Lochinvar 000 - 500 Installation & Service Manual page 13
90,000 - 500,000 btu/hr
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1
Determine boiler location
*Outside Air from
2 Openings Directly from
Input
Outdoors
Btu/hr
Top
Opening, in
2
23
90,000
(148 cm
2
)
34
135,000
(220 cm
2
)
45
180,000
(291 cm
2
)
50
199,999
(323 cm
2
)
57
225,000
(368 cm
2
)
68
270,000
(439 cm
2
)
79
315,000
(510 cm
2
)
90
360,000
(581 cm
2
)
100
399,999
(646 cm
2
)
125
500,000
(807 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.
**Combined interior space must be 50 cubic feet per 1,000 Btu/hr input. Buildings MUST NOT be of *"Tight Construction".
For buildings of *"Tight Construction", provide air openings into the building from outside.
*No combustion air openings are needed when the water heater is installed in a space with a volume NO LESS than 50 cubic feet
per 1,000 Btu/hr of all installed gas fired appliances. Buildings MUST NOT be of *"Tight Construction".
* "Tight Construction" is defined as a building with less than 0.40 ACH (air changes per hour).
Vent installations for connection to gas vents or
chimneys must be in accordance with "Vent ing of
Equipment," of the latest edition of the Na tion al Fuel Gas
Code, ANSI Z223.1, in Canada, the latest edi tion of CGA
Standard B149 Installation Code for Gas Burning Appliances
and Equipment or applicable pro vi sions of the local building
codes.
MINIMUM RECOMMENDED COMBUSTION
AIR SUPPLY TO EQUIPMENT ROOM
*Outside Air from
1 Opening Directly
from Outdoors, in
Bottom
Opening, in
2
23
30
(148 cm
2
)
(194 cm
34
45
(220 cm
2
)
(291 cm
45
60
(291 cm
2
)
(388 cm
50
67
(323 cm
2
)
(433 cm
57
75
(368 cm
2
)
(484 cm
68
90
(439 cm
2
)
(581 cm
79
105
(510 cm
2
)
(678 cm
90
120
(581 cm
2
)
(775 cm
100
134
(646 cm
2
)
(865 cm
125
167
(807 cm
2
)
(1,078 cm
(continued)
TABLE - 1B
*Outside Air from
2 Ducts Delivered from
Outdoors
2
Top
Opening, in
2
Opening, in
45
2
)
(291 cm
2
)
68
2
)
(439 cm
2
)
90
2
)
(581 cm
2
)
100
2
)
(646 cm
2
)
113
2
)
(730 cm
2
)
135
2
)
(871 cm
2
)
158
2
)
(1,020 cm
2
)
(1,020 cm
180
2
)
(1,162 cm
2
)
(1,162 cm
200
2
)
(1,291 cm
2
)
(1,291 cm
250
2
)
(1,613 cm
2
)
(1,613 cm
Adequate
combustion
sup plied to the room where the appliance is installed in
accordance with the latest edition of the National Fuel Gas
Code, ANSI Z223.1, in Canada, the latest edition of CGA
Standard B149 Installation Code for Gas Burning Ap pli anc es
and Equipment, or applicable pro vi sions of the local building
codes.
Installation & Service Manual
**Inside Air from
2 Ducts Delivered from
Interior Space
Bottom
Top
2
Opening, in
2
45
100
(291 cm
2
)
(646 cm
2
)
68
135
(439 cm
2
)
(871 cm
2
)
90
180
(581 cm
2
)
(1,162 cm
2
)
100
200
(646 cm
2
)
(1,291 cm
2
)
113
225
(730 cm
2
)
(1,452 cm
2
)
135
270
(871 cm
2
)
(1,742 cm
2
)
158
315
2
)
(2,033 cm
2
)
180
360
2
)
(2,323 cm
2
)
200
400
2
)
(2,581 cm
2
)
250
500
2
)
(3,226 cm
2
)
and
ventilation
Bottom
Opening, in
2
100
(646 cm
2
)
135
(871 cm
2
)
180
(1,162 cm
2
)
200
(1,291 cm
2
)
225
(1,452 cm
2
)
270
(1,742 cm
2
)
315
(2,033 cm
2
)
360
(2,323 cm
2
)
400
(2,581 cm
2
)
500
(3,226 cm
2
)
air
must
be
13
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