Lochinvar Power-Fin 502 Installation & Operation Manual page 11
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1
Determine unit location
2.
If combustion and ventilation air is taken from the
outdoors using a duct to deliver the air to the
equipment room, each of the two openings should be
sized based on a minimum free area of one square inch
per 2000 Btu/hr (11 cm
Figure 1-4_Combustion Air from Interior Space
3.
If air is taken from another interior space, each of the
two openings specified above should have a net free
area of one square inch for each 1000 Btu/hr (22 cm
per kW) of input, but not less than 100 square inches
(645 cm
2
) (see FIG. 1-4).
*Outside Air from
2 Openings Directly from
Model
Outdoors
Number
Top
Opening, in
2
125
502
(807 cm
2
)
188
752
(1213 cm
2
)
250
1002
(1613 cm
)
2
325
1302
(2097 cm
)
2
375
1501
(2420 cm
)
2
425
1701
(2742 cm
2
)
500
2001
(3226 cm
2
)
*Outside air openings shall directly communicate with the outdoors. When combustion air is drawn from the outside through a
duct, the net free area of each of the two openings must have twice (2 times) the free area required for Outside Air/2 Openings.
The above requirements are for the boiler only; additional gas fired appliances in the equipment room will require an increase in
the net free area to supply adequate combustion air for all appliances.
per kW) of input (see FIG. 1-3).
2
MINIMUM RECOMMENDED COMBUSTION
AIR SUPPLY TO EQUIPMENT ROOM
*Outside Air from
1 Opening Directly
Bottom
from Outdoors, in
Opening, in
2
125
167
(807 cm
2
)
(1077 cm
188
250
(1213 cm
2
)
(1613 cm
250
333
(1613 cm
)
(2149 cm
2
325
433
(2097 cm
)
(2794 cm
2
375
500
(2420 cm
)
2
(3226 cm
425
567
(2742 cm
2
)
(3658 cm
500
667
(3226 cm
2
)
(4303 cm
(continued)
Figure 1-5_Combustion Air from Outside - Single
Opening
4.
If a single combustion air opening is provided to bring
combustion air in directly from the outdoors, the opening
must be sized based on a minimum free area of one square
inch per 3000 Btu/hr (7 cm
be located within 12" (30 cm) of the top of the enclosure
(see FIG. 1-5).
2
TABLE - 1B
Inside Air from
2 Ducts Delivered from
Outdoors
2
Top
Opening, in
Opening, in
2
250
2
)
(1613 cm
2
)
(1613 cm
375
2
)
(2420 cm
2
)
(2420 cm
500
)
(3226 cm
)
(3226 cm
2
2
650
)
(4194 cm
)
(4194 cm
2
2
750
(4839 cm
)
(4839 cm
)
2
2
850
2
)
(5484 cm
2
)
(5484 cm
1000
2
)
(6452 cm
2
)
(6452 cm
Installation & Operation Manual
per kW). This opening must
2
Inside Air from
2 Ducts Delivered from Interior
Space
Bottom
Top
Opening, in
2
2
250
500
2
)
(3226 cm
2
)
375
750
2
)
(4839 cm
2
)
500
1000
)
(6452 cm
)
2
2
650
1300
)
(8388 cm
)
2
2
750
1500
)
(9678 cm
)
2
2
850
1700
2
)
(10968 cm
2
)
1000
2000
2
)
(12904 cm
2
)
Bottom
Opening, in
2
500
(3226 cm
2
)
750
(4839 cm
2
)
1000
(6452 cm
)
2
1300
(8388 cm
)
2
1500
(9678 cm
)
2
1700
(10968 cm
2
)
2000
(12904 cm
2
)
11
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