Weil-McLain LGB-15, LGB-7, LGB-14, LGB-8, LGB-20, LGB-13, LGB-12, LGB-17 manual III Gas piping, IV Wiring

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Universal Control System – Propane gas

III Gas piping

1.Contact gas supplier to size pipes, tanks and regulator.

a.Inlet gas pressure to manual main shut-off gas valve — minimum 11”W.C., maximum 13”W.C.

b.If pressure to gas valve exceeds 13” W.C., install 100% lock-up gas pressure regulator upstream of hand valve.

2.Remove gas supply knockout disc from jacket panel.

3.Follow good piping practices.

4.Pipe joint compound (pipe dope) must be resistant to corrosive action of liquefied petroleum gases. Apply sparingly only to male threads of pipe joints.

5.Install drip leg at inlet of gas connection to boiler. Where local utility requires, extend drip leg to floor.

6.Install ground joint union when required for servicing.

7.Support piping by hangers, not by boiler or its accessories.

8.Purge all air from supply piping.

9.Before operating boiler, check boiler and its gas connections for leaks.

Do not check for gas leaks with an open flame – BUBBLE TEST. Failure to use bubble test or test for leaks can cause severe personal injury, death or substantial property damage.

a.Close manual main shut-off valve during any pressure testing at less than 13” W.C.

b.Disconnect boiler and gas valve from gas supply piping during any pressure test greater than 13” W.C.

10.Set gas pressure switch as follows or to local inspector’s requirements (LGB-21 through LGB-23 only):

a.High – 14” W.C.

11.Canada only - manual main shut-off valve must be identifed by installer.

IV Wiring

For your safety, turn off electrical power supply before making any electrical connections to avoid possible electrical shock hazard.

1.All wiring must be installed in accordance with the requirements of the National Electrical Code and any additional national, state or local code requirements having jurisdiction. All wiring must be N.E.C. Class 1.

2.The boiler must be electrically grounded in accordance with the National Electrical Code, ANSI/NFPA No. 70-latest edition. Use 105 °C. thermoplastic wire, or equivalent, if any of the original wire must be replaced (except for pilot spark, sense and ground wires).

3.Canadian installations must conform to CSA C22.1 Canadian Electrical Code Part 1 and any local or provincial codes.

4.Supply wiring to the boiler must be No. 14 gauge or heavier. Install in conduit.

5.A separate electrical circuit with a fused disconnect switch (15 amp. recommended) should be used for the boiler.

Part Number 550-141-797/0798

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Contents LGBGas-fired boiler Gas control arrangement New installationMain flame sensor assembly Pilot burner assembly, typicalLGB-6 to LGB-23Series 2 Control Supplement III Gas piping IV WiringWiring diagram Junction box assembly dual base boilers IV WiringStarting boiler Operating instructionsParts drawing VI Parts list U.S. boilersCanadian parts drawing VII Parts list Canadian boilersWeil-McLain Blaine Street Michigan City,

LGB-19, LGB-6, LGB-8, LGB-11, LGB-7 specifications

Weil-McLain's LGB series of cast iron boilers, including models LGB-10, LGB-9, LGB-8, LGB-18, and LGB-15, are renowned for their efficiency, durability, and reliable performance in commercial and industrial heating applications. These boilers are designed to meet a broad range of heating demands, making them a popular choice among professionals in the HVAC industry.

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The LGB series employs an advanced burner system that enhances combustion efficiency. The gas-fired models are equipped with a power burner that ensures precise fuel-to-air ratios, resulting in optimal combustion and reduced greenhouse gas emissions. Additionally, Weil-McLain boilers are designed to operate quietly, making them suitable for use in noise-sensitive environments.

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The LGB-10, LGB-9, LGB-8, LGB-18, and LGB-15 models are available with various options such as built-in draft diverters and low water cut-off features to enhance safety and performance. Moreover, these boilers are compatible with different types of heating systems, including hot water and steam applications, making them versatile for a variety of installations.

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