Bryant 345MAV instruction manual Vent Extension Pipe, 040 060 080 100 120

TABLE 5ÐMAXIMUM ALLOWABLE EXPOSED VENT PIPE LENGTH (FT) WITH INSULATION IN

WINTER DESIGN TEMPERATURE AMBIENT*

UNIT	WINTER DESIGN	MAX PIPE	WITHOUT	WITH 3/8-IN. OR
	TEMPERATURE	DIAMETER
SIZE			INSULATION	THICKER INSULATION²
	(°F)	(IN.)
	20	1.5	51	70
	0	1.5	28	70
040	-20	1.5	16	70
	20	2	45	70
	0	2	22	70
	-20	2	10	58
	20	2	65	70
060
	0	2	35	70
	-20	2	20	70
	20	2	55	55
	0	2	48	55
080	-20	2	30	55
	20	2.5	70	70
	0	2.5	47	70
	-20	2.5	28	70
	20	2.5	40	40
	0	2.5	40	40
100	-20	2.5	38	40
	20	3	70	70
	0	3	50	70
	-20	3	28	70
	20	3	70	70
120	0	3	61	70
	-20	3	37	70

* Pipe length (ft) specified for maximum pipe lengths located in unconditioned spaces. Pipes located in unconditioned space cannot exceed total allowable pipe length as specified in Table 4.

² Insulation thickness based on R value of 3.5 (ft 2·°F·hr.)/(Btu·in.)

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.

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

→4. Be certain that mating surfaces of inducer housing connec- tion, elastomeric coupling, and 2-in. diameter vent pipe are clean and dry. Assemble the elastomeric (rubber) vent coupling (with 2 loose clamps) onto inducer housing connection. Insert the 2-in. diameter vent pipe through the elastomeric (rubber) coupling and fully into inducer hous- ing connection until it bottoms on the internal stop. Tighten both clamps to secure the pipe to inducer housing. Tighten the clamp screws to 15 in.-lb. of torque.

→WARNING: Vent pipe must be installed and fully seated against inducer housing internal stop. 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.

VENT EXTENSION PIPE

Some furnaces are supplied with a PVC vent extension pipe (2-in. diameter by 12-in. long). This pipe has a built-in

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channel to assist vent condensate disposal. When this vent extension pipe is supplied, it must be used to connect the field vent pipe to furnace inducer housing on ALL upflow and downflow applications.

NOTE: See label on vent extension pipe for proper installation. This pipe may be shortened if an elbow is used to connect vent extension tube to field-installed vent pipe.

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

6.Deburr inside and outside of pipe.

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

8.Clean and dry all surfaces to be joined.

9.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.

10.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.

11.While cement is still wet, twist pipe into socket with 1/4 turn. Be sure pipe is fully inserted into fitting socket.

12.Wipe excess cement from joint. A continuous bead of cement will be visible around perimeter of a properly made joint.

13.Handle pipe joints carefully until cement sets.

14.Support vent piping a minimum of every 5 ft (3 ft for SDR-21 or -26 PVC) using perforated metal hanging strap.