Bryant 340MAV instruction manual ShortVent 5 to 8 Ft System

12″ MIN

12″ MIN

VENT PIPE

VENT PIPECOMBUSTION-AIR PIPE

COMBUSTION-AIR PIPE

HORIZONTAL TO ROOF	HORIZONTAL TO SIDEWALL
	COMBUSTION-AIR PIPE
	VENT PIPE
COMBUSTION-AIR PIPE
	12″ MIN
12″ MIN	VENT PIPE
VERTICAL TO ROOF	VERTICAL TO SIDEWALL

NOTE: A 12 In. minimum offset pipe section is recommended with short (5 to 8 ft) vent systems. This recommendation is to reduce excessive condensate droplets from exiting the vent pipe.

A96230

Fig. 34—Short Vent (5 to 8 Ft) System

d.Install pipe support (factory-supplied in loose parts bag) into selected furnace casing combustion-air pipe hole. Pipe support should be positioned at bottom of casing hole.

e.Insert 2-in. diameter pipe into intake housing.

NOTE: A 2-in. diameter pipe must be used within the furnace casing. Make all pipe diameter transitions outside furnace casing.

f. Install casing hole filler cap (factory-supplied in loose parts bag) in unused combustion-air pipe casing hole.

g. Drill a 1/8-in. hole in 2-in. combustion-air pipe using hole in intake housing as a guide.

h.Install a field-supplied No. 6 or No. 8 sheet metal screw into combustion-air pipe.

NOTE: DO NOT OVERTIGHTEN SCREW. Breakage of intake housing or fitting may cause air leakage to occur.

NOTE: Do not attach combustion-air intake pipe permanently to combustion-air intake housing since it may be necessary to remove pipe for service of ignitor or flame sensor.

COMBUSTION-AIR INTAKE HOUSING PLUG

FITTING

—26—

The combustion-air intake plug fitting must be installed in unused combustion-air intake housing. This fitting must be attached by using RTV sealant, or by drilling a 1/8-in. hole in fitting, using hole in intake housing as a guide. Install a field-supplied No. 6 or No. 8 sheet metal screw.

NOTE: DO NOT OVERTIGHTEN SCREW. Breakage of intake housing or fitting may cause air leakage to occur.

A plugged drain connection has been provided on this fitting for use when moisture is found in combustion-air intake pipe and combustion box.

NOTE: Moisture in combustion-air intake may be result of improper termination. Ensure combustion-air intake pipe termina- tion is similar to that shown in Fig. 36, 37, 38, 39, and 40 so it will not be susceptible to areas where light snow or other sources of moisture could be pulled in.

If use of this drain connection is desired, drill out fitting’s tap plug with a 3/16-in. drill and connect a field-supplied 3/8-in. tube. This tube should be routed to open condensate drain for furnace and A/C (if used), and should be trapped. (See Fig. 35.)

2.Attach vent pipe as follows:

a.Determine location of vent pipe connection to inducer housing as shown in Fig. 33 for application.