Boiler manual: • Installation • Start-Up • Maintenance • Parts

Connect breeching and venting systems

General venting information

1.Model 88 boilers operate with positive overfire pressure. Adjust damper assembly (see Figure 49, page 33) during burner start-up to achieve 0.1" W.C. positive pressure at damper sample hole.

Select type of venting system

Forced draft

Boiler, breeching and stub vent operate at positive pressure. Entire system must be gas-tight to prevent leaks. Stub vent height must be limited to prevent negative draft with 3-foot minimum stub vent height above roof. See Figure 44 and Figure 46.

Balanced draft

Boiler operates with positive pressure overfire. Chimney may provide excess draft which may require a barometric draft control installed and set to provide minimum draft to maintain 0.1" posi- tive pressure at flue collar. Minimum chimney height above roof is 3 feet. See Figure 45 and Figure 47.

Construct metal breeching:

1.See Figure 43 for minimum breeching diameter.

2.Select material type and thickness in compliance with local codes.

Conventional flue pipe should not be used as it could leak flue gases and carbon monoxide emissions through seams and joints, resulting in severe personal injury or death.

3.Refer to ASHRAE Guide for chimney and breeching calculations and construction and lining.

Long horizontal breechings, excessive number of tees and elbows or other obstructions restricting combustion gas flow can result in possibility of condensation, flue gas leakage and carbon monoxide emissions, causing severe personal injury or death.

Figure 43 Minimum breeching diameter

Boiler

I=B=R

Boiler flue

model

vent or liner diameter

collar

 

(inches)

dimensions

 

 

 

(inches)

 

Forced

Balanced

 

 

draft

draft

 

 

 

 

 

488

10

12

10 round

 

 

 

 

588

10

15

10 round

 

 

 

 

688

12

15

10 round

 

 

 

 

788

12

18

12 round

 

 

 

 

888

14

18

12 round

 

 

 

 

988

14

18

14 round

 

 

 

 

1088

14

21

14 round

 

 

 

 

1188

16

21

14 round

 

 

 

 

1288

16

21

14 round

 

 

 

 

1388

16

24

14 round

 

 

 

 

1488

18

24

16 round

 

 

 

 

1588

18

24

16 round

 

 

 

 

1688

18

24

16 round

 

 

 

 

1788

18

24

16Z\, x 19M\, oval

 

 

 

 

1888

20

27

16Z\, x 19M\, oval

 

 

 

 

Part No. 550-100-068/0308

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Weil-McLain 88 manual Connect breeching and venting systems, General venting information, Select type of venting system

88 specifications

The Weil-McLain 88 series is a commercial cast iron boiler recognized for its durability, efficiency, and versatile design, making it a preferred choice for various heating applications. Designed primarily for commercial and industrial use, the Weil-McLain 88 combines advanced technology with proven engineering principles to deliver reliable performance and long-lasting service.

One of the standout features of the Weil-McLain 88 is its cast iron construction. Cast iron is renowned for its ability to retain heat, resulting in lower fuel consumption and more consistent heating. This robust material ensures that the boiler can withstand high temperatures and pressures, making it suitable for heavy-duty applications. The sectional design of the boiler allows for easy installation and maintenance, enabling quick access to components and minimizing downtime.

In terms of efficiency, the Weil-McLain 88 is designed to achieve high thermal efficiency ratings. The boiler employs a flue gas recirculation system, which significantly reduces heat loss and maximizes energy utilization. Additionally, its low water content provides rapid heating response times, ensuring that spaces are heated promptly, even during peak demand periods.

Another noteworthy characteristic of the Weil-McLain 88 is its versatility. The boiler can be configured for a variety of applications, including hot water heating, hydronic heating systems, and steam heating. It is compatible with multiple fuel types, including natural gas, propane, and various oil options, allowing for flexibility in fuel choice based on availability and pricing.

The Weil-McLain 88 also incorporates advanced control technologies that enhance operational efficiency. The integrated electronic controls feature diagnostic capabilities to streamline troubleshooting and maintenance, ensuring optimal performance throughout the boiler’s lifespan. Moreover, the boiler's design is compatible with modern building management systems, allowing for seamless integration into existing heating setups.

Overall, the Weil-McLain 88 series stands out for its combination of quality construction, efficient operation, and adaptability to different heating needs. Whether for a commercial building, industrial facility, or institutional application, the Weil-McLain 88 provides a reliable and efficient heating solution that meets the demands of the modern world.