Weil-McLain LGB-13, LGB-7, LGB-14, LGB-8, LGB-20, LGB-15 LGB-6 to LGB-23Series 2 Control Supplement

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LGB-6 to LGB-23Series 2 – Control Supplement

II Existing installation Conversion from natural gas to propane gas

This conversion is to be installed by a Weil-McLain distributor or other qualified agency in accordance with the manufacturer’s instructions and all codes and requirements of the authority having jurisdiction. Failure to follow instructions could result in serious injury or property damage. The qualified agency performing this work assumes responsibility for this conversion.

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

1.These instructions are for use with Propane Control Cartons as listed in Gas Control Arrangement, Table 2 (page 2).

2.Remove jacket door(s) and access panel(s).

3.Disconnect wiring and tubing from existing pilot burner and main flame sensor.

4.Remove all burners. Remove 3.95 mm natural gas main burner orifices in manifold. Install 2.40 mm propane gas main burner orifices. Use pipe dope sparingly only on male ends. Use pipe dope compatible with propane gases. Do not overtighten orifices.

5.Remove and discard existing electronic pilot burner from pilot burner tube. Replace with electronic pilot burner in carton.

6.Attach Q327 standing pilot to burner tube in kit. Connect pilot tubing and thermocouple to pilot.

7.Re-install burners. See Table 1 (page 2) for location of pilot burners and flame sensor(s).

8.Attach pilot switch box to jacket. See Figure 5 (page 10) or Figure 6 (page 11). Connect thermocouple to pilot switch box. Cut 60” pilot tubing into 2 pieces to make connections from tee in pilot line to pilot switch box and from pilot switch box to standing pilot.

9.Remove natural gas valve train.

10.Install propane gas valve train and fittings from carton (See page 5, section III, paragraph 4 of this Supplement).

11.Re-install access panel(s).

12.See Figure 5 (page 10) or Figure 6 (page 11), for propane piping.

13.Wire per wiring diagram, Figure 3 (pages 6 and 7). Add splices as needed.

14.Attach:

a.550-223-710 label at boiler operating instruction label. Place so that this label reads first.

b.550-223-796 label at rating label.

c.Wiring diagram over diagram on door (one on each base).

15.To place in operation, follow instructions on constant burner pilot light-up label and boiler operating label.

16.Replace jacket doors.

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Part Number 550-141-797/0798

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Contents LGBGas-fired boiler New installation Gas control arrangementPilot burner assembly, typical Main flame sensor assemblyLGB-6 to LGB-23Series 2 Control Supplement IV Wiring III Gas pipingWiring diagram IV Wiring Junction box assembly dual base boilersOperating instructions Starting boilerVI Parts list U.S. boilers Parts drawingVII Parts list Canadian boilers Canadian parts drawingWeil-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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