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Hydronic Heating Boilers and
Domestic Water Heaters
INSTALLATION
Continued
TABLE - B
Flue Pipe Sizes
Input
Btu/hr
495,000
645,000
745,000
985,000
1,255,000
1,435,000
1,795,000
2,065,000
Vent System Options
This unit has two venting options.
1. Conventional Negative Draft Venting
This option uses a vertical rooftop flue termination.
Combustion air is supplied from the mechanical room. See
page 13 for detailed information.
Minimum Recommended Combustion Air Supply To Boiler Room
Boiler Input
495,000
645,000
745,000
985,000
1,255,000
1,435,000
1,795,000
2,065,000
*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 units in the boiler room will require
an increase in the net free area to supply adequate combustion air for all units. Combustion air requirements are based on the latest edition of the National Fuel Gas Code, ANSI
Z223.1, in Canada refer to CAN/CGA-B149 Installation Code. Check all local code requirements for combustion air.
Flue
Size
6"
8"
8"
10"
12"
12"
14"
14"
Combustion Air Source
Outside Air*/2 Openings
2
2
125 in
(806 cm
)
163 in
2
(1052 cm
2
)
188 in
2
(1213 cm
2
)
248 in
2
(1,600cm
2
)
315 in
2
(2,032cm
2
)
360 in
2
(2,323cm
2
)
450 in
2
(2,903cm
2
)
518 in
2
(3,342cm
2
)
2. Outdoor Installation Venting
This option uses the installation of special air inlet and vent
caps on the unit. See page 13 for venting details.
All units are shipped from the factory equipped for
conventional negative draft venting. All other optional vent
systems require the installation of specific vent kits and
venting materials. The following is a detailed explanation of
the installation requirements for each venting system,
components used and part numbers of vent kits for each model.
Barometric Damper Location
Any venting system option that requires a barometric damper
must adhere to the following directions for optimum
performance.
The preferred location for the barometric damper is in a tee or
collar installed in the vertical pipe rising from the unit's flue
outlet. The barometric damper MUST NOT be installed in a
bull head tee installed on the unit's flue outlet. The tee or collar
containing the barometric damper should be approximately
three feet vertically above the connection to the unit's flue
outlet. This location ensures that any positive velocity pressure
from the unit's internal combustion fan is dissipated and the
flue products are rising due to buoyancy generated from the
temperature of the flue products. Adjust weights on damper to
ensure that draft is maintained within the specified ranges.
TABLE–C
Outside Air*/1 Opening
167 in
2
(1077 cm
217 in
2
(1400 cm
250 in
2
(1613 cm
330 in
2
(2,129cm
420 in
2
(2,710cm
480 in
2
(3,097cm
600 in
2
(3,871cm
690 in
2
(4,452cm
12
Inside Air/2 Openings
2
)
500 in
2
(3226 cm
2
)
650 in
2
(4194 cm
2
)
750 in
2
(4839 cm
2
)
990 in
2
(6,388cm
2
)
1260 in
2
(8,130cm
2
)
1440 in
2
(9,291cm
2
)
1800 in
2
(11,614cm
2
)
2070 in
2
(13,356cm
2
)
2
)
2
)
2
)
2
)
2
)
2
)
2
)
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