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

Pipe tankless heaters

Hot water can scald!

Consumer Product Safety Commission and some states recommend domestic hot water tempera- ture of 130°F or less.

When installing an automatic mixing valve, se- lection and installation must comply with valve manufacturer's recommendations and instruc- tions.

Water heated to a temperature suitable for clothes washing, dish washing and other sanitizing needs will scald and cause injury.

Children, elderly, infirm or physically handi- capped persons are more likely to be injured by hot water. Never leave them unattended in or near a bathtub, shower or sink. Never allow small children to use a hot water faucet or draw their own bath. If anyone using hot water in the building fits this description, or if state laws or local codes require certain water temperatures at hot water faucets, take special precautions:

—Install automatic mixing valve set according to those standards.

—Use lowest practical temperature setting.

—Check water temperature immediately after first heating cycle and after any adjustment.

Part No. 550-100-068/0308

To pipe tankless heaters:

1.See Figure 35.

2.Size piping no smaller than heater inlet and out- let.

3.Automatic mixing valve must be installed. See Figure 35. Follow manufacturer's instructions to install.

4.Flow regulating valve must be installed. Size accord- ing to continuous draw of heater. See Figure 34. Follow manufacturer's instructions to install.

5.Operating control with small adjustable differen- tial scale is recommended. Install in temperature control tapping in heater plate.

6.Multiple tankless heaters (see Figure 35):

a.Use cold water supply header with individual risers to each heater. Size header by increasing one pipe size for each additional heater.

b.Use hot water outlet header with individual risers to each heater. Size header by increasing one pipe size for each additional heater.

c.Do not pipe multiple heaters in series.

7.In hard water areas, soften cold domestic water supply to heaters to prevent lime build-up.

Figure 34 Tankless heater ratings (Weil-McLain ratings)

Heater

Intermittent

Continuous

Inlet and

number

draw – GPM

draw GPM

outlet tappings

 

(note 2)

(notes 1, 2)

 

 

 

 

 

820

8.5

6.5

¾"

Note 1

GPM based on 40–140°F DHW with boiler water

at 200°F

 

 

 

 

 

Note 2

Based on continuous draw with no recovery period

Figure 35 Tankless Heater Piping

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Weil-McLain 88 manual Pipe tankless heaters, To pipe tankless heaters, Hot water can scald
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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.
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