A.O. Smith 104 Series, Инструкция по эксплуатации

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16
DIRECT VENT APPLIANCES
Applian F es installed in a Dire F t Vent F on ¿ guration that derive all
air for F ombustion from the outdoor atmosphere through sealed
intake air piping are not fa F tored in the total applian F e input Btu/
hr F al F ulations used to determine the size of openings providing
fresh air into F on ¿ ned spa F es
EXHAUST FANS
Where exhaust fans are installed, additional air shall be provided
to repla F e the exhausted air When an exhaust fan is installed
in the same spa F e with a water heater, suf ¿F ient openings to
provide fresh air must be provided that a FF ommodate the
requirements for all applian F es in the room and the exhaust fan
Undersized openings will F ause air to be drawn into the room
through the water heater ¶ s vent system F ausing poor F ombustion
Sooting, serious damage to the water heater and the risk of ¿ re
or explosion may result It F an also F reate a risk of asphyxiation
LOUVERS AND GRILLES
The free areas of the fresh air openings in the instru F tions that
follow do not take in to a FF ount the presen F e of louvers, grilles or
s F reens in the openings
The required size of openings for F ombustion, ventilation and
dilution air shall be based on the ³ net free area ´ of ea F h opening
Where the free area through a design of louver or grille or s F reen
is known, it shall be used in F al F ulating the size of opening
required to provide the free area spe F i ¿ ed Where the louver and
grille design and free area are not known, it shall be assumed
that wood louvers will have 25 free area and metal louvers and
grilles will have 75 free area Non motorized louvers and grilles
shall be ¿ xed in the open position
UNCONFINED SPACE
An Un F on ¿ ned Spa F e is one whose volume IS NOT LESS THAN
50 F ubi F feet per 1,000 Btu/hr (4 8 F ubi F meters per kW) of the
total input rating of all applian F es installed in the spa F e Rooms
F ommuni F ating dire F tly with the spa F e, in whi F h the applian F es
are installed, through openings not furnished with doors, are
F onsidered a part of the un F on ¿ ned spa F e
Makeup air requirements for the operation of exhaust fans,
kit F hen ventilation systems, F lothes dryers and ¿ repla F es shall
also be F onsidered in determining the adequa F y of a spa F e to
provide F ombustion, ventilation and dilution air
UNUSUALLY TIGHT CONSTRUCTION
In un F on ¿ ned spa F es in buildings, in ¿ ltration may be adequate
to provide air for F ombustion, ventilation and dilution of À ue
gases However, in buildings of unusually tight F onstru F tion (for
example, weather stripping, heavily insulated, F aulked, vapor
barrier, et F ) additional air must be provided using the methods
des F ribed in the Con ¿ ned Spa F e se F tion that follows
CONFINED SPACE
A Con ¿ ned Spa F e is one whose volume is less than 50 F ubi F
feet per 1,000 Btu/hr (4 8 F ubi F meters per kW) of the total input
rating of all applian F es installed in the spa F e
Openings must be installed to provide fresh air for F ombustion,
ventilation and dilution in F on ¿ ned spa F es The required size for
the openings is dependent on the method used to provide fresh
air to the F on ¿ ned spa F e and the total Btu/hr input rating of all
applian F es installed in the spa F e
VENTING INSTALLATION
VENTING
THE INSTRUCTIONS IN THIS SECTION ON VENTING MUST
BE FOLLOWED TO AVOID CHOKED COMBUSTION OR
RECIRCULATION OF FLUE GASES SUCH CONDITIONS
CAUSE SOOTING OR RISKS OF FIRE AND ASPHY ; IATION
Heater must be prote F ted from freezing downdrafts
Remove all soot or other obstru F tions from the F himney that will
retard a free draft
Type B venting is re F ommended with these heaters
This water heater must be vented in F omplian F e with all lo F al
F odes, the F urrent revision of the National Fuel Gas Code
(ANSI-Z223 1) and with the Category I Venting Tables
If any part of the vent system is exposed to ambient temperatures
below 40
ƒ F (4 4 ƒ C) it must be insulated to prevent F ondensation
‡ Do not F onne F t the heater to a F ommon vent or F himney with
solid fuel burning equipment This pra F ti F e is prohibited by
many lo F al building F odes as is the pra F ti F e of venting gas
¿ red equipment to the du F t work of ventilation systems
‡ Where a separate vent F onne F tion is not available and the vent
pipe from the heater must be F onne F ted to a F ommon vent with
an oil burning furna F e, the vent pipe should enter the smaller
F ommon vent or F himney at a point above the large vent pipe
BAROMETRIC DRAFT CONTROL ASSEMBLY
A double-a F ting barometri F draft F ontrol assembly is provided
with ea F h unit The draft F ontrol assembly must be installed
without alteration This assembly is fa F tory adjusted for horizontal
appli F ation only and must be atta F hed to the heater as shown in
Figure 11 The outlet of the draft F ontrol assembly may be rotated
to fa F e in dire F tion needed The assembly must be ¿ tted to the
ja F ket F over su F h that it is plumb and level to the ground Fasten
the draft F ontrol assembly to the top F over using sheet metal
s F rews at three lo F ations, or more, as required
Dampers or other obstru F tions must not be installed between the
heater and the barometri F draft F ontrol assembly
Do not adjust settings on gate Counterweight washers are fa F tory
adjusted and should result in bree F hing pressure measurements
at the F ombustion test hole (Figure 11) within the range shown
in Table 10
NOTE: A negative draft must be maintained in the vent piping
When installed, the damper gate must pivot freely in the ring
guides This gate will automati F ally adjust to regulate the F himney
draft imposed on the heater
PROPER DRAFT CONTROLLER AND
VENT PIPE INSTALLATION
FIGURE 11.