Weil-McLain LGB User manual
LGB
Boiler Manual
s)NSTALLATION
s3TARTUP
s-AINTENANCE
s0ARTS
Series 2
Gas–Fired Boiler
Refer to
Control Supplement
for additional information
Read all instructions before installing
Installer Leave all instructions with boiler for future reference.
Any claims for damage or shortage in shipment must be filed immediately
against the transportation company by the consignee.
Owner Installation and service should be performed by qualified contractor.
Part No. 550-141-186/0914
Part Number 550-141-186/0914
2
LGB
3ERIES'AS&IRED"OILER"OILER-ANUAL
Do not use petroleum-based cleaning or sealing compounds in boiler
system. Severe damage to system components can result,causing substantial
property damage.
Read all instructions before installing. Failure to follow all instructions in
proper order can cause severe personal injury, death or substantial property
damage.
Hazard
The following defined terms are used throughout this manual to bring attention to the presence
of hazards of various risk levels, or to important information concerning the life of the product.
Indicates presence of hazards that will cause severe personal injury, death
or substantial property damage.
Indicates presence of hazards that can cause severe personal injury, death
or substantial property damage.
Indicates presence of hazards that will or can cause minor personal injury
or property damage.
Indicates special instructions on installation, operation or maintenance
that are important but not related to personal injury or property damage.
When calling or writing about the boiler— Please have the boiler model
number from the boiler rating label and the CP number from the boiler
jacket.You may list the CP number in the space provided on the Installation
and service certificate found on page 27.
The boiler contains ceramic fiber and fiberglass materials. Use care when
handling these materials per instructions on page 28 of this manual. Failure
to comply could result in severe personal injury.
Glycol — potential fire hazard —
All glycol is flammable when exposed to high temperatures. If glycol is
allowed to accumulate in or around the boiler or any other potential ignition
source,a fire can develop.In order to prevent potential severe personal injury,
death or substantial property damage from fire and/or structural damage:
s .EVERSTOREGLYCOLOFANYKINDNEARTHEBOILERORANYPOTENTIALIGNITION
source.
s -ONITORANDINSPECTTHESYSTEMANDBOILERREGULARLYFORLEAKAGE2EPAIR
any leaks immediately to prevent possible accumulation of glycol.
s .EVERUSEAUTOMOTIVEANTIFREEZEORETHYLENEGLYCOLINTHESYSTEM5SING
these glycols can lead to hazardous leakage of glycol in the boiler system.
Part Number 550-141-186/0914 3
s)NSTALLATIONs3TART5Ps-AINTENANCEs0ARTS
Codes.......................................................................................... 4
Air openings............................................................................... 4
Venting ....................................................................................... 6
Foundation ................................................................................. 8
Base ........................................................................................... 9
Sections.................................................................................... 10
Hydrostatic pressure test......................................................... 12
Cleanout plates ........................................................................ 14
Flue collector hood .................................................................. 15
Water boilers............................................................................ 16
Steam boilers ........................................................................... 18
Multiple steam boilers ............................................................. 20
............................................................................................... 21
....................................................................................... 21
...................................................................... 22
Water boilers............................................................................ 24
Steam boilers ........................................................................... 25
............................................................. 26
! ...................................................................... 27
".................................................................................... 28
#.......................................................................... 32
...................................................................................... 34
$%&and............................................ 35
#............................................................................................. 36
' ...............................................(See Control Supplement)
( ......................................................(See Control Supplement)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Contents
Part Number 550-141-186/0914
4
LGB
3ERIES'AS&IRED"OILER"OILER-ANUAL
)NSTALLATIONSMUSTCOMPLYWITHALLLOCALCODESLAWSREGULATIONSANDORDINANCESALSO.ATIONAL
&UEL'AS #ODE!.3):nLATEST EDITION7HENREQUIRED INSTALLATIONSMUSTCONFORMTO
3TANDARDFOR#ONTROLSAND3AFETY$EVICESFOR!UTOMATICALLY&IRED"OILERS!.3)!3-%#3$
Safe lighting and other performance criteria were met with the gas manifold and control
ASSEMBLYPROVIDEDON BOILER WHENBOILERUNDERWENTTESTSSPECIlEDIN!.3):nLATEST
edition.
#ANADIANINSTALLATIONSMUSTCOMPLYWITH#!.#3!"OR")NSTALLATION#ODE4HE
EQUIPMENTSHALLBEINSTALLEDINACCORDANCEWITHTHOSEINSTALLATIONREGULATIONSINFORCEINTHE
local area where the installation is to be made. These shall be carefully followed in all cases.
Authorities having jurisdiction shall be consulted before installations are made.
!
!
)
Combustion air and ventilation openings must comply with Section 5.3,Air for Combustion and
6ENTILATIONOF.ATIONAL&UEL'AS#ODE!.3):nLATESTEDITIONORAPPLICABLELOCALBUILDING
CODES#ANADIANINSTALLATIONSMUSTCOMPLYWITH#!.#3!"OR")NSTALLATION#ODE
Boiler installation must assure sufficient openings in building and boiler room to provide
ADEQUATECOMBUSTIONAIRANDVENTILATION#ONSIDERCONSTRUCTIONTIGHTNESSOFBUILDINGWHEN
deciding whether additional outside openings may be needed.
Older buildings with single-pane window, minimal weather-stripping and no vapor barrier
often provide enough natural infiltration and ventilation without dedicated openings.
.EWCONSTRUCTIONORREMODELEDBUILDINGSAREMOSTOFTENBUILTTIGHTER7INDOWSANDDOORSARE
weather-stripped, vapor barriers are used and openings in walls are caulked. As a result, such
tight construction is unlikely to allow proper natural air infiltration and ventilation.
Air from inside building (boiler in interior room):
Air openings
Pre-installation — air openings
1a
!DEQUATECOMBUSTIONAIRANDVENTILATIONOPENINGSMUSTBEPROVIDEDTO
assure proper combustion, prevent possibility of flue gas spillage and carbon
monoxide emissions, causing severe personal injury or death.
*
Boiler room
below grade
+
Boiler room
partially or
completely
above grade
Part Number 550-141-186/0914 5
s)NSTALLATIONs3TART5Ps-AINTENANCEs0ARTS
!
)
(continued)
s 4IGHTLYCONSTRUCTEDBUILDINGSMUSTBEPROVIDEDWITHOPENINGSTOOUTSIDEFORCOMBUSTION
and ventilation air. These openings must be sized to handle all fuel-burning appliances,
exhaust and ventilation fans and fireplaces.
s 7HENOPENINGSTOBOILERROOMARETAKENTOINTERIORSPACESPROVIDETWOPERMANENTOPEN-
INGSACOMBUSTIONAIROPENINGWITHININCHESOFmOORANDAVENTILATIONOPENINGWITHIN
INCHESOFCEILING%ACHOPENINGMUSTPROVIDEAMINIMUMFREEAREAOFONESQUAREINCH
PER"TUHINPUTOFALLAPPLIANCESINROOMPLUSREQUIREMENTSFORANYEXHAUSTFANSIN
ROOM4HEINTERIORSPACESUPPLYINGCOMBUSTIONANDVENTILATIONAIRMUSTHAVEADEQUATE
infiltration from outside.
Air directly from outside to boiler room:
s 4IGHTLYCONSTRUCTED BUILDINGS MUSTBE PROVIDEDWITHCOMBUSTION AIR AND VENTILATION
OPENINGSTOBOILERROOMWHICHAREADEQUATETOHANDLETHEBOILERNEEDSPLUSTHENEEDSOF
all other fuel-burning appliances, fireplaces and exhaust or ventilation fans.
s #OMBUSTIONANDVENTILATIONOPENINGSCONNECTINGDIRECTLYORBYDUCTINGTOOUTSIDEORTO
attic or crawl spaces that freely connect with outside, must be sized as follows:
/UTSIDEWALLORVERTICALDUCTINGONESQUAREINCHPER"TUHINPUTOFALLAPPLI-
ANCESINROOMPLUSREQUIREMENTSFORANYEXHAUSTFANSOROTHERAPPLIANCESINROOM
(ORIZONTALDUCTINGONESQUAREINCHPER"TUHOFALLAPPLIANCESINROOMPLUS
REQUIREMENTSFORANYEXHAUSTFANSOROTHERAPPLIANCESINROOM
!LLDUCTINGMUSTBESAMESIZEASPERMANENTOPENINGS-INIMUMAREADIMENSIONSOF
DUCTINGMUSTBENOLESSTHANSQUAREINCHES
4. Other size ducting must comply with local codes.
Compensate for louver blockage when calculating combustion air and ventilation openings.
See Figures 1 and 2. Refer to manufacturer’s instructions for sizing.
Adjustable louvers must be locked open and combustion air damper must interlock with boiler
controls to open automatically before boiler operation.
Part Number 550-141-186/0914
6
LGB
3ERIES'AS&IRED"OILER"OILER-ANUAL
!,
()
)
6ENTINGMUSTBEINSTALLEDACCORDINGTO0ART6ENTINGOF%QUIPMENTOF.ATIONAL&UEL'AS
#ODE!.3):nLATESTEDITIONANDAPPLICABLEBUILDINGCODES#ANADIANINSTALLATIONSMUST
COMPLYWITH#!.#3!"OR")NSTALLATION#ODE
Breeching must not be connected to any portion of mechanical draft system that can operate
under positive pressure.
At the time of removal of an existing boiler, the following steps shall be followed with each
appliance remaining connected to the common venting system placed in operation, while the
other appliances remaining connected to the common venting system are not in operation.
a. Seal any unused openings in the common venting system.
b. Visually inspect the venting system for proper size and horizontal pitch and determine
there is no blockage or restriction, leakage, corrosion and other deficiencies which could
cause an unsafe condition.
c. Insofar as is practical, close all building doors and windows and all doors between the space
in which the appliances remaining connected to the common venting system are located
and other spaces of the building. Turn on clothes dryers and any appliance not connected to
the common venting system. Turn on any exhaust fans, such as range hoods and bathroom
exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan.
Close fireplace dampers.
d. Place in operation the appliance being inspected. Follow the lighting instructions. Adjust
thermostat so appliance will operate continuously.
e. Test for spillage at the draft hood relief opening after 5 minutes of main burner operation.
Use the flame of a match or candle.
f. After it has been determined that each appliance remaining connected to the common vent-
ing system properly vents when tested as outlined above, return doors, windows, exhaust
fans, fireplace dampers, and any other gas-burning appliance to their previous conditions
of use.
g. Any improper operation of the common venting system should be corrected so the instal-
LATIONCONFORMSTOTHE.ATIONAL&UEL'AS#ODE!.3):nLATESTEDITION7HENRESIZING
any portion of the common venting system, the common venting system should be resized
to approach the minimum size as determined using the appropriate tables in Appendix G
INTHE.ATIONAL&UEL'AS#ODE!.3):nLATESTEDITION
#ANADIANINSTALLATIONSMUSTCOMPLYTO#!.#3!"OR")NSTALLATION#ODES
Flue gas spillage
1b Pre-installation — venting
See Figures 3, 4 and 5ONPAGEFORTYPICALVENTINGCONlGURATIONS%NSURETHATYOURINSTALLATION
COMPLIESWITHTHEREQUIREMENTSGIVENINTHESEILLUSTRATIONSANDWITHALLLOCALCODESANDSTANDARDS
See the Ratings table on page 36, for minimum breeching diameter. Use heavy gauge steel
breeching (Type B vent material or single wall metal pipe). Where horizontal breeching is
used, slope upward at least ¼” per foot toward chimney or vent and support with hangers to
prevent sagging.
Long horizontal breechings, excessive numbers of elbows or tees, or other
obstructions restricting flow of combustion gases can result in possibility
of flue gas spillage and carbon monoxide emissions,causing severe personal
injury or death.
Failure to follow all instructions listed below can cause flue spillage and
carbon monoxide emissions, resulting in severe personal injury, death or
substantial property damage.
-
Individual
stub vents
/
Combined
vents
0
Offset
vents
Part Number 550-141-186/0914 7
s)NSTALLATIONs3TART5Ps-AINTENANCEs0ARTS
Notes
-INIMUMVENTHEIGHTUSINGFULLSIZECONNECTOR
2. -INIMUMFEETABOVEANY STRUCTURE WITHIN
FEET
3. Vent and combined vent materials, length
and diameter must be determined using the
COMBINEDVENTINGTABLESOFTHE.ATIONAL&UEL
'AS#ODE!.3):nLATESTEDITIONOROTHER
accepted engineering design method. Use a
connector rise as high as possible to improve
vent connector capacity.
4. Vent and vent connector material and design
must be determined using the individual
VENTINGTABLESOFTHE.ATIONAL&UEL'AS#ODE
!.3):nLATESTEDITIONOROTHERACCEPTED
engineering design method. Use a connector
rise as high as possible to improve vent con-
nector capacity.
1
Foundation
Part Number 550-141-186/0914
8
LGB
3ERIES'AS&IRED"OILER"OILER-ANUAL
1c Pre-installation — foundation
Suggested minimum clearances for servicing:
s INCHESFORACCESSTOCONTROLSANDCOMPONENTSFRONTANDSIDES
s INCHESFROMDRAFTHOODTOWALLFORCLEANINGmUEWAYS
2EQUIREDCLEARANCESINCONlNEDSPACES
s 6ENTPIPEMUSTBEATLEASTINCHESFROMCOMBUSTIBLEMATERIAL
s -INIMUMvBETWEENJACKETANDCOMBUSTIBLEWALLSANDCEILING
&OR,'" THROUGH ,'" )2)AND,'"THROUGH,'" &-#3$ THEGASTRAINIS
located outside the boiler. Provide additional clearance.
Install in a space large in comparison to size of boiler.
Level concrete or brick foundation, minimum 2” thick, (Figure 6ISREQUIREDIF
s 4HEREISAPOSSIBILITYOFTHEmOORBECOMINGmOODED
s .ONLEVELCONDITIONSEXIST
Use foundation with airways when concrete floor is “green”.
&IREHAZARD.EVERINSTALLBOILERONCOMBUSTIBLEmOORINGORCARPETINGEVEN
if a concrete or aerated foundation is used. Severe personal injury, death or
substantial property damage can result.
Do not route wiring, telephone cables or piping in the floor below the
boiler. Overheating could occur, resulting in severe personal injury, death
or substantial property damage.
2
Consider all connections to the boiler before selecting a location.
Boiler must be installed so gas control system components are protected from dripping or
spraying water or rain during operation or service.
Flammable materials To avoid personal injury, death or property damage, keep the boiler area
clear and free from combustible materials, gasoline and other flammable
VAPORSANDLIQUIDS
Boiler
Model
Number
“W”
Inches
LGB-4 21
LGB-5 26
LGB-6 31
LGB-7 36
LGB-8 41
LGB-9 46
LGB-10 51
LGB-11 56
LGB-12 61
LGB-13 66
Boiler
Model
Number
“W”
Inches
LGB-14 71
LGB-15 76
LGB-16 81
LGB-17 86
LGB-18 91
LGB-19 96
LGB-20 101
LGB-21 108
LGB-22 111
LGB-23 116
3
Base
assembly
4
Access shield
(sizes D,
E, F and G
shown)
Part Number 550-141-186/0914
s)NSTALLATIONs3TART5Ps-AINTENANCEs0ARTS
Check for proper orifice size:
s .ATURALGASnMM
s 0ROPANEGASnMM
Assembly order
Burner seating
Before assembling base, relocate access shield from lower shipping holes to upper mounting holes. See Figure 7.
s "ASESIZES!"AND#ONEMOUNTINGHOLE
s "ASESIZES$%&AND'TWOMOUNTINGHOLES
Proper orifices must be used. Failure to do so will cause severe personal injury, death or sub-
stantial property damage.
Assemble base(s) as shown in Figure 8, in the order shown in the table below. Dual base shown.
Level and straighten burners to avoid misfiring.
Base assembly must be located in order shown in Base Arrangement Table, below, so flue
collector/draft hoods, jackets, and gas controls are installed in correct position.
Burners must be properly seated in their locating slots with openings facing up. Front of
burners must rest fully over main burner orifices. Gas orifices must inject down center of
burners. Failure to properly level and seat burners will result in severe personal injury, death
or substantial property damage.
2a Boiler assembly — base
The boiler contains ceramic fiber and fiberglass materials. Use care when handling these materials
per instructions on page 28 of this manual. Failure to comply could result in severe personal injury.
Base Arrangement Table (Note 1)
Boiler
Model
Number
Base Size Boiler
Model
Number
Base Size
LGB-4 4 --- LGB-14 CB
LGB-5 5 --- LGB-15 CC
LGB-6 A --- LGB-16 DC
LGB-7 B --- LGB-17 DD
LGB-8 C --- LGB-18 ED
LGB-9 D --- LGB-19 EE
LGB-10 E --- LGB-20 FE
LGB-11 F --- LGB-21 FF
LGB-12 G --- LGB-22 GF
LGB-13 BB LGB-23 GG
Note 1: From boiler left side (front view). Side panels
shipped in separate carton.
For dual
base only
where two base connect.
For dual
b
ase on
l
y
w
h
ere t
w
5
Sealing rope, seals, and draw
rod tightening sequence
2b Boiler assembly — sections
Part Number 550-141-186/0914
LGB
3ERIES'AS&IRED"OILER"OILER-ANUAL
Assembly may start at either end section.
For easier assembly start with right end section.
0OSITIONRIGHTENDSECTIONmUSHWITHRIGHTENDOFBASE3EEFigure 13ONPAGE
2
2. With caulking gun,apply
/
8”continuous bead of sealing rope adhesive in sealing grooves.
See Figure 9.
0LACEvROPEINGROOVE!ROUNDCURVESGRASPATvINTERVALSANDPUSHTOGETHER$O
not stretch. Cut rope as each section is completed. See Figure 9.
2EMOVEANYGRITFROMPORTOPENINGSEALINGSURFACESWITHCLEANRAG.OTEWarning below.
5. Place sealing rings in port openings. See Figure 9.
Clean port
sealing surfaces Remove all grit or rust from port opening sealing surfaces. Failure to do
so may cause a seal failure, resulting in severe personal injury, death or
substantial property damage.
No petroleum-
based chemicals $ONOTUSEANYCLEANERCONTAININGPETROLEUMBASEDDISTILLATEOIL%LASTOMER
seal failure will occur, causing substantial property damage.
Do not precut
rope Do not precut rope. Gas tight seal must be maintained to prevent possibil-
ity of flue gas spillage and carbon monoxide emissions, causing personal
injury or death.
Sections are
top-heavy Sections are top heavy and will not stand individually without support.
Severe personal injury, death or substantial property damage can result.
6. Prepare intermediate section:
A 2EMOVEGRITORRUSTFROMPORTOPENINGSEALINGSURFACES.OTEWarning above.
b. Position intermediate sections so alignment lugs fit into sockets of next section.
Refer to Figure 10PAGE
7. Discard
3
/8” diameter shipping tie rods. Do not use to draw sections together.
First draw rod
Second draw rod
Third draw rod
Part Number 550-141-186/0914
s)NSTALLATIONs3TART5Ps-AINTENANCEs0ARTS
2
(continued)
*6
Sealing ring installation and
port alignment
8. Place all sections on base assembly insuring sections are straight and properly aligned
with alignment lugs. Snug the lower front and rear draw rods on every section. Do
not tighten front upper draw rods. Front upper draw rods must remain loose until
LOWERFRONTANDREARDRAWRODSARETIGHTENEDTOPROPERTORQUE3EEFigure 10.
a. Oil threads on all draw rods. Install washer and nut on end to be tightened. Use
nut only on other end.
b. Uniformly draw sections together, starting at washer/nut end. Tighten lower front
and rear draw rods uniformly and progress through every section to the end.
.OTE!SSTATEDEARLIERUPPERFRONTDRAWRODNUTSSHOULDREMAINLOOSEUNTILLOWER
FRONTANDREARDRAWRODSARETIGHTENEDTOPROPERTORQUE
C $RAWRODSSHOULDBETORQUEDTOARANGEOFFTLBSINSEQUENCESHOWNIN
&IGURE(OWEVERDONOTTIGHTENTHETHIRDUPPERFRONTDRAWRODUNTILALLLOWER
FRONTANDREARDRAWRODSARETIGHTENEDSEQUENTIALLYTOPROPERTORQUE$ONOTBACK
off draw rods once they are tightened.
D -ETALTOMETALCONTACTWILLBEACHIEVEDAROUNDPORTOPENING3EEFigure 10. If a
GAPDOESEXISTITSHOULDBENOGREATERTHANv#HECKWITHFEELERGAUGE
e. Tighten third, upper front draw rod just enough to get good even compression on
the rope.
&OLLOWSTEPSTHROUGHFORREMAININGINTERMEDIATESANDLEFTENDSECTION
Check sealing
rope Check sealing rope of each section before proceeding to next section. Boiler
must be sealed gas-tight to prevent possibility of flue gas spillage and carbon
monoxide emissions, causing severe personal injury or death.
End section
must be plumb %NDSECTIONMUSTBEPLUMB!FTERERECTINGSTINTERMEDIATESECTIONCHECK
both sections for plumb. Failure to plumb sections may cause misaligned
piping and breeching, resulting in minor property damage.
Verify metal to
metal contact
at ports
)FFORANYREASONGAPAROUNDPORTOPENINGEXCEEDSvCHECKFORROPE
extending from rope grooves, dirt on port openings or sockets, or misaligned
LUGS)FCORRECTIONSAREMADEANDGAPSTILLEXISTSCONTACTYOUR7EIL-C,AIN
distributor or sales office before continuing installation. Failure to correct
this situation could cause seal failure, resulting in severe personal injury,
death or substantial property damage.
Part Number 550-141-186/0914
LGB
3ERIES'AS&IRED"OILER"OILER-ANUAL
7
Pressure test before connecting gas piping and electrical supply.
Refer to Figures 11a and 11b for control tapping locations. Install:
a. Boiler drain (not supplied).
b. Water pressure gauge — for test only. Be sure gauge can handle test pressures. See
Step 3.
2. Plug remaining tappings.
**
Left end section tappings
2c Boiler assembly — pressure test
&ILLBOILER6ENTALLAIR&ORMORETHANMINUTESPRESSURETEST
a. Steam boilers between 45 - 55 psig.
B 7ATERBOILERSTIMESMAXIMUMWORKINGPRESSURESTATEDONCASTINGSANDBOILER
nameplate.
No controls
installed DO NOT pressure test with any controls installed. Damage to control can
occur.
Do not
leave boiler
unattended
Do not leave boiler unattended. Cold water fill could expand and cause
excess pressure, resulting in severe personal injury, death or substantial
property damage.
Tapping Size
Inches
Steam Boilers Water Boilers
(note 4)
C1 1
1
/
4
Boiler drain Boiler drain
D1 & D2
1
/
2
Gauge glass
(note 3)
--
E1 & E2 1Low water cutoff
(note 3)
Optional low water
cutoff
E1 1Pressure
operating & limit
controls and
pressure gauge
Limit control
(note 2)
F1 1 -- To expansion tank or
automatic air vent
(note 2)
G1
3
/
4
-- Operating control
(note 2)
H1 & H2
(note 1)
3
/
8
Tri-cock --
J1 2Steam relief valve
& skim tapping
Water relief valve &
skim tapping
K1
1
/
2
-- Combination pressure
& temperature gauge
(note 2)
M1 & M2 1Optional low water
cutoff (note 3)
Optional low water
cutoff
M1 1Firing rate control
(when used)
Firing rate control
(when used) or Probe
low water cutoff
Notes:
1. Available on special request only.
2. Must be on same side as supply to system.
3. Must be on same side as steam equalizer piping.
4. Additional controls for water boilers may be placed in supply piping.
Part Number 550-141-186/0914
s)NSTALLATIONs3TART5Ps-AINTENANCEs0ARTS
**
Right end section tappings
7
(continued)
No petroleum-
based chemicals
4. Check for maintained gauge pressure and leaks. Repair if found.
5. Drain boiler and remove plugs from tappings used for controls and accessories.
Do not use petroleum-based cleaning or sealing compounds in boiler system.
Severe damage to boiler will result, causing substantial property damage.
Repair leaks
at once Leaks must be repaired at once.Failure to do so can damage boiler, resulting
in substantial property damage.
Tapping Size
Inches
Steam Boilers Water Boilers
(note 4)
C2 11
/
4Boiler drain Boiler drain
D3 & D4 1
/
2
Gauge glass
(note 3)
--
E3 & E4 1Low water cutoff
(note 3)
Optional low water
cutoff
E3 1Pressure
operating & limit
controls and
pressure gauge
Limit control
(note 2)
F2 1 -- To expansion tank or
automatic air vent
(note 2)
G2 3
/
4-- Operating control
(note 2)
H3 & H4
(note 1)
3
/
8Tri-cock --
J2 2Steam relief valve
& skim tapping
Water relief valve &
skim tapping
K2 1
/
2-- Combination pressure
& temperature gauge
(note 2)
M3 & M4 1Optional low water
cutoff (note 3)
Optional low water
cutoff
M3 1Firing rate control
(when used)
Firing rate control
(when used) or Probe
low water cutoff
Notes:
1. Available on special request only.
2. Must be on same side as supply to system.
3. Must be on same side as steam equalizer piping.
4. Additional controls for water boilers may be placed in supply piping.
Part Number 550-141-186/0914
LGB
3ERIES'AS&IRED"OILER"OILER-ANUAL
! Assemble cleanout plates to section assembly as shown in Figure 12.
Gas-tight seal Cleanout plates must be sealed gas-tight to prevent possibility of flue gas
spillage and carbon monoxide emissions, causing severe personal injury or
death.
The boiler contains ceramic fiber and fiberglass materials. Use care when
handling these materials per instructions on page 28 of this manual. Failure
to comply could result in severe personal injury.
*+
Cleanout plate assembly
2d Boiler assembly — cleanout plates
Boiler Model
Number
Flue Collector Hood(s)
(from left side of boiler)
LGB-4 4 ---
LGB-5 5 ---
LGB-6 A ---
LGB-7 B ---
LGB-8 C ---
LGB-9 D ---
LGB-10 E ---
LGB-11 F ---
LGB-12 G ---
LGB-13 BB
LGB-14 CB
LGB-15 CC
LGB-16 DC
LGB-17 DD
LGB-18 ED
LGB-19 EE
LGB-20 FE
LGB-21 FF
LGB-22 GF
LGB-23 GG
Part Number 550-141-186/0914
s)NSTALLATIONs3TART5Ps-AINTENANCEs0ARTS
See Figure 13 — single base shown.
Refer to the table below, for proper arrangement.
!SSEMBLEBOLTWASHERANDNUTTOSECTIONJOINT
2. Apply retort cement for gas-tight seal.
*-
Flue collector hood assembly and sealing the boiler
Gas-tight seal
2e
Hood must be sealed gas-tight to prevent possibility of flue gas spillage and
carbon monoxide emissions, causing severe personal injury or death.
-OUNTHOODONSECTIONASSEMBLY&ASTENWITHWASHERSANDNUTS
Apply retort cement between bottom of sections and top of base assembly. See Figure 13.
Sealing the
boiler Boiler must be sealed gas-tight to prevent possibility of flue gas spillage and
carbon monoxide emissions, causing severe personal injury or death.
Part Number 550-141-186/0914
LGB
3ERIES'AS&IRED"OILER"OILER-ANUAL
)NSTALLSYSTEMSUPPLYANDRETURNPIPINGBEFOREERECTINGJACKETORINSTALL-
ing controls.
2. Do not pipe in through supply and out through return. This creates
reverse water flow that must not be used.
%XPANSIONTANK
A #LOSEDTYPEEXPANSIONTANKCONNECTTOvTAPPINGhF”(refer to Ta p -
ping tablesPAGESAND5SEv.04PIPING!NYHORIZONTAL
PIPINGMUSTPITCHUPWARDTOWARDTANKATLEASTINCHFOREACHFEET
of piping. See Figure 14.
b. Diaphragm type expansion tank — locate between supply and inlet
to circulator. Install automatic air vent in tapping “F”.
4. Connect supply and return piping:
a. Size according to tables on this page.
b. Install circulator in supply piping, with the expansion tank
located on the suction side of the circulator.
C )NSTALLSYSTEMDRAINVALVESIZEDPER!3-%#ODE
Models LGB-4 – LGB-12 — use 1” drain valve.
Models LGB-13 – LGB-23 — use 1¼” drain valve.
5. When three-way valves are used for temperature modulation, install
slow-opening valves and boiler mixing pump to minimize potential of
boiler thermal shock. See Weil-McLain Bulletin AE-8402.
-ULTIPLEBOILERSSEEFigure 15PAGE
0IPINGSHOULDBESIZEDFORA&RISETHROUGHTHEBOILER3EETable 1,
below. For higher flow rates (when specified), use pipe sizes no smaller
than those given in Table 2, below.
8*
20°F rise
through
boiler
#
9
3a Piping — water boilers
Improper piping systems and/or undersized piping can contribute to erratic
boiler operation and possible boiler damage. Install piping as shown below.
LGB-4 through LGB-12 only — supply and return piping can be on same
end.
Intermittent flow at higher velocities than shown for pipe size in Table 2,
below, can damage boiler causing substantial property damage.
1-ODELS,'"THROUGH,'"ONLYALTERNATESUPPLYTAPPINGFORSUPPLYANDRETURN
on same end.
2-ODELS,'"THROUGH,'"ONLYALTERNATERETURNTAPPINGFORSUPPLYANDRETURN
on same end.
3Location for closed type expansion tanks only. Locate diaphragm type expansion tanks
between boiler supply connection and circulator suction connection.
:
8+
Boiler
Model
Number
Pipe Size
Supply &
Return
LGB-4 2”
LGB-5 2½”
LGB-6 – LGB-8 3”
LGB-9 – LGB-16 4”
LGB-17 – LGB-23 5”
Water Flow Rate
GPM
Pipe Size
Supply &
Return
Up to 35 2”
36 to 50 2½”
51 to 77 3”
78 to 142 4”
143 to 237 5”
*/
Water boiler
piping
1
2
3
4
5
6
Part Number 550-141-186/0914
s)NSTALLATIONs3TART5Ps-AINTENANCEs0ARTS
;
(systems above 140°F)
7EIL-C,AINRECOMMENDSPIPING
as shown in Figure 15. For single
boilers, pipe as shown for one unit.
3IZESECONDARYBOILERPUMP'0-
FOR&TO&TEMPERATURERISE
through boiler. Secondary boiler
pump head will be very low. Cal-
culate only secondary piping circuit
resistance.Boiler resistance will not
exceed 6” w.c.
0RIMARY PUMP '0-AND HEAD
calculation should not include
secondary boiler circuits. Primary
pump can operate continuously
during heating season.
$ISTANCEvORLESS
Flow/check valve.
Hand valve.
%XPANSIONTANKSRELIEFVALVESAND
OTHERACCESSORIESAREREQUIREDBUT
not shown.
#
The boiler must be installed so that
chilled medium is piped in parallel
with the heating boiler with appro-
priate valves to prevent the chilled
medium from entering the boiler.
See Figure 16. Consult AHRI In-
stallation and Piping Guides.
If boiler is connected to heating
coils located in air handling units
where they can be exposed to
refrigerated air, gravity circula-
tion during cooling cycle must be
prevented with flow control valves
or other automatic means.
*0
*1
Part Number 550-141-186/0914
LGB
3ERIES'AS&IRED"OILER"OILER-ANUAL
Pipe the header at least 24 inches above the boiler water line.
7EIL-C,AINRECOMMENDSUSINGABOILERFEEDSYSTEMWITHTHEPUMPOPERATEDBYALEVELCON-
TROLLERONTHEBOILER7EIL-C,AINDOESNOTRECOMMENDUSINGACONDENSATERETURNSYSTEMON
which the pump is operated by a receiver-mounted float switch. Level controls (Section 6)
MUSTBEMOUNTEDONSAMESIDEOFBOILERASTHERETURNPIPINGANDEQUALIZER
Install a blowdown valve in tapping C1 or C2 (see Figures 11a and 11bPAGESAND
SIZEDPER!3-%#ODE
Models LGB-4 through LGB-12USEvBLOWDOWNVALVE
Models LGB-13 through LGB-23USEvBLOWDOWNVALVE
See Figure 200AGEFORMULTIPLESTEAMBOILERPIPING
*4
Steam boiler piping for
LGB-4 through LGB-12
(single riser)
*3
Steam boiler piping for
LGB-13 through LGB-23
(riser each end)
3b Piping — steam boilers
Improper piping systems and/or undersized piping can contribute to erratic
boiler operation and possible boiler damage. The piping must be installed
as illustrated, using the recommended minimum pipe sizes.
Minimum Recommended Pipe Sizes
Boiler
Model
Number
Riser
A
Header
H
Equalizer
J
LGB-4 ––
LGB-8 4” 4” 2”
LGB-9 ––
LGB-11 5” 5” 2½”
LGB-12 6” 6” 2½”
Minimum Recommended Pipe Sizes
Boiler
Model
Number
Risers
A B
Header
H
Equalizer
J
LGB-13 ––
LGB-15 4” 4” 6” 4”
LGB-16 ––
LGB-19 5” 5” 6” 4”
LGB-20 ––
LGB-23 6” 6” 8” 4”
OR
Reducing from header
to equalizer - alternate
piping methods.
DO NOT reduce the
header in the
horizontal piping.
1
186-17a
2"
Isolation valve
Strainer Feed pump Check valve
Receiver
Return
Vent to atmosphere
Boiler
Hartford loop
186-19
Part Number 550-141-186/0914
s)NSTALLATIONs3TART5Ps-AINTENANCEs0ARTS
!)
3ATISFACTORYOPERATIONOFANYSTEAMHEATINGSYSTEMDEPENDSUPONADEQUATE
return of condensate to maintain steady water level.Avoid adding excessive
AMOUNTOFRAWMAKEUPWATER7HERECONDENSATERETURNISNOTADEQUATEA
low water cutoff and pump control, condensate receiver, and condensate
boiler feed pump should be installed. Refer to Figure 19 for piping and
condensate receiver capacity table for sizing.
*5
Boiler feed pump and
condensate receiver piping
8-
Condensate receiver capacity
(minimum)
Boiler
Model
Number
Gross
Output
Steam
Condensate Minimum Condensate Receiver Capacity
Select minimum receiver capacity based on time
(minutes), required for condensate to return to the
receiver.
Recommended
Feed Pump
Capacity
lbs/hour 15 min 30 min 45 min 60 min GPM @15 PSI
LGB-4 312.0 39 12 23 35 47 1.3
LGB-5 409.2 51 15 30 46 61 1.7
LGB-6 514.2 63 19 38 58 77 2.1
LGB-7 619.3 76 23 46 68 91 2.5
LGB-8 724.4 88 26 52 78 104 2.9
LGB-9 828.9 101 30 60 90 120 3.3
LGB-10 933.7 114 34 68 102 136 3.8
LGB-11 1038.7 126 38 76 114 152 4.2
LGB-12 1144.0 139 42 84 126 168 4.6
LGB-13 1238.6 152 46 92 138 184 5.1
LGB-14 1343.6 164 49 98 147 196 5.5
LGB-15 1448.7 177 53 106 159 212 5.9
LGB-16 1552.2 190 58 116 174 232 6.3
LGB-17 1657.8 202 61 122 183 244 6.7
LGB-18 1763.6 215 65 130 195 260 7.1
LGB-19 1867.3 227 68 136 204 272 7.5
LGB-20 1973.6 240 72 144 216 288 8.0
LGB-21 2077.4 253 76 152 228 304 8.4
LGB-22 2184.0 265 79 158 237 316 8.8
LGB-23 2288.0 278 83 166 249 332 9.2
Part Number 550-141-186/0914
LGB
3ERIES'AS&IRED"OILER"OILER-ANUAL
+6
Piping
multiple
steam boilers
3c Piping — multiple steam boilers
:
1 %ACHBOILERHASABOILERFEEDPUMPCONTROLLERNOTSHOWN,EVELCONTROLS3ECTIONMUSTBEMOUNTEDONSAMESIDEOFBOILERASRETURN
2 -OUNTEACHBOILERFEEDPUMPCONTROLLERWITHBODYMARKATTHELEVELINDICATEDIN4ABLEPAGEAND&IGUREPAGE
3 ,OCATESYSTEMSTEAMSUPPLYTAKEOFFOUTBOARDFROMTHEBOILERCONNECTINGPIPINGASSHOWNTOASSURELIQUIDINLINEWILLmOWTOTRAP
4 Locate combined header drain as shown. Install strainer and float and thermostatic trap in drain line as shown. Pipe trap outlet to condensate
receiver.
5 3IZETHECOMMONHEADERPIPINGPER!3(2!%RECOMMENDATIONSANDINNOCASESMALLERTHANTHEINDIVIDUALBOILERHEADERS
6 Pipe the Hartford Loop tee 4”below boiler waterline.
7 Boiler controls and trim (valves, low water cutoffs,pump controllers, burners, etc.) are omitted in order to emphasize steam and return piping.
8 Provide a separate feed pump for each boiler. Alternatively, provide a separate automatic valve with end switch and a single feed pump. When
valves are used, activate the valve with the boiler pump controller. Activate the feed pump with the valve end switch.
9 -ANUALSTEAMVALVEORSLOWOPENINGAUTOMATICSTEAMVALVESIZEDTOBOILEROUTPUTCAPACITY
10 "OILERSTEAMHEADERFORSINGLEBOILERSEEPAGE
11 )NSTALLAmOATANDTHERMOSTATICTRAPANDSTRAINEROFFTHEEQUALIZEROFEACHBOILERFROMTOINCHESABOVETHEWATERLINE#ONNECTTHETRAP
outlet to the condensate receiver. The trap will prevent an idle boiler from flooding due to condensed steam from the system.
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