Harsco Industrial SC-2000, Installation & Owner'S Manual

Page: 22 / 69

Gas Fired Boiler
Harsco Industrial, Patterson-Kelley Technical Service 1.877.728.5351
22
3.5.2.2 Air Inlet Requirements – Canada (CAN/CSA B149.1)
A. Ventilation of the space occupied by fuel burning appliance(s) or equipment shall be supplied by a
ventilation opening at the highest practicable point communicating with the outdoors. The total cross sectional
area of the ventilation opening must be either 10% of the net free area required for combustion air or 10 sq. in.
(6500 mm
2
), whichever is greater.
B. Use the following opening calculation for P-K SONIC™ boilers:
When combustion air is supplied for a forced draft burner by natural airflow
from the outdoors and there is no draft regulator or draft hood in the same
space, there shall be a permanent opening with a cross sectional area not
less than 1 sq. in/30,000 Btu/Hr (70 mm
2
/kW) of the total rated input to the
burner(s). This opening must not interfere with the ventilation air opening
defined in paragraph A.
C. Use the following opening calculation for
P-K THERMIFIC®
boilers or other natural draft or fan-assist appliances:
When combustion air is supplied for natural or fan-assisted burners by
natural airflow from the outdoors, there shall be a permanent opening with
a cross sectional area not less than 1 sq. in/7000 Btu/Hr (321 mm
2
/kW) up
to and including 1,000,000 Btu/Hr plus 1 sq. in./14,000 Btu/Hr (155 mm
2
/kW)
in excess of 1,000,000 Btu/Hr. This opening must be either located at or
ducted to a point not more than 18 in. (450 mm) or less than 6 in. (150 mm)
above floor level. This opening is in addition to the ventilation air opening
defined in paragraph A.
D. When combustion air is supplied by natural airflow into a space containing both types of appliance described
in paragraphs B and C, the cross sectional area of the opening shall not be less than the sum of the cross
sectional areas for all appliances in the space as calculated by the applicable method. This opening is in addition
to the ventilation air opening defined in paragraph A.
E. When a duct is used to meet the requirement for combustion air supply, as described in paragraphs A through
D, above, the opening of the duct shall be located so there is no possibility of cold air affecting steam or water
piping, electrical equipment or mechanical equipment.
F. When combustion air is supplied by mechanical means, an airflow-sensing device must be installed. It must
be wired into the pre-ignition limit c to prevent the burner from starting or to stop an operating burner in case of
air supply failure.
G. When all combustion air is supplied through a make-up air heater, and the appliance is interlocked to the
heater, the requirements of paragraphs A through F do not apply.
Table 3.5.2.2 Canadian Minimum Area of Combustion and Ventilation Air Openings
P-K SONIC™ Boiler Required Combustion Air Opening Ventilation Air Opening
Model Input (Btu/Hr) in
2
mm
2
in
2
mm
2
SC-2000 2,000,000 667 43,032 67 4,303
SC-3000 3,000,000 100 64,516 10 6,452
SC-4000 4,000,000 134 86,451 13.4 8,645
N
OTE
:
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 ¼”.
3. Motorized louvers shall be
interlocked with the appliance so that
they are proven open prior to main
burner ignition and operation.