(note 1)

Weil-McLain 88 Water and steam boilers — Series 2 — for Gas, Light Oil, & Gas/Light Oil-Fired Burners

Connect water boiler piping

General water piping information

Figure 14 Water boiler piping, typical

1.System water supply and return piping should be installed and piping connections attached to boiler before erecting jacket or installing controls.

2.Do not pipe in through supply and out through return. This creates reverse water flow through boiler that must not be used.

3.When installing in a system in which return water temperature can drop below 140°F, apply the by-pass piping with by-pass pump as shown in .

Install piping

Install piping as shown in Figure 14, page 14 and Figure 18, page 15 (if applicable) for single boilers. For multiple boilers, see Fig- ure 19, page 15.

Improperly piped systems or undersized piping can contribute to erratic boiler operation and possible boiler or system damage.

1.Connect supply and return piping: a. Size according to tables below.

For known flow rates or higher flow rate (less than 20°F temperature rise) through boiler, see Figure 15.

For unknown flow rates, size piping per Figure 17, page page 15, using 20°F temperature rise through boiler.

Flow at higher rates than shown in the tables in this manual for given pipe sizes can damage the boiler, caus- ing substantial property damage.

b.Locate circulator in supply piping.

c.For return piping, use full diameter pipe for 10 times that diameter before making any reduction. For example, a 4-inch return should not be reduced any closer to boiler return tap- ping than 40 inches.

d.Install system blow-off (drain) valve in lowest part of return piping close to boiler. ASME minimum size requirements are given in Figure 17, page 15.

2.Install expansion tank:

a.Closed type – connect to 1" tapping "K" (see page 11). Use 1" NPT piping. Any horizontal piping must pitch up toward tank at least 1 inch per each 5 feet of piping.

b.Diaphragm type – Refer to tank manufacturer's literature for location. Install automatic air vent in "K" tapping.

c.Connect cold water fill to expansion tank piping. Figure 14 shows typical piping when using a closed type tank. Connect to the same location as the expansion tank connects to the system when using a diaphragm type tank.

d.Also shown are recommended valves and water meter, when used. Water meter will detect added make-up water, indicating leaks in system.

14

Figure 15 Recommended minimum pipe sizes for known flow rates

Water flow rate

Supply pipe size

Return pipe size

GPM

A

B

 

 

 

Up to 35

2"

2"

 

 

 

36–50

2½"

2½"

 

 

 

51–77

3"

3"

 

 

 

78–142

4"

4"

 

 

 

143–237

5"

5"

 

 

 

238–404

6" (note 2)

6"

 

 

 

Note 1 High temperature rise through boiler is permissible when boiler piping connections are sized per this table. Intermittent flow at high velocities may damage any boiler.

Note 2 6-inch piping requires nipples and 5" x 6" reducing couplings (provided with 1288 through 1888 boilers only). The total pressure drop through the 1888 boiler using the nipple and reducing coupling will not exceed ¼ PSI. For smaller boilers, the pressure drop will be less.

Part No. 550-100-068/0308

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Weil-McLain 88 manual Connect water boiler piping, General water piping information, Install piping

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.