Connect Water Piping

General piping information:

•If installation is to comply with ASME or Canadian requirements, an additional high temperature limit is needed. Install control in supply piping between boiler and isolation valve. Set control to a minimum of 20°F above set point of combination control. Maximum allowable set point is 220°F. Wire control as shown on wiring diagram.

•Use a low water cutoff device when:

—Boiler is installed above radiation level.

—Required by certain state or local codes or insurance companies.

Use low water cutoff designed for water installations. Probe-type is recommended. Purchase and install in tee in supply line above boiler.

•Use backflow check valve in cold water supply as required by local codes.

•“A2” or “A3” tapping not recommended for system supply piping. If “A2” or “A3” tapping must be used, adequate air elimination method must be provided.

Install piping:

•See FIGURE 7 or 8 on page 13 and Water Piping Size Table at right for near-boiler piping and single-zone piping. See page 14 to complete multiple-zone piping or page 15 to complete piping for systems operating below 140°F.

For multiple-boiler piping, refer to Weil-McLain’s “Primary/Secondary Piping Guide."

•Install relief valve vertically in “R” tapping

on back of boiler. See FIGURE 7 or 8 and also refer to tag attached to relief valve for manufacturer’s instructions.

Pipe relief valve discharge line near floor close to floor drain to

eliminate potential of severe burns. Do not pipe to any area where freezing could occur. Do not plug, valve or place any obstruction in discharge line.

DIAPHRAGM expansion tank (FIGURE 7):

•Make sure expansion tank size will handle boiler and system water volume and temperature. Tank must be located near boiler before inlet to circulator. See tank manufacturer’s instructions for details.

Undersized expansion tanks cause system water to be lost from relief

valve and makeup water added through fill valve. Eventual section failure can result.

•Install automatic air vent in “A2” tapping as shown in FIGURE 7.

CLOSED expansion tank (FIGURE 8):

•Ensure expansion tank size will handle boiler and system water volume and temperature.

Undersized expansion tanks cause system water to be lost from relief

valve and makeup water added through fill valve. Eventual section failure can result.

•Connect tank from “A2” tapping shown in FIGURE 8 to expansion tank. Use 1¼2 " N.P.T. piping. Pitch any horizontal piping up towards tank 1 inch per 5 feet of piping.

WATER PIPING SIZE TABLE*

BOILER

 

 

MODEL

TO

FROM

NUMBER

SYSTEM

SYSTEM

 

 

 

SGO-3W

1¼"

1¼"

SGO-4W

1¼"

1¼"

 

 

 

SGO-5W

1½"

1½"

 

 

 

SGO-6W

1½"

11¼2"

SGO-7W

1½"

1½"

 

 

 

SGO-8W

2"

2"

 

 

 

SGO-9W

2"

2"

 

 

 

*All piping sizes based on 20°F temperature rise through boiler.

12

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Weil-McLain 550-141-827/1201 manual Connect Water Piping, General piping information, Install piping
Page 11 Page 13

SGO-W SERIES 3 OIL-FIRED NATURAL DRAFT WATER BOILER, 550-141-827/1201 specifications

The Weil-McLain SGO-W Series 3 Oil-Fired Natural Draft Water Boiler is a robust and efficient solution designed for residential heating needs. This boiler stands out for its exceptional construction and advanced engineering, ensuring reliability and longevity for homeowners.

One of the core features of the SGO-W Series 3 is its cast iron heat exchanger, which provides excellent thermal efficiency. The boiler is designed to retain heat for extended periods, allowing for reduced energy consumption and lower heating bills. The heavy-duty cast iron sections are built to withstand high pressures and temperatures, ensuring durability in various conditions.

The SGO-W Series 3 is equipped with a natural draft design, allowing it to utilize the natural upwards movement of flue gases. This design eliminates the need for complicated power venting systems, making installation simpler and more cost-effective. It also enhances the boiler's efficiency by promoting better combustion processes in the burner.

Another significant characteristic is its versatile fuel options. The SGO-W Series 3 accommodates No. 2 fuel oil, making it a viable option for users who prefer or require oil heating. This versatility is crucial for homeowners in areas where natural gas is not available or preferred.

The boiler operates at a high efficiency rate, contributing to lower emissions and compliance with environmental standards. Its energy-efficient design not only benefits the environment but also allows for significant savings over time. The unit is also equipped with a reliable and easily adjustable fuel burner, providing flexibility in managing heating output to suit various residential heating demands.

For safety and convenience, the Weil-McLain SGO-W Series 3 features an electronic ignition system that ensures reliable starting and operation, even in adverse weather conditions. Additionally, the boiler is designed for easy serviceability, with accessible components allowing for quick maintenance and repairs, ensuring that homeowners can rely on continual performance and minimal downtime.

In summary, the Weil-McLain SGO-W Series 3 Oil-Fired Natural Draft Water Boiler is a powerful and efficient heating solution, combining advanced technologies with robust construction. Its cast iron heat exchanger, natural draft design, fuel flexibility, high efficiency, and convenient features make it an excellent choice for residential heating applications, supporting homeowners' comfort and reducing energy costs.
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