Patterson-Kelley P-K STORM ST-8000 Installation And Owner's Manual page 39

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. Patterson-Kelley offers an "Air Intake Filter" accessory on the Storm Boilers. If this
accessory is installed, the boiler may be run in these conditions provided that the air filter is installed
and maintained properly.
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.
Sizing the Combustion Air Intake Ductwork
The combustion air flow rate requirements per boiler model are summarized in 3.4.3. When sizing the
combustion air intake ductwork, the pressure drop through this ductwork MUST NOT exceed 0.22"
W.C. for the 2500-4000 and MUST NOT exceed 0.5" W.C. for the 5000-8000 as described in the table
below:
®
P-K STORM Boiler Model
ST-2500, ST-3000, ST-3500,
ST-4000
ST-5000, ST-6000, ST-8000
ST-2500, ST-3000, ST-3500,
ST-4000
ST-5000, ST-6000, ST-8000
If the combustion air intake ductwork and the exhaust vent terminate on the same wall of
NOTE:
the building, they must utilize the same type of termination fitting.
Patterson-Kelley recommends including a motorized combustion air damper in each
NOTE:
appliance's air intake ductwork. Refer to
NOTE: ST-2500-ST-4000: Total combined vent pressure not to exceed 0.44" W.C.
ST-5000-ST-8000: Total combined vent pressure not to exceed 1.0" W.C.
Revised: February 2, 2024
Released: February 2, 2024
Maximum Allowable
Flue Vent Category
through Combustion
II
II
IV
IV
3.4.3 below for
 Patterson-Kelley 2024
All Rights Reserved.
P-K Storm
Technical Service 1.877.728.5351
Pressure Drop
Allowable Vent Pressure
Air Ductwork
0.22" W.C.
0.5" W.C.
+0.01" W.C to +0.44"
0.22" W.C.
0.5" W.C. +0.01" W.C to +1.0" W.C.
more information.
2691000403 P-K Storm ST2500-ST8000
Installation and Owners Manual Rev G.docx
®
Gas Fired Boiler
®
,
-0.01" W.C. to
-0.05" W.C.
-0.01" W.C. to
-0.05" W.C.
W.C.
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