GT INSTALLATION AND OPERATION INSTRUCTIONS

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The GT condensing gas boiler is a high efficiency boiler utilizing induced power venting. It is designed to be vented directly to the outdoors using the venting methods and materials detailed in this section. The vent system must be both gas tight and watertight. All horizontal vent piping must be sloped back to the boiler a minimum of 1/4 in/ft, 21mm/m of vent.

NOTE: Steps must be taken to ensure that condensate does not collect in the venting system or the boiler will not operate properly.

This boiler may be vented using the following materials, but local codes must be followed:

•GT150 & 200: 3 in, 76 mm, PVC Sch.40 solid core pipe, CPVC Sch.40 pipe, AL29-4C Flex Stainless Vent or AL29-4C Rigid Stainless Vent.

•GT-400: 4 in, 102 mm or 6 in, 152 mm, PVC Sch.40 solid core pipe, CPVC Sch.40 pipe, AL29-4C Flex Stainless Vent or AL29-4C Rigid Stainless Vent.

CAUTION: All vent systems must be fully supported by the building structure. The vent connection and vent piping MUST be perfectly aligned to the boiler connection, Figure 3. It MUST NOT APPLY ANY WEIGHT OR LATERAL FORCE TO THE FLUE BOX or the flue box will be damaged voiding the warranty!

Appropriate adapters must be used to increase the 2 in, 51 mm vent collar to 3 in, 76 mm at the boiler, GT-150 & 200, Figure 3. On the GT-400 the 4 in, 102 mm long 4 inch diameter ABS pipe provided with the boiler must be inserted into the exhaust connection on the top of the boiler and tightened in place with the supplied clamp.

Figure 3- Vent Pipe To Boiler Attachment

The maximum combined equivalent vent and intake pipe lengths are listed in Table 2. The length specifi ed is the equivalent vent length added to the equivalent intake length.

Table 2 - Vent & Air Intake System Sizing

Model

Equivalent Combined Vent & Air Intake

Number

System Length (see note)

GT-150

105 ft, 32 m

GT-200

105 ft, 32 m

GT-400

4" - 30 ft, 9 m

6" - 65 ft, 20 m

PGT-150

50 ft, 15 m

PGT-200

50 ft, 15 m

PGT-400

4" - 30 ft, 9 m

6" - 65 ft, 20 m

Note: Subtract 5 ft, 1.5 m, for each 90° elbow except for the vent and air intake elbows. These don’t need to be considered. The length of the air inlet system must never exceed the length of the vent system. The vent system length may exceed the air inlet system length by no more than 20 equivalent ft, 6.1 equivalent m.

HORIZONTAL

DIRECT VENT SYSTEMS

Read the information in the GENERAL VENTING GUIDELINES section. It is recommended that two elbows be used, so that the 1/4 in/ft, 21mm/m slope of the horizontal vent system does not affect the vertical plumb of the pipe connected to the boiler, Figure 4.

Figure 4 - Vent System Attachment

When horizontal vent runs exceed 5 ft, 1.5m, they must be supported at 3 ft, 0.9 m, intervals with overhead hangers, 4 ft, 1.2 m for 6" pipe. The vent system must be pitched down, toward the boiler, 1/4 in/ft, 21mm/m. of vent. Structural penetrations must be made using approved thimbles.

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Smith Cast Iron Boilers GT Series manual Horizontal Direct Vent Systems
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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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