AQUA PLUS indirect-fired water heaters — Product Manual

Connecting to a low-pressure steam boiler

Special considerations

When designing steam and domestic hot water systems, there are some key issues that must be taken into consideration during the initial de- sign phase. By designing the system properly from the start, you can avoid problems and have a hot water loop in a steam boiler system.

•The domestic water demand should preferably not exceed 1/3 of the steam boiler capacity. Larger demand may cause difficulty obtaining steam as needed.

•Keep the loop temperature below the flash point. Flashing can result in noise and circulator damage or shortened life.

•Be sure the loop is completely closed, with no automatic or manual air vents, or anything that could allow air to enter the system when the pump shuts off.

•Pipe supply from one side of the boiler, return to the opposite side as shown.

•Supply from a tapping that is high enough to prevent introducing sediment into the piping and circulator yet still below the water line. Avoid the mud leg of the boiler.

•Use an all bronze circulator.

•Avoid wet rotor circulators. Select a circulator with a large volute, such as a typical 3-piece circulator.

•This will reduce clogging and will resist the corrosion potential from the steam condensate.

•Make sure the circulator is properly sized. If the circulator runs too far out on its curve, cavitation potential increases significantly.

•Use (2) flow / check valves as shown to reduce the potential for gravity circulation.

•DO NOT use spring-loaded check valves in place of the flow / check valves shown in Figure 16, page 19.

Installation and start-up of water heaters connected to steam boilers

1.See Figure 16, page 19, for suggested piping schematic.

2.Pipe the domestic water connections to the water heater per “Do- mestic water piping,” page 6.

Boiler connections for the water heater must be below the water line. DO NOT use the gauge glass tapping or a low water cut-off tapping if a LWCO is installed there.

For steam piping, refer to the steam boiler manual.

DO NOT install an air vent anywhere in the piping. The piping must be air tight.

3.Wire the water heater and circulator to the boiler per suggested wiring in Figure 15. The water heater must be wired and ready to operate before proceeding. Note that the L4006A aquastat is located in the boiler and sets a boiler operating temperature when there is no call for steam heating.

To fill the boiler and water heater:

1.Follow the procedure given in Figure 16, page 19 to fill the water heater piping.

2.Follow the boiler manual instructions to fill the steam boiler.

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Figure 15 Typical wiring for connection to low- pressure steam boiler

Install the Honeywell L4006A aquastat in the boiler, be- low the water line. Set for a temperature of 180 to 190°F to control boiler temperature when there is no call for steam heating.

Valve 7, the memory stop valve, must be supplied, piped and adjusted as in- structed. This valve allows cooler return water to mix with the hot water from the steam boiler. The valve is set to yield approximately 180°F water entering the circulator. Higher temperature water could cause cavitation in the circulator, damaging the impeller and shortening circulator life.

DO NOT connect the piping to the boil- er’s mud leg. This would probably cause excessive sediment to enter the water heater piping, damaging the circulator.

The strainer in the circulator suction line must be serviced regularly. NOTE that noise from the circulator is a likely sign that the strainer is restricting circulator flow, causing cavitation.

Part number GL-E223-ADOC 0311

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Weil-McLain GL-E223-ADOC 0311 manual Connecting to a low-pressure steam boiler, Special considerations
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GL-E223-ADOC 0311 specifications

The Weil-McLain GL-E223-ADOC 0311 is a notable addition to the lineup of high-efficiency cast iron boilers designed for both residential and commercial applications. This model stands out due to its focus on reliability, longevity, and energy efficiency, making it an ideal solution for those seeking effective heating solutions.

A key feature of the GL-E223 model is its durable cast iron construction. The cast iron heat exchanger not only enhances the boiler's overall resilience but also improves its thermal efficiency. This characteristic ensures the boiler can withstand the stress of continuous operation while providing consistent heating performance year after year.

The GL-E223-ADOC 0311 employs advanced burner technology, which optimizes combustion efficiency, reducing fuel consumption. With its ability to modulate based on the heating demand, the boiler adjusts its output to ensure it runs at peak efficiency, minimizing energy waste. This feature is particularly beneficial in terms of energy savings and reducing operational costs over time.

In terms of sizing, the Weil-McLain GL-E223 model is engineered to provide adequate heating for a wide range of applications. Its output capacity is meticulously designed to accommodate residential heating requirements while being robust enough for light commercial usage. The controls and monitoring systems integrated into this boiler allow for easy adjustments and improved system management.

One significant characteristic of this model is its built-in features for enhanced safety and convenience. The boiler includes safety controls that prevent overheating, as well as an easy-access inspection and cleaning configuration that extends the life of the unit and eases maintenance efforts.

Furthermore, the GL-E223-ADOC 0311 is designed to be compatible with a range of hydronic heating systems. This adaptability allows for seamless integration into existing infrastructure or new installations, allowing homeowners and businesses the potential for improved heating solutions without extensive modifications.

Overall, the Weil-McLain GL-E223-ADOC 0311 encompasses advanced engineering with its cast iron construction, efficient burner technology, and user-friendly features that ensure reliability and efficiency. Whether for new installations or upgrades, this boiler is a solid choice for efficient heating solutions, resonating well with those prioritizing energy conservation and long-term performance.
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