Bryant 246 - ELECTRICAL WIRING; FLUE CONNECTION AND VENTING

F. 015/018
SEP/04/2008/THU 09:18 AM UTC TECH PUB
FAX No. 317 240 5662
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On boilers with regulators larger than 1 inch, a 1/4-
inch regulator escapement tube is required. This tube
is also installed on the pilot mounting bracket in the
base nearest the control end of the boiler. It is
mounted with a clip in the same location ffs the dia¬
phragm valve escapement tube.
A stainless shield is fastened under the escapement
tube clamps and is folded over the top of the
escapement tubes to prevent condensate from,
plugging the escapement orifices. The metal shield is
shown in Figure 29.
IMPORTANT: After all connections have been made,
check for leakage with a soap-and-water solution or
in accordance with regulations of local, utilities.
CAUTION: Never use a match or other open flame to
check for gas leaks,
After all gas connections have, been made and checked
for leaks, the supply lines must be purged to eliminate
trapped air. ’ . ' r . ' . \ i ;
It is recommended that the pilot supply tube be
disconnected at the pilot, shutoff valve on the boiler
and the supply line allowed to purge until the odor of
gas is detected. Immediately upon detecting a gas
odor, shut off gas supply, reconnect the pilot sup¬
ply-tube, Wait ’5 minutes, then proceed to light pilot
as instructed on the rating plate.
ELECTRICAL WIRING
All. electrical wiring should be in accordance with the
National Electric Code and any local or gas company
requirements which may apply.
All external wiring must be protected in accordance
with local and national codes.
The wiring from the high-temperature limit must be
fastened to the clips in the end panels. All wiring to
the pilots and .pilot relay must be taped securely
the side of manifold opposite the batteries . The wire
furnished is a low-energy wire.
An NEC class 2 transformer supplied must be used in
the control firing of the Model 246 Boiler, except D6
millivolt natural gas controls. See wiring ‘diagrams,
Figures 34, 35, and 36.
If any of the original wire as supplied with the unit
must be replaced, use type 105 °C thermo-plastic wire
or its equivalent. • . .r.- r/
FLUE CONNECTION AND VENTING
Consult..local codes and gas company requirements.
The following is standard practice for installing the
flue pipe:
1. Consult dimensional drawing for number and size
of flue pipes required for each size boiler. Abo, con¬
sult appropriate table in A.G.A. Standards book for
size of chimney . connection.
2. Maintain minimum upward slope of 1/4 inch per
linear foot from the boiler to chimney.
3. Run flue pipe directly as possible. Keep turns to a
minimum. Insert flue pipe into, but not beyond, inside
wall of chimney.
4. Do not connect into a chimney serving an open
fireplace.
6. Insulate flue pipe where it passes hear combustible
material, 1 - ■ • '
6. Rigidly support pipe with hangers and straps.
7. Chimneys should extend at least 2 feet above any
object within radius of 15 feet. This includes roof.
5. All flue pipes which extend through roof should be
equipped with a hood.
In almost all locations, venting of a boiler reties on
natural draft. Inasmuch as the energy available from
natural draft is quite low, serious thought should be
given to vent system design, i,e., adequate size, use of
gradual transitions, tee's, elbows, etc., close proximity
of boiler and chimney. On all boilers, the vertical
risers must be at least as large as the vent openings bn
the draft hood.
A simple vent system consists of a 6 foot minimum
vertical rise immediately off the draft hood,-as Shown
in Figure 30. This vertical flue should terminate
above the building roof with a suitable rain cap at
least 2 feet above surrounding obstructions, he,,
parapets, adjacent buildings, penthouses, etc. This
vent system applies to single draft hood boilers
ONLY. It has limited practical use because of its
restriction to single story boiler rooms and problems
encountered in roof flashing.
— —— -- ~ pi g u re^3 g ——:——
The above vertical Venting system could not be used
on multiple-base boilers because of the physical inter¬
ference of multiple rain caps.
For multiple-base boilers, Figure 31,. the pant leg yen-
ting system shown could be applied if desired, " : -,
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