Bryant 355M-40-4 COMBUSTION-AIR Intake Housing Plug Fitting, Termination KIT Installation

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. 31, 32, 33, 34, or 35 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. 30.)

COMBUSTION – AIR

INTAKE HOUSING

3/8" ID TUBE	BURNER
	BOX

WARNING: Vent pipe must be installed and fully seated against inducer housing. Clamp must be tightened to prevent any condensate leakage. Failure to follow this warning could result in electrical shock, fire, personal injury, or death.

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

3.Working from furnace to outside, cut pipe to required length(s).

4.Deburr inside and outside of pipe.

5.Chamfer outside edge of pipe for better distribution of primer and cement.

6.Clean and dry all surfaces to be joined.

7.Check dry fit of pipe and mark insertion depth on pipe.

NOTE: It is recommended that all pipes be cut, prepared, and preassembled before permanently cementing any joint.

8.	After pipes have been cut and preassembled, apply gener-
	ous layer of cement primer to pipe fitting socket and end of
	pipe to insertion mark. Quickly apply approved cement to
	end of pipe and fitting socket (over primer). Apply cement
	in a light, uniform coat on inside of socket to prevent
	buildup of excess cement. Apply second coat.
9.	While cement is still wet, twist pipe into socket with 1/4
	turn. Be sure pipe is fully inserted into fitting socket.
10.	Wipe excess cement from joint. A continuous bead of

3/16"

DRILL

TRAP

TO OPEN

DRAIN

4″￿

MIN

COMBUSTION – AIR PIPE

	cement will be visible around perimeter of a properly made
	joint.
11.	Handle pipe joints carefully until cement sets.
12.	Support combustion-air and vent piping a minimum of
	every 5 ft (3 ft for SDR-21 or -26 PVC) using perforated
	metal hanging strap.
13.	Slope combustion-air and vent pipes toward furnace a
	minimum of 1/4 in. per linear ft with no sags between
	hangers.
14.	Use appropriate methods to seal openings where vent and

Fig. 30ÐIntake Housing Plug Fitting Drain

A93035

combustion-air pipes pass through roof or sidewall.

III. CONCENTRIC VENT AND COMBUSTION-AIR

TERMINATION KIT INSTALLATION

2.Attach vent pipe as follows:

a.Determine location of vent pipe connection to inducer housing as shown in Fig. 28 for application.

b.Reposition neoprene inducer housing outlet cap and clamp to appropriate unused inducer housing connec- tion. Tighten clamp.

WARNING: Inducer housing outlet cap must be in- stalled and fully seated against inducer housing. Clamp must be tightened to prevent any condensate leakage. Failure to follow this warning could result in electrical shock, fire, personal injury, or death.

c.Install pipe support (factory-supplied in loose parts bag) into selected furnace casing vent pipe hole. Pipe support should be positioned to bottom of casing hole.

d.Insert 2-in. diameter pipe into inducer housing through neoprene coupling and clamp in inducer housing. Tighten clamp.

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NOTE: If these instructions differ from those packaged with termination kit, follow kit instructions.

Combustion-air and vent pipes must terminate outside structure. A factory accessory termination kit must be installed in 1 of the installations shown in Fig. 31, 32, 33, 34, or 35. Four termination kits are available.

1.The 2-in. termination bracket kit is for 1-in., 1-1/2 in., and 2-in. diameter 2-pipe termination systems.

2.The 3-in. termination bracket kit is for 2-1/2 in. and 3-in. diameter 2-pipe termination systems.

3.The 2-in. concentric vent/air termination kit is for 1-in., 1-1/2 in., 2-in., and 2-1/2 in. diameter pipe systems when single penetration of wall or roof is desired.

4.The 3-in. concentric vent/air termination kit is for 2-1/2 in. and 3-in. diameter pipe systems when single penetration of wall or roof is desired.

NOTE: Shaded parts in Fig. 31, 32, 33, 34, and 35 are considered to be terminations. These components should NOT be counted when determining pipe diameter. Roof termination is preferred since it is less susceptible to damage, has reduced chances to intake