GOLD CGi-4E Gas-Fired Water Boiler — Boiler Manual

5 Gas piping

Connecting gas supply piping to boiler

1.Remove jacket front panel and refer to Figure 26 to pipe gas to boiler.

a.Install drip leg at inlet of gas connection to boiler. Where local utility requires drip leg to be extended to the floor, use appropri- ate length of pipe between cap and tee.

b.Install ground joint union for servicing, when required.

c.Install manual shutoff valve in gas supply piping outside boiler jacket when required by local codes or utility requirements.

d.In Canada — When using manual main shutoff valve, it must be identified by the installer.

2.Support piping with hangers, not by boiler or its accessories.

3.Purge all air from gas supply piping.

4.Before placing boiler in operation, check boiler and its gas connection for leaks.

a.Close manual main shutoff valve during any pressure testing at less than 13” w.c.

b.Disconnect boiler and gas valve from gas supply piping dur- ing any pressure testing greater than 13” w.c.

Do not check for gas leaks with an open flame — use bubble test. Failure to use bubble test or check for gas leaks can cause severe personal injury, death or substantial property damage.

5.Use pipe dope compatible with propane gases. Apply sparingly only to male threads of pipe joints so that pipe dope does not block gas flow.

Failure to apply pipe dope as detailed above can result in severe personal injury, death or substantial property damage.

Natural Gas:

1.Refer to Table 7 for pipe length and diameter. Base on rated boiler input (divide by 1,000 to obtain cubic

feet per hour). Table 7 is only for gas with specific gravity 0.60, with a pressure drop through the gas piping of 0.30” w.c. For additional gas pipe sizing information, refer to ANSI Z223.1 (or B149.1 or B149.2 for Canadian installations).

2.Inlet pressure required at gas valve inlet:

•Maximum: 13” w.c.

•Minimum: 5” w.c.

•Manifold gas pressure: 3.50” w.c. at high fire (0.90” w.c. while in low fire at start-up)

3.Install 100% lockup gas pressure regulator in supply line if inlet pressure exceeds 13” w.c. Adjust for

13” w.c. maximum.

Propane Gas:

1.Contact gas supplier to size pipes, tanks and 100% lockup gas pressure regulator.

2.Adjust propane supply regulator provided by gas supplier for 13” w.c. maximum pressure.

3.Inlet pressure required at gas valve inlet:

•Maximum: 13” w.c.

•Minimum: 11” w.c.

•Manifold gas pressure: 10” w.c. at high fire (3.50” w.c. while in low fire at start-up)

Table 7  Pipe capacity for 0.60 specific gravity natural gas

Figure 26  Gas supply piping

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Part Number 550-110-711/1108

 

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Weil-McLain CGI-4E manual Gas piping, Connecting gas supply piping to boiler, Natural Gas, Propane Gas
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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.
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