Williamson Oil Furnace Manual

The Williamson Oil Furnace is a high-efficiency heating system designed for residential and light commercial use. This manual covers the W-Series models with advanced combustion technology, electronic ignition, thermal efficiency ratings up to 87%, integrated safety controls, and compatibility with standard thermostat systems. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation Guidelines 3. First-Time Setup 4. Technical Specifications 5. Controls and Settings 6. Connecting Thermostat 7. Operating Procedures 8. Safety Features 9. Maintenance & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Combustion chamber, oil burner assembly, heat exchanger, blower motor, safety controls, filter system, and electronic ignition.

Feature	Description
Combustion Chamber	Heavy-duty steel construction for efficient heat transfer
Oil Burner Assembly	High-pressure nozzle system with adjustable flame
Heat Exchanger	Multi-pass design for maximum heat extraction
Blower Motor	Variable speed for optimized airflow
Safety Controls	Primary limit control, rollout switch, pressure switch
Filter System	Replaceable cartridge filter for oil line
Electronic Ignition	Spark ignition system for reliable startup
Thermostat Connection	Standard 24VAC thermostat terminals
Power Requirements	120V AC, 60Hz operation
Fuel Type	#2 Heating Oil

Installation Guidelines

Professional installation recommended. Ensure proper clearances and ventilation.

Location: Install in well-ventilated area with minimum clearances as specified.
Venting: Connect to approved chimney or vent system per local codes.
Oil Supply: Install oil line with shutoff valve and filter.
Electrical: Connect to dedicated 120V circuit with proper grounding.
Thermostat: Wire to standard 24VAC thermostat system.

WARNING! Installation must comply with local building codes and NFPA standards. Carbon monoxide hazards exist with improper installation.

First-Time Setup

Initial startup must be performed by qualified technician.

System Check: Verify all connections and clearances.
Oil System: Prime oil line and check for leaks.
Combustion Adjustment: Set burner for proper flame pattern and CO2 levels.
Thermostat Calibration: Set temperature differential and cycle rates.
Safety Test: Verify all safety controls function properly.

CAUTION! Never bypass safety controls. Keep combustibles away from furnace.

Technical Specifications

Models: W-80, W-100, W-125, W-150
Heating Capacity: 80,000 - 150,000 BTU/hr
Efficiency: 83% - 87% AFUE
Fuel Consumption: 0.65 - 1.2 GPH at maximum firing rate
Electrical: 120V AC, 60Hz, 5-8 Amps
Blower Capacity: 800 - 1400 CFM
Nozzle Size: 0.75 - 1.50 GPH
Operating Pressure: 100 PSI pump pressure
Dimensions: 28"W x 48"H x 26"D (varies by model)
Weight: 185 - 245 lbs

Controls and Settings

Primary control module with LED status indicators. Access panel for service adjustments.

Control Panel: POWER switch, RESET button, SERVICE light, LIMIT light.

Adjustments: Burner air shutter, pump pressure, thermostat anticipator. Settings: Blower delay-on and delay-off timers, high limit control setting, low fire start option (if equipped).

Connecting Thermostat

Standard 24VAC thermostat connection with R, W, G terminals.

Turn off power to furnace at main disconnect.
Remove control panel access cover.
Connect thermostat wires: R (24V), W (heat), G (fan).
Secure connections and replace cover.
Restore power and test operation.

Tip: Use 18-gauge thermostat wire for runs under 100 feet.

Operating Procedures

Normal operation controlled by thermostat.

Startup: Thermostat calls for heat, ignition sequence begins.
Ignition: Spark igniter activates, fuel valve opens.
Burn: Flame established, blower activates after warm-up delay.
Cycle: Furnace runs until thermostat satisfied.
Shutdown: Fuel valve closes, blower continues for cool-down.

WARNING! Never attempt to manually start burner. If furnace locks out, call for service.

Safety Features

Primary Safety Limit: Shuts off burner if overheating detected. Rollout Switch: Protects against flame rollout. Pressure Switch: Ensures proper venting before ignition. Stack Switch: Monitors flue temperature for safe operation.

Maintenance & Cleaning

Annual professional maintenance required. Monthly filter inspection recommended.

Filter: Replace or clean air filter monthly during heating season.
Nozzle & Electrodes: Replace annually, clean and adjust gap.
Heat Exchanger: Vacuum clean annually.
Blower: Clean blades and housing annually.
Oil Filter: Replace at start of each season.

CAUTION! Disconnect power before servicing. Hot surfaces can cause burns.

Regulatory Information

UL listed and certified to ANSI Z21.47 standards. Complies with EPA requirements for oil-fired heating equipment. Installation must meet NFPA 31 and local codes. For technical support, contact Williamson Heating Systems at 1-800-555-HEAT or visit www.williamsonheating.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, safety lockout	Check power supply; verify thermostat setting; reset primary control.
No heat	Fuel supply, ignition failure	Check oil level; verify nozzle and ignition; check filter.
Short cycling	Dirty filter, limit switch	Replace air filter; check high limit setting; verify airflow.
Smoke or odor	Dirty combustion, improper adjustment	Clean heat exchanger; adjust burner combustion.
Blower not working	Motor, capacitor, control	Check blower motor; test capacitor; verify control settings.

Reset Procedure: Press reset button on primary control once. If furnace continues to lock out, call for service.

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