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GT INSTALLATION AND OPERATION INSTRUCTIONS

Understand and follow the plumbing requirements provided in this section. Keep serviceability in mind when installing plumbing around the boiler cabinetry. Install fi ttings that will allow the system to be fl ushed if needed during annual check-ups. Add an inhibitor to the system water to prevent lime and magnetite deposits from forming, and to protect the boiler from galvanic corrosion. A minimum clearance of 1 in, 25 mm must be maintained between heating system pipes and all combustible construction. All heating system piping must be supported by suitable hangers not the boiler. The thermal expansion of the system must be considered when supporting the system. A minimum system pressure of 12 psig, 84 kPa must be maintained.

Hot water boilers are designed to operate with airless water in the system. The GT boiler is provided with a 1/8 in, 3 mm, air vent located on the top of the unit. This air vent is intended to vent the boiler on initial startup. This device will NOT continuously vent air collecting in the primary loop and is not intended to be the primary venting device. The air scoop as shown in Figure 21 is the primary venting location. It is recommended that an additional air scoop be used in the secondary plumbing. If air continues to be a problem an air scrubber must be used.

NOTE: Only inhibited propylene glycol solutions should be used if freeze protection is required. Avoid using mixtures greater than 30%, unless the size of the boilers’ circulator(s) is increased accordingly. Under no circumstances should a 50% mixture be exceeded.

Pressure Relief Valve

Each boiler is equipped with a 30 psi pressure relief valve that must be piped in accordance with the ANSI/ ASME Boiler and Pressure Vessel Code, Section IV to prevent scalding of persons with hot liquid or vapor in the event of a discharge, see Figure 20.

Support the relief valve discharge piping to prevent strain on the valve body. Leave the open end of the relief valve discharge pipe visible for periodic inspection.

NOTE: The discharge pipe diameter must be the same at the relief valve output diameter. Never restrict the outlet relief valve.

WARNING: Never install any type of valve between the boiler and the relief valve or an explosion causing extensive property damage, severe personal injury or death may occur!

Figure 20 - Relief Valve Piping

Non ASME GT-150

All ASME Models

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Smith Cast Iron Boilers GT Series manual Pressure Relief Valve, Relief Valve Piping
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GT Series specifications

Smith Cast Iron Boilers GT Series has become a benchmark in the hydronic heating industry, renowned for its exceptional performance, durability, and efficiency. This series is designed to cater to diverse heating needs, making it a popular choice among both residential and commercial applications.

One of the standout features of the GT Series is its robust cast iron construction. The cast iron sections offer superior thermal mass, allowing for better heat retention and distribution. This characteristic ensures that the boiler operates efficiently, maintaining comfortable temperatures even during extreme cold weather conditions. The engineers at Smith have meticulously designed each section to provide maximum strength and longevity, resulting in a boiler that can withstand the test of time.

The GT Series also incorporates advanced combustion technology. It utilizes a high-efficiency burner that optimizes fuel consumption, resulting in lower operating costs for homeowners and businesses alike. The boiler is engineered to accommodate a variety of fuel types, including natural gas and propane, giving users flexibility in their energy choices. This adaptability not only enhances efficiency but also promotes environmental sustainability by allowing for the use of cleaner fuel sources.

Another notable technology featured in the GT Series is the electronic control system. This system simplifies boiler operation and enhances user convenience. The intuitive interface provides real-time feedback and diagnostics, making it easier for technicians to perform maintenance and troubleshoot any issues that may arise. Additionally, the boiler’s modulating operation adjusts the burner output according to the heating demand, further improving efficiency and comfort.

Moreover, the GT Series is designed with user-friendly installation in mind. Its compact footprint allows for easy integration into existing heating systems, minimizing space requirements. Additionally, the boiler is equipped with convenient access points for maintenance, ensuring that servicing is straightforward and can be performed without extensive downtime.

Lastly, the Smith Cast Iron Boilers GT Series is designed to meet stringent safety and performance standards. Featuring multiple safety controls and systems, it provides peace of mind for users. With a commitment to quality, efficiency, and performance, the GT Series stands out as a leading solution for hydronic heating, catering to the evolving needs of today’s energy-conscious consumers.
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