Bryant 246 - FIRING BOILER AND CONTROL ADJUSTMENT; Lighting D4 and D6 Pilots; Lighting D2 and D5 D5 Pilots

SEP/04/2008/THU 09:18 AM UTC TECH PUB
More generally used id a vent system. as shown in
Figure 32. Using the draft hood vent opening sizes
shown in the boiler installation instructions, this
system will work properly if a minimum vertical rise
of 4 feet above the draft hood can be maintained.
This is assuming that the chimney is of adequate size
and also that adequate -combustion air is available.
Further, the outlet end of the horizontal collector
should be no more than 6 feet from the chimney and
should have no more than one 90° elbow in this six-
foot fun.
i
Practical application in many cases, however, will not
allow adequate rise 4 feet above the boiler draft
hood, and this is the installation Where trouble oc¬
casionally develops^ As this minimum of 4 feet is
reduced, the. ability of these risers to create a. natural
: ■ ,v draft is reduced. This initial energy source is quite im-
S": .{portaht, When it is not available, certain steps can be
■ Lyf taken to provide proper venting. For each foot of riser
; reduction, enlarge the horizontal collector, diameter
one-inch, This will reduce the resistance of the system,
and if the chimney is . adequate;. the. unit should
--properly vent. :y •/ . f.F •' }
|. ' : l " In certain cases where short risers, less than. 4 feet
! ' v >vy- ; high are a necessity due'to/overhead obstructions,
spillage of combustion products has beep noted at the
i \v- di'aft hoods farthest^hmim the"chimneyrOnce^ag-a'inr
pT'T ; assuming the chimney ia adequate, an acceptable
i m ethod of correction is to .permanently baffle the
ly-'" ■■■■ riser(s) closest to the chimney to reduce the excess of
Iv-ir room air entering those draft hoods, DO NOT BAF-
FLE ENOUGH TO CAUSE SPILLAGE. The fixed
baffles in the short risers above the boiler draft hood
are acceptable as spelled out in Gas Appliances Gas
Piping Z 21.30. Size of Vent Connectors, and .Dampers.
These baffles can he fabricated from 20-gauge steel
such as shown in Figure 33. They should he per¬
manently attached to the inside of the riser(s). Trial
and error will dictate the degree to which each should
be positioned to avoid draft hood spillage at the far
end of the boiler. Be sure not to bend the fixed baffle
FAX No. 317 240 5662
P. 016/018
so it will obstruct the flue gas flow in the horizontal
collector. ^
ENLARGE
Baffle Size (Inches)
A55443
R ; CO 9
10 '
A ''
6 7 ■
8
Shown is suggested ewe of
fixed baffle for different
size -rioers..
A", .... -Figure 33 ,. f " ,
FIRING BOILER AND
i CONTROL ADJUSTMENT
After completing all gas and flue connections and
water piping, the boiler is ready for operation;and ad¬
justments. ••. . . . : ■ ■ / ■ 7* ■■ "M
Before Lighting.(all gases)'
1. Make certain that boiler is -properly filled with
water. -: ".'-'l;; . LyS'L- ■
2- Open all valves in supply and return mains of heat¬
ing System, - ■ ' : : ■■
3. Set thermostat, or operating control below normal
setting. • ■
4, Close main manual gas shutoff-valve and manual
pilot gas Shutoff valve for 5 minutes before lighting
pilots,
Lighting D4/and DC Pilots:
1, Open manual pilot gas shutoff valve and allow
time for. air to .purge from line,
2, Light pilot(s) with a match or taper soon as air is
purged 2 7 1 ! L. : ' •< J r i,
Lighting D2 and D5 Pilots;.
1. Open manual pilot gas shutoff, valve, . ....
,2. Depress red button on. .1.00% pilot shutoff valve and
allow time for air to purge.
3, Light all pilots soon as air is purged,
_4. Keep red, b utton depressed until nilot flame is
stable, r... ... . .;• . i'j.r ■
f Gas Pressure Regulator
The adjustable, spring-loaded gas regulator ensures a
constant gas pressure to the burners during main line
gas pressure fluctuations. It is adjusted at the factory
to deliver an outlet pressure of approximately 3
inches wc, assuming a range of inlet pressures up to
15 inches wc- While-.the boiler is -in operation, check
the gas input at the meter. The burners are equipped
with fixed orifices sized to produce the rated input
shown on the rating plate. Determine the gas input by
following the method in Bryant form “Installation
Procedures for Gas Appliances.”
If the measured and rated input are not the same, the
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