Operating instructions

4. The vent pipe connection should be as short as possible.
5. Maintain clearances for fire safety as well as servicing. Refer to Fig. 3 for minimum clearances. An 18-in. clearance must be maintained
at a side where passage is required to access another side for cleaning, servicing, inspection, or replacement of any parts that normally may
require such attention. Boilers must be installed at least 6-in. from combustible materials on all sides and above. Allow at least 24-in. front
clearance for servicing. Allow at least 18-in. right-side clearance for servicing boilers equipped with a tankless coil.
6. Fresh air for combustion must be available at front of boiler. Fresh air for ventilation must be available to front AND rear of boiler. Air
passages must be free of obstructions at all times. Ventilating and combustion air must enter boiler room without restrictions.
7. Be sure installation is in accordance with the requirements of local authorities having jurisdiction. Compliance with these regulations is
required. In the absence of local codes, follow NFPA 31—Installation of Oil Burning Equipment.
INSTALLATION
PROCEDURE 1—INSTALLATION REQUIREMENTS
Refer to Fig. 4 for the basic requirements of a typical installation.
NOTE: Always keep manual fuel supply valve shut off if burner is shut down for an extended period of time.
PROCEDURE 2—FRESH AIR FOR COMBUSTION
WARNING: Be sure to provide enough fresh air for combustion. Enough air ensures proper combustion and
ASSURES THAT NO HAZARD WILL DEVELOP DUE TO LACK OF OXYGEN. Failure to follow this warning can cause a fire,
personal injury, or death.
CAUTION: Air for combustion must not be contaminated by halogen compounds, which include fluoride, chloride,
bromide, and iodide. These elements are found in aerosol sprays, detergents, bleaches, cleaning solvents, salts, air
fresheners, and other household products. Excessive exposure to contaminated combustion air will result in safety and
performance related problems.
CAUTION: If a fireplace or a kitchen or bathroom exhaust fan is used, an outside air intake should be installed. These
devices rob the boiler and water heater of combustion air.
Enough fresh air must be provided to assure proper combustion. The fire in the boiler uses oxygen. It must have a continuous supply. The air in
a house contains only enough oxygen to supply the burner for a short time. Outside air must enter the house to replace that used by the burner.
The exact fresh air requirements depend on whether the boiler is located in an unconfined or confined space.
A. Boiler Located in Unconfined Space
An unconfined space is defined as a space with volume not less than 50 cu ft per 1000 Btuh of total input rating of all appliances installed in that
space.
If boiler is in an open area (unpartitioned basement) in a conventional house, air that leaks through cracks around doors and windows will usually
be adequate to provide air for combustion. The doors should not fit tightly. Cracks around windows should not be caulked.
B. Boiler Located in Confined Space
ALL AIR FROM INSIDE BUILDING
The confined space shall be provided with 2 permanent openings communicating directly with an additional room(s) of sufficient volume so that
the combined volume of all spaces meets the criteria for an unconfined space. The total input of all combustion equipment installed in the combined
space shall be considered in making this determination. Each opening shall have a minimum free area of 1 sq in. per 1000 Btuh of total input rating
for all combustion equipment in the confined space, but not less than 100 sq in. One opening shall be within 12 in. of the top and 1 within 12 in.
of the bottom of the enclosure. (See Fig. 5.)
Fig. 2—Dimensional Drawing
A96152
A
19
5
⁄
8
″
GAGE
36″
1
1
⁄
4
IN.
RETURN
1
1
⁄
4
IN. SUPPLY
AQUASTAT
CONTROL
(WITHOUT COIL)
AQUASTAT
CONTROL
(WITH COIL)
TANKLESS
HEATER
1
⁄
2
IN. N.P.T.
9″
C B
3
⁄
4
IN.
ASME
RELIEF
VALVE
FRONT SIDE REAR
—6—