Weil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners

3c Assemble Block

Prepare remaining sections:

1.Follow “Prepare intermediate section” for remaining intermediate and front sections:

a.Remove any grit from threads inside tapped holes with clean rag.

Do not use petroleum-based cleaning or sealing compounds in boiler system. Severe damage to system components can result, causing substantial property damage.

b. Install TI (Tankless Intermediate) and SI (Supply Intermediate) sections (when used) in order shown in “Section Arrangement Table”.

c. Check each section for proper sealing rope position before proceeding to next section.

Failure to position sealing rope properly can cause boiler to not seal gas-tight. Gas-tight seal prevents possible flue gas leakage and carbon monoxide emissions, resulting in severe personal injury or death.

Section Arrangement Table

 

 

Maximum

Section Arrangement

Boiler

No. of

(all heaters must be

Model

Heaters

on left side of boiler)

 

 

 

378 W&S

1

F-TI-B

 

 

 

478 W&S

1

F-TI-I-B

578 W&S

2

F-TI-I-TI-B

 

 

 

678 W&S

2

F-TI-I-TI-I-B

778 W&S

2

F-TI-I-TI-I-I-B

 

 

 

878 W&S

3

F-TI-I-TI-I-I-TI-B

978 W&S

3

F-TI-I-TI-I-TI-I-I-B

 

 

 

 

1078

W

3

F-TI-I-TI-I-I-TI-I-I-B

1078

S

3

F-TI-I-TI-SI-I-TI-I-I-B

 

 

 

1178 W

4

F-TI-I-TI-I-I-I-TI-I-TI-B

1178 S

4

F-TI-I-TI-I-SI-I-TI-I-TI-B

 

 

 

 

1278

W

4

F-TI-I-TI-I-I-I-I-TI-I-TI-B

 

 

 

 

1278

S

4

F-TI-I-TI-I-SI-I-I-TI-I-TI-B

 

 

 

 

If you would like to pressure-test block

assembly now, proceed to page 12.

d. Make sure bottom refractory blanket has been installed per instructions on page 7.

Install burner mounting plate on front section:

1.Install four 1/2" x 4-3/4" studs to secure burner mounting plate to section:

a.Thread and lock together two nuts on rounded end of stud. Thread flat end of stud into one of four holes located around opening.

b.Remove nuts.

c.Repeat steps a and b for remaining studs.

2.Install burner mounting plate:

a.Apply 1/8" continuous bead of sealing rope adhesive in groove around opening in section.

b.Position 1/2" sealing rope in groove. Overlap ends at least one inch.

c.Install burner mounting plate. Use 1/2" washers and nuts.

Install observation port assemblies on front and back sections:

1.Install front observation port assembly:

a.Apply 1/8" continuous bead of sealing rope adhesive in groove on observation port.

b.Position 3/8" sealing rope in groove. Overlap ends at least one inch.

c.Secure assembly to section. Use 5/16-18 x 3/4" slotted head screws.

2.Repeat above steps for back observation port assembly.

If using TI sections:

Install tankless heaters and gaskets or heater cover plates and gaskets. Use 3/8" x 3/4" studs and nuts.

W=Water, S=Steam, F=Front, TI=Tankless Intermediate, I=Intermediate, SI=Supply Intermediate for steam boilers, B=Back. “I” sections can be substituted for “TI” sections.

8

Part No. 550-141-705

Page 8
Image 8
Weil-McLain 78 manual 3c Assemble Block, Prepare remaining sections, Install burner mounting plate on front section

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.