364861-UIM-B-0708

TABLE 9: Equivalent Length of Fittings

Fitting

Equivalent Length

 

 

2" 90º sweep elbow

5 feet of 2" pipe

2" 45º sweep elbow

2-1/2 feet of 2" pipe

2" 90º standard elbow

10 feet of 2" pipe

2" 45º standard elbow

5 feet of 2" pipe

3" 90º sweep elbow

5 feet of 3" pipe

3" 45º sweep elbow

2-1/2 feet of 3" pipe

3" 90º standard elbow

10 feet of 3" pipe

3" 45º standard elbow

5 feet of 3" pipe

2" corrugated connector

10 feet of 2" pipe

3" corrugated connector

10 feet of 3" pipe

Example:

An 80,000 BTUH furnace requires 32 feet of pipe and four 90º elbows. Using 2" pipe and standard elbows, the total equivalent length will be:

32 feet of 2" pipe =

32 equivalent feet

4 - 90º standard 2" elbows = (4x10) =

40 equivalent feet

Total =

72 equivalent feet of 2" pipe

This exceeds the 65 foot maximum equivalent length of 2" pipe allowed for that model and is thus not acceptable.

By using sweep elbows, the total equivalent length will be:

32 feet of 2" pipe =

32 equivalent feet

4 - 90º standard 2" elbows = (4x5) =

20 equivalent feet

Total =

52 equivalent feet of 2" pipe

This is less than the 65 foot maximum equivalent length of 2" pipe allowed for that model and is thus acceptable.

Alternatively, using 3" pipe and standard elbows, the total equivalent length will be:

32 feet of 3" pipe =

32 equivalent feet

4 - 90º standard 2" elbows = (4x5) =

40 equivalent feet

Total =

72 equivalent feet of 3" pipe

This is less than the 90 foot maximum equivalent length of 3" pipe allowed for that model and is thus acceptable.

TABLE 10: Combustion Air Intake and Vent Connection Size at Furnace (All Models)

FURNACE VENT CONNECTION SIZES

Furnace Input

40 - 100 MBH

120 - 130 MBH

(17.5 - 29.3 kW)

(35.2 - 39.6 kW)

 

 

 

 

Intake Pipe Size

2” (5.1 cm)

3” (7.6 cm)

Vent Pipe Size

2” (5.1 cm)

2” (5.1 cm)

*. Vent pipe size must be increased to 3” diameter after connection to furnace on this model.

Accessory concentric vent / intake termination kits 1CT0302 and 1CT0303 are available and approved for use with these furnaces. Horizontal sidewall vent terminations kits 1HT0901 & 1HT0902 are also approved for use with these furnaces.

Furnace vent pipe connections are sized for 2” (5.1 cm). pipe. Any pipe size change must be made outside the furnace casing in a ver- tical pipe section to allow proper drainage of condensate. An offset using two 45º (degree) elbows will be required for plenum clear- ance when the vent is increased to 3” (7.6 cm).

COMBUSTION AIR AND VENT PIPING ASSEMBLY

The final assembly procedure for the combustion air and vent piping is as follows:

1.Cut piping to the proper length beginning at the furnace.

2.Deburr the piping inside and outside.

3.Chamfer (bevel) the outer edges of the piping.

4.Dry-fit the vent piping assembly from the furnace to the outside ter- mination checking for proper fit support and slope.

5.Dry-fit the combustion air piping assembly checking for proper fit, support and slope on the following systems:

a.Sealed combustion air systems from the furnace to the out- side termination.

b.Ventilated combustion air systems from the furnace to the attic or crawl space termination.

Solvent cements are flammable and must be used in well-ventilated areas only. Keep them away from heat, sparks and open flames. Do not breathe vapors and avoid contact with skin and eyes.

6.Disassemble the combustion air and vent piping, apply cement primer and the cement per the manufactures instructions. Primer and cement must conform to ASTM D2564 for PVC, or ASTM D2235 for ABS piping.

7.All joints must provide a permanent airtight and watertight seal.

8.Support the combustion air and vent piping such that it is angled a minimum of 1/4” per foot (21 mm/m) so that condensate will flow back towards the furnace. Piping should be supported with pipe hangers to prevent sagging.

9.Seal around the openings where the combustion air and / or vent piping pass through the roof or sidewalls.

COMBUSTION AIR / VENTING

The vent must be installed with the minimum required clearances, and must comply with local codes and requirements.

22

Johnson Controls Unitary Products

Page 22
Image 22
Johnson Controls TG9S*MP Combustion AIR and Vent Piping Assembly, Combustion AIR / Venting, Fitting Equivalent Length

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.