Bryant 246 User manual

The Bryant Model 246 is a low-pressure, cast-iron sec¬
tional boiler designed for use in water or steam
heating systems. The design is certified by the
American Gas Association for use with natural or
propane gas, The type S boiler can be used in steam
systems with a maximum working pressure of 15 psig.
The type W boiler can be used in water systems with a
normal working pressure of 30 psig and is available
for systems with working pressures of 50 psig or 100
psig when appropriate gauge and relief controls are
used.
All installations are subject to codes established by
local utilities or other authorities having jurisdiction.
This jurisdiction normally covers electrical wiring, gas
piping, flue specification and insulation of adjacent
combustible material where required clearances can¬
not be maintained. As a practical guide, use the
American National Standard Installation of Gas Ap¬
pliances and Piping Z21.30, and Bryant Form No.
39003D1 “Procedure for Gas Appliances”.
Read these instructions completely before beginning
the installation.
Cancels 39246D1 Rev 1 I 39246D9
H 11/15/71
It is recommended that the following step-by-step in¬
structions be followed for best assembly results.
Inspection
Locating the Boiler
Assembling the, Base
Assembling...the. Boiler Sections
Installing the Draft Hood
Manifold and Pilot Header Assembly
Installing Casing Panels
Boiler Header and Piping Installation
Steam and Water Trim' Controls
Gas Controls and Main Gas Connections
- -• -Eflectr i cal-Wiring— . — -.. .
Flue Connection and Venting
Firing Boiler and Control Adjustment
Servicing
Note: The terms “right-hand” and “left-hand”
whenever used in this installation instruction are
determined by facing the side of the boiler with the
manifold.
INSPECTION
The boiler is shipped knocked down. On the end of the
boiler fitting box there is a master copy of all
packages required to assemble the boiler. Each box
has a package number. Check to be sure all required
packages have been received. Also check the rating
plate for type of gas, input, voltage, etc., to be sure
Figure 1 - Model 246 Boiler
that all equipment furnished meets the requirements
of the installation. Any lubricant or pipe dope used ,
for gas valve or gas pipe connections, shall be
resistant to the action of propane.
LOCATING THE BOILER
The boiler should be centrally located with respect to
the distribution system and as close to the chimney as
possible.
This boiler is not intended for use on combustible
.floors,.When selecting the installation site, r emember .
it must have a firm, non combustible level foundation.
Construct a level concrete pad if necessary. If the
boiler base is not level, the sections will not align
properly and assembly difficulties will be encoun¬
tered.
If the Model 246 is to be used as a steam boiler and is
to be connected to another steam boiler, the factory
design waterlines of the two boilers must be equal
distance above floor level.
Combustion Air
APPLIANCES LOCATED IN
UNCONFINED SPACES
In unconfined spaces in buildings of conventional
frame, brick, or stone construction, infiltration nor-

FAX No. 317 240 5662
F. 002/018
mally is adequate to provide air for combustion, ven¬
tilation, and draft hood dilution* *
If the uneonfined space is within a building of
unusually tight construction, air for combustion, ven¬
tilation, and draft hood dilution shall be obtained
from outdoors or from spaces freely communicating
with the outdoors. Under these conditions a per¬
manent opening or openings having a total free area
of not less than one square inch per 5,000 Btuh of
total input rating of all appliances shall be provided.
Ducts used to convey makeup air from the outdoors
shall be of the same cross-sectional area as the free
area of the openings to which they connect Such ducts
connected to the outside air only may be connected, to
the cold air return of the heating system. The
minimum dimension of rectangular air ducts shall be
not less than 3 inches.
All air from inside building:
The confined space shall be provided with two per¬
manent openings, one near the top of the enclosure
and one near the bottom, Each opening shall have a (
free area of not less than one square inch per 1,000 V,-
Btuh of the total input rating of all appliances in the
enclosure, freely communicating with interior areas
having in turn adequate infiltration from the outside.

SEP/04/2008/THU 09:13 AM UTC TECH PUB
FAX No. 317 240 5662
F. 003/018
TABLE || - PERFORMANCE DATA
Boiler Size
Ratings—
Natural & Propane Gas (1)
I Net Ratings (2)
Capacity
allons
Gross
HorRopnwnr Input
Btuh
Gross Output
Steam
Sq Feet
Water
Sq Feet
water
G
Btuh
Steam
Sq Feet
Water
Sq Feet
Btuh Entire
Bailer
To Water
Une
Output (3)
4 315,000 252,000 1,050
1,680
189,000 78B
1,260 27.3 18.8
7,52
5 420,000
336,000 1,400 2,240 252,100 1,050
1,680 33.7 23.2 10.03
. 6 525,000 420,000
, 1,750
2,800 315,100 1,313 2,100 40.1 27.6 12,54 >
r. 630,000
504,000
2,100 3,360 378,100
1,575 2,520 46.5 32.0 15.05
8 735,000 588,000 2,450 3,920
441,100 1,838 i
2,940
52.9
36.4 17,55
.9 B40,000
672,000 2,800 4,480 504,100
2,101 3,360 59.3 40.8 20,06
10
945,000 756,000 3,150
5,040 567,100 2,363
3,780
65.7
45,2^
22.57
11 1,050,000 840,000 3,500 5,600 630,200
2,626 4,200 72.1 49.6 25.07
12 1,155,000 924,000 3,850
6,160 693,200 2,888 .
4,620 !
78.5
54.0. :27.58
13 1,260,000 : 1,008,000 4,200 ' 6,720 756,200
3,151
• 5,040 ;
84.9 58.4 30.09
14 1,365,000
1,092,000 4,550 7,280 819.200 3,413 1 5,460
91.3 62.8 32.60
.15 1,470,000 1,176,000 4,900 7,840 862,200
3,676'
’5,880 1Q4.1
71.6 35.10
17 1,630,000
1,344,000
5,600 8,960 1,015,100 4,230 8,767,
116.9 80.4 40.12
' ■ 19
1,890,000 1,512,000 6,300 - 10,090 1,155,100
4,813 7,700 129.7 89.2 45.13
21
2,100,000 1,680,000'
7,000
11,200
1,295,300 5,397 '
8,635 142!5 ;
98,Q, 50,15
23 2,310,000 1,848,000 7,700 12,320 1,432,600 :
5,369 • 9,550 ■ 155.3 106.8 ;>< : 5 5.16
25 2,520,000 2,016,000
8,400 . 13,440 1,565,200 6,522 i ■ 1 0 ,435 168.1 ;
■ 115.6' .60.18 ,i
:• 27 ; 2,730,000.
2,184,000
* 9,100 14,560 1,695,700
7,065 11,305 180.9 124.4" • 65.19 >.
29 2,940,000 2,352,000
9,800 15,680 1,826,100 7,609 12,175 193.7
133.2 •
70-21
31 3,150,000 2,520,000 10,500 16,600 1,956,500
8,152
13,045 206.5. 142.0 75.22
: 3 3' 1 ■ '
3,360,000 2,636,000 1.1,200
17,920 2,087,000 8,696 13,913 21.9.3 150.8 80.24
( 1 ) All rating for sea level to .2,000 feet- For altitudes over 2,000 feet, reduce all ratings by 4% for each 1,000 feet above sea level,
(2) Selection factors providing for piping and pickup are those recommended by I.B.R
"(3) Ratings hre abased on ,33,500 Btuh per horsepower. ’
Note: Units’may be twinned, back-to-back, to provide units to 6,720,000-Btuh input. .. F;
i
All air from outdoors:
The confined space shall be provided with two per¬
manent openings, one in or near the tqp of the en-
. closure and one in or near the bottom.. The openings
/ . shall communicate, directly, or by means of ducts,--with
/.outdoors or to such Spaces (crawl, or attic), that freely
communicate with, outdoors. n ■
When directly communicating with outdoors, or by
means of vertical ducts, each opening shall have a free
area of not less than 1 sq ill. per 4,000 Btuh of total
—inputT rating-of-alh-appliances^in-the- enclosurer-If^
Horizontal ducts are used, each opening shall have a
free area of not less than,!, sq in. per .2,000 Btuh of
total input of alb appliances in the enclosure.
Ducts shall be of the' same cross-sectional area as the
free area of the openings to which they connect. The
minimum dimension of rectangular air ducts shall be
not less than 3 inches.
Minimum clearance from combustibles is 6 inches on
all sides including the top and draft diverter. Check
local boiler codes to see if this distance conforms to
their requirements. ■
It is recommended that a minimum clearance of 24
inches be maintained in front and on the control end
of the boiler for servicing.
ASSEMBLING THE BASE,
The 4-, 5- and 6-section boilers each have individual
bases. The 4-section base has 6 burners, the 5-sectioh
base has' 8 .burners, and the 6-section b asqdias/10'bur¬
ners.* **.' r . ——
To assemble any boiler larger than 6 sections some
combination of the above three bases must be used.
Follow Table III in order for the gas manifold header
piping to fit, . > ■ ’ '
The bases are fastened together with 5/16-inch cap
Figure 3 - Boiler Boses Size 4, 5, & 6
- 3 -

FAX No. 317 240 5662
F. 004/018
SEP/04/2008/THD 09:13 AM UTC TECH PUB
TABLE III
Boiler Size
No. of Sections
Number
of Bases
Number of Burner3‘ , ‘
Per Base-Left-tO”Rinht
4
1 6
5 1 8
6 1 10
7 2 6-6
. 8
a
6-8
9 2 8-8
10 2 8-10
11
2 10-10
12 3 6-8-8
13 3
8-8-8
.. 14
. 3 6-10-10
■ 15
3 8-10-10
17 4 8-8-3-8
19
4 6-10-10-10
21
4 10-10-10-10
23 5
6-8-10-10-10
25
5 9-10-10-10-10
' ■ • 27
■ 6 '
6-6-10-10-10-10
29
:B
6-10-10-10-10-10
31
6 10-10-10-10-10-10
33
7
6-8-10-10-10-10-10
^Reverse base order if controls are on the left en.d-
• and two in the rear posts as shown in Figure 4. Make
sure the back casing .supports .are mounted on each
' base as shown, in Figure 4.
ASSEMBLING THE BOILER SECTIONS
Steam Risers
Steam risers are not required on small sized boilers.
On boiler sizes 21 through 29, one riser is required, On
boiler sizes 31 and 33, two riser sections are required.
Refer to Figure 6 and Table IV for specific locations.
Figure 6 - Steam Riser Section Location
After the bases are fastened together, install the end
closing plates and the two back corner casing sup¬
ports, See Figure 5. The end closing plate is fastened
to the base by four 5/16-inch cap screws.
CAP SC RE
rf AND 'B,
BACK CASING .SUPPORT
TABLE IV
Boiler
Size
^First/Riser Section V
Location from Left
End. of Boiler
21 '
T' ' : 13th
23 ■ 15th-
25 .?
/ 12th : ■
,'•27 . :14th
23 :
16th
m Ht
13th
10th
*Second Riser Section
Location from Loft
End of Boiler
* Locations must be held; otherwise, the top cover would not Fit
properly.
Start the assembly with a left end battery. A battery
consists of .two sections factory assembled. Make sure
the first battery is lined up even with the left end of
the :baSe. See Figure 7. v ■■■■ . . .
Figure 4 - Rear View of Boiler Bases
. ......... ... . ^
•..fe '
LERF-END-BATFERY-
IN PLACE
Figure 5 - Installing End Closing Plate
Figure 7

SEP/04/2008/THU 09:14 AM IJTC TECH PUB
FAX No. 317 240 5662
P. 005/01 8
Boiler sections should be assembled on the base so
they follow close to the flange on the front of the base
in order that the outer casing will fit properly.
Clean both nipple ports on the left end battery and
coat them, with the red lead furnished. Clean and coat
two nipples with red lead; then tap the nipples into
the ports making sure they are square with the sec¬
tion. See Figure 8.
Figure 8
Set the intermediate battery on the boiler base and
clean and coat the nipple ports; then slide it up to the
first battery. A pair of manual pull-up tools or the
hydraulic assembly tool must be used to pull the bat¬
teries together.
2. Place pull-up guide on bolt and slide into position
next to clamp. This centers clamp in port and causes
it to assume a right-angle position with pull-up bolt.
See Figure 11,
against face of nipple port. Place film of oil on pull-up
bolt before putting nut and washer on.
4. Before tightening nut, jiggle pull-up tool to make
sure both clamp and clamp bar are properly
positioned, V;
5. Work alternately with One pull-up tool and then
other so batteries can be drawn up -uniformly. When
metal-to-metal contact is made around both upper
and lower nipple ports, pull-up is complete. Do not
pull up beyond this point.
6. Remove pull-up tools by removing nut, washer, and
The following instructions are for the manual pull-up
tool only. See Figure.'9. If the hydraulic assembly tool
is used, order installation instruction number
39246D6. " ■ ' ;v : .... A'...' ■ h. > ■■■ •'
wMimm
m&mf
mm
■ ^RDENEI
■ HbI
Figure 9 A6 ^ 27
To use the manual pull-up tools:
1* Insert one pull-up clamp and bolt through front
nipple port of intermediate battery until it is beyond
the nipple of left end battery. Insert second pull-up
tool, in rear nipple port in same manner. See Figure
10. ■■■ '".A ■ .
clamp bar; then with a wire hook, remove guide and
tilt clamp so tool can be removed from nipple port.
Continue to add batteries in the above manner until
the assembly, ds complete, then insert tie rods in the
section lugs matching, the length of the tie rod with
the base. '
On multiple base boilers, insert the tup cover supports
between the lug nuts and washers directly above the
joints in the bases. Fasten the tie rods in place with
the flat washers, lockwashers, and huts furnished. See
Figure 12. • . \
V' • • V •.

FAX No. 317 240 5662
F. 006/018
SEP/04/2008/THD 09:15 AM UTC TECH PUB
Apply boiler putty at the junction of all batteries,
front, back, and top- Putty should also be applied
around the sections where they join the base.
Hydrostatic test the boiler in accordance with ap¬
plicable codes:
a. Plug all openings with exception of an air vent in
top of one end section, such as tapping G in Figure 13.
■ b . Fill boiler with water until it runs out of air vent;
then plug air vent.
c. Check for water leaks before continuing assembly*
Figure 13 - Tappings in End Section for
Steam and Water Controls
A6543Q
Figure 14
Note: Additional flue collar adapters will be shipped
in the fitting package. These adapters, in 9- and 10-
inch sizes, are used to standardize the vent pipe where
more than one flue collar size is used on the same
boiler.
MANIFOLD AND PILOT HEADER ASSEMBLY
When assembling boiler sizes 4, 5, or 6, follow steps 1
and 2 listed below. On boiler .sizes 7 through 33, refer
to the manifold header chart. For the placing of
various lengths of pipe and fittings, follow steps 1
through 7:
•v;:T irgsT ^ LL | N G : THE ; : DRAFT/HOOP^ ; ^^ : "-
The draft diverter comes -completely assembled and
packaged in .individual draft; hood, packages. The
■ d raft diverters are the same size as . the boiler bases.
To assemble the draft hood, see- Figure .14. "
1. Apply boiler putty to top of boiler - section before
mounting draft hood assembly. '•> ,
2. Place draft hood assembly, bn boiler section,
making sure there is enough boiler .putty between
boiler section and draft hood to assure a tight seal on
sides .and ends,.- '. - . ; ,
3. Fasten' draft hood securely with hook bolts,
washers, and nuts furnished.
1 Figure 15
2. Add an elbow and tighten securely so inlet is
parallel to manifold. Install horizontal, nipple G
specified by manifold header chart.
3. On boiler sizes 7 through 33, continue manifold in¬
stallation by installing appropriate horizontal nipple
G as specified in manifold header chart, into first
elbow.
4. Slip specified dresser coupling on nipple. See
Figure 16.
5. Install next vertical nipple-and-tee combination as
indicated in manifold header chart. Tighten tee so
outlet lines up with, previously installed horizontal
- 6 -

SEP/04/2008/THU 09:15 AM UTC TECH PUB
FAX No. 317 240 5662
F. 007/018
nipple and dresser coupling; install specified horizon¬
tal nipple H in outlet side of tee.
6. IMPORTANT 1 - Center slip-on type dresser
coupling over space between two horizontal nipples
and tighten securely. See Figure 17.
7. Repeat above procedure until the manifold assem¬
bly is complete. When completely assembled,
manifold should end with a horizontal nipple exten¬
ding beyond the base.
Figure 16
A6S433
- : Figure 17
Pilot Header Connections , : / ; : . kc
.A':-'/Each boiler base has one pilot. The pilots are assem¬
bled in each base at the factory and are located as
follows: : ;
6 burner base - 3rd burner from right.
8 burner base - 4th burner from right
10 burner base - 6th burner from right
_Onall boilers of two or more bases, the.,pilots.must.b.e„
connected by a tube header consisting of the following
size:
Propane gas - 1/4-inch tube for all sizes.
Natural gas - 1/4-inch tube up to boiler size 23;
3/8-inch tube on boiler sizes 23
through 33.
To assemble pilot header:
1. Install elbow to pilot tube on base opposite control
end.
2. Run pilot tube along manifold header connecting
each pilot to tube with a tee.
3. Continue this procedure to complete pilot header
assembly, then tape pilot tubing to bottom of
manifold header.
NOTE: On natural gas, some'utilities require a pilot
filter. Check with, your local utility.
INSTALLING CASING PANELS
To install tire casing panels: : ::
1. Place top of back casing panels under flange on
draft diverter baffle and bottom of back casing panels
into rear casing supports. See Figure 18.
Figure 18
-2.-Place screws through flange of draft diverter--into
back casing panel.
3. Position end casing panels by placing bottpm rear
corner flange in slot of rear casing support.
4. Place screws into end panel through holes provided
in draft diverter and manifold bracket.
5. Install rating plate (2 pieces) on end panel where
controls will be located.
6. For steam boilers, attach water line plate in fac¬
tory punched holes in panel behind glass gauge on
control end of boiler.
7. Fasten top cover to end of casing panels with two
screws and nuts, furnished. On boiler sizes 7 and
above, a top cover support is supplied and installed on
tie rods as shown in Figure 19.
- 7 -

FAX No. 317 240 5662
F. 008/018
SEP/04/2008/THU 09:16 AM UTC TECH PUB
A65435
Figure 19
. Adjust draft hood dips and top cover supports on tie
rods so top covers line up with end panels and front
covers .are even across top and front Tighten nuts on
tie rods and screws holding top covers to top supports
so top covers are.held firmly in place. ,
'i' ■ - ‘i • ' ™ "i : fY'r i. } ■ &•[/£
BOILER HEADER
AND PIPING INSTALLATION.
Complete the boiler piping (water or steam lines),
paying particular attention to the following recom¬
mendations -for steam boilers., ’: Y vVj' '
1. R eturn must be piped to both ends of boiler.
Boiler Size Dimension A
•4 through 19*
4 inches;-"
2f through 29
• /6 indhes A
31 and 33 'YB- inches
^RELIEF VALVE 15 LBS PS!
2. Minimum steam header proportions should be as
shown in Figure 22,
3, Add skimmer tee as shown in Figure 22,
Note; Never install a shutoff or steam valve between
the pressure relief valve and tire boiler.
On low-pressure boilers, the ASME Code requires
that a pressure relief valve be installed. The valve
discharge capacity in pounds per hour must be at
least equal to the output of the boiler, The capacity of
the boiler in pounds of steam per hour can be deter¬
mined by dividing the boiler output in Btuh by 1000,
For power or process purposes, use the fpllowing for¬
mula;
input
equals pounds of steam per hour
1333
STEAM AND WATER TRIM CONTROLS
Steam Controls
The steam controls for boiler installation consist of
the following components. See Figures 23 and 25.
1. Low-water cutoff (mounted, externally) with blow-
off valve,.
2. High-pressure limit control.
3. Compound jpressurefvacuuro gauge. •
4. Water gauge glass set.
5. Siphon, '
6. 15-psig pressure relief valve.
*The 4, 5, & 6 section 246 may be piped with a
single riser if the croas-fiectional area of the
existing Steam supply .'system is not more than
the single :’4-inch riser area from .the boiler.
IF SIDE OUTLET RELIEF
VALVE IS USED, PIPE TO
WITHIN 6" OF-FLOOR
n!
; .p.
24
' ^
4^
^'SKIMMER
TAPPING
1 INCH
(Uf—
ZJ
BE
RETURN
PIPED TO
DOTH ENDS
OF BOILER ■
SIZED FOR DISTRIBUTION SYSTEM
TO DISTRIBUTION
SYSTEM
!—OPTIONAL
SKIMMER
W LOCATION
ySj 1 INCH
./TOTAL CROSS-
r SECTIONAL
AREA OF
RETURN LINES
SUGGESTED STEAM HEADER PIPING 246 BOILER
EQUALIZER MAY BE INSTALLED
AT EITHER END OF BOILER
AeS317
Figure 22
— S —

SEP/04/2008/THU 09:16 AM UTC TECH PUB
FAX Ho. 317 240 5662
P. 009/018
n w n r- no ^ r-. i-. h-.
J( X X X X V X X X
Si cm Si S' Si
CM CM CM 1^ CM ' r "‘ i— t— 1—
Ohj £
s
x id z: po
<M OQO^
^ (nC^
,^L±J CO =!
OJSi'M i" 2
■ agSgig
x ^3'Z.rJ-ro
(M £0 O (M oO
" l_l_, -J rr\
^ S^'O
* -) Z in
<M qqO dj
e (3
UU 2
w □
</) a i
uj ^
go
a (j
&.&&&% £ £•€I
* * * | * II§ §
CM CM CM CM T— Y“ T— T—
S' Jf S' S' ?t ?t 3t
x x x x x x x x x
S' Si Si 3" S 1 z£
co rt n n r- r- h- <j) r- ai oi a> ai
iSiaaaag«$4*s
X X X X XX X ,X X X X X X
x x x x x x x x x x x x
S' 31 S' S' jm cm cm ^ jm SI 31 31
S -S' Si Si S S' Si ssj £M fM £M £M ;m
m m ri ri ct> oi> co co m co to co co
X n X X XXX XX X.XXX
t* totocotooinioioioiO^iOifl in ho W ifl
9-U- XXXXX XXXX XXXxX XXXX
uj SlSl Si Si ^sm 5£ Si Si 31 Si ;£\( £M ^
g-lU, w> <j> <j> cV^l ct di ■ <$> dl • <d> cO rt cA cO to to to cn
2 X X X X X X X X X X X X X X X X X X,
LU
CO
a. >
a. >
p
5
CM
0
Si
UJ Z
V- 4
SE >
£
H
■ ^
ptl
Ui
_1
Si
(3
UJ Z
U4 p u)
H F
cO cO CO CO.
'V-.Y-'T-
§««*
CM CM CM C^i
X X X X
Si ■
d] C\J oil CM
X X X X
S^SiSi
'£<£‘3 2
CM CM CM CM
CO to CD OO OO CO
XX x X x X
’ CM CM CM CM CM CM
■ XX X X X
,0 SjSJ ,£J4N CJ £i,
UJ Z T 1 ? ^7^7
UJ l Q. T'- CM 1-1-1— -I-
•-E *£ xxxx
1 3 CO
rf* — *.
X LfO LfJ
r—i CD *
Si Si Si Si
CM W Ol W W CM
31 Si M32
X X X X
■ Si si si si
x x x x x
£M £M £M ^ .cj
17 17 17 " 17 cij> cj- c^' rt'
CC0
UJ Z
1 OT _l
« a Z
UJ “j
go
D o
SiSLSiSi
iu 33 Si
o!rf 'T* ^ ^
Cl^* >f “Tt “it 1 *t S' S’ S' to to to xt to it it it it
r= xxxxX X X X x XXXXX X X X X
cc
UJ LU
J N « «5 r- O) r- CO
— — CM CM CM CM to to
o w)
CD
cc
UJ UJ
_J M h-- to CTJ Q 1—
— — 1 — 1 —
o to
CD
CM CM CM CM
- 9 -

FAX No. 317 240 5662
F. 010/018
SEP/04/2008/THU 09:16 AM UTC TECH PUB
G
10 -
NOTE:
To
change
gas
controls
to
left
and
of
bailor,
change
the
lengths
of
the
horizontal
nipples
and
reverse
all
nipple,
between
tees
and
manifold.
NOTE:
All
nipples
connected’
to
dresser
couplings
are
threaded
one
end
only.

F. 011/018
SEP/04/2008/THU 09:17 AM UTC TECH PUB
FAX Ho. 317 240 5662
Water Controls
The water controls for the boiler consist of three com¬
ponents:
1- Water temperature high-limit control (electric).
2, Combination temperature-pressure-altitude gauge.
3, Pressure relief valve (must be piped to suitable
drain).
Install temperature-pressure-altitude gauge in the
tapping indicated in Figure 13. Remove the glass
cover of the gauge and manually set inner pointer to
indicate the vertical height from the gauge to the
highest point in the piping system.
Boiler with Refrigeration System
When the boiler is used in connection with a
refrigeration system, it must be installed so that the
chilled medium is piped in parallel with the heating
boiler, with appropriate valves to prevent the chilled
medium from entering the heating boiler. An example
of such piping is shown in Figure 24.
When the boiler is connected to heating coils located
in air handling units where they may be exposed to
refrigerated air circulation, the boiler piping system
must be equipped with flow Control valves or other
automatic means to prevent gravity circulation of the
boiler water during the cooling cycle.
Note: It is recommended that a relief valve be in¬
stalled between valve A and the boiler or valve B and
the boiler. This relief valve will protect the boiler
from expansion pressures during the cooling season.
COMBINATION PRESSURE/
.VACUUM GAUGE
VALVES A h B — OPEN FOR HEATiNd close r'Gn COOLING
V StlG^PRESSURE
LIMIT.
^ ' LOW-WATER
CUTOFF
Figure 23 - Steam Controls
AB6457
Figure 24 - Refrigerant Diagram
D4 Gas Controls
732 Automatic Pilot:
The pilot assembly includes a normally open switch
wired in series with the Bryant automatic gas control
valve. The switch is at the free end of the monometal
element, assembled so that the fixed end is' positioned
at the pilot flame..Heat applied to the fixed end of the
monometal element causes the free end to move. This
closes the switch and completes the electrical circuit
to the control valve. The circuit will close within one
minute. It will remain closed as long as there is nor¬
mal pilot flame. While closed, the boiler is under the
direct automatic control of the room thermostat or
other operating control as long as the main manual
gas shutoff valve is open. If the pilot flame goes out
for any reason, the monometal element will cool and
the free end will move back to its original position.
This breaks the electric circuit and the. Bryant
automatic, gas control valve will close. This shuts off
tire gas supply to the main burner. ;
Bryant Automatic Gas Control Valve:
The Bryant gas control valve operates on the prin¬
ciple of differential pressure on either. side of a
flexible diaphragm which divides the main body -of
the valve into two compartments. The lower compart
ment is under constant-pressure fromrthe‘'gasisuppJy“
line. Gas pressure to the upper compartment is con¬
trolled by a small valve actuated by. an electric heat
motor.. The control valve allows gas to flow to or from
the upper compartment 'V * /
The electric heat motor is connected into the 24-Volt
control circuit with the room thermostat or other
boiler operating controls. When there is a call for
heat, the control valve closes the supply port to the
upper, compartment and allows the gas above the
diaphragm to bleed off through an escapement to the
pilot
The supply pressure on the bottom then pushes the
diaphragm up and gas flows to the main burners.

FAX No. 317 240 5662
F. 012/018
SEP/04/2008/THU 09:17 AM UTC TECH PUB
CITY WATER
SUPPLY
STE AM BOILERS-SERIES 5
BOILER TAPPINGS ARE AVAILABLE FOR ALL CONNECTIONS SHOWN
CITY WATER
SUPPLY
^—YVA
TO RETURN
n
r
■ t
31 @
ur
—-=i
lUi ©
-|L
n
McDonnell feeder cutoff
COMBINATION
SEPARATE McDONNEL FEEDER AND
SEPARATE McDONNEL LOW-WATER CUTOFF
BOILER SIZE USE •
•4iZ40 . '
Mb, 47-21
THRU • -
, ..Control MnUnlS .in
13-240 ■ G auge - Gfees. Tappings .
17-246 .
NC. 51-2* ...
. THRU
Car'll ml MmM rllA *i^
33-240
1-inch T#ppiiiLj(i
FOR CLOSED HEATING SYSTEMS
DIMENSION -ivi v
BOILER SIZE
USE
4-246
No. 247 Mechanical leader or
THRU
No, K11-24V .Elactrli;: leader
13-246
with transformer— lar use an
closed heating syitaivW only
' 17-246
No. 51-2* ' ’ • ■ "
THRU
. 33 :246 •
. <
MtDONNILl PUMP CONTROL
AND LOW-WATER CUT OFF
USED WITH CONDENSATE RECEIVER
AND IL1CTRIC BOILER FEED PUMP
: NOTE: Far multiple boiler
Installation with condenipl*
tank and tingle boiler feed.,
pump uu No. S3 on each
belter Ip epereta mats riled
valve in *dik boiler feed line.
. FOIL CLOSED HEATING SYSTEMS
PIMSMSION ArZ ='2-1/2 Incftoe
for ‘Process or partial procebs systems
DIMENSION A-1 -1-1/1 InLtnii ' ' •
NOTE: For multiple boiler Imtdllotien ylfth Brevity return,
ute Feeder Gul-off Combination er separate-feeder ond
separate : Cut-off. on each bailer, ■ n.'.; ‘
‘Tbm. ilehii avtilldhlc through Brydnt. '
MCDONNELL S MILLER, INC.
CHICAGO, ill.
ADDI T I ONAL MSDONNELL CONTROLS
' FOR BRYANT MODEL £4«
STEAM BOILERS
BRT, “7
Figure 25
f'Bv
V-
WATER ‘BOILERS - SERIES W
BOILER -TAPPINGS ARE AVAILABLE FOR ALL CONVICTIONS SHOWN
WITH EXCEPTION OF NO 764 WHICH MOUNTS IN PIPING
CITY WATER
SUPPLY
=5=.
BO-
SUPPLY LINE
- 2
C
1 03 % If)
l JU
_
hJ
• • ,
•L
Yi, : N e. 63
r to
“
to
.. ..... : ;J .. :
1 y\t n ..
©=£
T
RETURN
' ■ V r '
' . ; ©=3C
• !: r :
MINIMUM " '
/f/v-vv.
k. ■
’’ f DIMENSION
f
<•' ■ ^ ••'1 -'yy'-P ■ •' ■■■ -.{
V. .L
\* '
* 1 -. 2 v« -
t
*v ••••’ y x * .-• ••• •:
i " ; -‘
-1>i1
□
764
&tH
McDonnell feeder cut off combination
Fgr boilers with
30-psl relief valve -iclting ''
MCDONNELL LOW-WATER CUT OFF
BOILER SIZE ■
- U SE
4-246
THRU
No. 247-2
15-246-
17-246
THRU
Nc. BUT
33-24 8
For boilers with 75 s tp. lOO-psi
' relief valve setting
For allibotlers up to
50-psl relief valve setting
BOILER SIZE
’ ■ - USE
ALL SIZES No. ISO
BOILER SIZE USE
,All sizes/ No. S3’
all Sizes No. 754*
, For boilers with up to
75-pSi relief valve setting**
‘These item* available tbrough Brytml.
BOILER SIZE.
USE
ALL. Sizes-
Nc. 53-2
‘Water Supply prissute must
exceed relief valve setting
by at lent! 20 pei
MCDONNELL S’MILLER, INC.
CHICAGO, ILL.
ADDITIONAL MCDONNELL CONTROLS
FOR BRYANT MODEL 246
WATER BOILERS
1-16-67 BRT,-8
Figure 26
A6545-3
— 12 —

SEP/04/2008/THU 09:17 AM UTC TECH PUB
FAX No. 317 240 5662
F. 013/018
When the operating control or room thermostat is
satisfied, the control valve closes the escapement and
opens the supply port to allow gas pressure to build
up bn top of the diaphragm. When the pressure above
and.below the diaphragm is equal, a spring or weight
reseats the diaphragm and the main gas flow is
shutoff.
Additional force (spring or weight) ie applied to the
upper side of the diaphragm to ensure that no gas will
flow to the burners unless there is sufficient pressure
differential.
Gas Pressure Regulator'
The regulator contains a flexible diaphragm which
operates a valve. With no gas flow, the valve is wide
open. As gas is supplied and the pressure increases,
the diaphragm ie pushed up against the force of a
spring until the gas pressure and spring force are
equal. The valve has now been pulled up, blocking
some of the gas supply, resulting in constant pressure
gas at;'the burner. Any fluctuations will pause the
valve to be repositioned, thus keeping the pressure
constant.
TABLE Vlll-Gas Controls and Main Gas Connections
Control Type >
Gas Type
Boiler Type
D2. ••
Propane
Water
100% Shutoff
. ■ ■
. & .
: 24 Vo ft •
■ " . \ ' : _ i '•
Steam
Thermocouple pilot
' ' . ''' ; D4- ■ 7 ' j Natural
•, Water
/, 24 VpItV/r ' ■ ;
i Bryant 'pi,[ot. ••/.
' ■ . > ' :'/ ■ • V
XT' Steam
■ V • " ■ /. D5. : :
Natural Water
k" -ioo% shutoff // ■ "
•' '
&
■ ; 24 Volt:/,
! ./ Steam
. Thermocouple .pilot
- / '
D6 (4, iS, ■ & :6 size only) '
v:; 1 .Natural'/''; J
Water
' ■ 750 Millivolt ';
\r 'v"‘ '• TV'"- ;
•'Thermbpile: pilot ■
•• ‘V/’ -•
Steam
" _ Control Components _
1. 100% pilot shutoff relay
2. Thermocouple pilot
3. Transformer . ■ ■■ • ■ , ..
4. -Bryant automatic gas valve or controller
1. Bryant automatic pilot
2. Bryant automatic gas valve or controller
3. Gas pressure regulator
4. Transformer ' ■ - ' 1 _
1. 100% pilot shutoff relay
2. Thermocouple ; p ilot
3. Transformer. . , .
4. Bryant automatic gas valve or controller
5. Gas pressure regulator _ ' " ••
1. Thermopile pilot
2. 750-Millivolt automatic gas valve
3. Gas pressure regulator

FAX No. 317 240 5662
F. 014/018
SEP/04/2008/THU 09:18 AM UTC TECH PUB
open, the gas on top of the diaphragm is released. The
gas pressure on the bottom of the diaphragm forces
the diaphragm upward, opening the main valve.
The D6 gas controls are for a 750-millivolt self¬
generating system powered by a pilot burner-
generator only. NEVER connect it to line voltage or
to a transformer.
If the pilot should go out, no electric current would be
generated by the thermopile; therefore, the automatic
gas valve could not open.
Electric Limit Control
This control is furnished with water boilers, all gases.
It will shutoff the gas supply to the main burners
when the water temperature in the boiler reaches the
Cut-Out setting. When the water temperature drops to
the Cut-In temperature, the control allows gas flow to
the burners. Out-Out temperature is adjustable from
180 to 240° F, depending on the limit desired- .....
Gas Piping 1
•Use a ground-joint-type union to connect the control
assembly to the manifold header, then continue the
piping to the main gas supply. Follow all local codes
and ordinances. The following are pertinent recom¬
mendations. See Figure 28.
joint compound (pipe dope) which is resistant to the
action of propane should be applied sparingly and
only to the male threads of the joints. Consult local
supplier for type of compound to be used.
1. Run a spearate gas line direct as possible from gas
source to boiler. Size of pipe should be large as prac¬
tical to minimize pressure loss (consult local utility).
Pipe size should never be smaller .than inlet to main
manual gas shutoff valve supplied with boiler..
2. Mount., mam, manual gas shutoff valve ap¬
proximately 5 .feet above floor level. A tapping for
Figure 28
manu al pilot gas shutoff valve should be on inlet .(sup¬
ply) side of valve. See Figure 27.
• 3. Connect gas control, assembly to main supply line
with ground joint union and tee. • ■
4. Install drip leg from tee so it extends below control
assembly. ... ■ / ■ ".-
5. Support supply pipe with adequate hungers or
straps..•;..: : ■ ". ■■■ '■ :' ■ < • : ? '
Connect the pilot supply tubing from the various
pilots through the 100% pilot shutoff relay, if used, to
the manual pilot gas shutoff valve.
The escapement tube from the Bryant automatic
gas valve, or valve controller, should be installed
oh the pilot burner in the base closest to the control
end of the boiler. The escapement tube is mounted to
the top of the pilot mounting bracket with a clip and
one screw. On boiler sizes 17 through 33, natural gas
only, there are two escapement tubes; one each in the
first two bases from the control end of the boiler. See
Figure 29.
CONDENSATE
SHIELD
CUPS TO HOLD ,.
ESCAPEMENt TUBES
1/4 REGULATOR
BLEED ESCAPEMENT
VALVE ESCAPEMENT TUBE
Figure 29
D4 (Natural) Steam and Water Non-100% Shutoff,
D2 (Propane) D5 (Natural) Steam and Water.
Thermocouple Pilot - 100% Shutoff.
ACS439
14

F. 015/018
SEP/04/2008/THU 09:18 AM UTC TECH PUB
FAX No. 317 240 5662
-rtf •
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, " : -,
-15

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
:'v'-sy-.' if,
.Sf*' • | t
- 1 6 -

SEP/04/2008/THU 09:19 AM UTC TECH PUB
FAX No. 317 240 5662
F. 017/018
gas pressure regulator may be adjusted as follows:
1. To increase input: Turn gas pressure regulator ad¬
justing screw clockwise.
2. To decrease input: Turn adjusting screw counter**
clockwise.
The manifold pressure for natural gas should be 3
inches wc.
NOTE: If measured input varies appreciably from
rated input after the manifold pressure has been set,
it is recommended that the orifices be changed. After
changing the orifices again, check input and manifold
pressure. Propane gas installations have a regulator
installed at the supply tank, This regulator should be
adjusted to give a manifold pressure of 11 inches wc.
Burner Adjustment, Primary Air:
1. Allow b oiler to operate at least 15 minutes after.. in-.
put adjustment. ■ '
2. Adjust each burner flame by closing air shutter ,un-
til a yellow tip appears; slowly open air shutter-until
yellow tip disappears from flame. '
3. Lock shutter in this position with flat locking
screw. ; 1 < ' 1
SERVICING
Flue Connections: 1
Inspect the flue connections to the chinney each year
to make sure it is in good condition and has not
become obstructed.
proper opening and seating of valve, If continually
leaking, never plug - call for service.
CLEANING STEAM BOILERS
Caution: The boiler should not be left .unattended
during the clean-out process, . . .. .^
1. Skimming off Impurities
Some of the impurities in the boiler water will float
on the water and must be skimmed off. Run a tem¬
porary connection from the skimmer tee to ’a suitable
drain. /
With the boiler empty and cool, slowly begin to add
water, After water has entered boiler, never before,
turn “on” main gas burners and adjust flame at main
manual shutoff valve so that the water being added is
kept just below boiling point. Avoid boiling and tur¬
bulence, -
Gradually raise hot water level to tee, being careful
not to raise it above the opening in the tee. Skim until
there is no trace of impurities. Repeat process if
necessary,
Water may be checked to make sure it is free from oil
by drawing off a sample at the skimming tee, If the
sample is reasonably free from oil, it will not froth
when boiled on a stove. This test does not indicate the *
amount of sediment which may lay in the bottom of
the boiler. It is therefore necessary that the boiler be
further cleaned by “blowing down”.
Draining Boilers:
Boilers should never be drained unless absolutely
necessary. The water should remain in the boiler bet¬
ween heating seasons. When it is necessary to add
makeup water, trapped air should be removed
through the system vents. It has been found desirable
under some conditions to keep the pilots lighted
during the summer months to reduce surface \
corrosion.,,:,;........-....-- i
2. “Blowing Down” Boiler
Before “blowing down” the boiler, fill it to the water
line. Light burners and allow 5 pounds of steam
pressure to build up. Run a temporary connection
from one of the drain valves to a nearby sewer. Con¬
nect to a drain valve on the opposite end of the-boiler
from the feed water inlet, if possible. Shut;, off the 1
gas burners and inlet, water, open drain valve, and
“blow down”-entire contents of boiler, ■ .-.-
Frequent addition of water can shorten the life of the
boiler. If it is necessary to add water frequently, check
the entire system and repair all leaks. If it is still
necessary to add makeup water frequently, be sure the
air is removed- The boiler water should be mildly
alkaline with a pH of 7 to 8. Consult a local water
^’treatment company - for. their ’recommendations’
Impurities in Boiler Water:
When a boiler is first installed and used for a few
days; oil, grease, and sediment from pipe fittings may
collect within the boiler.. These impurities may cause
foaming and an unsteady water 1 line. They may
prevent steam generation in a steam boiler and may
result in objectionable odors escaping from the vents
on water boilers. This condition can be remedied only
by giving the boiler a thorough cleaning.
CAUTION: Check the boiler water level; Never risk
lighting the pilots or main burners under a dry boiler.
Allow boiler to "thoroughly cool and slowly refill to
water line. Repeat Step 2 as many times as required
until “blow-off” water is clear. 4- . ..
Using Cleaning Compound .. ,
If an exceptional amount of dirt or sludge seems to be
present-in-the boilery-a—boiler— cleaning--compound-
made by a reputable manufacturer may be used ac¬
cording to the instructions of the manufacturer -of the
compound. When ,any .type of cleaning .compound is
used, care must be taken to thoroughly flush all traces
of the compound out of the boiler. ■ ' v
Sal Soda (washing soda) is sometimes used for excep¬
tionally dirty boilers, but its use requires extrettie cau¬
tion. The boiler can be seriously harmed if the soda is
not thoroughly washed out so that the water does not
exceed a pH value of 7 to 8. Soda is difficult to remove
and requires a lengthy process of repeatedly flushing
the boiler to assure complete removal.
Relief Valve Care and Maintenance ; -. d If soda is insisted upon, it is recommended that a
Manually trip felief valve once‘ a month to assure solution of one pound, dissolved in a pail of hot water,
- 17 -

SEP/04/2008/THU 09:19 AM UTC TECH PUB
FAX Ho. 317 240 5662
P. 018/018
be prepared for each 10 gallons of boiler water.
(Check water capacity of boiler). Pour the solution in
any convenient opening at, or above, the flow tapping.
Fill boiler to flow tapping and adjust fire manually to
maintain simmering for 6 or 6 hours. Increase fire to
build up 5-pounds pressure and "blow down” boiler.
“Blow down” boiler again as in Step 2, then flush con¬
tinuously until it is .certain that boiler is free of the
soda. After the boiler has been thoroughly cleaned,
add fresh, clear water to the proper level in the heat¬
ing system. The degree of acidity or alkaline should
not exceed a pH value of 7 to 8. "
RELAYS OR R t LOTS
IF SINGLE U(YIT
STREAM PRESS./
WATER TEMP.
—, HI-LIMIT
IS ROOM -
THERMOSTAT
(ANTICIPATOR .SETTING 0.4)'
POWER
SUPPLY
=E TRANSFORMER
W
Z4V REQUIRED
^ ON STEAM
BOILERS ONLY
BRYANT
GAS VALVE OR
CONTROLLER
Figure 34 - D4 (Natural) Steam and Water Non-100%
Shutoff. - D2 (Propane) and D5 (Natural) Steam and
Water-100% Shutoff.
MANUAL SWITCH
HOT
OPERATING iC'CnTROL' /'
■ '.MAKES 1 '. ION ,TEMP-RISE-
PILOTS OR PILOT. RELAYS
HIGH
: LIMIT
' e e
_J GPO UNO
TRANSFORMER
H-*R 182 A
RELAY
BRYANT VALVE
OR
CONTROLLER
S'Ll.-'
I,,;. ■ .*.•./• ■ yV • *6 -n v .-j ■
t THERMOSTAT . ..
‘ WoTOR' : ...
V.IV-,. • > -1 ,'V. . ' ■ , (ANTICIPATOR
a. Ain, . . ■ w^a \ SETTM 504 )
■ . ’V ■ • .'.• ■ •rtf vv>y
FORCED WATER CIRCULATION FOR 246 BOILER
, CONTROL SHOULD BE LOCATED IN TAPPING “G” (SEE PAGE 6) END SECTION OPPOSITE FROM LIMIT CONTROL AND THE
TEMP-ALT-GAUGE INSTALLED IN THE TOP '/£” TAPPING.
CLEANING THE BOILER
The flue, passages between sections should l be ex- THE pilot LE . ___
arnined yearly and cleaned as required. j—1 ~~1
. , j'i . . i ,.„ v; , ...... p p t h. I.., ...
1 . Turn off electrical power supply and gas supply to IT Ti 9 °~° required
boiler. “ ' — jLJ sas
2 . Remove front casing panel(s). --r-rj
n ' HI- TEMPERATURE ^THERMOSTAT
2 . Remove burner doors and burners. water limit suitable for w
4 . Remove top cover from draft hood(s). * f ) circuit
6. Clean flue passages between sections with a wire ^ 7
flue brush. —/ u-—’ I ■■ ■ - ■ > - a6 S4S9
6 . Qlean out the bottom of boiler. , Figure 36 - D-6 Controls 4, 5, & 6 sizes only
7, -Reassemble boiler by reversing above steps. (Millivolt, Thermopile pilot, — Nat, gas)
P P T H
o 0-0 o
gas valve
REQUIRED
ON’STEAM
- BOILERS
ONLY
HI - TEMPERATURE
WATER LIMIT
-THERMOSTAT
SUITABLE FOR
millivolt
circuit
Figure 36 - D-6 Controls 4, 5, & 6 sizes only
(Millivolt, Thermopile pilot,—Nat, gas)
- 18