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1.
The free area of a combustion air supply opening is calculated by deducting the blockage area
of any fixed louvers, grilles or screens from the total area of the opening.
2. Screens shall be not smaller than 1/4 inch.
3. Motorized louvers shall be interlocked with the appliance so that they are proven open prior to
main burner ignition and operation.
®
P-K SONIC
The table below summarizes the combustion air requirements for P-K SONIC
®
P-K SONIC
Model #
SC-1500
SC-2000
SC-3000
SC-4000
Direct Vent / Sealed Combustion Installations
®
The P-K SONIC
series boilers are certified for operation in direct vent / sealed combustion systems,
which feature combustion air intake ductwork which sources the combustion air supply from outdoors.
The flow of combustion air through this ductwork is maintained by the appliance's combustion blower.
The combustion air intake ductwork can be constructed with PVC, CPVC, single wall galvanized steel,
or other suitable materials. The ductwork must be rigid enough to maintain the full required cross
sectional area under all operating conditions.
NOTE: The combustion air intake ductwork must be sufficiently rigid in order to prevent collapse
due to the potential for negative pressures inside the ductwork. If the ductwork collapses, this will
restrict the combustion air supply to the appliance which may prohibit operation.
Proper sealing of the combustion air intake ductwork is necessary to prevent infiltration of air from
conditioned space. For example, joints in PVC or CPVC piping must be cemented. For galvanized
duct, wrap each joint and seam with adhesive aluminum tape or other sealant. Harsco Industrial
Patterson-Kelley recommends installing a 1" x 1" or larger bird screen on the exterior termination.
Ensure that the screen does not become blocked with snow, ice, insects etc.
The combustion air supply 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
appliance 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 appliance. 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, cause improper
combustion and premature appliance failure due to the formation of acids which quickly attack the heat
exchanger and the flue piping materials.
Revised: June 2, 2017
Released: June 2, 2017
Combustion Air Requirements
Air Intake Connection
HARSCO Industrial, Patterson-Kelley 2017
All Rights Reserved.
NOTES
Required SCFM Combustion Air
12"
12"
12"
12"
1004905978 P-K SONIC NURO Installation and
®
P-K SONIC
Gas Fired Boiler
Technical Service 1.877.728.5351
®
boilers:
350
467
629
839
Owners Manual (Rev F Jun-2017).docx
®
,
Page 24
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