P-K MACH
®
Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: January 3, 2020
Released: January 3, 2020
Patterson-Kelley 2020
All Rights Reserved.
1004905981 P-K MACH C1500H-C4000 Installation and
Owners Manual (Rev F Jan-2020).docx
Page 28
Canadian Minimum Area of Combustion and Ventilation Air Openings
P-K MACH
®
Model #
BTU/Hr
Required Combustion
Air Opening
Ventilation Air
Opening
Input
in
2
mm
2
in
2
mm
2
C-1500H
1,500,000
50
32,258
10
6,452
C-2000H
2,000,000
67
43,226
10
6,452
C-2500
2,500,000
83
53,548
10
6,452
C-3000
3,000,000
100
64,516
10
6,452
C-4000
4,000,000
134
86,451
13.4
8,645
3.4.3 P-K MACH
®
Combustion Air Requirements
The table below summarizes the combustion air requirements for P-K MACH
®
boilers:
P-K MACH
®
Model #
Air Intake Connection
Required SCFM Combustion Air
C-1500
10
”
350
C-2000
10
”
470
C-2500
12”
580
C-3000
12”
696
C-4000
12”
928
3.4.4 Direct Vent / Sealed Combustion Installations
The P-K MACH
®
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 th
rough 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. 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.
