Atwood Hydro Flame Furnace Service Manual

The Atwood Hydro Flame Furnace is a high-efficiency heating system designed for RV and mobile applications, featuring electronic ignition, multiple heat settings, safety shut-off systems, and easy maintenance access. 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 to Power and Fuel 7. Operating Procedures 8. Maintenance Schedule 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Electronic ignition system, thermostat control, air intake/exhaust vents, gas valve, combustion chamber, blower motor, and safety sensors.

Feature	Description
Electronic Ignition	Automatic spark ignition for reliable startup
Thermostat Control	Precise temperature regulation
Safety Shut-off	Automatic shutdown if flame failure detected
Multiple Heat Settings	Adjustable BTU output for efficiency
Blower Motor	Forced air distribution system
Combustion Chamber	Stainless steel construction for durability
Air Intake/Exhaust	Dual-port system for proper ventilation
Gas Valve	Regulates propane/natural gas flow
Control Panel	LED indicators and mode selection
Maintenance Access	Easy-to-remove panels for service

Installation

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

Mount furnace: Secure to floor or wall using provided brackets
Connect venting: Install intake and exhaust pipes according to specifications
Gas connection: Use approved gas line and fittings; check for leaks
Electrical connection: Connect to 12V DC power source
Thermostat wiring: Connect to compatible thermostat system

WARNING! Installation must comply with local codes. Use only certified technicians for gas connections.

First-Time Setup

Complete installation checks before initial startup.

Gas pressure test: Verify proper gas pressure at valve
Ventilation check: Ensure clear air intake and exhaust paths
Electrical test: Confirm 12V DC power supply
Initial ignition: Follow startup sequence in manual
Calibration: Set thermostat and heat settings

CAUTION! Never bypass safety systems. Test carbon monoxide detectors.

Specifications

Heating Capacity: 16,000-30,000 BTU (model dependent)
Fuel Type: Propane or Natural Gas
Ignition System: Electronic spark ignition
Power Requirements: 12V DC
Efficiency Rating: 80%+ AFUE
Airflow: Adjustable blower speeds
Dimensions: Varies by model (typically 14"L x 10"W x 10"H)
Weight: 15-25 lbs depending on model
Operating Temp Range: -40°F to 120°F
Vent Requirements: Direct vent or roof vent options

Controls and Settings

Control panel includes power switch, thermostat dial, mode selector, and status LEDs.

Remote Thermostat: Temperature setting, fan control, system on/off.

Operating Modes: HEAT, FAN ONLY, OFF. Heat Settings: LOW, MEDIUM, HIGH. Safety Features: Flame sensor, overheat protection, pressure switch, roll-out switch. Maintenance Indicators: Filter status, service required LED.

Connecting to Power and Fuel

Proper connections ensure safe and efficient operation.

Turn off all power and gas supply before connecting
Gas line: Use approved flexible gas line with proper fittings
Electrical: Connect to 12V DC power with correct polarity
Grounding: Ensure proper electrical grounding
Test connections: Check for gas leaks and electrical continuity

Tip: Use gas leak detector solution on all connections.

Operating Procedures

Standard operating sequence for normal use.

Power on: Switch control panel to ON position
Set thermostat: Adjust to desired temperature
Select mode: Choose HEAT mode for heating
Startup: System will initiate ignition sequence automatically
Monitor: Watch for proper ignition and flame establishment
Adjust settings: Modify heat output as needed
Shutdown: Turn thermostat to lowest setting before power off

WARNING! Never operate without proper ventilation. Monitor for unusual odors or sounds.

Maintenance Schedule

Regular maintenance ensures optimal performance and safety.

Interval	Maintenance Task
Monthly	Check air filter; clean if dirty
Seasonal	Inspect venting system; clean combustion chamber
Annual	Professional inspection and cleaning
Every 2 years	Replace thermocouple and flame sensor
As needed	Check gas connections and electrical wiring

Care & Cleaning

Turn off power and gas supply before cleaning. Use soft brush and compressed air for internal components.

CAUTION! Never use water or liquid cleaners on electrical components. Wear protective equipment when handling combustion chamber.

Regulatory Information

UL certified for RV use. Complies with ANSI Z21.44 standards for gas-fired heaters. CSA certified for Canadian market. Manufactured to meet EPA emissions standards. For technical support, contact Atwood Customer Service at 1-800-555-HEAT or visit www.atwoodmobile.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No ignition	Gas supply, spark electrode	Check gas valve; clean spark electrode; verify power
Short cycling	Dirty filter, airflow restriction	Clean/replace filter; check vent blockage
Blower not working	Motor, wiring, capacitor	Check motor operation; test wiring; replace capacitor if needed
Flame failure	Dirty sensor, gas pressure	Clean flame sensor; check gas pressure settings
Unusual odors	Dust buildup, combustion issues	Clean combustion chamber; check for proper ventilation

Reset Procedure: Turn power off for 30 seconds, then restart.

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