SECTION VIII: COMBUSTION AIR AND VENT SYSTEM

COMBUSTION AIR AND VENT SAFETY

This Category IV, dual certified direct vent furnace is designed for resi- dential application. It may be installed without modification to the con- densate system in a basement, garage, equipment room, alcove, attic or any other indoor location where all required clearance to combusti- bles and other restrictions are met. The combustion air and the venting system must be installed in accordance with Section 5.3, Air for Com- bustion and Ventilation, of the National Fuel Gas Code Z223.1/NFPA 54 (latest edition), or Sections 7.2, 7.3 or 7.4 of CSA B149.1, National Gas and Propane Codes (latest edition) or applicable provisions of the local building code and these instructions.

The “VENT SYSTEM” must be installed as specified in these instructions for Residential and Non HUD Modular Homes. The direct vent system is the only configuration that can be installed in a Non HUD Modular Home.

This furnace may not be common vented with any other appliance, since it requires separate, properly sized air intake and vent lines. The furnace shall not be connected to any type of B, BW or L vent or vent connector, and not connected to any portion of a factory- built or masonry chimney

The furnace shall not be connected to a chimney flue serving a sep- arate appliance designed to burn solid fuel.

When combustion air pipe is installed above a suspended ceiling or when it passes through a warm and humid space, the pipe must be insulated with 1/2” Armaflex or other heat resistant type insulation if two feet or more of pipe is exposed.

Vent piping must be insulated if it will be subjected to freezing tem- peratures such as routing through unheated areas or through an unused chimney.

COMBUSTION AIR/VENT PIPE SIZING

The size of pipe required will be determined by the furnace model, the total length of pipe required and the number of elbows required.

Table 7, "Maximum Equivalent Pipe Length" lists the maximum equiva- lent length of pipe allowed for each model of furnace. The equivalent length of elbows is shown in Table 9, "Equivalent Length of Fittings". The equivalent length of the vent system is the total length of straight pipe PLUS the equivalent length of all of the elbows.

The following rules must also be followed:

1.Long radius (sweep) elbows are recommended. Standard elbows may be used, but since they have a longer equivalent length, they will reduce the total length of pipe that will be allowed. Short radius (plumbing vent) elbows are not allowed. The standard dimensions of the acceptable elbows are shown below.

2.The maximum equivalent length listed in Table 7, "Maximum Equivalent Pipe Length" is for the vent piping and the air intake piping separately. For example, if the table allows 65 equivalent feet for a particular model, then the vent can have 65 equivalent feet of pipe, AND the combustion air intake can have another 65 equivalent feet of pipe.

3.Three vent terminal elbows (two for the vent and one for the com- bustion air intake) are already accounted for and need not be included in the equivalent length calculation.

364861-UIM-B-0708

4.All combustion air and vent pipe must conform to American National Standards Institute (ANSI) and American Society for Test- ing and Materials (ASTM) standards D1785 (Schedule 40 PVC), D2665 (PVC-DWV), F891 (PVC-DWV Cellular Core), D2261 (ABS-DWV) or F628 (Schedule 40 ABS). Pipe cement and primer must conform to ASTM Standard D2546 (PVC) or D2235 (ABS). If ABS pipe is to be used, any joint where ABS pipe is joined to PVC pipe must be glued with cement that is approved for use with BOTH materials. Metallic materials must not be used for venting or air intake.

5.If a flexible connector is used in the vent system, it must be made of a material that is resistant to acidic exposure and to at least 225° F temperature. Flexible connectors are also allowed in the combustion air pipe.

6.All models are supplied with 2" vent connections. When the pipe must be increased to 3" diameter, the transition from 2" to 3" must be done as close to the furnace as possible. For upflow models, the transition from 2" to 3" should be done immediately above the furnace. For downflow or horizontal models, the transition from 2" to 3" pipe should be done immediately after exiting the furnace.

7.In Canada, vents shall be certified to ULC S636, Standard for Type BH Gas Venting Systems. IPEX System 636 PVC is certified to this standard.

8.In Canada, the first three feet (900 mm) of the vent must be readily accessible for inspection.

9.For single pipe systems it is recommended to install the combus- tion air coupling provided and install approximately 18” of PVC pipe on the furnace.

10.Minimum vent length for all models is 5 feet.

TABLE 7: Maximum Equivalent Pipe Length

Model Input

 

 

 

 

 

 

 

Pipe Size

 

 

Maximum

 

 

 

 

 

 

 

 

Equivalent

BTUH (kW)

 

 

 

 

 

 

 

Inches (cm)

 

 

 

 

 

 

 

 

 

length feet (m)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40,000 (11.7)

 

 

 

 

 

 

 

2 (5.1)

 

 

 

 

65 (19.8)

40,000 (11.7)

 

 

 

 

 

 

 

3 (7.6)

 

 

 

 

90 (27.4)

60,000 (17.6)

 

 

 

 

 

 

 

2 (5.1)

 

 

 

 

65 (19.8)

60,000 (17.6)

 

 

 

 

 

 

 

3 (7.6)

 

 

 

 

90 (27.4)

80,000 (23.4)

 

 

 

 

 

 

 

2 (5.1)

 

 

 

 

65 (19.8)

80,000 (23.4)

 

 

 

 

 

 

 

3 (7.6)

 

 

 

 

90 (27.4)

100,000 (29.3)

 

 

 

 

 

 

 

2 (5.1)

 

 

 

 

30 (9.2)

100,000 (29.3)

 

 

 

 

 

 

 

3 (7.6)

 

 

 

 

90 (27.4)

120,000 (35.1)

 

 

 

 

 

 

 

2 (5.1)

 

 

 

 

30 (9.2)

120,000 (35.1)

 

 

 

 

 

 

 

3 (7.6)

 

 

 

 

90 (27.4)

130,000 (38.1)

 

 

 

 

 

 

 

3 (7.6)

 

 

 

 

85 (25.9)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A

 

 

 

 

 

 

 

 

 

 

 

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A

 

 

 

 

 

 

 

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

STANDARD ELBOW

 

LONG (SWEEP) ELBOW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FIGURE 27: Dimensions

 

 

 

 

 

 

 

 

 

 

 

 

TABLE 8: Elbow Dimensions

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Elbow

 

"A" Dimension

 

 

 

 

 

 

 

 

 

2" Standard

 

2-5/16"

 

 

 

 

 

 

 

 

 

 

 

 

3" Standard

 

3-1/16"

 

 

 

 

 

 

 

 

 

 

 

 

2" Sweep

 

3-1/4"

 

 

 

 

 

 

 

 

 

 

 

 

3" Sweep

 

4-1/16"

 

 

 

 

 

 

 

 

 

 

 

 

Dimensions are those required in Standard ASTM D-3311.

Johnson Controls Unitary Products

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Johnson Controls GG9S*MP, TG9S*MP Section Viii Combustion AIR and Vent System, Combustion AIR and Vent Safety
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TG9S*MP, GG9S*MP specifications

Johnson Controls has long been at the forefront of building efficiency solutions, and their TG9S*MP and GG9S*MP series exemplify this commitment. These two-stage, multi-position gas furnaces are designed for optimal comfort and performance in residential applications, and they come packed with a variety of features that enhance their efficiency and operational capabilities.

One of the standout features of the TG9S*MP and GG9S*MP furnaces is their efficient two-stage operation. This technology allows the unit to operate at a lower capacity most of the time, which translates into reduced energy consumption and costs. When the demand for heating increases, the furnace automatically shifts to a higher capacity, ensuring a consistent and comfortable indoor temperature. This flexibility not only enhances comfort but also extends the lifespan of the unit as it doesn't have to work harder than necessary.

Energy efficiency is a crucial characteristic of both models. With an Annual Fuel Utilization Efficiency (AFUE) rating of up to 96%, these furnaces convert a significant amount of the fuel they consume into usable heat. Such efficiency ratings not only help in reducing energy bills but also have a positive impact on the environment by minimizing greenhouse gas emissions.

Both models feature advanced technology in their design, including a fully modulating gas valve and a variable-speed blower motor. The modulating valve adjusts the gas flow in response to the thermostat’s signals, allowing for precise temperature control and improved comfort. Meanwhile, the variable-speed blower motor enhances airflow while operating quietly, significantly improving overall indoor air quality by promoting even heat distribution throughout the home.

From a structural standpoint, the TG9S*MP and GG9S*MP are built with durable materials designed for longevity. Their compact design allows for flexible installation options, whether in a closet, attic, or basement. The furnaces also come equipped with a robust heat exchanger crafted from high-quality materials, which ensures both reliability and efficiency.

In conclusion, the Johnson Controls TG9S*MP and GG9S*MP furnaces provide homeowners with efficient, reliable, and comfortable heating solutions. With advanced features such as two-stage operation, impressive AFUE ratings, and modern technology integrations, these models stand out in the market as dependable options for both energy savings and year-round comfort. Whether you're a homeowner looking to upgrade your heating system or a contractor seeking high-quality products for your clients, these furnaces represent a smart choice.
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