Weil-McLain LGB-4, LGB-5 operating instructions Verification testing

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LGB-4 & 5 Control Supplement UCS Nat. Gas

V Verification testing

Manual test firing valve

Verify boiler control sequence

Leak test automatic gas valve

Before starting boiler for the first time and at least annually (during annual inspection and start-up), follow the procedures below to verify boiler controls are operating correctly and that automatic gas valve properly shuts off gas flow. Failure to verify boiler operation could result in severe personal injury, death or substantial property damage.

This boiler is equipped with a manual test firing valve — the manual gas valve piped between the gas manifold and the automatic gas valve. Closing the manual test firing valve allows verification of proper boiler operation without allowing gas flow to the manifold and allows leak testing of the automatic gas valve. Follow the procedures below.

1.Follow the Operating Instructions in this Supplement to start the boiler, but do not open the manual test firing valve. Open all other manual gas valves as instructed. Leave the manual test firing valve closed.

2.The automatic pilot burner should light.

3.After the pilot lights, the boiler controls should activate the automatic gas valve. Use a voltmeter to verify voltage to automatic valve.

4.With no gas flow to the manifold, the boiler ignition controls should turn off the automatic gas valve after main flame ignition trial. Use a voltmeter to verify voltage to automatic valve is turned off.

1.Close manual test firing valve.

2.Open the service valve. Press down and turn automatic gas valve knob (or lever) to ON.

3.Install a hose barb into a pressure tap downstream of the automatic gas valve. Allow any accumulated gas in the line to vent off. Then connect a U-tube manometer. If the valve seals properly, there should be no gas pressure present. Remove manometer and hose barb and replace pipe plug in pressure tap.

4.Remove the manometer and plug any open pressure taps.

5.Follow Operating Instructions to place boiler in service.

Replace any defective components. Do not attempt to operate boiler or leave boiler in operation if any component is found to be defective or to operate incorrectly. Failure to comply could result in severe personal injury, death, or substantial property damage.

Part Number 550-141-918/0304

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Contents LGB-4 & LGB-5 Series 2 Natural gas ContentsInstallation Supply pipe sizing II Gas pipingConnect gas piping to boiler III WiringWiring Requirements Starting boiler IV Operating instructionsVerification testing VI Parts list

LGB-5, LGB-4 specifications

Weil-McLain has long been a respected name in the heating industry, known for their commitment to quality and efficiency. Among their impressive product line, the LGB-4 and LGB-5 steam boilers stand out as reliable choices for commercial and industrial heating applications. These boilers are designed to deliver efficient performance while maintaining ease of installation and operation.

The Weil-McLain LGB-4 and LGB-5 are cast iron steam boilers, with a robust design that ensures durability and longevity. The LGB-4 has a firing range of 175 to 600 MBH (thousands of BTUs per hour), making it suitable for medium to large heating loads. The LGB-5, on the other hand, offers a firing range of 300 to 1,200 MBH, catering to larger industrial applications. This versatility allows for a wide range of configurations, making the boilers suitable for various applications in commercial buildings, schools, and healthcare facilities.

One of the prominent features of the LGB series is its Modular Design. This design allows for multiple boilers to be linked together to provide efficient heating for larger buildings. By employing multiple heating units, the system can respond more effectively to varying heating demands, resulting in reduced energy consumption and increased efficiency.

Energy efficiency is a standout characteristic of the LGB-4 and LGB-5. Both models are designed with advanced combustion technology, ensuring optimal fuel utilization and lower emissions. The cast iron construction not only provides durability but also excellent thermal mass, helping to maintain steady temperature control while reducing fuel costs. The optional low-NOx burners further minimize environmental impact, adhering to stringent emissions regulations.

Another innovative feature is the built-in venting options that allow for flexibility in installations. These boilers can be vented vertically or horizontally, providing versatile installation choices that can adapt to existing infrastructure.

The user-friendly control panel with integrated diagnostic capabilities simplifies operation and maintenance. Features such as a standard electronic ignition system reduce manual intervention, and the modulating burner promotes more precise control of the steam output.

In summary, the Weil-McLain LGB-4 and LGB-5 steam boilers provide a combination of durability, efficiency, and flexibility. With their modular design, advanced combustion technologies, and user-friendly controls, these boilers are well-suited for a variety of commercial and industrial heating needs, ensuring reliable performance and peace of mind for building managers and facility operators.