Lennox 0F5 119M Oil Furnace Manual
The Lennox 0F5 119M is a high-efficiency oil furnace designed for residential heating applications. This unit features advanced combustion technology, durable construction, and reliable performance for consistent home heating. Below are key sections covering safety, installation, operation, maintenance, and troubleshooting.
Safety Precautions
Critical safety information for proper installation and operation.
| Hazard | Precaution |
|---|
| Fire/Explosion | Keep combustible materials away from furnace |
| Carbon Monoxide | Ensure proper venting and annual inspection |
| Electrical Shock | Disconnect power before servicing |
| Burns | Allow furnace to cool before maintenance |
| Fuel Leaks | Inspect oil lines regularly for damage |
Installation Guidelines
Proper installation procedures for optimal performance.
- Location: Install in dry, well-ventilated area with adequate clearance.
- Foundation: Place on solid, level surface capable of supporting unit weight.
- Venting: Follow local codes for chimney or vent pipe installation.
- Oil Supply: Install proper oil line with filter and shut-off valve.
- Electrical: Connect to dedicated circuit with proper grounding.
WARNING! Installation must be performed by qualified technician only.
Technical Specifications
- Model: 0F5 119M Oil Furnace
- Fuel Type: No. 2 Heating Oil
- Input Capacity: 119,000 BTU/hr
- Efficiency: Up to 85% AFUE
- Nozzle Size: 0.75 GPH at 100 PSI
- Motor: 1/3 HP, 115V
- Dimensions: 30" H x 21" W x 28" D
- Weight: 185 lbs
Operating Instructions
Daily operation and seasonal startup procedures.
- Thermostat Setting: Set to desired temperature (minimum 68°F recommended).
- Power On: Ensure main power switch is in ON position.
- System Check: Listen for proper ignition sequence.
- Emergency Shutoff: Use red emergency switch if abnormal operation occurs.
- Seasonal Startup: Professional service recommended before heating season.
CAUTION! Never attempt to repair while unit is operating.
Maintenance Procedures
Regular maintenance schedule for optimal performance.
| Maintenance Task | Frequency |
|---|
| Replace oil filter | Annually |
| Clean combustion chamber | Annually |
| Inspect heat exchanger | Annually |
| Check nozzle and electrodes | Annually |
| Lubricate motor bearings | As needed |
Control System Overview
Primary control components and their functions.
- Primary Control: Beckett or Carlin control box with safety lockout
- Thermostat: 24V control circuit with heat anticipator
- Limit Control: Prevents overheating
- Cad Cell: Monitors flame presence
- Stack Switch: Additional safety shutoff
Venting Requirements
Proper venting specifications for safe operation.
- Chimney: Minimum 6" diameter, properly lined and insulated
- Vent Pipe: Type L vent pipe, secured with screws
- Clearance: Maintain 1" clearance to combustible materials
- Draft: 0.02 to 0.06 inches water column
- Barometric Damper: Properly adjusted for stable draft
Fuel System Components
Oil delivery system components and maintenance.
- Oil Pump: Single or two-stage, 100 PSI operating pressure
- Filter: Replaceable cartridge type
- Nozzle: Hollow cone, 80° spray pattern
- Line Size: 3/8" OD copper tubing
- Tank Requirements: Indoor or outdoor, properly vented
Electrical Connections
Wiring diagram and electrical specifications.
- Power Supply: 115V, 60Hz, 15 amp dedicated circuit
- Grounding: Proper equipment grounding required
- Low Voltage: 24V thermostat circuit, polarity sensitive
- Motor: PSC type, thermally protected
- Safety Circuits: Series connected for proper shutdown
Troubleshooting Guide
| Symptom | Possible Cause | Corrective Action |
|---|
| No ignition | No fuel, faulty ignition | Check oil supply, inspect electrodes |
| Short cycling | Dirty filter, poor draft | Replace filter, check venting |
| Smoke/odor | Improper combustion | Adjust air shutter, clean chamber |
| Lockout | Safety circuit open | Reset control, check cad cell |
| No heat | Thermostat, power issue | Check thermostat setting, circuit breaker |
Service Contact: 1-800-9-LENNOX; www.lennox.com
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