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insTallaTion
DIRECT EXHAUST - Room Air Openings (Cat. II and IV)
1
Combustion Air Provision
NOTICE
A bird screen must be added to the inlet adapter to
prevent large debris from entering the boiler cabinet.
2
The SVF commercial boiler can use inside air if
no contaminants are present in the boiler space
If contaminants are likely to be present, install the
boiler as a direct vent appliance Use the appropriate
vent instructions in this manual
The boiler room must be fitted with combustion
3
air openings large enough to provide air for all
appliances in the room Use the following information
to size the openings Ensure the installation complies
with all applicable codes and standards
Sizing Combustion Air Openings
4
Air openings provide ventilation to prevent
overheating of the boiler controls and boiler space
Air is also needed for other appliances located in
the same space Use the information in Figure 25,
page 39 for air openings
5
WARNING
!
Air openings must be sized to handle all
appliances and air movers, such as exhaust fans,
using the air supply. Failure to comply can result
in severe personal injury, death, or substantial
property damage.
6
The sizing given in Figure 25, page 39 is based
on the National Fuel Gas Code – ANSI Z223 1/
NFPA 54, latest edition The sizing allows adequate
air openings for gravity-vented gas appliances
(Category I), in addition to the needs for the SVF
boiler, provided the boiler room is not subjected
7
to negative pressure due to exhaust fans or other
mechanical ventilation devices
The SVF commercial boiler is rated Category
IV and has varying requirements for combustion
and ventilation air, reflected by the special sizing
instructions given in this manual Refer to the National
8
Fuel Gas Code for dealing with other conditions
38
svf
series
725/850
Free area and louvers
The free area of openings means the area after
reduction for any installed louvers or grilles Be sure to
consider this reduction when sizing the air opening
Special Considerations
Tight construction: The National Fuel Gas Code
– ANSI Z223.1/NFPA 54, latest edition, defines
unusually tight construction where all of the following
is true:
1
Walls and ceilings exposed to the outside
atmosphere have a continuous water vapor
retarder with a rating of 1 perm or less with
openings fitted with gaskets.
2
Weather-stripping has been added on windows
and doors that are capable of being opened
3
Caulking or sealants are applied to areas such as
joints around windows and door frames, between
sole plates and floors, between wall-ceiling
joints, between wall panels, at penetrations for
plumbing, electrical, and gas lines, and in other
openings
For buildings with such construction, provide air
openings into the building from outside Size the
openings per the appropriate condition in Figure 25,
page 39 if appliances are to use inside air for
combustion and ventilation
Exhaust fans and movers: The appliance space
must never be under a negative pressure unless
all appliances are installed as direct vent Always
provide air openings sized to the dimensions required
for the firing rate of all appliances, with the ability to
handle the air movement rate of the exhaust fans or
air movers using air from the building or space
The damper/louver control can also provide 120V
to operate a damper, and can provide input for a
closure switch to allow the damper to prove it is in the
open position
boiler manual
1
550-100-290/0124
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