LGB-4 & 5 • Control Supplement • UCS • Nat. Gas

II Gas piping

Supply pipe sizing

Connect gas piping to boiler

Table 1

Gas supply pipe capacities

1.Size natural gas piping from Table 1. Size piping to provide proper inlet pressure to gas valve when operating at rated input.

a.Inlet gas pressure to manual main shut-off gas valve minimum 5" W.C., maximum 13" W.C.

b.If pressure to gas valve exceeds 13" W.C., install 100% lock-up gas pressure regulator upstream of hand valve.

c.To obtain approximate cubic feet per hour, divide input (Btu/hr) by 1000.

2.Size gas piping considering:

a.Diameter and length of gas supply piping.

b.Number of fittings.

c.Maximum gas consumption (including any possible future expansion).

d.Allowable pressure drop from gas meter to boiler. For pressure drops, see ANSI Z233.1 latest edition. Canadian installations must comply with B149.1 or B149.2 Installation Code.

3.Remove knockout disc from jacket panel side to which gas supply will be piped.

4.Follow good piping practices.

5.Pipe joint compound (pipe dope) must be resistant to corrosive action of liquefied petroleum gases. Apply sparingly only to male threads of pipe joints.

6.Install drip leg at inlet of gas connection to boiler. Where local code/utility requires, extend drip leg to floor.

7.Install ground joint union when required for servicing.

8.Support piping by hangers, not by boiler or its accessories.

9.Purge all air from supply piping.

10.Before operating boiler, check boiler and its gas connections for leaks.

Do not check for gas leaks with an open flame - use bubble test. Failure to use bubble test or check for leaks can cause severe personal injury, death or substantial property damage.

a.Close manual main shut-off valve during any pressure testing greater than 13" W.C.

b.Disconnect boiler and gas valve from gas supply piping during any pressure test greater than 13" W.C.

11.In Canada — manual main shut-off valve must be identified by installer.

 

 

 

 

Pipe length, feet *

 

 

 

PIPE

 

 

(Natural gas capacities given in MBH)

 

 

 

(Specific Gravity 0.60 @ Pressure Loss of 0.30" W.C.)

 

SIZE

 

 

 

 

 

 

 

 

 

 

 

10

20

30

40

50

75

100

150

 

 

 

 

 

 

 

 

 

1 1/4"

1,050

730

590

500

440

360

305

250

 

 

 

 

 

 

 

 

 

1 1/2"

1,600

1,100

890

760

670

545

460

380

2"

3,050

2,100

1,650

1,450

1,270

1,020

870

710

 

 

 

 

 

 

 

 

 

2 1/2"

4,800

3,300

2,700

2,300

2,000

1,650

1,400

1,130

3"

8,500

5,900

4,700

4,100

3,600

2,900

2,500

2,000

 

 

 

 

 

 

 

 

 

4"

17,500

12,000

9,700

8,300

7,400

6,000

5,100

4,100

 

 

 

 

 

 

 

 

 

*Include measured length of gas supply piping and allowance in feet for number and size of fittings.

Part Number 550-141-918/0304

3

Page 2 Page 4
Page 3
Image 3
Weil-McLain LGB-4, LGB-5 operating instructions II Gas piping, Supply pipe sizing, Connect gas piping to boiler
Page 2 Page 4

LGB-5, LGB-4 specifications

Weil-McLain has long been a respected name in the heating industry, known for their commitment to quality and efficiency. Among their impressive product line, the LGB-4 and LGB-5 steam boilers stand out as reliable choices for commercial and industrial heating applications. These boilers are designed to deliver efficient performance while maintaining ease of installation and operation.

The Weil-McLain LGB-4 and LGB-5 are cast iron steam boilers, with a robust design that ensures durability and longevity. The LGB-4 has a firing range of 175 to 600 MBH (thousands of BTUs per hour), making it suitable for medium to large heating loads. The LGB-5, on the other hand, offers a firing range of 300 to 1,200 MBH, catering to larger industrial applications. This versatility allows for a wide range of configurations, making the boilers suitable for various applications in commercial buildings, schools, and healthcare facilities.

One of the prominent features of the LGB series is its Modular Design. This design allows for multiple boilers to be linked together to provide efficient heating for larger buildings. By employing multiple heating units, the system can respond more effectively to varying heating demands, resulting in reduced energy consumption and increased efficiency.

Energy efficiency is a standout characteristic of the LGB-4 and LGB-5. Both models are designed with advanced combustion technology, ensuring optimal fuel utilization and lower emissions. The cast iron construction not only provides durability but also excellent thermal mass, helping to maintain steady temperature control while reducing fuel costs. The optional low-NOx burners further minimize environmental impact, adhering to stringent emissions regulations.

Another innovative feature is the built-in venting options that allow for flexibility in installations. These boilers can be vented vertically or horizontally, providing versatile installation choices that can adapt to existing infrastructure.

The user-friendly control panel with integrated diagnostic capabilities simplifies operation and maintenance. Features such as a standard electronic ignition system reduce manual intervention, and the modulating burner promotes more precise control of the steam output.

In summary, the Weil-McLain LGB-4 and LGB-5 steam boilers provide a combination of durability, efficiency, and flexibility. With their modular design, advanced combustion technologies, and user-friendly controls, these boilers are well-suited for a variety of commercial and industrial heating needs, ensuring reliable performance and peace of mind for building managers and facility operators.
Top Page Image Contents