Suburban SF 30F Furnace Manual

The Suburban SF 30F is a high-efficiency forced air furnace designed for RV and mobile home applications. This 30,000 BTU furnace features electronic ignition, variable speed blower, multi-position installation capability, and operates on propane/LP gas. 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 Gas Supply 7. Operating Instructions 8. Maintenance Procedures 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Burner assembly, heat exchanger, blower motor, electronic ignition system, gas valve, thermostat connection, combustion air intake, and exhaust outlet.

Feature	Description
BTU Rating	30,000 BTU/hour output
Fuel Type	Propane/LP Gas
Ignition System	Electronic spark ignition
Blower Type	Variable speed DC motor
Installation	Multi-position (floor, wall, ceiling)
Efficiency	High-efficiency heat exchanger
Safety Features	Flame rollout switch, overheat protection
Gas Connection	1/2" NPT gas inlet
Electrical	12V DC operation
Dimensions	Compact design for RV applications

Installation

Unpack and inspect contents. Ensure proper clearances and ventilation.

Select installation location: Ensure minimum clearances to combustibles as specified.
Mount furnace: Secure using provided brackets and hardware.
Connect gas supply: Use approved gas line and fittings; pressure test for leaks.
Connect electrical: Wire to 12V DC power source and thermostat.
Install venting: Connect combustion air intake and exhaust flue per code requirements.

WARNING! Installation must be performed by qualified technician. Gas leaks can cause explosion or fire.

First-Time Setup

Complete installation checks before initial startup.

Gas pressure check: Verify inlet and manifold pressures per specifications.
Ventilation check: Ensure proper airflow and combustion air supply.
Electrical check: Verify proper voltage and polarity.
Initial startup: Follow lighting instructions; check for proper flame.
System calibration: Adjust thermostat and blower settings as needed.

CAUTION! Never operate without proper ventilation. Carbon monoxide poisoning hazard.

Specifications

Model: SF 30F
BTU Output: 30,000 BTU/hour
Fuel: Propane/LP Gas
Input Voltage: 12V DC
Gas Connection: 1/2" NPT
Efficiency: High-efficiency heat exchanger design
Blower: Variable speed DC motor
Ignition: Electronic spark ignition
Dimensions: Compact RV design
Weight: Approximately 28 lbs
Certifications: ANSI Z21.44, CSA 2.24

Controls and Settings

Primary control via thermostat. Internal controls include gas valve, blower control board, and safety switches.

Thermostat Settings: HEAT/COOL/OFF fan control, temperature setpoint.

Internal Controls: Gas valve with manual shutoff, blower speed adjustment, limit switches, pressure regulator.

Safety Features: Flame rollout switch, high limit switch, pressure switch, ignition control module.

Connecting Gas Supply

Use approved gas piping materials and follow local codes.

Shut off main gas supply before connecting.
Use pipe thread sealant approved for LP gas.
Pressure test all connections for leaks using soap solution.
Verify gas pressure at manifold (typically 11" WC for LP).
Ensure adequate gas supply line size for proper operation.

Tip: Always use two wrenches when connecting gas lines to prevent damage.

Operating Instructions

Normal operation sequence: Thermostat call for heat → ignition sequence → burner operation → blower activation.

Set thermostat to desired temperature above room temperature.
Furnace will initiate ignition sequence (spark ignition).
Once flame is established, main burner will operate.
Blower will activate after heat exchanger warms up.
When thermostat is satisfied, burner shuts off and blower continues for cool-down.

WARNING! If you smell gas, shut off immediately and call for service.

Maintenance Procedures

Regular maintenance ensures safe and efficient operation.

Annual inspection by qualified technician.
Clean burner assembly and heat exchanger.
Check and clean flame sensor.
Inspect venting system for obstructions.
Lubricate blower motor if required.
Check all safety controls and switches.

Care & Cleaning

Keep furnace area clean and free of combustible materials.

Exterior: Wipe with damp cloth only. Interior: Vacuum dust and debris from burner area and blower assembly.

CAUTION! Never use water or cleaning solvents on electrical components.

Regulatory Information

This furnace complies with ANSI Z21.44 and CSA 2.24 standards for gas-fired recreational vehicle heaters. Manufactured to meet industry safety standards. For technical support or service, contact Suburban Manufacturing Company or authorized service centers.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No ignition	Gas supply, ignition system	Check gas valve; verify spark at electrode; check wiring.
Blower not running	Motor, control board, limit switch	Check voltage to motor; verify limit switch closure; inspect control board.
Short cycling	Dirty filter, high limit	Replace air filter; check for restricted airflow; verify proper gas pressure.
No heat output	Thermostat, gas valve	Verify thermostat call for heat; check gas valve operation; inspect flame sensor.
Unusual odors	Dust buildup, combustion issues	Clean heat exchanger; check for proper combustion; inspect venting.

Reset: Turn power off for 30 seconds to reset control board.

Service: Contact authorized Suburban service center for professional repair.