Bryant 4-Way Multipoise Fixed-Capacity Direct-Vent Condensing Gas 340MAV User Manual

Page 23

f. Drill a 1/8-in. hole in 2-in. combustion-air pipe using

hole in intake housing as a guide.

g. Install a field-supplied No. 6 or No. 8 sheet metal screw

into combustion-air pipe.

NOTE:

DO NOT OVERTIGHTEN SCREW. Breakage to 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

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 to 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 is similar
to that shown in Fig. 30, 31, 32, 33, or 34 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. 29.)

2. Attach vent pipe as follows:

a. Determine location of vent pipe connection to inducer

housing as shown in Fig. 27 for application.

Fig. 28—Short Vent (5 to 8 Ft) System

A96230

HORIZONTAL TO ROOF

HORIZONTAL TO SIDEWALL

VERTICAL TO SIDEWALL

VERTICAL TO ROOF

VENT PIPE

COMBUSTION-AIR PIPE

VENT PIPE

COMBUSTION-AIR PIPE

VENT PIPE

COMBUSTION-AIR PIPE

VENT PIPE

″

MIN

″

MIN

″

MIN

″

MIN

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.

Fig. 29—Intake Housing Plug Fitting Drain

A93035

COMBUSTION –
AIR PIPE

BURNER
BOX

COMBUSTION – AIR
INTAKE HOUSING

3/8" ID TUBE

TRAP

TO OPEN

DRAIN

3/16"

DRILL

″

MIN

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