Flame Guardian WMBC-1A Electronic Pilot System – IRI

V Sequence of operation

1.Operating control begins startup sequence:

a.Limit control contacts are closed.

b.Purge timer is energized.

2.Flame safeguard control pilot circuit energizes after 2.0 seconds.

a.Pilot gas valve opens.

b.Ignition transformer energizes.

c.Yellow “pilot on” lamp lights.

d.Pilot ignition spark begins.

e.Pilot ignites.

f.Pilot flame proves.

3.Flame safeguard control energizes main flame circuit:

a.Blue “gas valve on” lamp lights.

b.Gas control train energizes.

c.Downstream gas valve opens to low-fire position.

d.Main burners ignite, operate at low fire.

4.Ignition transformer de-energizes after 10-second trial for ignition.

5.Pilot de-energizes after 10-second trial for main flame. Yellow “pilot on” lamp goes out.

6.Main flame sensor proves main burner operation at low fire.

7.Flame safeguard control energizes downstream gas valve to high-fire (through firing rate control, when used):

a.Main burners operate at high fire.

b.Main burners operate at low fire when water temperature or pressure reaches setting of firing rate control, when used.

8.Boiler shuts down when operating control satisfied.

9.Flame safeguard control lockout circuit energized if pilot is not proved during start-up or if main flame is not proved during run sequence.

a.Flame safeguard control locks out on safety.

b.Red “alarm” lamp, alarm relay, and alarm bell energize. Silencing switch can shut off alarm bell.

c.Alarm relay de-energizes purge timer.

d.Press reset button on flame safeguard control to permit normal start-up after correcting lockout condition.

e.Normal start-up resumes after purge timer automatically resets (5 minute enforced wait).

Part Number 550-141-807/0298

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Weil-McLain WMBC-1A manual Sequence of operation

WMBC-1A specifications

The Weil-McLain WMBC-1A is a highly efficient and versatile boiler designed for residential and commercial heating applications. This innovative model stands out due to its robust construction, advanced technology, and user-friendly features, making it a popular choice among engineers and homeowners alike.

One of the main features of the WMBC-1A is its exceptional efficiency. With an Annual Fuel Utilization Efficiency (AFUE) rating that often exceeds 90%, this boiler operates cost-effectively while minimizing energy consumption. This high efficiency translates into lower utility bills and a reduced carbon footprint, aligning with the growing demand for sustainable heating solutions.

The WMBC-1A utilizes a cutting-edge modulating burner technology that allows the boiler to adjust its output to match the heating demand of the home. This capability ensures optimal performance and comfort, as the system can ramp up or down depending on the current heating needs. This feature also contributes to the boiler’s efficiency, as it prevents the energy waste that often accompanies traditional systems.

Durability is a hallmark of the Weil-McLain WMBC-1A. Constructed from high-quality cast iron, the boiler is designed to endure the rigors of repeated heating cycles and offers a long service life. The unit is also equipped with aluminum heat exchangers that are lightweight yet robust, allowing for efficient heat transfer and quicker response times.

The WMBC-1A also prioritizes safety and ease of use, featuring integrated safety controls and diagnostics that help monitor performance and troubleshoot potential issues. Additionally, the user-friendly digital control system allows homeowners to easily adjust settings and monitor energy usage, ensuring they can maintain comfort without sacrificing efficiency.

With its compact design, the WMBC-1A is suitable for a variety of installation spaces. Its versatility extends to compatibility with various heating systems, including radiators and in-floor heating systems. This flexibility allows users to tailor the system to their specific needs and preferences.

In summary, the Weil-McLain WMBC-1A is a top-tier boiler that combines efficiency, durability, and advanced technology. With its modulating burner, high AFUE rating, safety features, and compatibility with diverse heating systems, it offers exceptional performance for both residential and commercial applications. Its reputation for reliability makes it a smart investment for those looking to enhance their heating systems while promoting energy savings.