Bryant 355CAV installation instructions Vent Termination, Extended Exposed Sidewall Pipes

NOTE: Starting at furnace, slope vent pipe a minimum of 1/4-in. (6 mm) per linear ft. back toward furnace with no sags between hangers.

VENT TERMINATION

General

Combustion-air (direct Vent / 2-pipe system only) and vent pipe must terminate outside structure, either through sidewall or roof. For vent termination clearance, refer to Fig. 34 for Direct Vent / 2- Pipe system and Fig. 35 for Ventilated Combustion Air option.

Roof termination is preferred since it is less susceptible to damage or contamination, and it has less visible vent vapors. Sidewall termination require sealing or shielding of building surfaces with a corrosive resistance material due to corrosive combustion products of vent system.

NOTE: (Direct Vent / 2-Pipe system ONLY) A factory accessory termination kit MUST be used. See section “Vent Termination Kit (Direct Vent / 2-Pipe System Only)” in this instruction.

When determining appropriate location for termination, consider the following guidelines:

1.Comply with all clearance requirements stated in Fig. 34 or Fig. 35 per application.

2.Termination or termination kit should be positioned where vent vapors will not damage plants/shrubs or air condi- tioning equipment.

3.Termination or termination kit should be positioned so that it will not be affected by wind eddy, such as inside build- ing corners, nor by recirculation of flue gases, airborne leaves, or light snow.

4.Termination or termination kit should be positioned where it will not be damaged by or subjected to foreign objects such as stones, balls, etc.

5.Termination or termination kit should be positioned where vent vapors are not objectionable.

Extended Exposed Sidewall Pipes

Sidewall combustion air pipe termination (direct Vent / 2-pipe system only) and vent pipe termination may be extended beyond area shown in Fig. 36 or in Fig. 37 per application in outside ambient by insulating pipe as indicated in Table 6.

1.Determine combustion air pipe diameter (direct Vent / 2-pipe system only) and vent pipe diameter, as stated above, using total pipe length and number of elbows.

2.Using winter design temperature (used in load calcula- tions), find appropriate temperature for your application and furnace model.

3.Determine required insulation thickness for exposed pipe length(s).

NOTE: Pipe length (ft / M) specified for maximum pipe lengths located in unconditioned spaces cannot exceed total allowable pipe length as specified in Table 6.

Vent Termination Kit (Direct Vent / 2-Pipe System Only)

NOTE: Always refer to the instructions in termination kit for the latest version.

Combustion air and vent pipes MUST terminate outside structure. A factory accessory termination kit must be installed as shown in Table 8. There are four options of vent/combustion air termination kits available as shown in Table 8.

NOTE: Combustion air pipe must have the same diameter as vent pipe.

Concentric Vent / Combustion Air Termination Kit (Direct Vent / 2-Pipe System Only

Determine an appropriate location for termination kit using the guidelines provided in section “Vent Termination: General” in this instruction.

1.Cut one 4-in. diameter hole for 2-in. kit, or one 5-in. dia- meter hole for 3-in. kit.

2.Loosely assemble concentric vent/combustion air termina- tion components together using instructions in kit.

3.Slide assembled kit with rain shield REMOVED through hole.

NOTE: Do not allow insulation or other materials to accumulate inside of pipe assembly when installing it through hole.

Roof terminations-Locate assembly through roof to appropriate height as shown in Fig. 36 or Fig. 37.

Sidewall terminations-Locate assembly through sidewall with rain shield positioned no more than 1-in (25 mm). from wall as shown in Fig. 36 and Fig. 37.

4.Disassemble loose pipe fittings. Clean and cement using same procedures as used for system piping.

5.Check required dimensions as shown.

Two-Pipe Termination Kit (Direct Vent / 2-Pipe System

Only)

Determine an appropriate location for termination kit using the guidelines provided in section “Vent Termination: General” in this instruction.

1.Cut 2 holes, 1 for each pipe, of appropriate size for pipe size being used.

2.Loosely install elbow in bracket and place assembly on combustion-air pipe.

Roof terminations-Loosely install pipe coupling on properly cut vent pipe. Coupling must be positioned so bracket will mount as shown in Fig. 38.

For applications using combustion-air pipe option, indic- ated by dashed lines in Fig. 36, install 90_ street elbow into 90_ elbow, making a U-fitting. A 180_ U-fitting may be used.

Sidewall terminations-Install bracket as shown in Fig. 36.

For applications using vent pipe option indicated by dashed lines in Fig. 36, rotate vent elbow 90_ from position shown in Fig. 36.

3.Disassemble loose pipe fittings. Clean and cement using same procedures as used for system piping.

4.Check required dimensions as shown in Fig. 36.

(Direct Vent / 2-Pipe System ONLY)-When 2 or more 355CAV furnaces are vented near each other, 2 vent terminations may be installed as shown in Fig. 36, but next vent termination must be at least 36 in. (914 mm) away from first 2 terminations. It is important that vent terminations be made as shown in Fig. 36 to avoid recirculation of flue gases.

355CAV

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