Weil McLain Boiler Reset Button - LGB-6 to LGB-20 Series Manual

LGB-6 to LGB-20Series 2 – Control Supplement

V Wiring – continued

Sequence of operation 1. Operating control begins startup sequence.

a.Limit control contacts are closed.

2.Pilot proving module energized.

a.Pilot solenoid opens.

b.Pilot ignition spark begins.

c.Pilot ignites.

d.Pilot proves.

On failure to sense pilot flame, the pilot-proving module will wait 5 minutes, then retry for ignition. Upon 2 consecutive pilot flame failures, the control will lockout and illuminate the red lockout light.

3.Main flame proving module energized from pilot proving module.

a.Secondary gas valve opens.

b.Main gas valve opens to low fire position.

c.Main burners ignite at low fire.

d.Main flame sensor proves low fire carryover.

e.Main gas valve opens to high fire position.

f.Main burners increase to high fire.

On failure to sense main flame, the main flame-proving module will lockout and illuminate the red lockout light.

4.For dual base assembly - operating control energizes controls for each base assembly at the same time. See steps 1 through 3 above.

5.Boiler shuts down when operating control satisfied.

If the boiler locks out, the alarm contacts on the terminal strip (terminals A1 and A2) close. These contacts are rated to 15 amps, 250 V. To reset the boiler, push the red lockout button.

Wiring procedure 1. Determine right or left electrical supply wiring.

2.Attach electrical junction box(es) to inside jacket end panel. Screws and nuts are provided. For dual base boilers, use offset nipples (provided) to connect junction boxes together (as at right), then hang junction boxes by screwing top box to boiler jacket. See Figure 4.

3.Attach control transformer(s) to junction box(es).

4.Drill 1/8” hole in interior jacket panel midway between ignition control panel and left jacket panel. Mount wire support clip using sheet metal screw (furnished).

5.Complete wiring per diagrams, Figure 3 (pages 6 and 7) and Figure 5 (page 9). Terminate at secondary gas valve in valve junction box with wirenuts and strain relief provided.

“Hot” side of line voltage to boiler must be wired directly to limit circuit, then fed to transformer primary(ies).

Dual Base: “R” terminal of secondaries are to supply power to bases independently of each other. Do not wire “R” terminals together.

6.Install pilot proving and main flame proving ground connections as shown in Figures 1 and 2 and wiring diagram. Route wires through wire support clip.

Figure 4

Junction box assembly dual base boilers

8	Part Number 550-141-816/0798

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.