• Installation

Start-Up

• Maintenance

• Parts

1a Before Installing Boiler

Installation must comply with:

State, provincial and local plumbing, heating and electrical codes.

Regulations of serving utilities.

National codes where applicable.

Before selecting boiler location:

Check for nearby connections to:

fuel supply

electrical power

system water or steam piping

venting systems - see page 23

combustion and ventilation air supply - see “Provide combustion and ventilation air supply openings” below

Check area around boiler for and remove any combustible materials, gasoline and other flammable vapors and liquids.

Failure to keep boiler area clear and free of combustible materials, gasoline and other flammable liquids and vapors can result in severe personal injury, death and substantial property damage.

Provide combustion and ventilation air openings:

Do not install an exhaust fan in boiler room. Adequate combustion and ventilation air must be provided to assure proper combustion and prevent possibility of flue gas leakage and carbon monoxide emissions, causing severe personal injury or death.

Opening sizes must comply with state, provincial or local codes. In their absence, use the following when boiler is in a confined room:

• Provide two permanent openings in boiler

room - one within 12 inches of ceiling, one

within 12 inches of floor. Minimum dimension

of each opening - 3 inches.

- When all air is taken from within building,

each opening should be at least one square

inch/1,000 Btuh boiler input and freely

connect with areas having adequate

infiltration from outside

- When all air is taken from outdoors, each

opening should connect directly or by ducts

from outdoors or crawl or attic spaces that

freely connect with outdoors and sized as

listed below:

- through outside wall or vertical ducts - at

least one square inch/4,000 Btuh boiler

input

- through horizontal ducts - at least one

square inch/2,000 Btuh boiler input

- where ducts are used, they should be same

cross-sectional area as free area of

openings they are connected to

- compensate for louver, grille or screen

blockage when calculating free air

openings. Refer to their manufacturer’s

instructions for size. If unknown, use:

- wood louvers - 20-25% free air

- metal louvers or grilles - 60-75% free air

- screens - not less than 1/4 inch mesh

Lock louvers in open position, or interlock

with equipment to prove open before

Grating – Min. 12" above avg. snowline

GRADE

Areaway

Note:

Size of areaway and grating to be equal to or greater than total louver area.

Louver

Boiler room floor

boiler operation.

Louver – Min. 12" above avg. snowline

Note:

GRADE Duct size equal to total louver area

Boiler room floor

Figure 1 Combustion and Ventilation Air

Figure 2 Combustion and Ventilation Air

Openings Boiler Room Below Grade

Openings Boiler Room Partially or Completely

Part No. 550-141-705

Above Grade

3

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Weil-McLain 78 manual 1a Before Installing Boiler, Installation must comply with, Before selecting boiler location

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.