22
AIR SUPPLY FOR COMBUSTION
A burner shall not be installed in an area where normal air circulation or infiltration is limited and it restricts the amount of
air necessary for proper combustion and venting. When the heating appliance is installed in a confined space, two
permanent air openings shall be provided; one near the top of the enclosure and one near the bottom. Each opening shall
have a free area of no less than one square inch per 1000 Btu/hr (140 square inch per gal/hr) of the total input rating of all
the appliances in the space. When the house is of unusually tight construction, has a kitchen ventilating system, exhaust
fans, clothes dryer or vented fireplaces, it is recommended that combustion air be supplied through two permanent
openings. The openings should connect directly, or by means of ducts, with outdoors or to such spaces (attic or crawl)
that are exposed to the outdoors. For additional information, refer to ANSI standard NFPA31.
NOZZLE AND AIR CONE SELECTION
The EHASR, EHA, and EH oil burners typically fire well with a solid or semi-solid nozzle with a spray angle of 80, 70, or
60 degrees. In most upgrading or conversion installations, the use of an 80 degree solid nozzle is a good starting point.
Always use the proper nozzle size, spray cone type and spray angle the appliance manufacturer recommends. Should
this information not be available, your own good judgment will prevail. Under no circumstances attempt to fire the EHA or
EHASR oil burners under their 0.75 gal/hr minimum input rating or over their 3.00 gal/hr maximum input rating. Under no
circumstances attempt to fire the EH oil burner under its 3.00 gal/hr minimum input rating or over its 6.00 gal/hr maximum
input ratings.
NOZZLE INSTALLATION
In order to install or change the nozzle, the oil gun assembly needs to be removed from the burner. The EHASR, EHA,
and EH burners has an arrow decal that lines up with the leading edge of the oil gun slot cover plate. This will help with re-
installing the oil gun in the proper position once the nozzle has been installed. See Figure 6 for part identification.
Figure 6
–
EH/ EHASR Side View of Oil Gun Slot Plate Cover
1. Locate the slot plate cover, loosen the brass oil assembly nut with a 7/16 inch wrench at the connection with the brass
fitting on the solenoid valve, but do not remove all the way. (Figure 7 on page 23).
Note-For pumps with combination solenoid valves disconnect the oil line from the brass elbow fitting installed in the
nozzle port of the pump.
Arrow
Decal
Slot
cover
plate
