GOLD CGi-4E 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.

24

Part Number 550-110-711/1108

 

Page 23 Page 25
Page 24
Image 24
Weil-McLain CGI-4E 4d Piping low temperature systems, Primary/secondary preferred bypass piping method, Temperature gauges
Page 23 Page 25

CGI-4E specifications

The Weil-McLain CGI-4E is a standout in the realm of commercial boilers, designed to meet the rigorous demands of a variety of heating applications. This gas-fired cast iron boiler exemplifies durability, efficiency, and performance, making it a popular choice in various commercial settings, including schools, hospitals, and office buildings.

One of the main features of the CGI-4E is its cast iron construction. Cast iron has long been favored for its excellent heat retention and distribution capabilities, leading to improved overall efficiency. The boiler is designed to maximize heat output while minimizing energy consumption. This characteristic is especially beneficial for businesses seeking to lower their energy costs without sacrificing comfort.

In terms of efficiency, the Weil-McLain CGI-4E boasts an impressive thermal efficiency rating. Its design incorporates advanced technology, allowing it to achieve an AFUE rating of up to 84%. This efficiency is achieved through features such as a full-modulating burner and a unique heat exchanger design that allows for optimal heat transfer and reduced flue gas temperatures.

The CGI-4E is also remarkable for its versatility. It is offered in a variety of sizes, making it suitable for different heating loads. This flexibility allows for installation in a wide range of environments, adapting easily to both existing and new heating systems. Additionally, the boiler comes with multiple venting options, including direct vent and conventional venting, further enhancing its installation flexibility.

Another standout feature is the integrated boiler control system, which simplifies operation and monitoring. This control system optimizes burner performance and enhances safety features, including automatic shut-off in case of system anomalies. The advanced controls also allow for easy integration with building management systems, enabling better energy management and reduced operational costs.

The CGI-4E also emphasizes ease of maintenance, with service-friendly designs that allow technicians to access components without difficulty. This consideration translates to reduced downtime and lower maintenance costs, ensuring that the boiler operates efficiently over its lifetime.

Overall, the Weil-McLain CGI-4E blends reliability, efficiency, and advanced technology, making it a premier choice for commercial heating needs. Its cast iron construction, impressive efficiency ratings, versatile installation options, and user-friendly controls solidify its reputation as a leading boiler solution in the industry.
Top Page Image Contents