Atwood Excalibur Furnace Installation Manual

The Atwood Excalibur Furnace is a high-efficiency heating system designed for RV and mobile applications, featuring electronic ignition, multi-speed blower, safety shut-off devices, and compatibility with propane/LP gas. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Gas Supply 7. Electrical Connections 8. Ventilation Requirements 9. Maintenance & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Electronic ignition system, multi-speed blower motor, heat exchanger, gas valve, thermostat control, safety pressure switch, combustion air intake, and exhaust outlet.

Feature	Description
Electronic Ignition	Pilotless ignition for reliable startup
Multi-Speed Blower	Adjustable airflow for optimal heating
Heat Exchanger	Stainless steel construction for durability
Gas Valve	Precision control of propane/LP gas flow
Thermostat Control	Compatible with standard RV thermostats
Safety Pressure Switch	Monitors combustion air flow
Combustion Air Intake	External air supply for safe operation
Exhaust Outlet	Vents combustion gases safely outside
Power Requirements	12V DC operation
BTU Ratings	Available in multiple heating capacities

Installation

Unpack and inspect contents. Ensure proper location and clearances.

Select installation location: Choose area with proper clearances to combustible materials.
Mount furnace: Secure to floor or wall using provided brackets and hardware.
Connect venting: Install combustion air intake and exhaust vent pipes.
Connect gas supply: Use approved gas line and fittings.
Connect electrical: Wire to 12V DC power source and thermostat.

WARNING! Installation must comply with local codes. Use only approved materials. Gas connections must be leak-tested.

First-Time Setup

Complete installation checks before initial startup.

Gas line pressure test: Check for leaks using soap solution.
Ventilation check: Ensure proper airflow through intake and exhaust.
Electrical verification: Confirm 12V DC power and thermostat wiring.
Initial startup: Follow lighting instructions carefully.
Performance test: Verify proper ignition, heating, and shutdown.

CAUTION! Never bypass safety devices. Ensure adequate ventilation during operation.

Specifications

Fuel Type: Propane/LP Gas
BTU Output: Various models available (check specific model)
Electrical: 12V DC operation
Ignition: Electronic direct spark
Blower: Multi-speed with adjustable airflow
Venting: Direct vent system required
Dimensions: Varies by model (consult specific model data)
Weight: Approximately 15-25 pounds
Clearances: Minimum 1" from combustible materials
Operating Temp: -40°F to 120°F ambient

Controls and Settings

Thermostat control for temperature setting. Manual reset button for safety lockout.

Operation: Set desired temperature on thermostat. Furnace will cycle automatically to maintain temperature.

Blower Speed: Adjustable for optimal airflow and noise levels. Gas Pressure: Factory set - do not adjust unless qualified. Safety Devices: Pressure switch, overheat protection, flame sensor.

Connecting Gas Supply

Use approved gas line and fittings. Pressure test required.

Turn off all gas supplies before connecting.
Use only approved gas line and fittings designed for LP gas.
Connect to furnace gas valve using proper thread sealant.
Pressure test entire gas system for leaks.
Verify proper gas pressure at furnace inlet.

Tip: Use leak detection solution to check all connections. Never use open flame.

Electrical Connections

12V DC power required. Proper polarity essential.

Disconnect power source before wiring.
Connect 12V DC power observing correct polarity.
Wire thermostat according to wiring diagram.
Secure all connections with proper connectors.
Verify proper operation of all controls.

WARNING! Reverse polarity can damage control board. Use proper fuse protection.

Ventilation Requirements

Direct vent system mandatory for safe operation.

Install combustion air intake pipe to outside air source.
Install exhaust vent pipe to direct combustion gases outside.
Maintain proper slope for condensation drainage.
Ensure adequate clearance from windows and openings.
Use only approved venting materials.

CAUTION! Never operate without proper venting. Blocked vents can cause carbon monoxide hazard.

Maintenance & Cleaning

Annual maintenance recommended. Turn off power and gas before servicing.

Clean combustion chamber annually.
Inspect and clean blower wheel and motor.
Check and clean flame sensor.
Inspect heat exchanger for cracks or damage.
Verify proper operation of all safety devices.

CAUTION! Only qualified technicians should perform internal repairs. Keep area around furnace clear.

Regulatory Information

CSA certified for mobile home use. Complies with ANSI Z21.44 standards. Installation must comply with NFPA 501C, NFPA 54, and NFPA 58. For support, contact Atwood Customer Service at 1-800-555-HEAT or visit www.atwoodmobile.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power supply/thermostat	Check 12V power; verify thermostat setting and wiring.
No ignition	Gas supply/ignition	Verify gas valve open; check for spark at igniter.
Blower runs but no heat	Gas flow/ignition	Check gas pressure; verify proper flame ignition.
Short cycling	Overheating/airflow	Clean filters; check for blocked vents; verify proper airflow.
Lockout condition	Safety device activation	Reset manual reset button; check pressure switch operation.

Reset: Manual reset button on control board if equipped.

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