268890-UIM-B-0607

 

 

 

 

 

COMBUSTION AIR AND VENT PIPING ASSEMBLY

 

A

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

A

 

 

as follows:

 

 

 

 

1.

Cut piping to the proper length beginning at the furnace.

 

 

2.

Deburr the piping inside and outside.

 

A

3.

Chamfer (bevel) the outer edges of the piping.

A

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:

STANDARD ELBOW

LONG (SWEEP) ELBOW

 

A. Sealed combustion air systems from the furnace to the out-

FIGURE 16: Dimensions

 

 

side termination.

 

 

B. Ventilated combustion air systems from the furnace to the

TABLE 10: Elbow Dimensions

 

 

 

 

attic or crawl space termination.

Elbow

"A" Dimension

 

 

 

 

 

 

 

 

 

 

 

 

2" Standard

2-5/16"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3" Standard

3-1/16"

 

Solvent cements are flammable and must be used in well-ventilated

2" Sweep

3-1/4"

 

areas only. Keep them away from heat, sparks and open flames.

 

 

 

Do not breathe vapors and avoid contact with skin and eyes.

3" Sweep

4-1/16"

 

 

6.

Disassemble the combustion air and vent piping, apply cement

Dimensions are those required in Standard ASTM D-3311.

NOTE: Sidewall vent terminal may be used for sidewall vent termina-

 

primer and the cement per the manufactures instructions. Primer

 

and cement must conform to ASTM D2564 for PVC, or ASTM

tions. Refer to part list in the back of the USERS INFORMATION AND

 

 

D2235 for ABS piping.

SERVICE AND MAINTENANCE MANUAL for the terminal part number.

 

7.

All joints must provide a permanent airtight and watertight seal.

 

 

TABLE 11: Combustion Air Intake and Vent Connection Size at Furnace (All Models)

FURNACE VENT CONNECTION SIZES

Furnace Input

40 - 100 MBH

120 MBH

(17.5 - 29.3 kW)

(35.2 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.

IMPORTANT: 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.

IMPORTANT: 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 vertical pipe section to allow proper drainage of condensate. An offset using two 45º (degree) elbows will be required for plenum clearance when the vent is increased to 3” (7.6 cm).

8.Support the combustion air and vent piping such that it is angled a minimum of 1/4” per foot (0.635 cm/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 / VENT CLEARANCES

IMPORTANT: The vent must be installed with the minimum clearances as shown in Figure 17, and must comply with local codes and require- ments.

16

Unitary Products Group

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York GY9S*DH, GM9S*DH, GF9S*DH Combustion AIR and Vent Piping Assembly, Combustion AIR / Vent Clearances, Elbow Dimension
Page 15 Page 17

GF9S*DH, GY9S*DH, GM9S*DH specifications

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