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Weil-McLain LGB Manual

Lgb series gas-fired boiler
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See also: User's Information Manual , Manual
LG
LG B B B B B
LG
LG
LG
Boiler Manual
• Installation
• Start-up
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
Gas–Fired Boiler
• Maintenance
• Parts
Control Supplement
for additional information
Part No. 550-141-186/0703
Refer to

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Summary of Contents for Weil-McLain LGB

  • Page 1 LG B B B B B Gas–Fired Boiler Boiler Manual • Installation • Maintenance • Start-up • Parts 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.

  • Page 2: Read This Page First

    Gas-Fired Boiler — Boiler Manual Read this page first 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 definitions product.

  • Page 3: Table Of Contents

    • Installation • Start-Up • Maintenance • Parts Contents 1 1 1 1 1 Pre-installation Codes ..................4 Air openings ................4 Venting ..................6 Foundation .................. 8 2 2 2 2 2 Boiler assembly Base.....................9 Sections ..................10 Hydrostatic pressure test ............12 Cleanout plates .................14 Flue collector hood..............15 3 3 3 3 3...

  • Page 4: Pre-Installation

    Gas-Fired Boiler — Boiler Manual Pre-installation — — — — — air openings air openings air openings air openings air openings Codes Installations must comply with all local codes, laws, regulations and ordinances, also National Fuel Gas Code ANSI Z223.1–latest edition. When required, installations must conform to Standard for Controls and Safety Devices for Automatically Fired Boilers, ANSI/ASME CSD-1.
  • Page 5 • Installation • Start-Up • Maintenance • Parts Combustion air • Tightly constructed buildings must be provided with openings to outside for combustion and ventilation air. These openings must be sized to handle all fuel-burning appliances, and ventilation exhaust and ventilation fans and fireplaces. openings •...

  • Page 6: Venting

    Gas-Fired Boiler — Boiler Manual Pre-installation — — — — — venting venting venting venting venting Chimney or Vent Venting must be installed according to Part 7, Venting of Equipment, of National Fuel Gas Code, ANSI Z223.1–latest edition and applicable building codes. Canadian installations must comply with CAN/CSA B149.1 or B149.2 Installation Code.
  • Page 7 • Installation • Start-Up • Maintenance • Parts Figure 3 Figure 4 Individual Combined stub vents vents Figure 5 Offset vents Notes Minimum vent height using full size connector. Minimum 2 feet above any structure within 10 feet. Vent and combined vent materials, length and diameter must be determined using the combined venting tables of the National Fuel Gas Code, ANSI Z223.1–latest edition, or...

  • Page 8: Foundation

    • Minimum 24" between jacket and combustible walls and ceiling. For LGB-6 through LGB-23 IRI and LGB-21 through LGB-23 FM/CSD-1, the gas train is located outside the boiler. Provide additional clearance. Install in a space large in comparison to size of boiler.

  • Page 9: Boiler Assembly Base

    Base Arrangement Table (Note 1) Figure 7 Boiler Base Size Boiler Base Size Model Model Number Number Access shield (sizes D, E, F LGB-4 LGB-14 and G LGB-5 LGB-15 shown) LGB-6 LGB-16 LGB-7 LGB-17 LGB-8 LGB-18 LGB-9 LGB-19...

  • Page 10: Sections

    Gas-Fired Boiler — Boiler Manual Boiler assembly — — — — — sections sections sections sections sections Section assembly Assembly may start at either end section. For easier assembly start with right end section. 1. Position right end section flush with right end of base. See on page 15.
  • Page 11 If corrections are made and gap still exists, contact your Weil-McLain 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.

  • Page 12: Hydrostatic Pressure Test

    Gas-Fired Boiler — Boiler Manual Boiler assembly — — — — — pressure test pressure test pressure test pressure test pressure test Hydrostatic pressure Pressure test before connecting gas piping and electrical supply. test 1. Refer to for control tapping locations. Install: Figures 11a and 11b a.
  • Page 13 • Installation • Start-Up • Maintenance • Parts Hydrostatic pressure 4. Check for maintained gauge pressure and leaks. Repair if found. test 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

    Gas-Fired Boiler — Boiler Manual Boiler assembly — — — — — cleanout plates cleanout plates cleanout plates cleanout plates cleanout plates The boiler contains ceramic fiber and fiberglass materials. Use care when handling these materials per instructions on page 28 of this manual.

  • Page 15: Flue Collector Hood

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

  • Page 16: Piping

    , below. Table 2 Notes 1 Models LGB-4 through LGB-12 only — alternate supply tapping for supply and return on same end. 2 Models LGB-4 through LGB-12 only — alternate return tapping for supply and return on same end.
  • Page 17 • Installation • Start-Up • Maintenance • Parts Primary/secondary Weil-McLain recommends piping Figure 15 as shown in . For single Figure 15 piping boilers, pipe as shown for one unit. (systems above 140°F) Size secondary boiler pump GPM for 20°F to 40°F temperature rise through boiler.

  • Page 18: Steam Boilers

    Pipe the header at least 24 inches above the boiler water line. Weil-McLain recommends using a boiler feed system, with the pump operated by a level controller on the boiler. Weil-McLain does not recommend using a condensate return system on which the pump is operated by a receiver-mounted float switch.
  • Page 19 Steam Select minimum receiver capacity based on time Number Capacity Condensate receiver capacity (minutes), required for condensate to return to the receiver. (minimum) lbs/hour gallons/hour GPM @ 15 PSI LGB-4 324.0 LGB-5 421.2 LGB-6 526.5 LGB-7 631.8 LGB-8 737.1 LGB-9 842.4...

  • Page 20: Multiple Steam Boilers

    Gas-Fired Boiler — Boiler Manual Piping — — — — — multiple steam boilers multiple steam boilers multiple steam boilers multiple steam boilers multiple steam boilers Figure 20 Piping multiple steam boilers Notes Each boiler has a boiler feed pump controller (not shown). Level controls (Section 6) must be mounted on same side of boiler as return. Mount each boiler feed pump controller with body mark at the level indicated in Table 4, page 22 and Figure 23, page 23.

  • Page 21: Jacket

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

  • Page 22: Install Boiler Controls

    Notes Other manufacturers’ controls providing similar function may be used, if properly located and selected to handle boiler evaporative capacity. Weil-McLain does not recommend using McDonnell & Miller Model 157 or 193. Cannot be used as backup water level controls.
  • Page 23 • Installation • Start-Up • Maintenance • Parts Nipple, 1" x 4", (2) Figure 22 Union, 1", (2) Steam boiler control installation Nipple, 1" x 2½", (2) Cross, 1", (2) Nipple, 1" x 2", (1) Nipple, 1" x 7", (1) (used only with Model 61 lwco;...

  • Page 24: Final Adjustment Water Boilers

    Gas-Fired Boiler — Boiler Manual Final Adjustments — water boilers Water treatment Do not use petroleum-based cleaning or sealing compounds in boiler system. Severe boiler damage will occur. Continual fresh makeup water will reduce boiler life. Minerals can build up in sections, reducing heat transfer, overheating cast iron, and causing section failure.

  • Page 25: Steam Boilers

    • Installation • Start-Up • Maintenance • Parts Final Adjustments — steam boilers Water treatment Do not use petroleum-based cleaning or sealing compounds in boiler system. Severe boiler damage will occur. Continual fresh makeup water will reduce boiler life. Minerals can build up in sections, reducing heat transfer, overheating cast iron, and causing section failure.

  • Page 26: Placing Boiler In Operation

    Gas-Fired Boiler — Boiler Manual Placing boiler in operation To place boiler 1. Turn operating control to position or lowest position on dial. Be sure boiler has been correctly filled with water. in operation 2. Turn electric power. Before lighting Main shutoff gas valve must be closed for at least five (5) minutes before pilot lighting to prevent minor personal injury or property damage.

  • Page 27: Check-Out Procedure

    • Installation • Start-Up • Maintenance • Parts Check-out procedure — check off steps as completed 1. System properly filled with water? 2. Automatic air vent, if used, open one turn (water boilers only)? 3. Air purged from system (water boilers only)? 4.

  • Page 28: Maintenance

    Gas-Fired Boiler — Boiler Manual Maintenance — read this page first Also refer to additional instructions shipped with boiler for specific control operation and troubleshooting. Have your boiler inspected, cleaned and, if necessary, adjusted once a year by a qualified service agency.
  • Page 29 • Installation • Start-Up • Maintenance • Parts Maintenance — minimum schedule Beginning of each 1. Annual service call by a qualified service agency. heating season 2. Check burners and flueways and clean if necessary. Refer to Clean boiler heating surfaces , page 31.
  • Page 30 Gas-Fired Boiler — Boiler Manual 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. Inspect base 1.

  • Page 31: Main Burners

    • Installation • Start-Up • Maintenance • Parts 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. Inspect 1.

  • Page 32: Replacement Parts

    Gas-Fired Boiler — Boiler Manual Replacement parts Base Insulation Table Base Size Base Insulation Size (Note 1) (Note 2) A and K B and K A and J B and J Notes: 1. See page 9, Base Arrangement Table, to determine base size for your boiler.
  • Page 33 • Installation • Start-Up • Maintenance • Parts Part Number 550-141-186/0703...

  • Page 34: Dimensions

    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: Equipment - Standard And Optional

    1. 1 ½" Inspection Tappings with Brass Plugs — one per section 2. Water Level Controls 3. Pilot Pressure Regulator 4. Low-High-Low Firing (LGB-6 through LGB-23 only); Stage Firing (LGB-13 through LGB-23 only) — base 1 on high fire, base 2 on high fire, low/high, low/low Part Number 550-141-186/0703...

  • Page 36: Ratings

    13 — 1.332, LGB-14 — 1.322, LGB-15 — 1.312, LGB-16 — outlet and the height may be reduced to five feet (5') measured above the draft hood outlet.

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