Page 1
■ Cast iron sectional heat exchanger
Commercial, Forced Draft
Hot Water or Steam Boiler
Commercial, Forced Draft
Hot Water or Steam Boiler
For Businesses, Institutions,
Apartments and other
commercial buildings
For Businesses, Institutions,
Apartments and other
commercial buildings
Commercial Hot Water
or Steam Boiler
Commercial Hot Water
or Steam Boiler
and push nipples
■ Vertical flue design
■ Easily assembled with short individual draw rods
■ Optional tankless heater for domestic hot water
■ Top or rear vent connections
■ Side clean out plates
■ Optional Return Temperature Control (RTC)
■ Sizes from 342,000 to 1,852,000 BTU/hr output
Heat exchanger constructed
and tested in accordance with
ASME Section IV standard.
Page 2
Ten reasons why you need
Commercial Hot Water
or Steam Boiler
Commercial Hot Water
or Steam Boiler
the Series 24 commercial boiler
1. Optimum for large installations –
Available in ten sizes from 342,000 to
1,852,000 BTU/hr output.
2. Gas, oil or combination gas/oil fired –
Customer’s preference in the choice of
fuels for economy and availability may be
an important part of the purchase decision.
3. Hot water or steam – The Series 24
has been designed to meet a wide variety
of installations.
4. Tankless heater available for domestic
hot water – Convenient for small spaces or
difficult installations that preclude a separate
water heater. Finned copper coil heats water
fast, and piping is easier to install.
5. Cast iron construction – Cast iron heat
exchanger sections and push nipples provide
long life. Cast iron resists the effect of
petroleum-based chemicals such as corrosion
inhibitors, pump lubricants and antifreeze. Cast
iron push nipples are important because they
expand and contract at the same rate as the
sections they join, which provides integrity to
the entire assembly.
6. Convenient delivery in sections – Delivery
is available in easily handled sections that can
be maneuvered through doorways and down
stairs making this boiler ideal for installations
where the boiler room is not readily accessible.
7. Easy assembly – Once in place, the sections
are easily assembled using a 3/4-inch drive
ratchet with a 1-1/16-inch-deep socket and
a wrench. Short draw rods pass through the
sections’ reinforced lugs, resulting in fast,
strain-free assembly.
8. Versatile venting options – The Series 24
is a forced draft boiler that eliminates the need
for high chimneys or draft inducers. Uniquely,
the boiler can be vented from either the top or
rear for maximum installation flexibility. Rear
outlet venting requires only 6-1/2 feet of
vertical clearance from floor to ceiling.
9. Hassle-free maintenance – All regular
maintenance access areas are located on the
left side, allowing the Series 24 to be installed
9 inches from the right sidewall. Removable
jacket panels and flue cover plates simplify
access to the heating surfaces.
10. It’s a CROWN! Satisfied customers are
our goal. So, all CROWN boilers employ the
latest technology for performance and safety.
We offer a wide range of products to meet
each customer’s individual needs, and we
offer competitive pricing, attractive warranties
and optional extended coverage.
Page 3
Top or rear flue outlet
with adjustable lock-type
damper includes
tapping for outlet
pressure readings
Left side jacket
panels and cleanouts
for easy access to
all flue surfaces
Tankless heater
for domestic
hot water
Cast iron vertical
flue design with
p
inned heating
s
urface achieves
maximum heat transfer
Rear cover includes
flame observation
port and plugged
tapping for over-fi
draft readings
R
einforced lugs and
individual draw rods
f
or easy assembly
Wet base
construction for
improved circulation
re
Front mounted
controls for easy
adjustment and
maintenance
Burner mounting
plate with flame
observation port
Your choice
of a Beckett
gas or oil burner
Cast iron nipples
ensure integrity
of section assembly
Standard Equipment
All Boilers – Sections unassembled, flush
insulated jacket, burner mounting plate, burner
adapter plate, rear flue damper (top outlet
optional), flue canopy, rear observation port cover,
target wall (V-903A), and miscellaneous plugs,
bushings and fittings.
Steam Trim – 15 PSI safety valve, L404A
pressuretrol, gauge glass assembly, steam gauge.
Water Trim – 30 PSI safety relief valve, L4006A
high limit, pressure temperature gauge.
Oil Boilers – Flange mounted flame retention
oil burner furnished with 2 stage fuel unit, primary
control and dual oil valves.
Gas Boilers – Flange mounted gas burner
with standard controls meeting the latest UL
requirements, dual gas valves and electronic
ignition.
Optional Equipment
Top outlet flue damper, tankless heaters, 50 PSI
relief valves (water), and combustion and
hydronic controls to meet ASME CSD-1.
Page 4
Series 24 Dimensions (in inches)
SAFETY/RELIEF
VALVE
‘F’ O.D. COLLAR
(STD. REAR OUTLET)
3
‘C’
‘A’
4
‘D’
INSULATED
JACKET
COMBINATION
LABEL
RATING
LABEL
� HIGH
PRESSURE
LIMI
T CONTROL/MR
� HIGH
PRESSURE
LIMI
T CONTROL/MR
NWL
57
MM#67 LWCO
LOWEST
PERMISSIBLE
W
ATER LEVEL
PLATE
(STEAM ON
LY)
FLOOR
FRONT VIEW
(STEAM)
LEFT SIDE VIEW
(STEAM)
FRONT VIEW
(WATER)
BURNER
MOUNTING
PLATE
‘H’‘G’6
(TYP)
1
REMOVABLE SIDE
PANELS
OVER-FIRE
PRESSURE SENSING;
NPT PLUGGED
REAR OBSERV
ATION
PORT
COVER
REAR FLUE
OUTLET W/
DAMPER
T
ANKLESS HEATERS
(‘E’ MAXIMUM ALLOWABLE)
‘B’
4” SUPPLY
(TYP)
TOP VIEW
BREECHING PRESSURE
SENSING;
PLUGGED (REAR OUTLET)
3
/8
-16
BREECHING PRESSURE
SENSING;
PLUGGED (TOP OUTLET)
3
/8
-16
1
8
13
1
2
3
1
8
6
1
2
16
STD.
1
8
16
1
8
1
8
41
1
2
9
1
4
47
3
8
4
1
4
4
1
4
23
1
2
32
1
8
3
1
2
16
5
8
3” RETURN
(4 PLACES)
FLAME
OBSERV
ATION
PORT
TEMPER
ATURE/
PRESSURE GUAGE
STEAM GUAGE
GUAGE
GLASS
SET
RATING LABEL
OPERATING
LIMIT
OPERATING
LIMIT
RETURN
TEMPERATURE
CONTROL
ASME DAT
A
LABEL
‘F’
O.D.
CO
LLAR
(OPTIONAL
T
OP OUTLET)
ASME DATA
LABEL
COMBINATION LABEL
INSTALLER/
SERVICE
LABEL
� PROBE TYPE
LOW
WATER
CU
T-OFF
BREECHING PRESSURE
SENSING;
PLUGGED (REAR OUTLET)
3
/8
-16
IN
IN
OUT
OUT
OUT
(TYP)
12” MIN
THREE HEATER MANIFOLDTWO HEATER MANIFOLD
FOUR HEATER MANIFOLD
FOR JACKET
REMOVAL
IN
1
1
1
1
1
1
2
2
2
2
2
2
3
3
3
3
4
4
5
MAXIMUM FLUTE BURNER BECKETT
1
APPROX.
NUMBER NUMBER NUMBER OF OUTLET MOUNTING K.D. BLR.
BOILER OF OF STEAM HEATERS DIAMETER PLATE WIDTH CF OIL CG GAS SHIPPING
MODEL SECTIONS ‘A’ ‘B’ RISERS ‘C’ ‘D’ ‘E’ ‘F’ ‘G’ ‘H’ ‘H’ WEIGHT LB.
24-03 3 18-1/4 12 1 – 9-1/8 1 7 8 9-3/4 20-7/8 1363
24-04 4 24-1/4 18 1 – 12-1/8 1 7 8 11-3/4 21-5/8 1675
24-05 5 30-1/4 24 1 – 15-1/8 1 8 8 11-3/4 21-5/8 1987
24-06 6 36-1/4 30 1 – 18-1/8 2 8 4 20-5/8 21-5/8 2273
24-07 7 42-1/4 36 2 – 21-1/8 2 8 4 20-5/8 28-5/8 2589
24-08 8 48-1/4 42 2 – 24-1/8 2 10 4 20-5/8 28-5/8 2901
24-09 9 54-1/4 48 2 – 27-1/8 3 10 4 21-1/8 29-1/8 3282
24-10 10 60-1/4 54 2 – 30-1/8 3 10 4 21-1/8 29-1/8 3614
24-11 11 66-1/4 60 2 – 33-1/8 3 12 4 22-5/8 29-1/8 3925
24-12 12 72-1/4 66 3 30 36-1/8 4 12 4 22-5/8 29-1/2 4252
● Not supplied as
standard equipment
Tankless Heater
Ratings in GPM
NUMBER OF 24 TANKLESS
BOILER
MODEL 1 2 3 4
24-03 6.75 — — —
24-04 7.5 — — —
24-05 7.5 — — —
24-06 7.5 15 — —
24-07 7.5
24-08 7.5 15 — —
24-09 7.5 15 22.5 —
24-10 7.5 15 22.5 —
24-11 7.5 15 22.5 —
24-12 7.5 15 22.5 30
Continuous draw heated from 40°F to 140°F
with 200°F boiler water.
HEATERS INSTALLED
15 — —
Multi-Heater Manifold
ITEMS DESCRIPTION
1 1-1/4” Copper Elbow
2 1-1/2” x 1-1/4” x 1-1/4” Copper Tee
3 2” x 1-1/2” x 1-1/4” Copper Tee
4 2” x 2” x 1-1/4” Copper Tee
5 1-1/4” Copper x MIP Adapter
Notes:
1. It is important that tankless heater sections
be correctly located in the boiler. Refer to
installation manual.
Pressure drop across each T-4 tankless
2.
heater = 5.25 PSI at 7.5 GPM fl
3. Locate heater control in heater identified as
ow rate.
Page 5
Burner Mounting Plates and Adapter Plates
FRONT VIEW
SIDE VIEWS
4” STANDARD
IDENTIFICATION NUMBER
‘A’
DIA
HOLE
‘B’ DIA
BOLT CIRCLE
‘C’
(REF)
4 8
8” EXTENDED
CAST IRON BURNER MOUNTING PLATES
STANDARD BURNER
ADAPTER PLATE
Commercial Hot Water or Steam BoilerCommercial Hot Water or Steam Boiler
FRONT VIEW BACK VIEW
F E
J2
J2
J1
J1
Q
K
M
G
T
B
P
P
N
S
A
D
C
BECKETT (“CF” SERIES) BURNER ADAPTER PLATE
I.D. ‘A’ ‘B’ ‘C’
BOILER MODEL PART NO. NO. DIA. DIA. REF.
24-03 THRU 24-05 330400 920 4-3/4 10 7-1/16
24-06 THRU 24-08 330401 921 6-1/8 10 7-1/16
24-09 THRU 24-12 330402 922 6-3/4 10 7-1/16
BECKETT (“CG” SERIES) BURNER ADAPTER PLATE
I.D. ‘A’ ‘B’ ‘C’
BOILER MODEL PART NO. NO. DIA. DIA. REF.
24-03 THRU 24-06 330400 920 4-3/4 10 7-1/16
24-07 THRU 24-08 330401 921 6-1/8 10 7-1/16
24-09 THRU 24-11 330403 923 7-1/4 10 7-1/16
24-12 330404 924 8-1/8 10 7-1/16
Note:
1. A burner adapter plate is needed for each boiler.
Control Tappings
TAPPING SIZE
LOCATION (IN.) STEAM BOILER W
A 4 Supply Supply
B 4
Supply (24-07 thru 24-12)
C 3 Blow-Off Valve Return
D 3 Return
Return (24-12)
E 3 Plug Blow-Off / Drain Valve
F 3 Plug Plug
G 1-1/2 Safety Valve / Surface Skim Tap Relief Valve
J1 1 Plug Plug
J2 1 Float L.W.C.O. Plug
K 3/4 Plug Probe L.W.C.O.
M 3/4 Operating Pressure Limit Control Operating Temperature Limit Control
N 3/4
Limit Control / Manual Reset Limit Control/Manual Reset
P 1/2 Gauge Glass/#67 L.W.C.O. Plug
Q 1/2
Gauge (Bush to 1/4”)
S 3/4 Tankless Heater Control Tankless Heater Control
T 3/4 Firing Rate Pressure Control Firing Rate Temperature Control
Plug (24-03 thru 24-06)
Plug (24-03 thru 24-11)
Hi Pressure Hi Temperature
Steam Gauge (Bush to 1/4”)
Temperature/Pressure
ATER BOILER
Plug
Series 24 Minimum Piping
Recommendations – Water Boiler
Impact of System Piping – Many hot water systems
are zoned. Some also use mixing valves to control the water
temperature in the system.
flow through the boiler to vary dramatically, depending on
the status of the zones or mixing valves. In addition, the
large water content of many commercial systems has the
potential to subject the boiler to operation with low return
temperatures for an extended period of time.
can shorten the life of a boiler due to thermal shock or flue
gas condensation.
Crown’s 3 Recommendations – On the following
pages, CROWN provides three basic recommendations
for near-boiler piping that are intended to maximize the
life expectancy of the boiler by protecting it from flue gas
condensation and thermal shock. Each protects the boiler
by making sure that both of the following conditions are met:
■ The flow through the boiler is high enough to
ensure a temperature rise of less than 40°F
These features can cause the
These factors
■ The return temperature does not fall below 135°F
for an extended period of time.
RTC Return Temperature Control – Piping
Recommendation 3 makes use of CROWN’s optional
TC (Return Temperature Control). This control provides an
R
economical and effective way of protecting the boiler from
thermal shock and condensation. It can be incorporated into
most hot water systems with minimal modifications to the
system design and operation. When this option is used on
multiple Series 24s, one R
The CROWN RTC is also available with an outdoor reset
option. This provides additional energy savings by
modulating system water temperature to match the
building load requirements.
TC is required for each boiler.
Page 6
Series 24 Minimum Piping Recommendations – Water Boiler
DRAIN VALVE
(SEE NOTE 4)
24-03 THRU 24-11 (W/20°F DROP)
24-03 THRU 24-12 (W/40°F DROP)
24-12 (W/20°F DROP)
DRAIN
VALVE
(SEE NOTE 4)
REAR OF
BOILER
REAR OF
BOILER
3” x 12” NIPPLE
AND BELL REDUCER
(SEE NOTE 3)
SUPPLY
RETURN
2
RETURN
RETURN
HEADER
RETURN
BRANCH
2
2A
23
2
1
2B
1
SUPPLY
1
BOILER CIRCUL
ATOR
(BY OTHERS - SEE NOTE 5)
DRAIN VALVE
(SEE NOTE 4)
SUPPLY
SYSTEM PUMP
CLOSELY
SPACED
TEES
MAX
4D
D
REAR OF
BOILER
RETURN
RETURN HEADER
RETURN BRANCH
2
2A
2B
23
2
1
24-12 (W/20°F DROP)
BOILER CIRCULATOR
(BY OTHERS - SEE NOTE 5)
DRAIN VALVE
(SEE NOTE 4)
SUPPLY
SYSTEM PUMP
CLOSELY
SPACED
TEES
MAX
4D
BOILER CIRCUL
ATOR
(BY OTHERS - SEE NOTE 5)
DRAIN VALVE
(SEE NOTE 4)
SUPPLY
SYSTEM PUMP
CLOSELY
SPACED
TEES
MAX
4D
D
REAR OF
BOILER
RETURN
3” x 12” NIPPLE
AND BELL REDUCER
(SEE NOTE 4)
REAR OF
BOILER
RETURN
RETURN HEADER
RETURN BRANCH
2
2
2A
2B
1
23
2
1
24-03 THRU 24-11 (W/20°F DROP)
24-03 THRU 24-12 (W/40°F DROP)
24-12 (W/20°F DROP)
Recommendation 1 is used
when the load is constant and
not varied due to mixing or
multiple zones. Use when:
■ system return water is not
less than 135° F for
prolonged periods of time
■ system flow does not impact
flow through the boiler
Recommendation 2 is a primary-secondary piping method
that maintains a constant flow through the boiler by using a
secondary boiler circulator. This arrangement isolates the
boiler from flow variations but does not safe-guard against
cold return water temperatures. Use when:
■ system return water is not less than 135° F
for prolonged periods of time
■ system flow does not impact flow through the
boiler (i.e. zoning, mixing)
PIPE SIZING AND NOTES FOR RECOMMENDATIONS 1 AND 2
RETURN PIPING SIZE (IN)
SUPPLY RETURN RETURN
PIPING HEADER BRANCH
SIZE (IN) (1) RETURN (2) (2A) (QTY.) SIZE (2B)
BOILER 20°F 40°F 20°F 40°F 20°F 20°F
MODEL DROP DROP DROP DROP DROP DROP
24-03 2 1-1/2 2 1-1/2 – –
24-04 2 1-1/2 2 1-1/2 – –
24-05 2 1-1/2 2 1-1/2 – –
24-06 2-1/2 1-1/2 2-1/2 1-1/2 – –
24-07 2-1/2 2 2-1/2 2 – –
24-08 2-1/2 2 2-1/2 2 – –
24-09 3 2 3 2 – –
24-10 3 2-1/2 3 2-1/2 – –
24-11 3 2-1/2 3 2-1/2 – –
24-12 4 2-1/2 4 2-1/2 3 (2) 3
Notes:
1. All piping is schedule 40.
2. Pipe sizes listed are based on a 20° F or 40°F differential (temperature drop).
Select one to match application.
When specified return piping is less than 3”, install 3” x 12” nipple and appropriate
3.
size bell reducer directly into boiler return tapping as shown.
Drain valve—ball valve preferable, gate valve acceptable alternative
4.
(supplied by others).—Minimum valve size per ASME code is 3/4 ” NPT.
Page 7
Recommendation 3 is used when the return water temperature goes below 135°F for prolonged periods of
24-03 THRU 24-11 (W/20°F DROP)
24-03 THRU 24-12 (W/40°F DROP)
BOILER CIRCULAT
OR
(BY OTHERS - SEE NOTE 5)
DRAIN VALVE
(SEE NOTE 4)
SUPPLY
DIVERTING
V
ALVE & ACTUATOR
SUPPLY
1
1
3
2
2
SYSTEM
PUMP
CLOSELY
SPACED
TEES
D
MAX
4D
REAR OF
BOILER
RETURN
RETURN
RETURN
SENSOR
(SEE NOTE 7)
3” x 12” NIPPLE
AND BELL REDUCER
(SEE NOTE 4)
SEE NOTE 6
SEE NOTE 5
24-03 THRU 24-11 (W/20°F DROP)
24-03 THRU 24-12 (W/40°F DROP)
24-12 (W/20°F DROP)
BOILER CIRCULAT
OR
(BY OTHERS - SEE NOTE 5)
DRAIN VALVE
(SEE NOTE 4)
SUPPLY
DIVERTING
V
ALVE & ACTUATOR
SUPPLY
1
BOILER CIRCULATOR
(BY OTHERS - SEE NOTE 5)
DRAIN VALVE
(SEE NOTE 4)
SUPPLY
1
1
3
DIVERTING
V
ALVE & ACTUATOR
3
2
2
SYSTEM
PUMP
CLOSELY
SPACED
TEES
D
MAX
4D
REAR OF
BOILER
REAR OF
BOILER
RETURN
RETURN
RETURN
SENSOR
(SEE NOTE 7)
RETURN
SENSOR
(SEE NOTE 7)
3” x 12” NIPPLE
AND BELL REDUCER
(SEE NOTE 4)
SEE NOTE 6
SEE NOTE 5
SUPPLY
1
2B
2A
RETURN BRANCH
SYSTEM
PUMP
CLOSELY
SPACED
TEES
D
MAX
4D
2
2
RETURN
RETURN HEADER
RETURN
SEE NOTE 6
SEE NOTE 5
24-07 THRU 24-11
24-03 THRU 24-06
(SEE NOTE 4)
(SEE NOTE 4)
(SEE NOTE 5)
(SEE NOTE 5)
(SEE NOTE 5)
(SEE NOTE 3)
SEE NOTE 2
(SEE NOTE 3)
RISER
WATER LINE
EQUALIZER
CLOSE NIPPLE
24” MIN.
18” MIN.
HARTFORD LOOP
(REQ’D ON GR
AVITY
RETURN SYSTEM)
REAR OF BOILER
BLOW-OFF/
DRAIN
VALVE
(SEE NOTE 3)
2” TO 4”
SUPPLY
1
1
1
3
4
4
4
3
2
2
2
2
2
2
‘A’
‘A’
‘B’
HEADER
(SEE NOTE 4)
24-07 THRU 24-11
(SEE NOTE 4)
(SEE NOTE 5)
(SEE NOTE 5)
SEE NOTE 2
(SEE NOTE 3)
RISER
WATER LINE
EQUALIZER
CLOSE NIPPLE
24” MIN.
18” MIN.
HARTFORD LOOP
(REQ’D ON GRAVITY
RETURN SYSTEM)
REAR OF BOILER
BLOW-OFF/
DRAIN
VALVE
(SEE NOTE 3)
2” TO 4”
SUPPLY
1
1
3
3
4
4
2
2
2
2
‘A’
‘A’
‘B’
RETURN
HEADER
(SEE NOTE 4)
24-12
(SEE NOTE 5)
SEE NOTE 2
RISER
WATER LINE
EQUALIZER
CLOSE NIPPLE
24” MIN.
18” MIN.
HARTFORD LOOP
(REQ’D ON GRAVITY
RETURN SYSTEM)
REAR OF BOILER
BLOW-OFF/
DRAIN
VALVE
(SEE NOTE 3)
DRAIN VALVE
(WET RETURN)
2” TO 4”
SUPPLY
1
3
4
2
2
‘A’
‘B’
RETURN
HEADER
(SEE NOTE 4)
time. This is also primary-secondary piping, but includes the addition of a 3-way valve, return water sensor and
boiler-mounted RTC Return Temperature Control.
PIPE SIZING AND NOTES FOR RECOMMENDATION 3
RETURN PIPING SIZE (IN)
SUPPLY RETURN RETURN
PIPING HEADER BRANCH
SIZE (IN) (1) RETURN (2) (2A) (QTY.) SIZE (2B)
BOILER 20°F 40°F 20°F 40°F 20°F 20°F
MODEL DROP DROP DROP DROP DROP DROP
24-03 2 1-1/2 2 1-1/2 – –
24-04 2 1-1/2 2 1-1/2 – –
24-05 2 1-1/2 2 1-1/2 – –
24-06 2-1/2 1-1/2 2-1/2 1-1/2 – –
24-07 2-1/2 2 2-1/2 2 – –
24-08 2-1/2 2 2-1/2 2 – –
24-09 3 2 3 2 – –
24-10 3 2-1/2 3 2-1/2 – –
24-11 3 2-1/2 3 2-1/2 – –
24-12 4 2-1/2 4 2-1/2 3 (2) 3
Notes:
1. All piping is schedule 40.
2. Pipe sizes listed are based on a 20° F or 40°F differential (temperature drop).
Select one to match application.
When specified return piping is less than 3”, install 3” x 12” nipple and appropriate
3.
size bell reducer directly into boiler return tapping as shown.
Drain valve—ball valve preferable, gate valve acceptable alternative
4.
(supplied by others).—Minimum valve size per ASME code is 3/4” NPT.
5. Maximum linear feet of pipe from 3-way bypass port to sensor location = 11 feet.
Bypass line shall be the same diameter as return
6. Minimum linear feet of pipe from point of mixing (where bypass meets return line)
to sensor location = 4 feet.
Install special 3” x 12” nipple with 1/4” NPT side tapping closest to boiler.
7.
Where applicable, use bell reducer to adapt to recommended return pipe size.
Proper boiler circulator sizing is listed in RTC literature.
8.
A.
Series 24 Minimum Piping Recommendations – Steam Boiler
RISER
RISER HEADER
BOILER (QTY.) & SUPPLY RETURN EQUALIZER
MODEL SIZE (1) (2) (3) (4) ‘A’ ‘B’
24-03 (1) 3” 3” 1-1/2” 2” – –
24-04 (1) 4” 4” 2” 2” – –
24-05 (1) 4” 4” 2” 2” – –
24-06 (1) 4” 4” 2-1/2” 2-1/2” – –
24-07 (2) 4” 6” 2-1/2” 2-1/2” 36” –
24-08 (2) 4” 6” 2-1/2” 2-1/2” 42” –
24-09 (2) 4” 6” 2-1/2” 2-1/2” 48” –
24-10 (2) 4” 6” 3” 3” 54” –
24-11 (2) 4” 6” 3” 3” 60” –
24-12 (3) 4” 6” 3” 3” 30” 36”
PIPING SIZE (IN)
SPACING (IN)
Notes:
1. All piping is schedule 40.
2. To prevent condensate from being trapped in header, do not reduce equalizer elbow at header
connection.
Drain/blowoff valve—ball valve preferable, gate valve acceptable alternative (supplied by others).
3.
• Mininim valve size per ASME code is 3/4” NPT 24-03/24-05; 1” NPT 24-06/24-10;
24-11/24-12.
1-1/4” NPT
• Increasing the valve size will improve the blowdown operation
•
In all cases, piping connection blowoff valve to boiler should be full size to the point of discharge.
4. For pumped return systems, see Series 24 installation manual.
Page 8
Series 24 Specifications
Commercial Hot Water or Steam BoilerCommercial Hot Water or Steam Boiler
BURNER HEATING WATER BOILER WEIGHT
NET I=B=R RATING INPUT SURFACE NET
GROSS (SQ. FT.) FIREBOX IN (GAL.) (LBS.) VENT
BOILER HORSE- OUTPUT SQ. FT. MBH MBH OIL GAS VOLUME FIREBOX DIA.
MODEL POWER (MBH) STEAM STEAM WATER (GPH) (MBH) STEAM WATER (CU. FT.) (“W.C.”) STEAM WATER STEAM WATER (IN.)
24-03 10.2 342 1071 257 297 3.05 438 34.2 37.0 3.2 .33 44.5 66.0 1439 1618 7
24-04 14.1 471 1471 353 410 4.10 594 48.6 54.3 4.8 .38 53.0 75.0 1811 1995 7
24-05 18.9 634 1983 476 551 5.50 792 63.0 71.5 6.4 .31 61.5 84.0 2184 2372 8
24-06 23.8 797 2492 598 693 6.90 990 77.5 88.8 7.9 .38 70.0 93.0 2557 2749 8
24-07 28.0 937 2929 703 815 8.10 1174 91.9 106.0 9.5 .36 78.5 102.0 2930 3126 8
24-08 32.5 1087 3396 815 945 9.40 1358 106.3 123.3 11.0 .35 87.0 111.0 3303 3503 10
24-09 39.3 1316 4146 995 1148 11.40 1641 120.7 140.5 12.6 .35 95.5 120.0 3676 3880 10
24-10 45.0 1505 4788 1149 1309 13.00 1867 135.1 157.8 14.2 .40 104.0 129.0 4048 4257 10
24-11 50.5 1690 5429 1303 1470 14.60 2093 149.5 175.0 15.7 .45 112.5 138.0 4421 4634 12
24-12 55.3 1852 5983 1436 1610 16.00 2320 164.0 192.3 17.3 .49 121.0 147.0 4794 5011 12
Notes:
1. Trim suffix S = Steam Boiler W = Water Boiler
Fuel suffix
2. I=B=R net ratings shown are based on piping and pick-up allowances which vary from 1.333 to 1.289 for steam and 1.15 for water. Consult manufacturer for installations having unusual piping and pick-up
requirements, such as intermittent system operation, extensive piping systems, etc. The I=B=R burner capacity in GPH is based on oil having a heat value of 140,000 BTU per gallon.
3. Firebox volume does not include added volume of 8” extended burner mounting plate (BMP). If 8” BMP is specified (refer to Figure 1), add 0.7 cu. ft. to volume listed above.
4. Boiler ratings are based on 12.5% CO2 (oil) and 9.7% CO2 (natural gas), + .10” (inches) water column pressure at boiler flue outlet. Ratings shown above apply at altitudes up to 1000 feet on oil and 2,000
feet on gas. For altitudes above those indicated, the ratings should be reduced at the rate of 4% for each 1000 feet above sea level.
Maximum
Standard Safety (Relief) V
N = Natural Gas O = Oil
Allowable Working Pressure: Steam Boiler – 15 PSI, Water Boiler – 50 PSI
alve Set Pressure: Steam Boiler – 15 PSI, Water Boiler – 30 PSI
Beckett Gas Burners (Natural Gas)
PRESSURE
CONTENT w/ WATER
Beckett Oil Burners
Min. Inlet Gas
Boiler Burner Rate STD. Motor Pressure Train
Model Model Control Voltage H.P. (in W.C.) Size
24-03 CG10.1S On/Off 120/60/1 1/3 3.2 1”
24-04 CG10.4S On/Off 120/60/1 1/3 3.6 1”
24-05 CG10.5S On/Off 120/60/1 1/3 4.3 1-1/4”
24-06 CG10.6S On/Off 120/60/1 1/3 4.4 1-1/2”
24-07 CG15.3S Lo/Hi/Lo 120/60/1 1/2 4.0 1-1/2”
24-08 CG15.4S Lo/Hi/Lo 120/60/1 1/2 4.4 1-1/2”
24-09 CG25.2S Lo/Hi/Lo 120/60/1 3/4 4.3 1-1/2”
24-10 CG25.3S Lo/Hi/Lo 120/60/1 3/4 4.9 1-1/2”
24-11 CG25.4S Lo/Hi/Lo 120/60/1 3/4 4.9 1-1/2”
24-12 CG50.2S Lo/Hi/Lo 208-240/60/1 2 3.9 1-1/2”
Minimum gas pressures shown are for standard burners only.
See manual for minimum gas pressure when other size gas trains are used.
AVAILABLE FROM
Boiler Burner Rate STD. Motor
Model Model Control Voltage H.P.
24-03 CF500 On/Off 120/60/1 1/3
24-04 CF800 On/Off 120/60/1 1/3
24-05 CF800 On/Off 120/60/1 1/3
24-06 CF1400 Lo/Hi/Lo 120/60/1 1/2
24-07 CF1400 Lo/Hi/Lo 120/60/1 1/2
24-08 CF1400 Lo/Hi/Lo 120/60/1 1/2
24-09 CF2300A Lo/Hi/Lo 120/60/1 3/4
24-10 CF2300A Lo/Hi/Lo 120/60/1 3/4
24-11 CF2500 Lo/Hi/Lo 240/60/1 2
24-12 CF2500 Lo/Hi/Lo 240/60/1 2
Since 1949, homeowners have depended on us
for quality, value and service.
3633 I Street, P.O. Box 14818
Philadelphia, PA 19134
Phone: (215) 535-8900 Fax: (215) 535-9736
www.crownboiler.com
S24-12/05 (25M)
PN980521
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