• Installation

Start-Up

• Maintenance

• Parts

3f Assemble Block

Install flue collector hood assembly:

1.Place hood on top of sections with open end of hood tightly against flue collar. Make sure flue collar gasket is in place, not broken, bent or folded.

2.Install 5/16" x 2" carriage bolts, flat washers and regular nuts on both sides of boiler starting at back section joint, continuing at each joint. See Figure 10. Tighten nuts.

3.Fasten hood to sections and flue collar:

a.Slide holddown clip over carriage bolt and flange on hood. Finger-tighten 5/16" flanged nut on carriage bolt. See Figure 10. Repeat for each clip. Where hood joint interferes with clip installation, do not install clip.

b.Install and finger-tighten six 5/16" x 1" flanged bolts and flanged nuts joining hood assembly to flue collar.

c.Center collector hood, making sure it is tight against flue collar. Evenly tighten nuts on holddown clips, being careful not to distort hood.

d. Tighten six 5/16" x 1" flanged bolts and flanged nuts on flue collar to 30 - 35 in.-lbs.

Overtightening bolts in flue collector hood assembly will

cause gasket material to extrude, causing possible flue gas leakage and carbon monoxide emissions, resulting in severe personal injury or death.

4.Check gas-tight seal of flue collector hood and flue collar.

Gas tight seal must be

maintained to prevent possible flue gas leakage and carbon monoxide emissions, resulting in severe personal injury or death.

a. Open damper in flue collar.

bCheck inside section assembly for any light passing through unsealed areas.

c. Mark all unsealed areas.

d. At unsealed areas, check for damaged gaskets, sealing rope not in place, loose bolts or nuts, or missing holddown clips. Correct all conditions and repeat step b. If unsealed areas still exist, contact your Weil-McLain distributor or sales office before continuing installation.

Flanged nut

Holddown clip

Regular nut

Flat washer

Flue collector

hood

Carriage bolt

Flat-stitched sealing rope

Boiler sections

 

Figure 10 Holddown Clip Installation

Part No. 550-141-705

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Weil-McLain 78 manual 3f Assemble Block, Install flue collector hood assembly

78 specifications

The Weil-McLain 78 is a high-efficiency, versatile cast iron boiler that has been a staple in residential and commercial heating applications for decades. Renowned for its durability and performance, the boiler is designed to provide reliable heat while maintaining efficiency and minimizing energy consumption.

One of the main features of the Weil-McLain 78 is its cast iron construction. This material is not only known for its longevity but also for its excellent heat retention properties. The cast iron sections allow for a slow, steady heat release, ensuring that spaces remain warm and comfortable. The boiler is built to withstand the rigors of everyday use, making it ideal for both home and business environments.

In terms of technology, the Weil-McLain 78 incorporates an advanced combustion system that optimizes fuel usage. This efficient burning process not only conserves energy but also contributes to lower utility bills for users. Moreover, the boiler is designed to work well with natural gas or propane, giving homeowners and businesses flexibility in fuel choices.

Another characteristic contributing to the Weil-McLain 78’s reputation is its efficiency ratings. With a rating of 83% AFUE (Annual Fuel Utilization Efficiency), this boiler stands out in its class. This efficiency not only reduces carbon emissions but also enhances overall operational effectiveness, allowing for significant energy savings over time.

The Weil-McLain 78 is also designed for ease of installation and maintenance. Its compact design allows it to fit in tighter spaces, and the accessibility of key components simplifies routine servicing. The unit comes with a multitude of options for controls and accessories, ensuring adaptability to various heating systems.

Furthermore, Weil-McLain places a strong emphasis on safety features. The 78 model incorporates multiple safety controls, including a temperature limit switch and an automatic shut-off system. These features help prevent overheating and provide peace of mind for users.

In conclusion, the Weil-McLain 78 combines robust construction, advanced technology, and efficiency, making it an excellent choice for various heating needs. Its reputation for reliability, comfort, and safety has positioned it as a leader in the boiler market for both residential and commercial applications. With the Weil-McLain 78, users can enjoy consistent warmth and comfort for years to come, backed by a trusted name in heating solutions.