hydro flame furnace manual afmd20

The Hydro Flame AFMD20 is a high-efficiency RV furnace designed for reliable heating in recreational vehicles. This forced-air furnace features electronic ignition, variable-speed blower, safety shut-off systems, and operates on propane fuel. With a heating capacity of 20,000 BTU/hr, it provides consistent warmth while maintaining energy efficiency. Below are key sections covering 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 Gas Supply 7. Operating the Furnace 8. Safety Features 9. Maintenance & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Electronic ignition system, variable-speed blower motor, heat exchanger, combustion chamber, thermostat control, safety shut-off valve.

Feature	Description
Electronic Ignition	No standing pilot light for improved safety and efficiency
Variable-Speed Blower	Adjustable airflow for optimal heating and noise control
Heat Exchanger	Stainless steel construction for durability and heat transfer
Thermostat Control	Precise temperature regulation
Safety Shut-off Valve	Automatic gas shut-off in case of malfunction
Combustion Air Intake	External air supply for safe combustion
Exhaust Vent	Safe removal of combustion gases
Power Requirements	12V DC operation
Fuel Type	Liquid Propane (LP) gas
Heating Capacity	20,000 BTU/hr

Installation

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

Select installation location: Choose area with adequate clearance and ventilation access.
Mount furnace: Secure to floor or wall using provided brackets and hardware.
Connect ductwork: Attach heating ducts to outlet plenum.
Connect power: Wire to 12V DC power source with proper fuse protection.
Connect thermostat: Install and wire thermostat according to diagram.

WARNING! Installation must be performed by qualified technician. Ensure proper ventilation to prevent carbon monoxide buildup.

First-Time Setup

Complete installation checks before initial operation.

Gas connection: Verify all gas fittings are tight and leak-free.
Ventilation check: Ensure exhaust and intake vents are unobstructed.
Power verification: Confirm 12V DC power supply is stable.
Initial startup: Follow lighting procedure in operation section.
System test: Run furnace through complete heating cycle.

CAUTION! Test for gas leaks using soap solution. Never use open flame to check for leaks.

Specifications

Model: Hydro Flame AFMD20
Heating Capacity: 20,000 BTU/hr
Fuel Type: Liquid Propane (LP)
Power Requirements: 12V DC
Ignition System: Electronic spark ignition
Blower Type: Variable-speed centrifugal
Dimensions: 12.5" H x 17.5" W x 9.5" D
Weight: 18 lbs
Vent Size: 3-inch diameter
Gas Pressure: 11 inches water column

Controls and Settings

Primary control via wall thermostat. Manual override available at furnace unit.

Thermostat Controls: Temperature setting, fan mode (auto/on), system on/off.

Furnace Controls: Manual reset button, diagnostic LED, gas valve control.

Operating Modes: Heating mode with automatic fan control, fan-only mode for ventilation. Temperature range: 50°F to 90°F adjustable. Fan delay: Built-in delay on start and stop for efficiency.

Connecting Gas Supply

LP gas system connection requirements and procedures.

Turn off all gas valves before beginning.
Use approved gas line and fittings rated for LP gas.
Connect gas line to furnace gas valve inlet.
Pressure test system at 11 inches water column.
Check all connections for leaks with soap solution.

Tip: Use two wrenches when connecting gas lines to prevent damage to valves.

Operating the Furnace

Normal operation procedures and cycling sequence.

Set thermostat: Turn to desired temperature above current room temperature.
Ignition sequence: Blower starts, followed by spark ignition and gas valve opening.
Heating cycle: Burner lights, heat exchanger warms, blower circulates warm air.
Shutdown: Thermostat satisfied, gas valve closes, blower continues for cool-down.
Emergency shutoff: Turn thermostat to lowest setting or use main gas valve.

WARNING! Never operate furnace with exterior cover removed. Keep combustible materials away from furnace.

Safety Features

Multiple safety systems ensure safe operation: High-limit switch, roll-out switch, pressure switch, flame sensor, automatic shut-off valve.

Maintenance & Cleaning

Regular maintenance ensures optimal performance and safety.

Annual inspection: Check heat exchanger, burners, and venting system.
Filter cleaning: Clean or replace air filter every 3 months.
Vent inspection: Ensure exhaust and intake vents are clear of debris.
Blower maintenance: Clean blower wheel and motor annually.

CAUTION! Turn off gas and power before performing any maintenance. Use only approved replacement parts.

Regulatory Information

Certified to ANSI Z21.44 standards for RV furnaces. CSA International approved. This appliance must be installed in accordance with local codes and regulations. For technical support, contact Hydro Flame customer service at 1-800-555-HEAT or visit www.hydroflame.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power issue/thermostat	Check 12V power supply; verify thermostat setting and wiring.
No heat	Gas supply/ignition	Check propane supply; listen for ignition spark; verify gas valve operation.
Blower runs but no heat	Ignition failure	Check spark electrode; verify gas flow; inspect flame sensor.
Short cycling	Overheating/airflow	Check air filter; ensure proper ventilation; verify heat exchanger clearance.
Unusual odors	Dust accumulation	Clean burners and heat exchanger; check for obstructions.

Reset: Turn thermostat off for 5 minutes, then restart.

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