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AIR SUPPLY FOR COMBUSTION
A burner shall not be installed in an area where facilities for normal air circulation or infiltration are so limited as to inter-
fere with ready obtainment of all air necessary for proper combustion and venting. When the heating appliance is
installed in a confined space, two permanent openings shall be provided. One near the top of the enclosure and one
near the bottom. Each opening shall have a free area of not less than one square inch per 1000 BTU per hour (140
square inch per gph) of the total input rating of all the appliances in the enclosure. When the house is out of unusual-
ly tight construction, has a kitchen ventilating system, exhaust fans, clothes dryer or vented fireplaces, it is recom-
mended that combustion air be supplied through two permanent openings. The openings shall communicate directly,
or by means of ducts, with outdoors or to such spaces (attic or craw) that freely communicate with outdoors. For addi-
tional information, refer to ANSI standard NFPA 31.
CHIMNEY
Follow the recommendations of the appliance manufacturer. A chimney shall be capable of producing a draft as
required by the appliance and as recommended by the appliance manufacturer. It must be properly designed, of ade-
quate size, and should be above the surrounding objects, tile-lined, with no obstructions, and be in good state of repair.
The smoke pipe should set flush with the inside of tile and be cemented in place. All cleanout doors should be sealed.
A draft inducer may be used to overcome inadequate draft conditions. If a draft inducer is used, provisions must be
made to insure the burner does not operate if the draft inducer fails.
DRAFT REGULATORS
A draft regulator shall be provided unless otherwise specified by the appliance manufacturer. The draft regulator shall
be installed in accordance with local codes and regulations or in the absence of local codes, with the American National
Standard NFPA31. Refer to appliance manufacturer's instructions for recommended overfire and stack draft.
NOZZLE AND AIR CONE SELECTION
The EHA, EH and EHASR 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 the best way to start
with. 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 judgement will prevail. Under no circumstances attempt to fire
the EHA or EHASR oil burners under their 0.75 gph minimum or over their 3.00 gph maximum. Under no circumstances
attempt to fire the EH oil burner under its 3.00 gph minimum or over its 6.00 gph maximum input ratings.
EH Mod Pak Air Tube/gun Assembly Combinations are built with a 3.00 to 4.50 GPH P-4 as standard. To convert
to the 5.00 to 6.00 GPH P-7 rating:
1. Change the 3-1/4" I.D. cast iron cone (EH 12990) installed to the 3-9/16" I.D. cast iron air cone (EH 13003)
supplied.
2. To change air cones, remove the phillips head counter sunk 8-32 screw securing the existing air cone in the
air tube end, remove the air cone.
3. Install the larger air cone.
4. Adjust flamelock on gun assembly ahead of air cone face: 1/8" ahead for 3.00 to 4.50 GPH (UL rate P-4) rat-
ing, 1/4" ahead for 5.00 to 6.00 GPH (UL rate P-7) rating.
Once the proper cast air cone has been installed the nozzle can be installed from the air tube end into the
Flamelock/nozzle adaptor. Thread the nozzle into the adaptor finger tight then tighten securely with a nozzle
wrench. CAUTION: Do not over tighten. At this time position the Flamelock face forward of the cast iron air cone
face as shown in figure 00. To position the Flamelock gun assembly forward, loosen the gun assembly 3/8-24 hex
lock nut and 5/16" hex slotted slot cover screw. Once in the the required position, retighten the hex lock nut and
slot cover screw, move and align arrow decal with slot plate cover for Flamelock gun assembly position reference
(see Figure 3, page 6).
To remove a gun assembly once the burner has been installed on the appliance, remove the copper oil line where it
attaches with the gun assembly oil line adaptor fitting and remove the 9/16" hex gun assembly locknut. Next, remove the
ignition transformer hold down the clip and 5/16-18 hex slotted screw on the top right of the burner and swing open the
ignition transformer to the left. Now grasp the rear of the gun assembly where the oil line fitting adaptor exits thru the
housing and pull the oil line adaptor to the right out of the housing slot and slot plate cover. Gently lift, do not force, the
rear of the gun assembly, rotating the oil line fitting adaptor up at 45 degrees pulling the entire gun assembly out of the
housing opening.
Remove and install finger tight in the regular or Flamelock™ nozzle adaptor, then securely tighten nozzle with a nozzle
wrench. Check electrodes for proper position (see Figure 1, page 6). Reinstall the Flamelock gun assembly into the burn-
er by repeating the above steps for removal in reverse order. Once reinstalled, securely tighten the 3/8-24 hex gun
assembly lock nut and the 7/16" hex oil line flare nut to the oil line fitting adaptor.
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