Gas Fired Boiler
20
Harsco Industrial, Patterson-Kelley Technical Service 1.877.728.5351
3.5.2 Combustion
Air
Materials
and
Sizes
The air intake duct can be fabricated from PVC, CPVC, single wall galvanized steel, or other suitable materials.
The duct must be rigid enough to maintain the full required cross sectional area under all operating conditions.
Proper sealing of the intake ductwork is necessary to prevent infiltration of air from conditioned space. Joints in
PVC or CPVC must be cemented. For galvanized duct, wrap each joint and seam with adhesive aluminum tape
or other sealant. The installation of a bird screen on the intake termination is recommended. Ensure that the
screen does not become blocked with snow, ice, insects etc. Combustion air duct should be designed with
maximum 0.22” w.c. friction loss.
Combustion air must be free from dust, lint, etc. The presence of such materials in the air supplied to the burner
could cause nuisance "Low Air" shutdowns or premature burner failure. The boiler should not be operated during
construction while the possibility of drywall dust, demolition dust, etc. exists.
The combustion air supply must be completely free of chemical fumes which may be corrosive when burned in
the boiler. Common chemicals which must be avoided are fluorocarbons and other halogenated compounds,
most commonly present as refrigerants or solvents, such as Freon®, trichloroethylene, perchloroethylene,
chlorine, etc. These chemicals, when burned, form acids which quickly attack the boiler and the boiler stack. The
result is improper combustion and premature boiler failure.
Refer to
Table 3.5.2
below which summarizes the combustion air requirements for the SONIC boilers. Ensure
the combustion air piping is of sufficient size (and acceptable equivalent length) in order to carry the required
SCFM with a maximum friction loss of 0.22” w.c.
Table 3.5.2
Acceptable Materials for Venting Systems
Manufactured Venting Systems
US and Canada:
AL29-4C Stainless Steel Vent Systems listed and labeled to UL1738 Venting Systems for Gas-Burning
Appliances, Categories II, III, and IV
316L Stainless Steel where certified and warranted by the vent manufacturer for venting of Category II, III, or IV
appliances
P-K SONIC™ Boiler Model
Required SCFM
SC-2000 420
SC-3000
629
SC-4000
839
Summary of Contents for SC-2000
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