MODEL CB OHIO SPECIAL
100-225 HP Steam
CONTENTS
FEATURES AND BENEFITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Unique Dimple Tube Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
358 Square Feet of Heating Surface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Low Furnace Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
PRODUCT OFFERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
DIMENSIONS AND RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
PERFORMANCE DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
ENGINEERING DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Boiler Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Burner Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Boiler Room Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Stack/Breeching Size Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
SAMPLE SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
1
1/11
Model CB-OS
100-225 HP
ILLUSTRATIONS
Figure 1. Model CB Ohio Special Steam Boiler Dimensions - Sheet 1 of 2 . . . . . . . . . . . . . . . . . .
Figure 2. Space Required to Open Rear Head on Model CB Ohio Special Boilers
Equipped with Davits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3. Model CB Ohio Special Boilers Lifting Lug Location . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4. Model CB Ohio Special Boiler Mounting Piers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5. Complete Linkage Assembly, Combination Gas and Oil . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6. Gas Modulating Cam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 7. Model CB Ohio Special Gas Train Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 8. Typical Gas Piping Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 9. Model CB Ohio Special Firetube Boilers Standard Gas
Train Connection Size and Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 10. CB a Ohio Special Boilers, No. 2 Oil Connection Size,
Location and Recommended Line Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 11. No. 2 Oil Piping, Single Boiler Installation, Remote Oil Pump . . . . . . . . . . . . . . . . . . .
Figure 12. No. 2 Oil Piping, Multiple Boiler Installation, Remote Oil Pumps . . . . . . . . . . . . . . . . .
Figure 13. No. 2 Oil Piping, Multiple Boiler Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 14. Boiler Room Length (Typical Layouts), Model CB Ohio Special . . . . . . . . . . . . . . . . . .
Figure 15. Boiler Room Width (Typical Layout), Model CB Ohio Special . . . . . . . . . . . . . . . . . . .
Table
Table
Table
Table
Table
Table
Table
Table
Table
Table
TABLES
1. Model CB Ohio Special Steam Boiler Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Model CB Ohio Special Boilers Heating Surface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. Model CB Ohio Special Boilers Steam Volume and Disengaging Area . . . . . . . . . . . . . . .
4. Model CB Ohio Special Boilers Steam Boiler Safety Valve Openings . . . . . . . . . . . . . . . .
5. Model CB Ohio Special Firetube Boilers Recommended Steam Nozzle Size
(To Maintain 4000 to 5000 fpm Nozzle Velocity) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6. Model CB Ohio Special Firetube Boilers Recommended Non-Return Valve Size . . . . . . . .
7. Blowdown Tank Sizing Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8. CB Ohio Special Firetube Boilers Minimum Required Gas Pressure
at Entrance to Gas Train . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9. Minimum Required Gas Pressure Altitude Conversion . . . . . . . . . . . . . . . . . . . . . . . . . .
10. Maximum Gas Consumption, Natural Gas and Propane Gas . . . . . . . . . . . . . . . . . . . .
2
1/11
7
9
9
10
13
14
18
19
20
20
21
21
22
23
23
6
10
11
11
11
12
12
14
16
16
100-225 HP
Model CB-OS
FEATURES AND BENEFITS
The Cleaver-Brooks Ohio Special Firetube boiler is designed, manufactured, and
packaged by Cleaver-Brooks specifically for operation in the state of Ohio, under the
rules and regulations for unattended units. The unique design of the Ohio Special
Boiler serves your steam needs and reduces unnecessary labor costs. All units are
factory fire tested and shipped as a package, ready for quick connection to utilities.
In addition to the features provided on all Cleaver-Brooks Firetube boilers, the
following features apply to the Ohio Specials.
Unique Dimple Tube Design:
• Ensures high gas turbulence and increased efficiency without turbulators,
spinners, and other high maintenance devices.
•
Dimple tubes also reduce the film coefficient on the gas side to transfer more
heat, thus achieving greater output with less heating surface.
358 Square Feet of Heating Surface:
• The greatest amount offered in any packaged boiler for unattended steam boiler
operation in Ohio - means long life and years of service at the high efficiencies.
Low Furnace Location:
• Furnace located well below water level with generous clearance from bottom of
boiler, allowing proper circulation.
•
Low furnace provides additional safety margin between furnace and water level.
•
Reduces water carryover, producing drier steam.
PRODUCT OFFERING
Cleaver-Brooks Ohio Special Firetube boilers are available high pressure steam
designs. Burners are available to fire natural gas, light oil, or a combination of oil
and gas.
Ohio Special Boilers include:
•
Four-pass dryback design (100 hp).
•
Two-pass dryback design (125 - 225 hp).
•
15 psig low pressure steam.
•
150, 200, and 250 psig high pressure steam
•
Natural gas or light oil firing.
Available options: For option details, contact your local Cleaver-Brooks authorized
representative. In summary, options include the following:
Boiler Options
•
Drain valves.
•
Additional screwed or flanged trappings.
•
Surge load baffles.
•
Seismic design.
•
Blowdown valves.
•
Non-return valves.
3
1/11
Model CB-OS
100-225 HP
•
Feedwater valves and regulators.
•
Special doors, davited, hinged, left swing.
•
Special base rails.
•
Surface blowdown systems.
•
Weather-proofing.
Burner/Control Options
Special modulation controls.
Optional flame safeguard controller.
Lead/lag system.
Special insurance and code requirements (e.g., IRI, FM, CSD1).
Remote contacts.
Additional relay points and indicator lights.
Main disconnect.
Elapsed time meter.
Voltmeter/micro-ampmeter.
NEMA enclosures.
Low fired hold controls.
Remote emergency shut-off (115V).
Circuit breaker.
Day/night controls.
Special power requirements.
Fuel Options
•
Automatic fuel changeover.
•
Oversized/undersized gas trains.
•
Gas strainer.
•
Special fuel shut-off valves.
•
Special pilot.
•
Alternate fuel firing.
•
Special oil pumps.
DIMENSIONS AND RATINGS
For dimension and rating information for Ohio Special boilers, refer to the following
tables and illustrations:
•
Table A8-1. Model CB Ohio Special Steam Boiler Ratings.
•
Figure A8-1. Model CB Ohio Special Steam Boiler Dimensions.
•
Figure A8-2. Space Required to Open Rear Head on Model CB Ohio Special
Boilers Equipped with Davits.
•
Figure A8-3. Lifting Lug Locations, Model CB Ohio Special Boilers.
4
1/11
100-225 HP
Model CB-OS
•
Figure A8-4. Model CB Ohio Special Boiler Mounting Piers.
PERFORMANCE DATA
For efficiency and emission data for Ohio Special Boilers, contact your local CleaverBrooks authorized representative.
5
1/11
Model CB-OS
100-225 HP
Table 1. Model CB Ohio Special Steam Boiler Ratings
BOILER HP
100S
125S
150S
WEIGHT IN POUNDS
Normal Water Capacity
4625
7000
7000
Approx Wt -15 psig
7800
9300
9300
Approx Wt -150 psig
8500
9900
9900
Approx Wt - 200 psig
9000
10500
10500
Water Capacity Flooded
5420
8673
8673
RATINGS SEA LEVEL TO 3000 FT
Steam - lbs/hr (212°F)
3450
4313
5175
Btu Output (1000 Btu/hr)
3348
4184
5021
APPROXIMATE FUEL CONSUMPTION AT RATED CAPACITIES
Light Oil gph
29.9
37.4
44.8
(140,000 Btu/gal)
Nat Gas CFH
4184
5230
6277
(1000 Btu/cu-ft)
Nat Gas -Therms/hr
41.8
52.3
62.8
POWER REQUIREMENTS - ELECTRIC (60 Hz)
Blower Motor, hp (all models) 3
5
7-1/2
Oil Pump Motor, hp (No. 2 Oil) 1/3
1/2
1/2
Air Compressor Motor hp
2
3
3
(Oil Fired Only)
NOTES:
1. Standard Voltage is 230 or 460/3/60 Hz.
2. Burner control circuit Voltage is 115/1/60 Hz,1/2 kVA load.
3. Side mounted air compressor (3 hp motor) recommended for 200S and 225S.
6
1/11
175S
200S
225S
8500
12600
13500
14200
10485
8500
12600
13500
14200
10485
8500
12600
13500
14200
10485
6038
5858
6900
6695
7763
7532
52.3
59.8
67.2
7323
8369
9415
73.2
83.7
94.1
10
1/2
3
15
1/2
3
20
1/2
3
100-225 HP
Model CB-OS
RR/RF/RD
EE
FF
B
F
I
LL
L
DD
BB
GG
K
D
T
CC
Y
E
P
O
H
S
ELECTRICAL
SERVICE
CONNECTIONS
(CONTROL CIRCUIT
120/1/60)
Z
J
KK
Q
R
.5"
N
W
W
C
M
A
MODEL HP
DIM
100S
125S
150S
175S
200S
225S
LENGTH
Overall
A
171-1/2
159-1/2
160-1/2
197-1/2
197-1/2
199-1/2
Shell
B
131
113
113
149
149
149
Base Frame
C
130
100
100
136
136
136
Front Head Extension (Approx) D
22
27
28
29
29
31
Rear Head Extension
E
18-1/2
19-1/2
19-1/2
19-1/2
19-1/2
19-1/2
Flange to Nozzle (15 psig)
F
65-1/2
58
58
90
92
92
Flange to Nozzle (150 psig)
F
72.5
58
58
88
88
88
Figure 1. Model CB Ohio Special Steam Boiler Dimensions - Sheet 1 of 2
7
1/11
Model CB-OS
100-225 HP
MODEL HP
DIM
100S
125S
150S
175S
200S
225S
WIDTH
Overall
I
73
85
85
85
85
85
ID Boiler
J
48
60
60
60
60
60
Center to Water Column
K
39
45
45
45
45
45
Center to Outside Hinge
KK
29
35
35
35
35
35
Center to Lagging
L
27
33
33
33
33
33
Center to Auxiliary LWCO
LL
34
40
40
40
40
40
Base-Outside
M
37-5/8
52-1/2
52-1/2
52-1/2
52-1/2
52-1/2
Base-Inside
N
29-5/8
44-1/2
44-1/2
44-1/2
44-1/2
44-1/2
HEIGHT
Base to Vent Outlet
O
70
87
87
87
87
87
Base to Steam Outlet
P
66
82-3/8
82-3/8
82-3/8
82-3/8
82-3/8
Base Frame
Q
12
12
12
12
12
12
Base to Bottom Boiler
R
16
16
16
16
16
16
CONNECTIONS
Chemical Feed
H
1
1
1
1
1
1
Feedwater, Right & Left
S
1-1/4
1-1/2
1-1/2
1-1/2
1-1/2
1-1/2
Auxiliary Connection
Z
1
1
1
1
1
1
Steam Nozzle (15 psig)A
Y
8 FLG
8 FLG
8 FLG
8 FLG
10 FLG
10 FLG
Steam Nozzle (150 psig)B
Y
4 FLG
4 FLG
4 FLG
4 FLG
4 FLG
4 FLG
Drain-Front & Rear (15 psig only) W
1-1/2
1-1/2
1-1/2
2
2
2
Blowdown-Front & Rear (150 W
psig)
1-1/4
1-1/2
1-1/2
1-1/2
1-1/2
1-1/2
Surface Blow (150 psig only)
T
1
1
1
1
1
1
Vent Stack Dia. (Flanged)
BB
12
16
16
16
16
16
Flange to Center Vent
CC
7
9
9
9
9
9
Rear Door Swing
DD
55
32
32
32
32
32
Front Door Swing
EE
55
67
67
67
67
67
Tube Removal, Rear
FF
123
103
103
139
139
139
Tube Removal, Front
GG
113
91
91
127
127
127
Min Room Length for Rear Tube RR
Removal
309
283
283
355
355
355
Min Room Length for Front Tube RF
Removal
299
236
236
308
308
308
Tube Removal thru Door
241
212
212
248
248
248
CLEARANCES
RD
NOTE: Accompanying dimensions, while sufficiently accurate for layout purposes, must be confirmed for construction by certified dimension prints.
A. Flanged 150 psig ANSI
B. Flanged 300 psig ANSI
Figure 1. Model CB Ohio Special Steam Boiler Dimensions - Sheet 2 of 2
8
1/11
100-225 HP
Model CB-OS
DIMENSION (INCHES)
BOILER HP
A
B
C
D
E
27
48
38
60
26
CB 125S thru 225S 33
55
45
68
32
CB 100S
Figure 2. Space Required to Open Rear Head on Model CB Ohio Special Boilers Equipped with Davits
FRONT
FLANGE
B
C
E DIA. HOLE
CL
VIEW A
A
BOILER ALL DIMENSIONS IN INCHES
HP
A
B
C
D
D
D
NEAR
SIDE
FAR
SIDE
VIEW B
100S
67
20-1/2
73-3/4 10
125S150S
79-1/2
26
60-3/4 10
175S225S
79-1/2
29-3/4
103-3/4 10
NOTE: A, B and C Dimensions may vary by 1/2 inch.
Figure 3. Model CB Ohio Special Boilers Lifting Lug Location
9
1/11
Model CB-OS
100-225 HP
BOILER HP
A
B
C
D
E
F
G
X
CB 100S
6
8
130
26
42
4
29-5/8
8-1/4
CB 125S, 150S
6
9
100
39-1/2
57-1/2
4
44-1/2
10-1/4
CB 175S, 200S, 225S
6
9
136
39-1/2
57-1/2
4
44-1/2
10-1/4
NOTES:
1. All numbers in table are in inches.
2. 6-inch high mounting piers recommended for use beneath the boiler base frame. The use of these piers provides increased inspection accessibility to the piping beneath the boiler and added height for washing down the area beneath the boiler.
Figure 4. Model CB Ohio Special Boiler Mounting Piers
ENGINEERING DATA
The following engineering information is provided for the Ohio Special Boilers. Ohio
Special boilers are designated by an “S” following the horsepower number.
Additional detail is available from your local Cleaver-Brooks authorized
representative.
Boiler Information
Table A8-2 shows heating surfaces for Model CB Ohio Special Boilers.
Table A8-3 shows steam volume and disengaging area for Model CB Ohio Special
Boilers.
Table A8-4 lists quantity and outlet size for safety valves supplied on Model CB Ohio
Special Boilers.
Table A8-5 gives recommended steam nozzle sizes based on 4000-5000 fpm
steam velocity. Model CB Ohio Special Firetube Boilers.
Table A8-6 shows recommended non-return valve sizes for Model CB Ohio Special
Firetube Boilers.
Table 2. Model CB Ohio Special Boilers Heating Surface
BOILER
HP
HEATING SURFACE (SQ-FT)
FIRESIDE
WATERSIDE
100S
350
388
125S-150S
358
386
175S, 200S, 225S
358
384
10
1/11
100-225 HP
Model CB-OS
Table 3. Model CB Ohio Special Boilers Steam Volume and Disengaging Area
BOILER HP
STEAM VOLUME CU-FT
STEAM RELIEVING AREA SQ-IN
HIGH PRESSURE A
LOW PRESSURE B
HIGH PRESSURE A
LOW PRESSURE B
100S
14.3
23.7
4367
4975
125S, 150S
27.3
30.6
4990
5132
175S, 200S, 225S
37.2
41.6
6791
6984
NOTES: Based on normal water level.
A. Based on 150 psig design pressure.
B. Based on 15 psig design pressure.
Table 4. Model CB Ohio Special Boilers Steam Boiler Safety Valve Openings
VALVE
SETTING
15 PSIG STEAM
100 PSIG STEAM
125 PSIG STEAM
150 PSIG STEAM
200 PSIG STEAM
250 PSIG STEAM
BOILER
HP
NO. OF OUTLET
VALVES- SIZE
REQ'D
(IN.)
NO. OF OUTLET
VALVES- SIZE
REQ'D
(IN.)
NO. OF OUTLET
VALVES SIZE
REQ'D
(IN.)
NO. OF OUTLET NO. OF OUTLET NO. OF OUTLET
VALVES- SIZE
VALVES- SIZE
VALVES SIZE
REQ'D
(IN.)
REQ'D
(IN.)
REQ'D
(IN.)
100S
1
2-1/2
1
2
1
2
1
125S
1
2-1/2
1
2-1/2
2
150S
1
3
1
2-1/2
175S
1
3
1
200S
1
3
2
225S
2
2-1/2
2
1-1/2
1
1-1/2
1
1-1/4
(1) 2
1
(1) 1-1/2
2
1
1-1/2
1
1-1/2
1
2-1/2
2
1
1-1/2
1
1-1/2
2-1/2
1
2-1/2
1
2
1
2
1
1-1/2
2
1
2-1/2
1
2-1/2
1
2
1
2
2
1
2-1/2
1
2-1/2
1
2
1
2
1
NOTE:
Valve manufacturers are Kunkle, Consolidated or Conbraco, depending on availability.
Table 5. Model CB Ohio Special Firetube Boilers
Recommended Steam Nozzle Size
(To Maintain 4000 to 5000 fpm Nozzle Velocity)
BOILER HP
OPERATING
PRESSURE
PSIG
100S 125S 150S 175S 200S 225S
15
8
8
8
8
10
10
30
6
6
6
6
8
8
40
6
6
6
6
6
8
50
4
6
6
6
6
6
75
4
4
4
6
6
6
100
4
4
4
4
6
6
125
4
4
4
4
4
4
150
2.5
3
3
4
4
4
200
2.5
2.5
3
3
4
4
NOTES:
1. Steam nozzle sizes given in inches.
2. Recommended steam nozzle sizes based on 4000 to 5000
fpm steam velocity. Spool pieces (300 psig flanges) are
available in the following sizes (in inches): 3x2-1/2x30,
4x3x30, 6x4x36, 8x6x48, and 10x8x48.
11
1/11
Model CB-OS
100-225 HP
Table 6. Model CB Ohio Special Firetube Boilers Recommended Non-Return Valve Size
BOILER
HP
BOILER CAPACITY
(LB/HR)
50
75
OPERATING PRESSURES (PSIG)
100
125
150
175
200
100S
3450
2-1/2
2-1/2
NA
NA
NA
NA
NA
125S
4313
3
2-1/2
2-1/2
2-1/2
NA
NA
NA
150S
5175
3
3
2-1/2
2-1/2
2-1/2
2-1/2
NA
175S
6038
3
3
2-1/2
2-1/2
2-1/2
2-1/2
NA
200S
6900
3*
3
3
3
3
2-1/2
2-1/2
225S
7736
3
3
3
3
3
2-1/2
2-1/2
NOTE:
Valve sizes (300# flanges) given in inches).
Standard non-return valve selections limited to a maximum 2 to
1 turndown (50% of full boiler output); selection based on typical
valve sizing recommendations. For final valve selection contact
your authorized C-B representative. For high turndown applications see Boiler Book Section I3, Table I3-2.
*Indicates pressure drop of less than 7.5 psig. All other selections
are less than 6 psig pressure drop.
Table 7. Blowdown Tank Sizing Information
BOILER HP
WATER (GAL)
100S
80
125S-150S
87
175S-225S
118
NOTE: Quantity of water removed from boiler by lowering normal water line 4"
Blowdown Water
Requirements
Some local codes require blowdown tanks to be constructed in accordance with
recommendations of the National Board of Boiler and Pressure Vessel Inspectors.
The National Board’s recommendations base the size of the blowdown tank on the
removal of at least 4 inches of water from the boiler.
12
1/11
09-09
100-225 HP
Model CB-OS
J AC K S HAF T
OIL MODULAT ING
C AM
C AM
ADJ US T ING
SCREW
G AS MODULAT ING C AM
R OT AR Y AIR DAMP E R
J AC K S HAF T AR M
J AC K S HAF T
DR IV ING AR M
OIL MODULAT ING
C AM F OLLOWE R
45
C AM ADJ US T ING
SCREW
OIL ME T E R ING V ALV E
G AS MODULAT ING
C AM F OLLOWE R
G AS ME T E R ING
V ALV E
R OT AR Y AIR
DAMP E R
R OD
MODULAT ING
MOT OR R OD
R OT AR Y AIR
DAMP E R S HAF T
60
R OT AR Y AIR
DAMP E R AR M
MODULAT ING MOT OR
MOT OR
F UE L OIL
C ONT R OLLE R
B UT T E R F LY
G AS V ALV E R OD
OV E R T R AV E L LINK AG E
45
MODULAT ING
MOT OR AR M
NOT IC E :
S E T T ING S IN DIAG R AM
INDIC AT E LOW F IR E
S E T T ING OF LINK AG E .
S P R ING LOADE D
B UT T E R F LY G AS V ALV E AR M
B UT T E R F LY G AS V ALV E
Figure 5. Complete Linkage Assembly, Combination Gas and Oil
13
1/11
Model CB-OS
100-225 HP
Figure 6. Gas Modulating Cam
Table 8. Gas pressure requirements, CB Ohio Special
BOILER HP
GAS TRAIN SIZE
UPSTREAM VALVE*
DOWNSTREAM*
GAS PRESSURE
100 HP
100 HP
1.5 in
1.5 in
BB
PC
BB
PC
0.6 - 4.1 psi
0.6 - 3.8 psi
125 HP
125 HP
1.5 in
1.5 in
BB
PC
BB
PC
0.7 - 5.0 psi
0.8 - 5.0 psi
150 HP
150 HP
1.5 in
1.5 in
BB
PC
BB
PC
1.0 - 5.0 psi
1.1 - 5.0 psi
175 HP
175 HP
175 HP
175 HP
1.5
1.5
2.0
2.0
in
in
in
in
BB
PC
BB
PC
BB
PC
BB
PC
1.3 - 5.0 psi
1.5 - 5.0 psi
0.8 - 1.3 psi
0.9 - 1.5 psi
200 HP
200 HP
200 HP
200 HP
1.5
1.5
2.0
2.0
in
in
in
in
BB
PC
BB
PC
BB
PC
BB
PC
1.7 - 5.0 psi
1.9 - 5.0 psi
1.2 - 1.7 psi
1.2 - 1.9 psi
225 HP
225 HP
225 HP
2.0 in
2.0 in
2.5 in
BB
PC
PC
BB
PC
PC
1.4 - 5.0 psi
1.5 - 5.0 psi
1.0 - 1.4 psi
* BB = Butter Ball; PC = Plug Cock
Standard Gas Train is highlighted
14
1/11
100-225 HP
Burner Information
Model CB-OS
The Ohio Special Firetube Boiler encompasses an integral front head that
includes the burner, combustion air fan, and controls as part of the boiler
package design.
The integral front head provides for burner/boiler design as a single unit
maximizing the compatibility between the boiler and burner.
Figure A8-5 shows a typical linkage assembly. The single point linkage
layout allows for easy adjustment and maximum repeatability of air/fuel
ratios. Included on all Ohio Special Boilers is an adjustable CAM assembly
shown in Figure A8-6.
Gas-Fired Burners
Table A8-8 shows regulated gas pressure requirements for gas trains for CB
Ohio Special Firetube Boilers.
Table A8-9 shows minimum required gas pressure altitude conversion.
Table A8-10 shows maximum gas consumption for natural gas and propane
vapor.
Figure A8-7 shows typical gas train components, and Figure A8-8 shows
typical gas train piping layouts for multiple boiler applications.
Figure A8-9 shows standard gas train sizes and locations for Model CB Ohio
Special Firetube Boilers.
Oil-Fired Burners
Fuel oil consumption information is shown on the boiler rating sheets in the
Dimensions and Rating Section.
Figure A8-10 shows the oil connection sizes and locations for Ohio Special
Boilers firing No. 2 oil.
Figures A8-11 through A8-14 show typical oil systems and layouts.
Boiler Room
Information
Figure A6-15 shows typical boiler room length requirements.
Figure A6-16 shows typical boiler room width requirements.
Stack Support Capabilities
100 hp Ohio Special Boilers can support up to 1,000 lbs without additional
support.
125-225 hp Ohio Special Boilers can support up to 2,000 lbs without
additional support.
15
1/11
Model CB-OS
100-225 HP
Table 9. Minimum required gas pressure altitude
conversion
ALTITUDE
(FT)
CORRECTION
FACTOR
ALTITUDE
(FT)
CORRECTION
FACTOR
1000
1.04
6000
1.25
2000
1.07
7000
1.30
3000
1.11
8000
4000
1.16
9000
5000
1.21
-
Table 10. Maximum gas consumption, natural gas
and propane
BOILER
HP
TYPE OF GAS AND HEAT CONTENT
NATURAL GAS
1000 (Btu/cu-ft)
PROPANE GAS
2550 (Btu/cu-ft)
1.35
100S
4185
1640
1.40
125S
5230
2050
-
150S
6280
2465
175S
7350
2870
200S
8370
3280
225S
9415
3690
To obtain minimum required gas pressure at altitudes above 700
feet, multiply the pressure by the listed factors:
Inches WC x 0.577 = oz/sq-in.
Oz/sq-in x 1.732 = Inches WC.
Inches WC x 0.0361= psig.
Oz/sq-in x 0.0625 = psig.
Psig x 27.71 = Inches WC.
Psig x 16.0 = Oz/sq-in.
Boiler Room
Combustion Air
When determining boiler room air requirements, the size of the room, air flow, and
velocity of air must be reviewed as follows:
1. Size (area) and location of air supply openings in boiler room.
A.Two (2) permanent air supply openings in the outer walls of the boiler room are
recommended. Locate (1) at each end of the boiler room, preferably below a
height of 7 feet. This allows air to sweep the length of the boiler.
B.Air supply openings can be louvered for weather protection, but they should
not be covered with fine mesh wire, as this type of covering has poor air flow
qualities and is subject to clogging by dust or dirt.
C.A vent fan in the boiler room is not recommended, as it could create a slight
vacuum under certain conditions and cause variations in the quantity of
combustion air. This can result in unsatisfactory burner performance.
D.Under no condition should the total area of the air supply openings be less than
(1) square foot.
E. Size the openings by using the formula:
Area (sq-ft) = cfm/fpm
2. Amount of air required (cfm).
A.Combustion air - rated bhp x 8 cfm/bhp.
B.Ventilation air - rated bhp x 2 cfm/bhp or a total of 10 cfm/bhp - up to 1000
feet elevation. Add 3 percent more per 1000 feet of added elevation.
3. Acceptable air velocity in Boiler Room (fpm).
A.From floor to (7) foot height - 250 fpm.
B.Above (7) foot height - 500 fpm.
C.Duct from air supply to boiler - 1000 fpm.
Example: Determine the area of the boiler room air supply openings for (1) 200 hp
boiler at 800 feet altitude. The air openings are to be 5 feet above floor level.
16
1/11
100-225 HP
Model CB-OS
•
Air required: 200 x 10 = 2000 cfm (from 2B above).
•
Air velocity: Up to 7 feet = 250 fpm (from 3 above).
•
Area Required: Area = cfm = 2000/250 = 8 Sq-ft total.
•
Area/Opening: 8/2 = 4 sq-ft/opening (2 required).
Notice
Consult local codes, which may supersede these requirements.
Stack/Breeching
Size Criteria
The design of the stack and breeching must provide the required draft at each boiler
flue gas outlet. Proper draft is critical to burner performance.
Although constant pressure at the flue gas outlet of the Ohio Special is not required,
it is necessary to size the stack/breeching to limit flue gas pressure variation. The
allowable pressure range is –0.25" W.C. to +0.25" W.C.
For additional information, please review Section I4, General Engineering Data
(Stacks) and Section F, Stacks. Stack and breeching sizes should always be provided
by a reputable stack supplier who will design the stack and breeching system based
on the above criteria. Your local Cleaver-Brooks authorized representative is capable
of assisting in your evaluation of the stack/breeching design.
17
1/11
Model CB-OS
100-225 HP
4
2
3
1
S
PILOT GAS LINE
FLOW
5
6
8
7
M
9
10
11
M
Gas
Supply
To
Burner
MAIN GAS LINE
Figure 7. Model CB Ohio Special Gas Train Components
18
1/11
100-225 HP
Model CB-OS
This figure illustrates the basic gas valve arrangement on Cleaver-Brooks boilers and shows the contractor's connection point. The valves and controls between the contractor connection point and the gas main in the street are
representative of a typical installation. Actual requirements may vary depending on local codes or local gas company requirements which should be investigated prior to preparation of specifications and prior to construction.
STREET GAS MAIN
MODEL
CB-OS
BOILERS
PLUG
COCK
MODEL
CB-OS
BOILERS
A
B
C
CONTRACTOR
CONNECTION
POINT
D
GAS TRAIN
ON BOILER
A. Utilities service valve.
B. Utilities service regulator.
C. Gas meter.
D. Piping from meter to boiler.
The size of the gas line from the meter to the connection point at the boiler can
be very important if gas pressures are marginal. The gas line sizing is dependent on:
1. Gas pressure at outlet of gas meter (C)
2. Rate of gas flow required, CFH
3. Length of pipe run (D)
4. Pressure required at contractor connection point.
The local gas utility will advise the pressure that is available at the outlet of their
meter.
Figure 8. Typical Gas Piping Layout
19
1/11
Model CB-OS
100-225 HP
A
MODEL CB
BOILER
HP
CONNECTION SIZE
(IN.) (NPT)
LOCATION
DIMENSION
“A” (IN.)
100S
1 1/2
46 1/2
125S-200
1 1/2
52
2
55
225S
BOILER
FRONT
PLAN VIEW
Figure 9. Model CB Ohio Special Firetube Boilers Standard Gas Train Connection Size and Location
BHP
RECOMMENDED OIL LINEA SIZES
(STANDARD PIPE)
(IN.-IPS)
SUPPLY
AND
RETURN
CONN
SIZES (IN.)
(NPT)
A
(IN.)
100S
3/4
125S-225S
3/4
STORAGE
TANK TO
BOILER OR
PUMP
CONNECT
PUMP TO
BOILER
RETURN
LINE TO
TANK
11-1/2
1
1
1
12-1/2
1
1
1
NOTES: See No. 2 Oil Line Sizing Instruction for systems with other conditions
A. For suction line condition with a maximum of 10 Feet of lift and a total of 100 feet of
suction line.
Figure 10. CB Ohio Special Boilers, No. 2 Oil Connection Size, Location and Recommended Line Sizes
20
1/11
100-225 HP
Model CB-OS
CHECK
VALVE
VACUUM
GAUGE
OIL PUMP
UNION
GATE VALVE
STRAINER
GATE VALVE
F.O.S.
RELIEF VALVE
F.O.R.
GATE VALVE
CHECK VALVE
BOILER
FRONT
BOILER
BASE FRAME
F.O.S.
Figure 11. No. 2 Oil Piping, Single Boiler
Installation, Remote Oil Pump
F.O.R.
CONTRACTOR
CONNECTIONS
AT THIS POINT
VACUUM GAUGE
CHECK VALVE
GATE VALVE
STRAINER
GATE VALVE
F.O.S.
OIL
PUMP
NO. 2
F.O.R.
OIL PUMP NO. 1
UNION
GATE VALVE
RELIEF
VALVE
(100 PSIG)
GATE VALVE
CHECK VALVE
USE LAYOUT FOR: MODEL CB . . 100S - 225S
Figure 12. No. 2 Oil Piping, Multiple Boiler
Installation, Remote Oil Pumps
BOILER
FRONT
BOILER
BASE FRAME
F.O.S.
F.O.R.
CONTRACTOR
CONNECTIONS
AT THIS POINT
21
1/11
Model CB-OS
100-225 HP
VACUUM GAUGE
STRAINER
GATE VALVE
CHECK
VALVE
STANDBY
OIL PUMP
F.O.S.
GATE
VALVE
UNION
GATE VALVE
RELIEF
VALVE
(100 PSIG)
F.O.R.
ADJUSTABLE
PRESSURE
RELIEF VALVE
(75 PSIG)
PRESSURE
GAUGE
GATE
VALVE
CHECK
VALVE
USE LAYOUT FOR: MODEL CB . . . . . . . 50 THRU 800 HP
Relief valve on the boiler
must be set at 100 psig so
that adjustable pressure
relief valve in the loop
system is in control.
BOILER
BASE FRAME
BOILER
FRONT
F.O.S.
CONTACTOR
CONNECTIONS
AT THIS POINT
Figure 13. No. 2 Oil Piping, Multiple Boiler Installation
F.O.R.
22
1/11
100-225 HP
Model CB-OS
FRONT
FEEDWATER
TANK
BOILER
FEEDWATER
PUMP
DRAIN
TRENCH
DWG A - MODEL CB
DWG B - MODEL CB
DWG C - MODEL CB
1. Shortest boiler room length (Dwg A) is obtained by allowing for possible future tube replacement through a window or doorway.
Allowance is only made for minimum door swing at each end of the boiler. This arrangement provides sufficient aisle space at the front of
the boiler but a “tight” space condition at the rear. If space permits, approximately 1.5 additional feet should be allowed at the rear for additional aisle and working space.
2. Next shortest boiler room length (Dwg B) is obtained by allowing for possible future tube replacement from the front of the boiler. Allowance is only made for minimum door swing at the rear. If space permits, approximately 1.5 additional feet should be allowed at the rear for
additional aisle and working space.
3. A slightly longer boiler room for Model CB (Dwg C) is obtained by allowing for possible future tube replacement from the rear of the boiler.
Allowance for door swing at the front provides sufficient aisle and working space at the front.
Figure 14. Boiler Room Length (Typical Layouts), Model CB Ohio Special
BOILER HP
100S
125S-225S
Dimension A
78”
82"
Dimension B
105”
115"
A
NOTES:
1. Recommended Minimum Distance Between Boiler and Wall.
Dimension “A” allows for a “clear” 42" aisle between the water
column on the boiler and the wall. If space permits, this aisle
should be widened.
2. Recommended Minimum Distance Between Boilers.
Dimension “B” between boilers allows for a “clear” aisle of 42”.
If space permits, this aisle should be widened.
B
FEEDWATER
TANK
BOILER
FEEDWATER
PUMP
DRAIN
TRENCH
Figure 15. Boiler Room Width (Typical Layout), Model CB Ohio Special
23
1/11
Model CB-OS
100-225 HP
Notes
24
1/11
Model CB Ohio Special Steam Boiler
100-225 hp, Steam 15, 150, 200, or 250 psig)
Sample Specification
Boiler Characteristics (Steam)
General Boiler Design . . . . . .
Steam Boiler Trim . . . . . . . .
Burner . . . . . . . . . . . . . . . .
Efficiency Guarantee . . . . . . .
Warranty . . . . . . . . . . . . . . .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
. . .27
. . .27
. . .28
. . .29
. . .33
. . .33
25
1/11
CB-OS
100-225 HP
26
1/11
100-225 HP
CB-OS
Model CB Ohio Special Steam Boiler
100-225 hp, Steam 15, 150, 200, or 250 psig)
The following sample specifications are provided by Cleaver-Brooks to assist you in specifying
your customer's specific needs and application.
The Sample Specifications are typically utilized as the base template for the complete boiler
specification. Contact your local Cleaver-Brooks authorized representative for information on
special insurance requirements, special code requirements, optional equipment, or general
assistance in completing the specification.
PART 1 GENERAL
1.01
BOILER CHARACTERISTICS (STEAM)
A. The Steam Boiler shall be Cleaver-Brooks Model CB Ohio Special Fuel Series
____ (100, 200, 700), ____ hp designed for ____ psig (15 or ____ psig
steam). The maximum operating pressure shall be ____ psig.
B. The boiler shall have a maximum output of ____ Btu/hr, or ____ horsepower
when fired with CS12-48 No. 2 oil and/or natural gas, ____ Btu/cu-ft.
Electrical power available shall be ____ Volt ____ Phase ____ Cycle and 115/
1/60 for the control circuit.
PART 2 PRODUCTS
2.01
GENERAL BOILER DESIGN
A. The boiler shall be a multi-pass horizontal firetube updraft boiler with 350
square feet of total heating surface for the 100 hp and 358 square feet of total
heating surface for the 125-225 hp boilers. It shall be mounted on a heavy
steel frame with integral forced draft burner and burner controls. The complete
packaged boiler is built as a unit with Underwriters Laboratories listed
controls.
1. The boiler shall be completely preassembled and fire tested at the factory.
The unit shall be ready for immediate mounting on floor or simple
foundation and ready for attachment of water, steam, fuel, electrical,
vent, steam, and blowdown connections.
B. Boiler Shell (Steam)
1. The boiler shell must be constructed in accordance with ASME Boiler
Code and must receive authorized boiler inspection prior to shipment. A
copy of the inspection report shall be furnished the purchaser.
2. Two lifting eyes shall be located on top of the boiler.
3. Front and rear doors on the boiler shall be hinged or davited. Doors are to
be sealed with fiberglass tadpole gaskets and fastened tightly using heavy
capscrews that thread into replaceable brass nuts.
4. Rear refractory and insulation shall be contained in the formed door
which must swing open for inspection.
5. The boiler tubes shall not include swirlers, turbulators, or other add-on
devices.
6. Front and rear tube sheets and all tubes must be fully accessible for
inspection and cleaning when the doors are swung open. The boiler shall
be furnished with adequate handholes to facilitate boiler inspection and
cleaning.
27
1/11
CB-OS
100-225 HP
7.
8.
•
For boilers 125 horsepower and over, a manhole shall be provided.
The exhaust gas vent shall be located near the front of the boiler on the
top center line and shall be capable of supporting:
100 hp 1000 lbs. and shall contain a stack thermometer.
•
125-225 hp 2000 lbs. and shall contain a stack thermometer.
9.
Observation ports for the inspection of flame conditions shall be provided
at each end of the boiler.
10. The boiler insulation shall consist of a 2 inch insulation under a sectional
sheet metal lagging.
11. The entire boiler base frame and other components shall be factory
painted before shipment using a hard-finish enamel coating.
2.02
STEAM BOILER TRIM
A. Low Water Cutoff/Feedwater valve (pump) control (150-250 psig design)
LWCO/Pump control shall be a CB LEVEL MASTER water level control system comprising a
microprocessor-based electronic controller, a non-contact, non-wearing, continuously reading
absolute level sensor and pressure chamber. The control system shall be designed as follows:
The electronic controller shall be mounted in the common control panel (see 2.4 below) and
operate in ambient temperatures from 32 degrees F to 125 degrees F. The pressure chamber
shall be boiler mounted and operate to pressures of 250 PSIG and the level sensor shall
operate to pressures of 250 PSIG and temperatures to 400 degrees F. The pressure-containing
components shall be constructed in accordance with ASME Code. A shielded, four conductor
cable with ground shall be run in metal conduit between the level sensor and the controller.
Supply power shall be 115VAC-1 phase- 60 Hz. All wiring shall be in compliance with the
National Electrical Code.
The pressure chamber shall have a sight glass mounted on the side. The level sensor shall
have an accuracy of .01" or greater. The electronic controller shall have level and error
indicating lights, alphanumeric display for messaging, reset/menu switch and the following
features:
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
k.
l.
m.
n.
o.
Continuous Level Indication
Low Water Cutoff & Alarm
High Water Alarm
Low & High Water Warning
Full Modulating Control of Modulating Feedwater Control Valve
Continuous Monitoring of Float Operation
Column Blowdown Detection and Reminder
Auto or Manual Reset
Real Time Clock
Alarm Annunciation
Alarm History Files with Time Stamp
Water Column Blowdown Record
Auxiliary Low Water Cutoff Check
RS 232 Interface
Maximum Contacts Rating 15 amps Resistive Load
B. Low Water Cutoff/Feedwater Pump Control (15 psig design)
A water column shall be located on the right hand side of the boiler complete with gauge glass
set, and water column blowdown valves. The boiler feedwater pump control shall be included
as an integral part of the water column to automatically actuate a motor driven feedwater
28
1/11
100-225 HP
CB-OS
pump maintaining the boiler water level within normal limits. The low water cutoff shall be
included as an integral part of the boiler feedwater control wired into the burner control circuit
to prevent burner operation if the boiler water level falls below a safe level.
C. Auxiliary Low Water Cutoff
Auxiliary low water cutoff shall be included, piped to the vessel, and wired to the burner
control circuit. A manual reset device shall be used on this control.
D. Steam Pressure Gauge
The steam pressure gauge shall be located on the side of the boiler and include cock and test
connection.
E. Safety Relief Valves
Safety valves of a type and size to comply with ASME Code requirements shall be shipped
loose.
F.
Steam Pressure Controls
The steam pressure control to regulate burner operation shall be mounted near the water
column.
2.03
BURNER
A. Mode of Operation
Burner operation shall be full modulation principle. The burner shall always return to low fire
position for ignition.
B.
Forced Draft Blower
1. All air for combustion shall be supplied by a forced draft blower mounted
in the front boiler door, above the burner, to eliminate vibration and
reduce noise level.
2. Maximum sound level of the boiler/burner package shall not exceed ____
dBA (when measured in accordance with ABMA Sound Test Standards).
3. The impeller shall be cast aluminum, radial blade, carefully balanced,
and directly connected to the blower motor shaft.
C. Combustion Air Control
Combustion air damper and cam operated fuel metering valves shall be operated by a single
damper control motor that regulates the fire according to load demand. Single point
positioning controls shall be provided to regulate operation of the damper control motor.
D. Fuel Specification and Piping
Refer to the following fuel series specifications:
•
Fuel series 700 - gas fired.
•
Fuel series 100 - light oil fired.
•
Fuel series 200 - light oil or gas fired.
E.
Fuel Series 700 - Gas Fired
1. Burner Type - The burner shall be integral with the front head of the boiler
and of high radiantannular gas entry on 125-225 hp. and multi-port type
gas entry on 100 hp. The burner shall be approved for operation on
natural gas fuel.
29
1/11
CB-OS
100-225 HP
2.
3.
Gas Pilot - The gas pilot shall be a premix type with automatic electric
ignition. An electronic detector shall monitor the pilot so that the primary
gas valve cannot open until pilot flame has been established. The pilot
train shall include two manual shut-off valves, solenoid valve, pressure
regulator and pressure gauge.
Gas Burner Piping - Gas burner piping on all units shall include pressure
regulating gas shutoff valve, motor operated with proof of closure switch
and plugged leakage test connection. The valve is spring return to start or
stop the gas burner and to close automatically in the event of power
failure, flame failure, low water or any safety shutdown condition. A
lubricating plug cock or butterfly shutoff valve shall be provided as a
means for a tightness check of the primary shut off valve. An additional
plug cock or butterfly shutoff valve shall be furnished at entrance to gas
train. Select one of the following:
• 100 hp High and low gas pressure switches shall be provided.
• 125-225 hp High and low gas pressure switches shall be provided.
A second motorized safety shutoff valve, plus an additional plugged
leakage test connection shall be provided.
4.
F.
Burner Turndown - Turndown range of the burner shall be 4:1 when firing
natural gas.
a. Fuel Series 100 - Light Oil Fired
b. Burner Type - The burner shall be integral with the front head of the
boiler, and shall be a low pressure air atomizing type approved for
operation with CS12-48, Commercial No. 2 oil.
c. Oil Pilot - The oil pilot shall be air atomizing type with automatic
electric ignition and include oil solenoid valve. An electronic
detector shall monitor the pilot so that the primary oil valve cannot
open until flame has been established.
d. Oil Pump - An oil pump with a capacity of approximately twice the
maximum burning rate shall be included. A separate motor driven
pump set, shipped loose to be installed in a location favorable to the
oil storage tank, shall be provided.
e. Oil Burner Piping - Fuel oil piping on the unit shall include oil
pressure regulating devices, oil metering controls, solenoid shutoff
valves, pressure gauges and fuel strainer, all integrally mounted on
the unit. A fuel oil controller shall be provided to combine all of the
fuel oil controls into a single casting which is mounted on the front
door of the unit. A single tip retractable nozzle shall be used for the
low pressure air atomizing burner. A low oil pressure switch shall be
included in the oil piping.
f.
Low Pressure Air Atomizing - Separate air compressor module
mounted on boiler base rail with low atomizing air pressure switch
shall be provided.
5. Burner Turndown - Turndown range of the burner shall be 4:1 when firing
No. 2 oil.
Fuel Series 200 - Light Oil or Gas Fired
1. Burner Type - The burner, integral with the front head of the boiler, shall
be a combination of the low pressure air atomizing type for oil and high
radiant annular gas entry on 125-225 hp and multi-port type for gas
30
1/11
100-225 HP
CB-OS
•
•
entry on 100 hp. The burner shall be approved for operation with either
CS12-48 Commercial No. 2 Oil or natural gas.
2. Gas Pilot - The gas pilot shall be premix type with automatic electric
ignition. An electronic detector shall monitor the pilot so that the primary
fuel valve cannot open until flame has been established. The pilot train
shall include a manual shut-off valve, solenoid valve, pressure regulator
and pressure gauge.
3. Oil Burner
a. Oil Pump - An oil pump with a capacity of approximately twice the
maximum burning rate shall be included. A separate motor driven
pump set, shipped loose, to be installed in a location favorable to
the oil storage tank, shall be provided.
b. Oil Burner Piping - Fuel oil piping on the unit shall include oil
pressure regulating devices, oil metering controls, solenoid shutoff
valves, pressure gauges and fuel strainer, all integrally mounted on
the unit. A fuel oil controller shall be provided to combine all of the
fuel oil controls into a single casting which is mounted on the front
door of the unit. A single tip retractable nozzle shall be used for the
low pressure air atomizing burner. A low oil pressure switch shall be
included in the oil piping.
c. Low pressure Air Atomizing - Separate air compressor module
mounted on boiler base rail with low atomizing air pressure switch
shall be provided.
d. Gas Burner
1) Gas Burner Piping - gas burner piping on all units shall include
pressure regulating gas shutoff valve, motor operated with
proof of closure switch and plugged leakage test connection.
The valve is spring return to start or stop the gas burner and to
close automatically in the event of power failure, flame failure,
low water or any safety shutdown condition. A lubricating plug
cock or butterfly shutoff valve shall be provided as a means for
a tightness check of the primary shut off valve. An additional
plug cock or butterfly shutoff valve shall be furnished at
entrance to gas train. Select one of the following:
100 hp High and low gas pressure switches shall be provided.
125-225 hp High and low gas pressure switches shall be provided. A second
motorized safety shutoff valve, plus an additional plugged leakage test connection shall
be provided.
e. Burner Turndown - Turndown range of the burner shall be 4:1.
G. Boiler Flame Safeguard Controller and Control Panel
1. CB780E Flame Safeguard Controller
Each boiler shall be factory equipped with flame safeguard controller providing technology and
functions equal to the Cleaver-Brooks Model CB780E.
Controller shall be computerized solid state having sequence and flame-on lights and digital
“first out” fault code indications of flame safeguard trip functions. It shall include dynamic
self-check logic. The controller shall have a fixed operating sequence incapable of being
manually altered. The sequence shall include start, pre-purge, pilot and main fuel ignition run
and post-purge cycles.
31
1/11
CB-OS
100-225 HP
Controller shall be the non-recycle type for maximum safety that shall shutdown the burner
and indicate as a minimum the following trip functions: pilot and main flame failure, high and
low fire proving switch faults, running interlocks open, false flame signal and fuel valve open
(when proof of closure switch is furnished).
The controller shall have a run/test switch. It shall allow interruptions to sequence just after
pre-purge, during pilot ignition trial and run cycles for adjustments to firing rate motor, damper
linkages and pilot flame for minimum turndown tests.
a.
Control Panel - The control panel shall be mounted on the side of the
boiler in a location convenient to the operator. The hinged metal
cabinet will have NEMA 12 rating that includes a neoprene dust seal
and a Yale cabinet key type lock.
The panel shall contain the boiler flame safeguard controller, blower motor starter, indicating
lights and selector switches.
The panel shall have a removable sub-base for mounting the flame safeguard controller,
blower motor starter, and terminal blocks. For combination gas-oil fired boilers, the panel
shall contain the fuel selector switch.
b.
Lights
•White - load demand.
•White - fuel valve open.
•Red - low water.
•Red - flame failure.
c.
Control Switches
•Burner On-Off.
•Manual-Automatic.
•Manual Firing Rate Control.
2.
d.Oil, heat and moisture resistant wire shall be used and identified
with circuit numbers corresponding to the electrical wiring diagram.
e. All electrical equipment and wiring shall be in conformance with
Underwriters Laboratories requirements.
f.
Boiler to be supplied with a control circuit transformer and fuse
protection for the control circuit.
Control Panel
a. The control panel shall be mounted on the side of the boiler in a
location convenient to the operator. The hinged metal cabinet will
have NEMA 12 rating that includes a neoprene dust seal and a Yale
cabinet key type lock.
b. The panel shall contain the boiler flame safeguard controller, blower
motor starter, indicating lights and selector switches.
c. Panel shall have a removable sub-base for mounting the flame
safeguard controller, blower motor starter, and terminal blocks. For
combination gas-oil fired boilers the panel shall contain the fuel
selector switch.
d. Oil, heat, and moisture resistant wire shall be used and identified
with circuit numbers corresponding to the electrical wiring diagram.
32
1/11
100-225 HP
CB-OS
e.
f.
All electrical equipment and wiring shall be in conformance with
Underwriters Laboratories requirements.
Boiler to be supplied with a control circuit transformer and fuse
protection for the control circuit.
2.04
EFFICIENCY GUARANTEE
A. The boiler must be guaranteed to operate at a minimum fuel-to-steam
efficiency of ____ percent from 25 to 100 percent of rating when burning
natural gas and ________ fuel-to-steam efficiency at 100% firing rate when
burning oil.
2.05
WARRANTY
A. All equipment is to be guaranteed against defects in materials and/or
workmanship for a period of 12 months from date of start-up or 18 months
from date of shipment, whichever comes first.
PART 3 EXECUTION
A. Shop Tests
The packaged boiler must receive factory tests to check the construction, controls, and
operation of the unit. All tests may be witnessed by the purchaser, if desired.
B.
Start-up Service
1. After boiler installation is completed, the manufacturer shall provide the
services of a field representative for starting the unit and timing the
operator at no additional costs.
a. A factory approved and authorized start-up report shall be submitted
to the customer/user at the time of start-up.
33
1/11