LGB-Commercial Gas Boiler
Weii-Mclain
Gas
Water or Steam
MBH: 400-2,860
Combustion Eff.: 81%
Net load Range
Hot Water
282,000 to 2,014,000 BTU/ Hr.
Steam
1,013 to 7,496 Sq. FT.
~
Versatile Combustion Control Systems
~ Made with Weii-Mclain Quality
~ Applications:
Apartment Buildings
Commercial Buildings
Schools and Other Institutions
Multiple Boilers
Indirect-Fired Water Heating
••• And Much More
Design Advantages
Cast Iron Sections
LGB sections are made of durable cast iron for long life.lfs not uncommon for Weii-Mclain
cast iron boilers to last 35 years or more.
Sections are not face ground; the tough outer skin is retained to protect against corrosion.
The sections are studded with heat pins that cause the hot gases to swirl abou~ scrubbing
the entire surface for greater heat transfer and maximum operating efficiency.
Sealing Rope
Sealing rope between the sections assures a permanent, gastight seal. When installed,
the rope is visible between sections so the boiler can be checked for tightness. Sealing
rope- astandard feature of Weii-Mclain commercial boilers - allows for expansion and
contraction of the sections, is impervious to heat and moisture, will not crack and will last
the life of the boiler.
Section Seal
Modern elastomer sealing rings in the port openings assure a watertight seal. Because of the
elasticity of the seals (unlike metal push nipples), they fill any gap caused by imperfections in
the port openings, misalignment of sections or expansion and contraction.
Combined with short draw rods, sealing rings also permit faster section assembly. Lugs and
sockets assure proper section alignment during assembly; the machined surfaces of the port
openings control the compression ratio of the rings.
Rear Cleaning
Removing the rear jacket panel and
steel clean out plates expose the flue
passages for inspection and cleaning.
Factory-Assembled Base and Burners
The insulated, galvanized steel base houses the gas
manifold and one-piece, high temperature aluminized
steel burners. These burners feature efficient
performance, excellent flame characteristics, and quiet
ignition and extinction. Burners provide fixed primary air
- no adjustment required for approved gases.
One burner/base assembly and one gas train are
furnished for the LGB-4 through 12 and two each for the
LGB-13 through 23.
Features...Advantages...Benefits
• 81% Operating efficiency saves energy. The LGB is the highest efficiency cast iron atmospheric gas boiler
available. Exceeds efficiency requirements of ASH RAE 90:1.
• Cast iron sections for corrosion resistance and long life.
• Compact design saves valuable space... only 50-3/8" high, allowing more headroom for piping and venting.
• Patented section sealing method, short draw rods and sealing rope speed section assembly to reduce
installation time.
• Extra-large 9" top port opening forms an internal header for better water circulation. Large steaming area
assures rapid generation of dry steam.
• AGA design certified for natural and propane gas. Ratings approved by The Hydronics Institute Division of
GAMA (I=B=R) for natural and propane gas.
• Factory-assembled gas train located within the boiler jacket. (Except for aiiiRI boilers and LGB-21 through
23 boilers with CSD-1 /FM.) All LGB-6 through 23 boilers are capable of low-high-low or staged firing with an
additional operating limit control.
• Factory-assembled base and burners reduce installation time.
• Simplified piping. The largest LGB steam boiler requires only two risers.
• Built-in air separator in water boilers. Air is diverted to the expansion tank through a 1" tapping next to
supply outlet.
• Steel jackets with durable powdercoat finish in Wail-Mclain blue... completely insulated... designed for
fast installation.
• 10 Year Limited Warranty. Covers cast iron sections.
Combustion Control
System Options
Description of
Major Components
Manual Main Shutoff Valve
Diaphragm Gas Valve w/Reg. & Pilot Takeoff
Diaphragm Gas Valve
Diaphragm Gas Valve - 2 Stage w/Regulator
Motorized Gas Valve wI Actuator (On/Off)
Low Gas Pressure Switch
High Gas Pressure Switch
Normally Open Solenoid Vent Valve
Manual Leak Checking Gas Valve
Leak Test Cock
Pilot Shutoff Cock
Pilot Solenoid Valve
Pilot Regulator
UCS Control Module
Flame Guardian® Control System
CSD-1 Control Panel
WMBC-1 A Control Panel
WMBC-2A Control Panel
Detailed Information
I LGB
LGB I LGB
LGB
LGB
LGB
LGB
LGB
LGB
4-5
6-12 13-20 21-23
6-12
1
3-20
21-23
5-12
5
A.G.A. A.G.A. A.G.A. A.G.A. CSD-1 CSD-1 CSD-1 CSD-1 IRI
&FM &FM &FM
&FM
1
2
2
1
LGB
13-23
IRI
1
2
1
1
1
1
1
2
2
1
1
1
2
1
2
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
1
2
1
1
2
2
2
2
1
1
2
1
1
1
1
4
2
2
2
1
1
2
1
1
1
3
2
2
2
2
2
2
1
1
2
2
1
1
1
Page 5
Page6
Page 7
Optional WFFP Control Panel for Standard (A.G.A.) and
CSD-1 Systems for LGB 6-23
Panel Features
• Main flame failure lockout.
• 4 indicator lamps: call for heat pilot proven, main flame proven,
and flame failure (81amps on WFFP-2 panel).
• Isolated alarm contact to indicate flame failure.
• Power-on switch, fuse(s), and terminal strip.
• Optional flame failure alarm bell.
r----=
16 518
l
r -13%- -J
r
r
79116
13 13116
r2
3/8 _'" _ __
_
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15718 -
l
13 Y.
-~-....'J
L
_
ill
L_
1
-
-
3116 MOUNTING HOLES
13116
Re7ess
Standard Combustion Control Systems
Standard (A.G.A.) and FM Control Systems of LGB 4-5
Universal Control System Features:
One Weii-Mclain UCS ignition control module and wire harness are furnished as standard
equipment with each base assembly.
On a call for heat, the UCS produces a spark to ignite the pilot. When the pilot flame is proven,
the main gas valve opens with a built-in, slow opening soft ignition.
In the event the pilot is not proven during a timed trial for ignition, the UCS control system
will provide 100% shutoff. After a timed 5-minute delay, another ignition sequence will
automatically be initiated.
The control system has been certified by AG.A. and all components are UL Listed.
Factory-Assembled Gas Train:
The gas train allows for fast and easy installation. A
slow-opening, soft ignition, high capacity, combination
gas valve is used on the LGB 4-5 boilers.
Standard (A.G.A.) Control Systems for LGB 6-23
and FM Control Systems for LGB 6-20
WFG Flame Guardian® Control System Features:
A pre-wired WFG control system consisting of a mounting plate, two Weii-Mclain UCS
control modules and terminal block are furnished as standard equipment with each
base assembly.
On acall for heat, the pilot proving control module provides a spark to ignite the pilot.
When the pilot flame is proven, the first stage of the two-stage gas valve opens and all
burners light on low fire. When the main flame sensor proves carryover, the second stage
of the gas valve opens and the burners go to high fire.
In the event the pilot or main flame is not proven during a timed trial for ignition, the
WFG control system will provide 100% shutoff. After a timed 5-minute delay, another
ignition sequence will automatically be initiated. The control system provides multiple
ignition trials.
The control system has been design certified by AG.A. and all components are UL Listed.
Low-High-Low Firing:
LGB 6-23 boilers can provide low-high-low firing with the addition of a water
temperature or steam pressure control.
Factory-Assembled Gas Train:
The gas train allows for fast and easy installation. A dual gas
valve train has an on/off diaphragm valve and a low-high-low
regulated gas valve.
Additional Combustion Control Systems
CSD-1 Systems for LGB 5
Control System Features
Apre-wired control panel with one ignition control module, a
manual reset relay with indicator light and a terminal block are
furnished as standard equipment with each base assembly.
On a call for heat, the control module produces a spark to ignite
the pilot. When the pilot flame is proven, the combination gas
valve opens with a built-in, slow opening soft ignition.
Upon two consecutive pilot flame failures, the control module will
trip the manual reset relay and illuminate the red lockout light.
The lockout conditon(s) should be corrected before pressing the
red reset button to reset the boiler. The control system has been
certified by A.GA and all components are UL Listed.
CSD-1 Systems for LGB 6-20
Control System Features
Apre-wired control panel with one pilot-proving module, one main
flame proving module, a manual reset relay with indicator light and a
terminal block are furnished as standard equipment with each LGB
6-12 boilers. For LGB 13-20, tm pre-wired control panels are provided,
one for each base.
On a call for heat, the pilot proving control module produces a spark
to ignite the pilot. When the pilot flame is proven the first stage of
the two-stage gas valve opens. All burners light on low fire. When
the main flame sensor proves carryover, the second stage of the
gas valve opens and the burners go to high fire.
Upon two consecutive pilot flame failures or on failure to sense
main flame, the control module will trip the manual reset relay and
illuminate the red lockout light. The lockout condition(s) should be
corrected before pressing the red reset button to reset the boiler.
For LGB 13-20, the control systems for each base will operate
independently of each other.
The control system has been certified by A.GA and all components
are UL Listed.
CSD-1 &FM Control Systems for LGB 21-23
and IRI Control Systems for LGB 5-23
Control System Features:
A pre-wired WMBC control panel is furnished as standard equipment.
The gas train is located outside the boiler jacket.
On acall for heat, the pilot control circuit produces a spark and opens
the pilot solenoid allowing the pilot to ignite. For LGB 13-23, the universal
ignition control then produces a spark to ignite the pilot on the second
base. After the pilot(s) has been proven, the flame safeguard control
energizes the main flame circuit allowing the main burners to ignite at
low fire. The main pilot is the de-energized and the main flame sensor
proves the main burner operation at low fire. For LGB 13-23, the pilot on
the second base continues to burn during the boiler "on" cycle. The
flame safeguard control then energizes the downstream gas valve
allowing the boiler to fire at high fire.
If the pilot or main flame are not proven during the start-up sequence,
then the flame safeguard control will lockout on safety. A red indicator
light and alarm bell will energize. The lockout condition(s) should be
corrected. Then press red reset button on flame safeguard to reset
control and start automatic 5-minute delay. The control system will
permit a normal start-up.
The control system has been certified by A.G.A. and all components
are UL Listed.
WMBC Control Panel Features:
• Proven main flame with interrupted pilot for main base; pilot is extinguished after
10-second trial for ignition. For two-base boilers, the second base has a intermittent pilot;
the pilot on second base continues to burn during boiler "on" cycle.
• Pre-purge timer to provide 5-minute enforced wait after flame failure.
• Flame failure alarm bell.
• Five indicator lamps: power on, call for heat, pilot on, main flame on, and flame failure.
• High-low fire control terminals. Low-high-low fire may be provided with a water
temperature or steam pressure control.
• Flame safeguard primary control.
• Power-on switch, pilot-on switch, main-flame-on switch, alarm silencer switch,
fuse and terminal strip.
Fuse protection
(spare furnished)
16-gauge panel finished
in Weii-Mclain blue
Hinged front cover
(may be removed
if necessary)
Recessed indicator lights
and switches for
maximum protection
Removable lexan lenses
with easily replaced
incandescent bulbs •
no dimming
light Indicates flame
failure
Key lock on
front cover - -- Quick-disconnect type
connectors
Wiring diagrams and
operating sequence
included in pocket
Knockouts for field
application of additional
switches
Piping Connections
Water Boilers-Recommended Piping
Piping Notes:
• Alternate Piping - for LGB-4 through 12 only:
If desired, all three piping connections (supply, return and
expansion tank) can be taken off same end of boiler.
• Supply and return sizes in table below for water boilers refer
to minimum size of pipe connected to boiler for 20° or higher
temperature drop between supply and return.
Recommended Minimum Pipe Sizes
(20° Rise Through Boiler)
Boiler
Model
Pipe Size
Supply and Return
LGB-4
LGB-5
LGB-6 through 8
LGB-9 through 16
LGB-17 through 23
Steam Boilers
2"
2-1 /2"
3"
4"
5"
Recommended Minimum Pipe Sizes
For Single Risers
Boiler
Riser
Header
Equalizer
Model
j
A
H
Steam Supply
4"
5"
6"
LGB-4 through 8
LGB-9 through 11
LGB-12
4"
5"
6"
2"
2-1 /2"
2-1 /2''
Recommended Minimum Pipe Sizes
For Dual Risers
Boiler
Model
LGB-13 through 15
LGB-16 through 19
LGB-20 through 23
Riser
A B
4"
5"
6"
4"
5"
6"
Header
H
Equalizer
6"
6"
8"
4"
4"
4"
j
Standard, Additional and Optional Equipment
Standard Equipment, All units:
Cast Iron Sections
Insulated Extended Jacket
Aluminized Steel Collector Hood(s)
And Draft Hood(s)
Control Transformer (120 /24v)
Factory-Assembled Burner And Base Unit(s)
One-Piece Aluminized Steel Burners
Gas Manifold
Aluminized Steel Base Panels
Hi-Temp Insulated Board
Wiring Harness: Junction Box And
Pre-Wired Flexible Conduit
Standard Equipment, LGB-4 And 5:
Intermittent Electronic Ignition System (UCS):
Intermittent Ignition Control Module
Electronically Supervised Pilot Burner
With Ignition Electrode And Flame Rod
Wire Harness
Standard Equipment, LGB-6 Thru 23:
Flame Guardian® Panel Wrth Flame
Rectification Electronic Control System For
Each Base Assembly
Pre-Wired Control Panel
Terminal Block
TIM:l Ignition Control Modules Having
Integral Spark Generators
Intermittent Electronic Ignition Pilot System
Electronically Supervised Pilot Burner
With Ignition Electrode And Flame Rod
Main Flame Sensor Rod
Standard Equipment, Water Boilers:
Combination Operating And High limit
Temperature Control (LGB-4 Thru 20 Only)
Operating Temperature Control (LGB-21 Thru 23 Only)
High Limit Temperature Control (LGB-21Thru 23 Only)
Combination Pressure Temperature Gauge
30 PSIASME Relief Valve-Side Outlet
Built-In Air Eliminator In End Sections
Probe-Type Low Water Cutoff, PS-851-120 (Packaged Only)
Standard Equipment, Steam Boilers:
Operating Pressure Control
High Limit Pressure Control
Compound Pressure-Vacuum Gauge
Gauge Cocks, Glass And Guards
15 PSI ASME Relief Valve-Side Outlet
Float-Type Low Water Cutoff, MM No. 61 LWCO
Additional Equipment:
WFFP Control Panels (LGB-6 Thru 23)
WMBC Control Panels (LGB-5 Thru 23)
Probe -Type Low Water Cutoff, PS-851-120
(Non-Packaged Water Only)
Factory-Assembled Sections (LGB-4 Thru 14 Only}
Are-Tested Packaged Unit (LGB-4 Thru 14 Only)
1-1 /2" Inspection Tappings With Brass PlugsTm For Each Section
80 PSI Working Pressure Test Of Sections
Water Level Controls And Low Water Cutoffs
Low-High-Low Firing (LGB-6 Thru 12 Only)
Stage Firing (LGB-13 Thru 23 Only)
Energy Management Control Systems (BCP Panels)
IRI, FM And CSD-1 Control Systems
Natural Gas To Propane Gas Conversion Kit
W-M and PLUS Indirect-Fired
Water Heaters
W-M Maxifto® Pool Heaters
W-M Brazed Plate Heat Exchangers
WFFP Control Panel Equipment:
Standard:
WFFP-1 Panel (LGB-6 Thru 12)
WFFP-2 Panel (LGB-13 Thru 23)
3Q-second1ime Delay Relay (two on WFFP-2)
Tm 24-vott DPDT relays (four on WFFP-2)
Terminal Block
Fuse (two on WFFP-2)
Toggle Switch
Four Indicator Lamps (eight on WFFP-2)
Additional:
Alarm Bell and Transformer for Remote Indication of Flame Failure
Alarm Bell- Panel-Mounted
WMBC Control Panel Equipment:
Standard:
WMBC-1A Panel (LGB-5 Thru 12)
WMBC-2A Panel (LGB-13 Thru 23)
Motorized Gas Train
Interruptible PUot (Intermittent PUotfor
Adjacent Base and Additional Control Module)
Pre-Wired Control Panel:
Flame Safeguard Primary Control
Pre-purge Control Timer
Relay(s)
Terminal Block
Fuse (two on WMBC-2A)
Four Toggle Switches
Five Indicator Lamps
Alarm Bell
Dimensions
A
sectional length
:l
c
1-112-11-- B
.-; II
()
w
Front View
Right View
5-9/16
~------~1Q------~
Dimensions (inches)
se
~~---.:,~~
: I,r .f·•:!,
6"Supply
:::E4
50-13116
6" Supply
Cl C
Left View
Water line
()
33-7/16
'r--------.~
L
_ __
Model
LGB-4
LGB-5
LGB-6
LGB-7
LGB-8
LGB-9
LGB-10
LGB-11
LGB-12
LGB-13
LGB-14
LGB-15
LGB-16
LGB-17
LGB-18
LGB-19
LGB-20
LGB-21
LGB-22
LGB-23
A
18
23
28
33
38
43
48
53
58
63
68
73
78
83
88
93
98
103
108
113
B
9
11 Y2
14
16Y2
19
21 Y2
24
26Y2
29
16 Y2
19
19
21 %
21 Y2
24
24
26Y2
26%
29
29
c
30
32%
35
37Yz
40
42
45
47Y2
60
52%
55
W
21
26
31
36
41
46
51
56
61
66
71
76
81
86
91
96
101
106
111
Draft Hood
Outlet(s)
Number & Size
1-10"
1-12"
1-12"
1-12"
1-14"
1-14"
1-16"
1-16"
1-16"
2-12"
1-12"/1-14"
2-14"
2-14"
2-14"
1-14"/1 -16"
2-16"
2-16"
2-16"
2-16"
116
2-16"
NOTES:
1. For LGB 4-23- return tapping size is 5" (qty. 2) and supply
tapping size is 6" (qty. 2).
2. Gas trains on aiiiRI boilers and LGB 21-23 for CSD-1 & FM
are located outside the boiler jacket. Allow additional
clearances as required.
Control Tapping Table
Size
Location
Left I Right
End
End
C1
C2
01 &02
E1 & E2
E1
I
Water (Note 4)
Steam
1-1/4" I
1/2" I
Boiler Drain
Limit Control (Note 2)
& Pressure Guage
F1
1"
F2
3/4''
G2
G1
H1 &H2
3/8"
H3&H4
(Note 1)
(Note 1)
2"
J1
J2
1/2"
K1
K2
M1 & M2 I M3&M4 I 1"
I M3
I 1"
M1
I -
To Expansion Tank or Automatic Air Vent (Note 2)
I Operating Control (Note 2)
I -
Tri-cock
Steam Relief Valve & SkimTapping
I Optional Low Water Cutoff (Note 3) I
Firing Rate Control (when used)
I
NOTES:
1. Available on special request only.
2. Must be on same side as supply to system.
Boiler
Model
I
LGB-4
LGB-5
LGB-6
LGB-7
LGB-8
LGB-9
LGB-10
LGB-11
LGB-12
LGB-13
LGB-14
LGB-15
LGB-16
LGB-17
LGB-18
LGB-191
LGB-20-1
No. of
Gas Trains
3. Must be on same side as steam equalizer piping.
4. Additional controls for water boilers may be placed in supply piping.
Standard A.GA
5"We.
?"We.
1
1
1"
1"
1-1/4''
1-1/4"
1-114"
1-1 I4"
1-112"
2"
2"
1-1 14"
1-1 14"
1-1 14"
1-114"
1
1
1
1
1
1
1
2
2
2
Water Relief Valve and Skim Tapping
Combination Pressure & Temperature Guage (Note 2)
Optional Low Water Cutoff
Firing Rate Control (When Used) or
Probe Low Water Cutoff
No. of
Gas Trains I
I
1"
1"
1
1''
1
1"
1"
1"
1-1 14"
1-1I4''
1-1 14"
1"
1"
1"
1"
1"
1-1 14" I 1"
1-1 /4''
1-1/4"
eSD-1 & FM
I ?"We.
5"We.
1"
1-1/4"
1-1/4"
1-114"
1-114"
1-112"
2"
2"
1-114"
1-1 14"
1-1 14"
1-114"
1
2
2
2
I
1"
1"
1"
1"
1"
1-1 I4"
1-1 14"
1-1 14"
1"
1"
1
1
1
1
1
1
1
1
1
1
1
1"
I
1"
1"
1-1 12" /1-11 4"
1-1/2" 11-114" 1-1 14" I 1"
I
I
I 1-1/4"
I
2
2
1-1/2''
1-1 12"
I
2
2"
1-112" 12"
1-1/2" /2" I
I
LGB-211
2"
3"
2"
2
LGB-22
2"
3"
2"
LGB-231
2"
3"
2"
2
NOTES: 1. Rated pressure for LGB 21-23 eS0-1 & FM is 5.5" W.e.
I
No. of
IRI
I Gas Trains I 5.5" we.
I
I
I 1-1/4"
1
1-1/4''
1-1/4"
1-112"
2"
2"
2"
2"
2"
2"
2"
2"
r
we.
1"
1''
1"
1-1 14"
1-1 /4"
1-1 14"
1-1/2"
1-1 12"
1-1 12"
1-1/2"
1-112"
1-112"
I
I
1
1
1
3"
3"
2"
2"
2"
2"
2"
Ratings
I Boiler Water Content Gallons I
Net I=B=R Ratings (3)
Model
(Note 1)
LGB-4
LGB-5
LGB-6
LGB-7
LGB-8
LGB-9
LGB-10
LGB-11
LGB-12
LGB-13
LGB-14
LGB-15
LGB-16
LGB-17
LGB-18
LGB-19
LGB-20
LGB-21
LGB-22
LGB-23
I A.G.A. Input I
MBH (2)
400
520
650
780
910
1,040
1,170
1,300
1,430
1,560
1,690
1,820
1,950
2,080
2,210
2,340
2,470
2,600
2,730
2,860
A.GA
Gross Output
MBH(2)
Steam
MBH (2)
324
I 421
I 527
I 632
I 737
I 842
948
1,053
1,158
1,264
1,369
1,474
1,580
1,685
1,790
1,895
2,001
243
316
395
474
553
632
711
790
869
949
1,035
2~06
2,211
2,317
1~23
1,211
1,298
1,386
1,470
1,553
1,635
1,717
1,799
l
Steam
Sq. Ft.
1,013
1,317
1,645
1,975
2,304
2,633
2,965
3,292
3,621
3,954
4,313
4,679
5,046
5,408
5,775
6,125
6,471
6,813
7,155
7,496
I
Water
MBH (2)
Boiler
Steam
(to Waterline)
Water
H.P.
282
366
458
549
641
733
824
916
1,007
1,099
1,190
1,282
1,373
1,465
1,557
1,648
1,740
1,831
1,923
2,014
9.7
12.6
15.7
18.9
22
25.2
28.3
31.5
34.6
37.8
40.9
44
47.2
50.3
53.5
56.6
59.8
62.9
66.1
69.2
23.2
28.9
34.6
40.3
46.0
51.9
57.6
63.4
69.1
74.9
80.7
86.4
92.2
98.0
103.6
109.5
115.3
121.0
126.8
132.5
36.5
45.6
54.7
63.9
73.0
82.1
91.2
100.4
109.5
118.6
127.7
136.9
146.0
155.1
164.2
173.4
182.5
191.6
201.2
209.8
Approx.
Vent Breaching
Shipping
Inches 1.0. Chimney
Weight (Lbs) Diameteror Equivalent (4)
1,185
1,455
1,725
2,005
2,290
2,560
2,800
3~05
3,365
3,785
4,085
4,355
4,725
4,975
5,270
5,540
5,820
6,080
6,365
6,625
10
12
12
12
14
14
16
16
16
16
16
16
17
17
18
18
19
19
19
20
Notes:
(1) Add to boiler model "-S" forSteam, "-W" forWater.
For LGB 4-14 only: add prefix ''A-" to designator for factory-assembled sections (example: A-LGB-4). Add prefix "P-" to designator for fire-tested
packaged unit (example: P-LGB-4). Note: IRI gas trains for LGB 5-14 are removed for shipping.
(2) MBH refers to thousands of Btu per hoUr.
(3) Net I=B=R ratings are based on net installed radiation of sufficient quantity for the requirement of the building and nothing need be added for
normal piping and pick-up. Water ratings are based on a piping and pick-up allowance of t15. Steam ratings based on the following allowances:
LGB 4 -12 -1.33; LGB-13 - 1.332; LGB-14 - 1.322; LGB-15 - 1.312; LGB-16 - 1.304; LGB-17- 1.297; LGB-18 - 1.292; LGB-19 -1.289; LGB 20-23 -1.288.
An additional allowance should be made for gravity hot water systems or unusual piping and pick-up loads. Ratings shown are for elevations up to
2,000 feet For elevations above 2,000 fee~ reduce ratings at the rate of 4%for each 1,000 feet above sea level.
(4) 20' chimney height may be used based on using a6' length of connector for breaching ofthe size shown from the nearest draft hood outletto the
chimney or vent with not more than one standard sloping-type 90° elbow If Individual vertical vents are to beused,each vent diameter should be
the same size as the respective draft hood outlet and the height may be reduced to 5ft measured above the draft hood outlet.
NOTE: water boilers tested at 80 psi mrking pressure.
Inthe interest of continual improvements inproduct and performance, Weii-Mclain reserves the right to change specificationswithout notice.
~ WEII·mclAIN
C-805 (1111 )
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