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2
Venting
(continued)
Figure 2-3_Vent termination from flat roof - 10 ft. or
less from parapet wall
Units which are shut down or will not operate may experience freezing due to convective air flow in flue
⚠ CAUTION
pipe, through the air inlet, or from negative pressure in the equipment room. In cold climates, operate pump
continuously to help prevent freezing of boiler water. Provide proper freeze protection. See Freeze Protection,
page 48.
MODEL
497
647
747
987
Installer may increase diameter one pipe size for ease of installation, if needed.
Figure 2-5_Vent system must be sealed
VENT SYSTEM
SEAL JOINT
(I.E., RTV SILICONE)
UNIT OUTLET
Figure 2-4_Vent termination from flat roof - 10 ft. or more
from parapet wall
TABLE 2A
FLUE PIPE SIZES
FLUE SIZE
6''
8''
8''
10''
Vent system options
Vent System Options
This fan-assisted Category 1 unit has two venting options.
1.
2.
1/2"
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
DIR #2000586700 00
used and part numbers of vent kits for each model.
Installation & Service Manual
MODEL
1257
1437
1797
2067
Conventional Negative Draft Venting
This option uses a vertical rooftop flue termination.
Combustion air is supplied from the mechanical room.
See page 15 for detailed information.
Outdoor Installation Venting
This option uses the installation of special air inlet and
vent caps on the unit.
FLUE SIZE
12''
12''
14''
14''
17
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