capacitor, control board	Check motor operation; test capacitor; verify control board signals.

Reset Procedure: Turn thermostat off for 5 minutes, then back on. If problem persists, contact technician.

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