Recirculation

AQUA PLUS indirect-fired water heaters — Product Manual

Massachusetts code applications require recircu- lation piping or heat-traced piping if the distance from the water heater to the furthest fixture exceeds 100 feet.

Maintaining domestic water temperature in the supply piping

1.Recirculation is used to reduce wait time for water use, to minimize hot water and energy waste caused during the waiting period, and to prevent degradation of the system supply water temperature. ASPE recommends recirculation when the distance from the water heater to the furthest fix- ture exceeds 100 feet or the time lag for hot water to reach a fixture(s) exceeds 30 seconds.

2.Consult local codes and American Society of Plumbing Engineers (ASPE) Domestic Water Heating Design Manual, 1998, for further information.

Time delay at fixtures

1.Figure 4, page 9 is from the ASPE Domestic Water Heating Design Manual, 1998. It shows the time required for usable hot water to arrive at a fixture based on the fixture flow rate (available from industry and manufacturer’s data) and the length and diameter of the dead-end branch pipe supplying the fixture.

2.The time lag should generally not exceed 30 seconds.

3.For residential and office applications, the owner may prefer a limit of 10 seconds.

4.You can use Figure 4 as a guide to determining the location of circulation return lines relative to fixtures.

Balancing

1.When multiple branches are connected to the supply pip- ing, each branch must be connected to the recirculation system.

a.At each of these connections to the return piping, install shutoff valves, a flow metering device, check valve and a strainer as shown in Figure 5, page 9.

b.Check local codes for specific installation require- ments.

2.These branches must be balanced to prevent pipe erosion and unacceptable time delays at some fixtures.

3.Balancing options include circuit setters, memory stop valves or factory preset devices (with flow metering provision in the piping).

Components required

1.For residential applications, consult circulator manufacturer’s data for circulator selection and additional components required.

2.On most commercial systems, install the devices shown in Figure 5, page 9, and any other devices or piping methods required by local codes.

a.The check valves are required to prevent fixtures from taking hot water through the return lines.

b.Shutoff valves are needed to allow cleaning and replacing balancing devices.

c.Include strainers to remove sediment which could damage the circulator and / or affect the flow balancing devices.

3.Size the circulator and piping based on the temperature drop allowed between the water available at the water heater and the water delivered at the fixture.

a.The return piping will almost always be smaller than the supply piping, but should never be smaller than ½” to prevent problems with the circulator.

4.Make provision for removal of air in all return lines. Where the returns cannot be vented by topmost fixtures in the system, install automatic air venting at the top of the return piping.

Connecting to the water heater

1.Install the domestic water components as shown in Fig- ure 2, page 6.

2.See Figure 6, page 10 for the piping required to the water heater.

—Continued on page 10 —

Part number GL-E223-ADOC 0311

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.

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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.

Weil-McLain GL-E223-ADOC 0311 manual Recirculation

Models: GL-E223-ADOC 0311