Weil-McLain LGB Manual
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Weil-McLain LGB Manual

Series 2 gas–fired boiler
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See also: User's Information Manual
LGB
Boiler Manual
Read all instructions before installing
Leave all instructions with boiler for future reference.
Installer
Any claims for damage or shortage in shipment must be filed immediately
against the transportation company by the consignee.
Installation and service should be performed by qualified contractor.
Owner
Series 2
Gas–Fired Boiler
Control Supplement
for additional information
Part No. 550-141-186/0914
Refer to

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Summary of Contents for Weil-McLain LGB

  • Page 1 Series 2 Gas–Fired Boiler Boiler Manual Refer to Control Supplement for additional information Read all instructions before installing Leave all instructions with boiler for future reference. Installer Any claims for damage or shortage in shipment must be filed immediately against the transportation company by the consignee. Installation and service should be performed by qualified contractor.
  • Page 2 5HDG WKLV SDJH ÀUVW 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. GHÀQLWLRQV Indicates presence of hazards that will cause severe personal injury, death or substantial property damage.

  • Page 3: Table Of Contents

    Contents 3UHLQVWDOODWLRQ Codes ..................4 Air openings ................4 Venting ..................6 Foundation ................. 8 %RLOHU DVVHPEO\ Base ................... 9 Sections ..................10 Hydrostatic pressure test ............12 Cleanout plates ................ 14 Flue collector hood ..............15 3LSLQJ Water boilers ................16 Steam boilers ................

  • Page 4: Codes

    Pre-installation — air openings &RGHV Safe lighting and other performance criteria were met with the gas manifold and control edition. 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. &RPEXVWLRQ DLU Combustion air and ventilation openings must comply with Section 5.3, Air for Combustion and DQG YHQWLODWLRQ...
  • Page 5 &RPEXVWLRQ DLU DQG YHQWLODWLRQ and ventilation air. These openings must be sized to handle all fuel-burning appliances, exhaust and ventilation fans and fireplaces. RSHQLQJV (continued) infiltration from outside. Air directly from outside to boiler room: all other fuel-burning appliances, fireplaces and exhaust or ventilation fans. attic or crawl spaces that freely connect with outside, must be sized as follows: 4.

  • Page 6: Venting

    Pre-installation — venting &KLPQH\ RU 9HQW Breeching must not be connected to any portion of mechanical draft system that can operate under positive pressure. Long horizontal breechings, excessive numbers of elbows or tees, or other Flue gas spillage obstructions restricting flow of combustion gases can result in possibility of flue gas spillage and carbon monoxide emissions, causing severe personal injury or death.
  • Page 7 )LJXUH  )LJXUH  Individual Combined stub vents vents )LJXUH  Offset vents Notes Vent and combined vent materials, length and diameter must be determined using the accepted engineering design method. Use a connector rise as high as possible to improve vent connector capacity.

  • Page 8: Foundation

    Level concrete or brick foundation, minimum 2” thick, ( Figure 6 Use foundation with airways when concrete floor is “green”. )LJXUH  Boiler “W” Boiler “W” Model Model Inches Inches Foundation Number Number LGB-4 LGB-14 LGB-5 LGB-15 LGB-6 LGB-16 LGB-7 LGB-17 LGB-8 LGB-18 LGB-9 LGB-19 LGB-10 LGB-20 LGB-11...

  • Page 9: Base

    Base Arrangement Table (Note 1) )LJXUH  Boiler Base Size Boiler Base Size Model Model Access shield Number Number (sizes D, LGB-4 LGB-14 E, F and G shown) LGB-5 LGB-15 LGB-6 LGB-16 LGB-7 LGB-17 LGB-8 LGB-18 LGB-9...

  • Page 10: Sections

    Boiler assembly — sections 6HFWLRQ DVVHPEO\ Assembly may start at either end section. For easier assembly start with right end section. Figure 13 Sections are top heavy and will not stand individually without support. Sections are top-heavy Severe personal injury, death or substantial property damage can result. 2.
  • Page 11 8. Place all sections on base assembly insuring sections are straight and properly aligned 6HFWLRQ DVVHPEO\ with alignment lugs. Snug the lower front and rear draw rods on every section. Do (continued) not tighten front upper draw rods. Front upper draw rods must remain loose until Figure 10 a.

  • Page 12: Hydrostatic Pressure Test

    Boiler assembly — pressure test +\GURVWDWLF Pressure test before connecting gas piping and electrical supply. SUHVVXUH WHVW Refer to for control tapping locations. Install: Figures 11a and 11b a. Boiler drain (not supplied). b. Water pressure gauge — for test only. Be sure gauge can handle test pressures. See Step 3 2.
  • Page 13 +\GURVWDWLF SUHVVXUH 4. Check for maintained gauge pressure and leaks. Repair if found. WHVW 5. Drain boiler and remove plugs from tappings used for controls and accessories. (continued) Repair leaks Leaks must be repaired at once. Failure to do so can damage boiler, resulting at once in substantial property damage.

  • Page 14: Cleanout Plates

    Boiler assembly — cleanout plates 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. &OHDQRXW SODWHV Assemble cleanout plates to section assembly as shown in Figure 12 Cleanout plates must be sealed gas-tight to prevent possibility of flue gas Gas-tight seal...

  • Page 15: Flue Collector Hood

    Apply retort cement between bottom of sections and top of base assembly. See Figure 13 )LJXUH  Flue collector hood assembly and sealing the boiler Flue Collector Hood(s) Boiler Model Number (from left side of boiler) LGB-4 LGB-5 LGB-6 LGB-7 LGB-8 LGB-9 LGB-10 LGB-11...

  • Page 16: Water Boilers

    Install circulator in supply piping, with the expansion tank located on the suction side of the circulator. 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.
  • Page 17 3ULPDU\VHFRQGDU\ )LJXUH  SLSLQJ as shown in . For single Figure 15 boilers, pipe as shown for one unit. (systems above 140°F) through boiler. Secondary boiler pump head will be very low. Cal- culate only secondary piping circuit resistance. Boiler resistance will not exceed 6”...

  • Page 18: Steam Boilers

    float switch. Level controls ( Section 6 Install a blowdown valve in tapping (see Figures 11a and 11b Models LGB-4 through LGB-12 Models LGB-13 through LGB-23 Figure 20 )LJXUH  Steam boiler piping for...
  • Page 19 Condensate receiver capacity Number Steam (minutes), required for condensate to return to the (minimum) receiver. lbs/hour JDOORQVKRXU 15 min 30 min 45 min 60 min GPM @15 PSI LGB-4 312.0 LGB-5 409.2 LGB-6 514.2 LGB-7 619.3 LGB-8 724.4 LGB-9 828.9 LGB-10 933.7...

  • Page 20: Multiple Steam Boilers

    Piping — multiple steam boilers )LJXUH  Piping multiple steam boilers 1RWHV Locate combined header drain as shown. Install strainer and float and thermostatic trap in drain line as shown. Pipe trap outlet to condensate receiver. Pipe the Hartford Loop tee 4” below boiler waterline. Boiler controls and trim (valves, low water cutoffs, pump controllers, burners, etc.) are omitted in order to emphasize steam and return piping.

  • Page 21: -Dfnhw

    28 to comply could result in severe personal injury. 5HIHU WR VHSDUDWH Refer to separate LGB Jacket erecting instructions packed in Jacket Carton. Boiler must be LQVWUXFWLRQV hydrostatically pressure-tested, plugs for unused tappings installed, and collector hood(s) and cleanout plates in position before attaching jacket.

  • Page 22: ,Qvwdoo Erlohu Frqwurov

    Install boiler controls Failure to properly install, pipe and wire boiler controls may result in severe Controls damage to the boiler, building and personnel. Relief valve stem Install relief valve with spindle in vertical position. Relief valve discharge vertical only piping must be piped near floor close to floor drain to eliminate potential of severe burns.
  • Page 23 )LJXUH  Steam boiler control installation 3ULPDU\ OHYHO FRQWURO SLSLQJ for other controls) FRPSRQHQWV IXUQLVKHG 3LSLQJ IRU EDFNXS FRQWURO E\ RWKHUV included ,QVWDOO µ EORZGRZQ YDOYH LQ ERWWRP RI HDFK FURVV /HYHO FRQWUROV PXVW EH PRXQWHG RQ VDPH VLGH RI ERLOHU DV WKH HTXDOL]HU DQG UHWXUQ SLSLQJ )LJXUH  Steam boiler level control...

  • Page 24: Water Boilers

    Final Adjustments — water boilers :DWHU WUHDWPHQW Do not use petroleum-based cleaning or sealing compounds in boiler system. Severe boiler damage will occur. ing heat transfer, overheating cast iron, and causing section failure. )UHH]H SURWHFWLRQ Do not use automotive, ethylene glycol or undiluted antifreeze. Severe personal injury, death or substantial property damage can result.

  • Page 25: Steam Boilers

    Final Adjustments — steam boilers :DWHU WUHDWPHQW Do not use petroleum-based cleaning or sealing compounds in boiler system. Severe boiler damage will occur. ing heat transfer, overheating cast iron, and causing section failure. )LOOLQJ VWHDP ERLOHUV 2. Fill to normal waterline, halfway up gauge glass. 4.

  • Page 26: 3Odflqj Erlohu Lq Rshudwlrq

    Placing boiler in operation 7R SODFH ERLOHU position or lowest position on dial. Be sure boiler has been LQ RSHUDWLRQ correctly filled with water. 2. Turn electric power. Before lighting pilot lighting to prevent minor personal injury or property damage. 3.

  • Page 27: &KhfnRxw Surfhgxuh

    Check-out procedure — check off steps as completed † † 2. Automatic air vent, if used, open one turn (water boilers only)? † 3. Air purged from system (water boilers only)? † 4. Steam boilers properly skimmed? † 5. Air purged from gas piping? Piping checked for leaks? †...

  • Page 28: 0Dlqwhqdqfh

    0DLQWHQDQFH ³ UHDG WKLV SDJH ÀUVW Also refer to additional instructions shipped with boiler for specific control operation and troubleshooting. service agency. To avoid severe personal injury, death or substantial property damage — before servicing: 2. Shut off gas supply. 3.
  • Page 29 Maintenance — minimum schedule %HJLQQLQJ RI HDFK KHDWLQJ VHDVRQ 2. Check burners and flueways and clean if necessary. Refer to Clean boiler heating surfaces Clean main burners Section 10c 3. Follow procedure, , page 26. Section 8, Placing boiler in operation 4.
  • Page 30 Maintenance — procedures 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. ,QVSHFW EDVH LQVXODWLRQ If base insulation material is damaged or displaced, call service technician immediately.
  • Page 31 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. ,QVSHFW candle or match below lower edge of draft hood “skirt”. If flame does not blow out, but burns YHQWLQJ V\VWHP undisturbed, vent system is functioning properly.

  • Page 32: 5Hsodfhphqw Sduwv

    Replacement parts Base Insulation Table Base Size Base Insulation Size (Note 1) (Note 2) A and K B and K A and J A and J Notes: 1. 6HH SDJH  Base Arrangement Table, to determine base size for your boiler.
  • Page 33 Item Description Size Weil-McLain Item Description Size Weil-McLain Part Number Part Number Horizontal Draft Hood 443-300-098 Base Access Shield 450-003-606 450-003-607 443-300-099 450-003-582 443-300-100 450-003-583 443-300-101 450-003-584 443-300-102 450-003-585 443-300-103 450-003-586 443-300-104 450-003-587 443-300-105 450-003-588 443-300-106 Manifold 591-125-908 Screw, Phillips #10 x1/2...

  • Page 34: 12 'Lphqvlrqv

    Tappings Tappings Natural and Propane (Note 1) Outlet(s) Model Size Size 5" w.c. 7" w.c. Natural Size Number Trains Natural 11"-13" Propane LGB-4 6" 5" (1) 1" 10" (1) 1" LGB-5 6" 5" (1) 1" 12" (1) 1" LGB-6 6"...
  • Page 35 4. Factory Packaged Burner-Base Assembly(ies) 5. Factory Pre-piped Gas Control Assembly(ies) - 24 volt only) 6. Junction Box base) 8. Intermittent Ignition Control System (LGB-4 and LGB-5 only) :DWHU ERLOHUV only) 4. Combination Pressure/Temperature Gauge 7. Wiring Harness/Junction Box and Pre-wired Flexible Conduit 8.

  • Page 36: 5Dwlqjv

    Sq. Ft. Water- Models PLGB Inches Boiler (Note 1) (Note 2) (Note 2) (Note 2) Steam H.P. Gallons lbs. (Note 4) (Note 5) Waterline) LGB-4 Steam 23.2 36.5 1185 1600 LGB-5 Steam 12.6 1279 28.9 45.6 1455 1200 1800 LGB-6 Steam 15.7...
  • Page 37 Output Water Number Medium Models PLGB Inches Boiler (Note 1) (Note 2) (Note 2) (Note 2) H.P. Gallons lbs. (Note 4) (Note 5) LGB-4-W Water 36.5 1185 1600 LGB-5-W Water 12.6 45.6 1455 1200 1800 LGB-6-W Water 15.7 54.7 1725...
  • Page 38 Notes Part Number 550-141-186/0914...
  • Page 39 Notes Part Number 550-141-186/0914...
  • Page 40 Weil-McLain 500 Blaine Street Michigan City, IN 46360-2388 http://www.weil-mclain.com Part Number 550-141-186/0914...

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