DIY Oil-Fired Central Heating

Select the proper size oil-fired furnace for cost-efficient operation.

The keys to a successful DIY oil-fired central heating installation are proper planning and execution. An oil-fired central heating system works similarly to a natural gas system. The unit distributes heat to rooms through a ductwork system, but burns oil as the fuel source. Familiarize yourself with the components and attributes of the oil-fired furnace by thoroughly reading and understanding the product manual. Determine the aspects of the project that may require the assistance of an experienced friend, family member or licensed professional.

Things You'll Need

• Oil-fired furnace
• Concrete blocks
• Supply plenum
• Sheet metal screws
• Foil duct tape
• Mastic
• Flue collar
• Chimney pipe connector
• Vent pipe
• Cooper pipe
• Disconnect switch
• Thermostat

Instructions

Preparation

1. Obtain a permit before starting the project. Install the furnace in a basement or utility room in accordance with National Fire Protection Standard for Oil Burning Equipment, NFPA 31 and local building codes for oil-fired furnace installations.

2. Clear the area of any combustible materials, such as paper, plastics or wood. Locate the furnace close to the center of the return air and supply ducts.

3. Elevate the furnace at least 2 inches, on a concrete block or pad, when installing on uneven floor or protecting the unit against flooding.

Ductwork

1. Attach the existing return air ducts or new duct to the pre-cut opening of the furnace blower compartment. Connect the other end of the duct to the return air grill located in the wall or floor.

2. Connect the supply plenum to the flanges on the top of the furnace. The supply plenum is a rectangular-shaped sheet metal box. The heat rises into the plenum from the heat chamber. Attach existing supply ductwork system or new ducts to the plenum.

3. Insert sheet metal screws to secure duct connections. Wrap all joints with foil duct tape. Apply mastic in gap or as needed to ensure airtight ducts.

Vent Pipe

1. Consult the product guide for the proper vent pipe diameter and installation procedures. Install the pipe in as short a distance as possible to the chimney. Limit the number of elbows in the system.

2. Install horizontal runs of vent pipe sloped up toward the chimney. Most local codes require a ¼-inch slope for each linear foot.

3. Follow the instructions for attaching the flue collar to the furnace. Install the chimney connector. Run vent pipe from the flue collar to the chimney connector pipe.

4. Check the connection for a tight seal. Measure the chimney to ensure it extends at least 2 feet above the roof’s peak or any object within a 10-foot radius.

Fuel Line

1. Install the copper fuel line. Refer to the installation manual to determine the pipe diameter. Install a fuel shut-off valve near the furnace and at the oil tank.

2. Adhere to codes for supporting pipes and protecting piping from physical damage. Mark the location of underground pipes.

3. Insert a length of coiled pipe at the oil tank and furnace. These pipes give the fuel line some flexibility.

Electrical

1. Turn off the electricity at the primary electrical panel. Install a separate, dedicated circuit for the furnace. Place a disconnect switch near the furnace. Follow the wiring diagram in the installation manual and local and national codes for making the connections.

2. Position the thermostat inside the living space in the location recommend by the product manufacturer. Choose a location away from drafts, exterior walls or direct sunlight. Run low-voltage wires for the device. Wire and program the device according to the installation manual.

3. Follow the manufacturer’s directions for making electronic and other adjustments. Turn the unit on from the thermostat.

References

• Boyer Town Furnace: Hallmark Oil-Fired Furnace
• Nordyne: Oil Fired Warm Air Furnace
• Energy Savers Oil-Fired Boilers and Furnaces