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1.
Use positive pressure breeching material. Breeching should be short, straight and
full size. Horizontal runs over 10’ or over (2) elbows should be avoided. Runs
should pitch upward at least 1” per foot.
2.
A full size barometric damper should be installed in the breeching to regulate the
drafts. After startup, check the damper and breeching by holding a match near the
edge of the damper. A correct installation will pull the flame with the burner
running.
G.
COMBUSTION AIR
1.
Provide fresh air to support combustion and to supply adequate location
ventilation.
NOTE:
All fuels require approximately 10 cubic feet of standard air (sea level at
60 degrees) per 1000 BTU’s firing rate, for theoretical perfect combustion. In
actual practice, a certain amount of excess air is required to ensure complete
combustion, but this can vary substantially with specific job conditions. Additional
air is lost from the boiler room through barometric dampers, draft diverters and
similar venting devices. It is generally accepted that ½ square inch of free air
opening (for each gas or oil burner in the room) per 1000 BTU/hr firing rate will be
adequate.
2.
After startup, test to assure a positive boiler room pressure with the Boiler
operating at 100% input.
CAUTION: Under no circumstances should a boiler room be under negative
pressure. If combustion air is ducted to the burner, make sure the duct size is
adequate to assure proper burner operation.
III. START-UP
A.
PRE-STARTUP CHECKS
1.
Piping Connections
Are they complete and correct?
2.
Pumps
Are the feed pumps functional?
Is the motor rotation correct?
3.
Electrical
