Weil-McLain 88 Manual: Hartford Loop Piping for Steam Boilers

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

Connect steam boiler piping

Improperly piped systems or undersized piping can contribute to erratic boiler operation and possible boiler or system damage. Piping system must be installed as shown, using pipe sizes shown. Pipe sizes shown are for two-pipe, pumped-return systems. Adjust pipe sizing as needed when connecting to gravity-return systems. Consult local Weil-McLain distributor or sales office before installing alternate piping.

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Figure 23 Model 488 through 688 steam (1 riser)

Steam boiler piping guidelines

Minimum height of header above water line must be 24 inches

The boiler header must always be at least 24 inches above the water line, as shown in all steam boiler piping diagrams. Installing the pipe lower will result in increased water carryover to the system, resulting in potential seri- ous damage to system components and oxygen corrosion due to excess make-up water.

Hartford loop piping for all steam boilers

1.You must install the system supply pipe between the equalizer elbow and the last boiler riser pipe connection to the header. This assists in separating water from the steam as it turns upward into the steam supply pipe.

2.Locate the top of the Hartford loop return nipple at least 4 inches below the water line, as shown.

Figure 24 Model 788 through 1188 steam (2 risers required)

Drawing legend & notes

(Figure 23 through Figure 26)

1Riser pipes (one for each supply intermediate section)

2Horizontal pipes needed to offset the header to allow for expansion and contraction of the header

3Steam supply must be located between last riser connection and equalizer elbow

4Equalizer elbow — full size or reducing

5Equalizer pipe

6Close nipple at Hartford loop tee to reduce water hammer potential

7Condensate return line (gravity or pumped)

8Minimum 4 inches between water line and top of Hartford loop return nipple

9Boiler water line — all automatic water level controls must be set to maintain this level

10Minimum 24 inches between water line and bottom of header

Part No. 550-100-068/0308

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.