Bryant 355CAV Carbon Monoxide Poisoning And, Attachment of Vent Pipe, General

355CAV

Crawlspace terminations require the open end of the combustion air intake pipe to point downward. Maintain 3 inches (76.2mm) of clearance below the floor joist insulation and 12 inches (304.8mm) above the grade. Screen the elbow with a wire mesh screen no smaller than 3/8-in. (9.5mm) square. (See Fig. 42 and 43.)

!WARNING

CARBON MONOXIDE POISONING HAZARD

Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monoxide poisoning or death.

The following steps shall be followed for each appliance connected to the venting system being placed into operation, while all other appliances connected to the venting system are not in operation:

1.Seal any unused openings in venting system.

2.Inspect the venting system for proper size and horizontal pitch, as required in the National Fuel Gas Code, ANSI Z223.1-2006/NFPA 54-2006 or the CSA B149.1, Natural Gas and Propane Installation Code and these instructions. Determine that there is no blockage or restriction, leakage, corrosion and other deficiencies, which could cause an unsafe condition.

3.As far as practical, close all building doors and windows and all doors between the space in which the appliance(s) connected to the venting system are located and other spaces of the building.

4.Close fireplace dampers.

5.Turn on clothes dryers and any appliance not connected to the venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they are operating at maximum speed. Do not operate a summer exhaust fan.

6.Follow the lighting instructions. Place the appliance being inspected into operation. Adjust the thermostat so appliance is operating continuously.

7.Test for spillage from draft hood equipped appliances at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match or candle.

8.If improper venting is observed during any of the above tests, the venting system must be corrected in accordance with the National Fuel Gas Code, ANSI Z223.1- 2006/NFPA 54-2006 and/or CSA B149.1, Natural Gas and Propane Installation Code.

9.After it has been determined that each appliance connected to the venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas-fired burning appliance to their previous conditions of use.

Combustion Air Termination-Direct Vent / 2-Pipe System

Combustion air pipe must terminate outside the structure with the vent pipe as shown in Fig. 36. Follow the clearance requirements shown in Fig. 39. Refer to Vent Termination section for complete details on termination options.

VENT PIPE

General

Furnace vent connection must be attached as shown in Fig. 39.

!WARNING

CARBON MONOXIDE POISONING AND

PROPERTY DAMAGE HAZARD

Failure to follow this warning could result in personal injury or death.

Vent pipes must be airtight.

NOTE: A 2-in. (50.8mm) diameter pipe must be used within the furnace casing. Make all pipe diameter transitions outside furnace casing per Fig. 38.

The minimum vent pipe length for these furnaces is 5 ft. (1.5M) Short pipe lengths (5-8 ft or 1.5M - 2.4M) may discharge condensate droplets. These condensate droplets may be undesirable. A 12-in. (304.8mm) minimum offset pipe section is recommended to reduce excessive condensate droplets from exiting vent pipe outlet. (See Fig. 44.)

Attachment of Vent Pipe

NOTE: Vent pipe system has the same diameter and same length as combustion air pipe as mentioned in section “Combustion Air Pipe and Vent Pipe Diameter.”

!CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in unit component damage.

Inducer housing outlet cap must be installed and fully seated against inducer housing. Clamp must be tightened to prevent any condensate leakage.

Vent pipe must be installed and fully seated against inducer housing. Clamp must be tightened to prevent any condensate leakage.

1.Determine location of vent pipe connection to inducer housing as shown in Fig. 39 for application.

2.Verify synthetic rubber inducer housing outlet cap and clamp are installed on appropriate unused inducer housing connection and that clamp is tight.

3.Install vent pipe grommet (factory-supplied in loose parts bag) into selected furnace casing vent pipe hole. (See Fig. 28.)

4.Be certain that mating surfaces of inducer housing connection synthetic rubber coupling, and 2-in. diameter vent pipe are clean and dry. Assemble the synthetic rubber vent coupling (with 2 loose clamps) onto inducer housing connection. Insert the 2-in. diameter vent pipe through the synthetic rubber coupling and fully into inducer housing connection until it touches a stop inside the inducer housing outlet. Tighten the screws on both clamps to 15-inlb. of torque.

5.Install casing hole filler cap (factory-supplied in loose parts bag) in unused vent pipe casing hole.

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