LGB-6 to LGB-20Series 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 6 (page 12). 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 IV, paragraph 4 of this Supplement).

11.Re-install access panel(s).

12.See Figure 6, page 12 for propane piping.

13.Wire per wiring instructions and wiring diagrams, pages 5-9. 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.

IIIWater and steam trim components

1.Install water or steam trim components as required by CSD-1 latest edition. See the boiler manual for tapping locations.

a.Water boilers require:

•a manual reset high temperature limit control in addition to the standard automatic reset limit control.

•a manual reset low water cutoff.

b.Steam boilers require:

•a manual reset high pressure limit control in addition to the standard automatic reset limit control.

•a manual reset low water cutoff in addition to the standard automatic reset low water cutoff.

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Part Number 550-141-816/0798

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Weil-McLain 6-20 Series operating instructions III Water and steam trim components
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6-20 Series specifications

The Weil-McLain 6-20 Series is designed to meet the heating needs of residential and commercial properties with exceptional efficiency and reliability. This versatile steam and hot water boiler series is known for its robust construction and innovative technologies, making it a preferred choice among heating professionals.

One of the main features of the 6-20 Series is its durable cast iron construction, which ensures longevity and superior performance. The cast iron sections provide excellent heat retention, allowing the boiler to efficiently transfer heat to the water or steam, thus enhancing overall energy efficiency. The design is optimized to withstand high pressure and temperature, making it exceptionally resilient under demanding conditions.

Efficiency is at the heart of the 6-20 Series, with models designed to achieve high Annual Fuel Utilization Efficiency (AFUE) ratings. These efficiencies are made possible through advanced combustion technology and smart controls that monitor and adjust the heating process based on real-time needs. This not only conserves fuel but also reduces greenhouse gas emissions, supporting environmentally-friendly heating solutions.

Another significant advancement in the Weil-McLain 6-20 Series is its integrated control system. The advanced boiler control features programmable settings that allow users to customize their heating cycles, enabling better management of energy consumption and operational costs. Furthermore, the boiler comes equipped with a state-of-the-art burner system that ensures clean and efficient combustion, contributing to reduced maintenance needs.

The 6-20 Series also prioritizes user-friendliness, with installation and maintenance simplified through thoughtful engineering. Its compact design allows for flexibility in placement, whether in basements, mechanical rooms, or other areas with limited space. The high-quality insulation minimizes heat loss, further enhancing efficiency and performance.

Safety features are robust in the Weil-McLain 6-20 Series, ensuring peace of mind for homeowners and building managers. Integrated safety controls help monitor the pressure and temperature levels, preventing potentially hazardous situations and ensuring optimal operation.

In conclusion, the Weil-McLain 6-20 Series stands out with its combination of rugged construction, leading-edge technology, and user-oriented design. Whether for residential or commercial applications, its efficient performance and commitment to safety make it a reliable choice for heating solutions.
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