321 Studios FLF110D48E Combustion Air Requirements, Spacing Of Electrodes, Removing Gun Assembly

SPACING OF ELECTRODES

The electrodes should be spaced 5/32” apart. They should extend 1/16” beyond the end and 5/16” above the center of the nozzle tip as shown in Figure 10.

GUN ASSEMBLY ADJUSTMENT

The gun assembly can be adjusted in the slot inside of fan housing by loosening screw holding slot cover in position. Nozzle tip should ordinarily be located 1-1/8” behind the front face of the cone.

REMOVING GUN ASSEMBLY

Disconnect the oil line at the fan housing and remove lock nuts on copper tube fitting. Loosen igniter hold down clamps, then swing igniter up and backward. Gun assembly can now be removed through this opening.

COMBUSTION AIR REQUIREMENTS

This furnace must be installed in a location where a sufficient supply of combustion air is available for the complete combustion of the fuel oil. Keep in mind that a certain amount of excess air is required as well to ensure complete combustion of the fuel oil.

When structures are constructed too tightly to supply sufficient combustion air, air from outside the structure is required to be brought in directly to the furnace. This furnace has been conveniently designed to accept a combustion air boot which is attached directly to the outdoors by means of a 4” pipe. This pipe can be rigid or flexible, but it is recommended that a metallic material be used. Refer to Figure 11. The air boot used for this design is a Field Controls model number CAS-2B-90E that can be purchased through your local distributor. Follow all installation procedures as specified in the instructions packaged with the air boot kit.

FIGURE 10

ELECTRODE ADJUSTMENTS

1-1/8

5/32 GAP

5/16

1/16NOZZLE

MIS-160

Manual 2100-422

Page 20