Suburban NT30SP Furnace Manual

The Suburban NT30SP is a 30,000 BTU forced air furnace designed for RV and mobile home applications. This direct spark ignition furnace features a compact design, efficient heating performance, and safety shut-off systems. 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 7. Operating Instructions 8. Maintenance Procedures 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Compact furnace unit, wall thermostat, combustion air intake, heat exchanger, blower assembly, and safety shut-off valve.

Feature	Description
Heating Capacity	30,000 BTU/hour output
Ignition System	Direct spark ignition
Fuel Type	Liquid Propane (LP) gas
Air Flow	Forced air circulation
Thermostat Control	Wall-mounted temperature control
Safety Features	Overheat protection, flame failure detection
Power Requirements	12V DC operation
Exhaust System	Sealed combustion chamber
Dimensions	Compact design for RV installation
Weight	Lightweight construction

Installation

Unpack and inspect contents. Ensure proper ventilation and clearance.

Select installation location: Choose area with adequate combustion air and exhaust clearance.
Mount furnace: Secure to floor or mounting bracket using provided hardware.
Connect gas line: Use approved LP gas line and fittings; check for leaks.
Connect electrical: Wire to 12V DC power source and thermostat.
Install venting: Connect combustion air intake and exhaust pipes.

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 pressure check: Verify LP gas pressure at 11 inches water column.
Electrical connection: Ensure proper 12V DC polarity and grounding.
Ventilation check: Confirm combustion air intake and exhaust are unobstructed.
Test operation: Set thermostat to call for heat; observe ignition sequence.
Check flame: Verify steady blue flame pattern.

CAUTION! Never operate without proper ventilation. Test carbon monoxide detector before use.

Specifications

Heating Capacity: 30,000 BTU/hour
Fuel Type: Liquid Propane (LP) gas
Ignition: Direct spark ignition
Power Supply: 12V DC
Gas Pressure: 11 inches water column
Air Flow: 120 CFM maximum
Dimensions: Compact RV design
Weight: Approximately 25 lbs
Efficiency: High-efficiency heat exchanger
Safety Controls: Overheat protection, flame failure

Controls and Settings

Primary control through wall thermostat. Furnace includes internal safety controls and diagnostic LED.

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

Furnace Controls: Manual reset button, diagnostic LED (flashes error codes), gas valve control. Internal settings: Blower delay timing, high limit temperature setting, ignition trial timing.

Connecting to Power

12V DC power connection requirements.

Turn off all power sources before connecting.
Connect positive and negative wires to appropriate terminals.
Ensure proper fuse protection (15 amp recommended).
Connect thermostat wires according to wiring diagram.
Verify ground connection for safety.

Tip: Use marine-grade wire and connectors for RV applications.

Operating Instructions

Normal heating operation sequence.

Set thermostat: Adjust to desired temperature above room temperature.
Ignition sequence: Blower starts, spark ignition begins, gas valve opens.
Flame detection: Sensor confirms flame; spark stops.
Heating operation: Blower continues circulating warm air.
Shutdown: When thermostat satisfied, gas valve closes, blower continues for cool-down.
Manual override: Use emergency heat switch if available.

WARNING! Never block air intake or exhaust. Monitor for proper flame color (blue).

Maintenance Procedures

Regular maintenance ensures safe and efficient operation.

Annual inspection: Check heat exchanger for cracks or corrosion.
Clean burner assembly: Remove dust and debris from burner.
Check flame sensor: Clean with emery cloth if dirty.
Lubricate blower motor: If required by manufacturer specifications.
Test safety controls: Verify proper operation of limit switches.

CAUTION! Disconnect power and gas supply before performing maintenance.

Care & Cleaning

Regular cleaning maintains efficiency and safety.

Clean exterior surfaces with damp cloth. Keep area around furnace clear of combustible materials. Clean air intake and exhaust vents regularly. Check and clean air filter if equipped.

CAUTION! Do not use chemical cleaners near gas connections. Keep electrical components dry.

Regulatory Information

ANSI Z21.44: Certified for recreational vehicle use. CSA 4.3: Meets Canadian standards for gas-fired appliances. EPA compliant for emissions. For technical support, contact Suburban Manufacturing Company or visit www.suburbanrv.com. Customer service: 1-800-782-2201.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No ignition	Power/gas supply	Check 12V power; verify gas valve open; check spark electrode gap.
Blower runs, no heat	Ignition failure	Check flame sensor; verify gas pressure; inspect burner.
Furnace cycles on/off	Overheating	Check air flow; clean filter; verify proper ventilation.
Error code flashing	System fault	Count LED flashes; refer to diagnostic chart in manual.
Gas odor	Leak or incomplete combustion	Shut off immediately; check for leaks; verify proper combustion air.

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

Service: 1-800-782-2201; www.suburbanrv.com