GOLD CGi Gas-Fired Water Boiler — Boiler Manual

4d Piping — low temperature systems

Primary/secondary (preferred) bypass piping method

Primary/secondary bypass piping is preferred because the flow rate and temperature drop in the heating circuit(s) is determined only by the heating circuit circulator(s). So adjustment of the bypass valves in the boiler circuit will not cause a change in the heating circuit rate and temperature distribution.

Figures 20 and 21 show suggested bypass arrangements using primary/secondary bypass piping (preferred) for low temperature systems such as radiant heating systems or converted gravity systems. For alterna- tives, see pages 26 through 29.

The bypass valves (items 7a and 7b) provide mixing of hot boiler outlet water with cooler system return water

—set to assure a minimum return water temperature (at least 130°F) to the boiler. Set the valves as explained below.

Temperature gauges

Gauge 4a is suggested, but optional on any system.

Gauge 4b is optional on converted gravity systems, but required on radiant heating systems — to display

the water temperature being supplied to the radiant tubing.

Gauge 8 is required on all systems to assure the return water temperature is accurately set for a minimum of 130°F. If this gauge is not available however, adjust the valves such that the boiler-mounted temperature/pres- sure gauge reads at least 150°F when the system return water is cold (approximately 60°F water temperature).

Valve adjustment

(Figures 20 and 21 only)

1.Set the valves while the system is cool, setting for the coldest expected water temperature (usually 60°F since the system will often drop to room tempera- ture between cycles).

2.Start with valve 7a fully closed and 7b fully open.

3.Gradually open valve 7a while closing valve 7b until the temperature at gauge 8 reads 130°F when gauge 4a reads 60°F.

4.Note that valve 7a regulates the amount of hot wa- ter from the boiler supply which mixes with return water.Valve 7b regulates the amount of system water flowing through the boiler secondary loop.

Failure to prevent low return water temperature to the boiler could cause corrosion of the boiler sections or burners, resulting in severe personal injury, death or substantial property damage.

Radiant heating system piping should include a means of regulating the boiler return water temperature and the system supply temperature (such as provided by an injec- tion pumping control).

Boiler return water temperature will be adequately controlled using the methods shown in this manual provided the system supply temperature is relatively constant.

DO NOT apply the methods of this manual if the system is equipped with an outdoor reset control. Instead, provide controls and piping which can regulate the boiler re- turn water temperature at no less than 130°F regardless of system supply temperature. Contact your Weil-McLain representative for suggested piping and control methods.

Failure to prevent cold return water temperature to the boiler could cause corrosion damage to the sections or burners, resulting in possible severe personal injury, death or substantial property damage.

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Part Number 550-110-710/0107

 

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Weil-McLain Series 2 4d Piping low temperature systems, Primary/secondary preferred bypass piping method, Valve adjustment
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Series 2 specifications

The Weil-McLain Series 2 is a highly regarded boiler system known for its robustness, efficiency, and ease of installation. Designed primarily for residential and light commercial applications, the Series 2 boasts a variety of features that cater to diverse heating needs.

One of the standout characteristics of the Series 2 is its cast iron construction, which provides durability and longevity. Cast iron is well-suited for heat retention, allowing the boiler to operate more efficiently and deliver consistent warmth. The Series 2 is available in multi-fuel options, accommodating both natural gas and propane, making it versatile for various installations.

Efficiency is a key feature of the Weil-McLain Series 2, with annual fuel utilization efficiency (AFUE) ratings that meet or exceed industry standards. This ensures that homeowners can enjoy not only a comfortable living environment but also reduced energy bills. The Series 2 is designed to provide optimal performance, minimizing fuel consumption while maximizing heat output.

Another innovative aspect of the Series 2 is its user-friendly control system. Equipped with advanced controls, the boiler allows for precise temperature management and can easily be integrated with existing heating systems. This adaptability is crucial for ensuring that the boiler matches the specific heating demands of any space, increasing overall comfort levels.

Installation is straightforward, thanks to the boiler's thoughtful design. The Series 2 features a compact footprint, allowing for flexible placement in various settings. Additionally, Weil-McLain provides comprehensive documentation and customer support, making it easier for technicians to install and maintain the system.

The Series 2 also includes features aimed at ease of maintenance. Its clean-out ports facilitate quick access for servicing, ensuring that the boiler remains in peak operating condition throughout its lifespan. Weil-McLain’s commitment to quality means users can expect reliable performance year after year.

Overall, the Weil-McLain Series 2 stands out as an excellent choice for those seeking a dependable, efficient, and straightforward heating solution. Its combination of durable construction, high efficiency, and user-centric design makes it a leading option in the boiler market, appealing to both homeowners and professionals alike. Whether for a new installation or a replacement, the Series 2 is poised to deliver exceptional heating performance.
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