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

Contents

1.

Before Installing Boiler

page 3

2.

Set Packaged Boiler or Block Assembly in Place

page 5

3.

Assemble Block

page 6

4.

Perform Hydrostatic Pressure Test

page 12

5.

Connect Water Boiler Piping

page 13

6.

Connect Steam Boiler Piping

page 15

7.

Install Jacket

page 19

8.

Pipe Tankless Heaters

page 19

9.

Install Water Boiler Controls

page 20

10.

Install Steam Boiler Controls

page 21

11.

Connect Breeching and Venting Systems

page 23

12.

Install Burner

page 24

13.

Wiring and Fuel Piping

page 24

14.

Make Final Adjustments

page 25

15.

Data and Dimensions

page 27

16.

Parts

page 29

17.

Ratings

page 31

Warranty

Back Cover

When Calling or Writing about the Boiler

Please have model and series from boiler rating label and CP number(s) from boiler jacket or controls.

Hazard Definitions

The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels, or to important information concerning the life of the product.

Indicates presence of hazards that will cause severe personal injury, death or substantial property damage if ignored.

Indicates presence of hazards that can cause severe personal injury, death or substantial property damage if ignored.

Indicates presence of hazards that will or can cause minor personal injury, death or substantial property damage if ignored.

Indicates special instructions on installation, operation or maintenance that are important but not related to personal injury.

Read all instructions before installing. Failure to follow all instructions in proper order can cause severe personal injury, death or substantial property damage.

2

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

Part No. 550-141-705

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Weil-McLain 78 manual Contents

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.