Goodman Mfg CVC9/95, MVC95 installation instructions Upflow, Non-Directventsinglepipepiping

VENT/FLUE PIPE & COMBUSTION AIR PIPE

NON-DIRECTVENT(SINGLEPIPE)PIPING

Non-direct vent installations require only a vent/flue pipe. The vent pipe can be run horizontally with an exit through the side of the building or run vertically with an exit through the roof of the building. The vent can also be run through an existing unused chimney; however, it must extend a minimum of 12 inches above the top of the chimney. The space between the vent pipe and the chimney must be closed with a weather-tight, corrosion-resistant flashing. For details concerning connection of the vent/flue pipe to the fur- nace, refer to Vent/Flue Pipe and Combustion Air - Standard Fur- nace Connections or Alternate Furnace Connections for specific details. Refer to the following Non-Direct Vent (Single Pipe) Piping

-Vent/Flue Pipe Terminations for specific details on termination construction.

Although non-direct vent installations do not require a combustion air intake pipe, a minimum of one 90° elbow should be attached to the furnace’s combustion air intake if: an upright installation uses the standard intake location, or a horizontal installation uses the alternate air intake location. This elbow will guard against inadvert- ent blockage of the air intake.

VENT/FLUE PIPE LENGTHS AND DIAMETERS

Refer to the following table for applicable length, elbows, and pipe diameter for construction of the vent/flue pipe system of a non- direct vent installation. In addition to the vent/flue pipe, a single 90° elbow should be secured to the combustion air intake to prevent inadvertent blockage. The tee used in the vent/flue termination must be included when determining the number of elbows in the piping system.

UPFLOW

Non-Direct Vent (Single Pipe)

Maximum Allowable Length of Vent/Flue Pipe (ft) (1)(2)

Unit	Pipe	(4)				Number of Elbows (3)(5)
Input	(Inch)		1		2	3	4	5	6	7	8
45,000	2 or 2	1/2	71		68	65	62	59	56	53	50
70,000	2 or 2	1/2	49		46	43	40	37	34	31	28
	3		71		68	65	62	59	56	53	50
90,000	3		71		68	65	62	59	56	53	50
115,000	3		49		46	43	40	37	34	31	28
				COUNTERFLOW
		Non-Direct Vent (Single Pipe)
Maximum Allowable Length of Vent/Flue Pipe (ft) (1)(2)
Unit	Pipe	(4)				Number of Elbows (3)(5)
Input	(Inch)		1		2	3	4	5	6	7	8
70,000	2 or 2	1/2	61		58	55	52	49	46	43	40
	3		71		68	65	62	59	56	53	50
90,000	2 or 2	1/2	61		58	55	52	49	46	43	40
	3		71		68	65	62	59	56	53	50
115,000	3		71		68	65	62	59	56	53	50

1)One 90° elbow should be secured to the combustion air intake connection.

2)Minimum requirement for each vent pipe is five (5) feet in length and one elbow/tee.

3)Tee used in the vent/flue termination must be included when determining the number of elbows in the piping system.

4)2-1/2” or 3” diameter pipe can be used in place of 2” diameter pipe.

5)Increased Clearance Configurations using (2) 45 deg. Long Sweep el- bows should be considered equivalent to one 90 deg. elbow.

VENT/FLUE PIPE TERMINATIONS

The vent/flue pipe may terminate vertically, as through a roof, or horizontally, as through an outside wall.

Vertical vent/flue pipe terminations should be as shown in the fol- lowing figure. Refer to Vent/Flue Pipe and Combustion Air Pipe - Termination Locations for details concerning location restrictions. The penetration of the vent through the roof must be sealed tight with proper flashing such as is used with a plastic plumbing vent.

Horizontal vent/flue pipe terminations should be as shown in the following figure. Refer to Vent/Flue Pipe and Combustion Air Pipe

-Termination Locations for details concerning location restrictions. A 2 3/8” diameter wall penetration is required for 2” diameter pipe. A 3” diameter hole is required for a 2 1/2” pipe and a 3 1/2” diam- eter hole is required for 3” diameter pipe. To secure the pipe pass- ing through the wall and prohibit damage to piping connections, a coupling should be installed on either side of the wall and solvent cemented to a length of pipe connecting the two couplings. The length of pipe should be the wall thickness plus the depth of the socket fittings to be installed on the inside and outside of the wall. The wall penetration should be sealed with silicone caulking material.

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