Suburban NT-20S RV Furnace User Manual

1. Introduction

This manual provides essential information for the safe and efficient operation, installation, and maintenance of your Suburban NT-20S RV Furnace. The NT-S series furnaces are designed to provide reliable heating for recreational vehicles. These compact 12-volt DC units feature low amp draw and energy-saving solid-state electronic ignition, ensuring quick and efficient heating of living areas. They utilize sealed forced-draft combustion for optimal performance.

Please read this manual thoroughly before attempting to install, operate, or service the furnace. Keep it in a safe place for future reference.

2. Safety Information

WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause property damage, injury, or death. Read the installation, operating, and maintenance instructions thoroughly before installing or servicing this equipment.

• Ensure adequate ventilation when operating the furnace.
• Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
• Never obstruct the air intake or exhaust vents of the furnace.
• Always turn off the gas supply and electrical power before performing any maintenance or service.
• If you smell gas, immediately shut off the gas supply, open windows and doors, and do not operate any electrical switches or appliances. Contact a qualified service technician.
• This product may expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

3. Product Overview

The Suburban NT-20S RV Furnace is a robust heating solution for your recreational vehicle. Key features include:

• Low Amp Draw: Designed for efficient power consumption in RV environments.
• Energy Saving Technology: Incorporates solid-state electronic ignition for improved efficiency.
• Zone Heating Capable: Multiple units can be installed for zoned temperature control in larger coaches.
• Compact and Lightweight Design: Ideal for modern RVs with space constraints.
• Sealed Forced-Draft Combustion: Ensures safe and efficient burning.

Figure 1: Suburban NT-20S RV Furnace unit. This image displays the compact heating unit designed for recreational vehicles.

4. Setup and Installation

The NT-20S furnace is designed for wall-mount installation. While installation is generally straightforward, it involves gas and electrical connections.

1. Professional Installation Recommended: Due to the nature of gas and electrical connections, it is highly recommended that installation be performed by a qualified RV technician or licensed professional.
2. Unpacking: Carefully remove the furnace from its packaging. Inspect for any shipping damage.
3. Mounting: Securely mount the furnace in the designated wall location within your RV. Ensure proper clearances as specified in the detailed installation guide (included with the product).
4. Ventilation: Install the gasket-sealed vent assemblies and chrome-plated vent caps according to the instructions to ensure proper exhaust and intake.
5. Gas Connection: Connect the gas supply line to the furnace. Perform a leak test on all gas connections using a non-corrosive leak detection solution.
6. Electrical Connection: Connect the 12-volt DC power supply and thermostat wiring. Ensure correct polarity and secure connections.
7. Ductwork (NT-S Series): As an NT-S series furnace, this model is designed for ducted heat distribution. Connect appropriate ductwork to the furnace outlets for even heat distribution throughout your RV.

Basic fittings and a detailed installation manual are included with the unit to guide the installation process.

5. Operating Instructions

The Suburban NT-20S RV Furnace is controlled by a wall thermostat.

NOTE ON FUEL TYPE: While some product specifications may list 'Electric' as the fuel type, this RV furnace is primarily designed to operate on propane gas, typical for RV heating systems. Please verify your specific model's fuel requirements and ensure the correct fuel source is connected.

1. Ensure Gas Supply: Confirm that your RV's propane tanks are open and have sufficient fuel.
2. Power On: Ensure the 12-volt DC power supply to the furnace is active.
3. Set Thermostat: Adjust the wall thermostat to your desired temperature setting. The furnace will automatically initiate its ignition sequence.
4. Ignition Sequence: The solid-state electronic ignition will attempt to light the burner. You may hear the blower fan start, followed by a clicking sound as the igniter sparks. Once the burner lights, the fan will continue to run, circulating warm air.
5. Automatic Operation: The furnace will cycle on and off automatically to maintain the set temperature.
6. Shutting Off: To turn off the furnace, lower the thermostat setting below the ambient temperature or switch the thermostat to the "OFF" position.

6. Maintenance

Regular maintenance ensures the longevity and efficient operation of your Suburban NT-20S RV Furnace.

• Annual Inspection: Have a qualified technician inspect the furnace annually, especially before the heating season. This includes checking the heat exchanger, burner, ignition system, and gas connections.
• Clean Air Intake/Exhaust: Periodically check and clean the exterior air intake and exhaust vents to ensure they are free from obstructions (e.g., dirt, leaves, insect nests).
• Blower Motor: Listen for unusual noises from the blower motor. If any are detected, contact a service technician.
• Gas Line Check: Annually check all gas line connections for leaks using a suitable leak detection solution.
• Winterization: If storing your RV in freezing temperatures, ensure the furnace is properly winterized according to your RV's manual and the furnace's specific instructions to prevent damage.

7. Troubleshooting

Before calling for service, review the following common issues and their potential solutions.

For issues not listed here or if troubleshooting steps do not resolve the problem, contact a qualified RV service technician.

8. Specifications

9. Warranty and Support

Warranty Information: For specific warranty terms and conditions, please refer to the warranty documentation included with your product or visit the official Suburban manufacturing website. Warranty coverage typically applies to defects in materials and workmanship under normal use.

Customer Support: If you require technical assistance, service, or have questions regarding your Suburban NT-20S RV Furnace, please contact your authorized dealer or a certified RV appliance technician. They are equipped to provide expert advice and service.