Direct Vent (Dual Pipe ) Piping - Goodman GMS9 Installation Instructions Manual

Vertical Termination (Single Pipe)
12" MIN.
TO ROOF OR
HIGHEST
ANTICIPATED
SNOW LEVEL
Alternate Vertical Termination (Single Pipe)
WALL
INSIDE
ELBOW OR
COUPLING
Horizontal Termination (Single Pipe)
12" MIN.
Horizontal Termination (Single Pipe)
Above Highest Anticipated Snow Level
D V (D P
IRECT ENT UAL IPE
The inlet air screens provided in the installation instruction packet
are available for the installer to use in the inlet of the combustion air
pipe to prevent animals from building nests in the combustion air
pipe. Installation of screens, while strongly recommended, is not
required and will not affect performance of the unit.
Direct vent installations require both a combustion air intake and a
vent/flue pipe. The pipes may be run horizontally and exit through
the side of the building or run vertically and exit through the roof of
the building. The pipes may be run through an existing unused
chimney; however, they must extend a minimum of 12 inches above
the top of the chimney. The space between the pipes and the chim-
ney must be closed with a weather tight, corrosion resistant flash-
ing. Both the combustion air intake and a vent/flue pipe termina-
tions must be in the same atmospheric pressure zone. Refer to
Section IX, Vent/Flue and Combustion Air Pipe - Termination Loca-
TEE
12 " Min To
Roof Or
Highest Anticipated
Snow Level
90º
MEDIUM RADIUS
ELBOWS
OUTSIDE
TEE
or
90°ELBOW
TURNED
DOWN
COUPLING
MIN.
12"
FROM
12"
WALL
TO GROUND OR
HIGHEST ANTICIPATED
SNOW LEVEL
VENT/FLUE TEE
or
90° ELBOW TURNED
DOWN
) P
IPING
tions or Concentric Vent Termination for specific details on termina-
tion construction. For details concerning connection of pipes to the
furnace, refer to the Section IX, Vent/Flue Pipe and Combustion
Pipe - Standard Furnace Connections or Alternate Furnace Con-
nections.
V /F C
ENT LUE AND OMBUSTION
Refer to the following table for applicable length, elbows, and pipe
diameter for construction of the vent/flue and combustion air intake
pipe systems of a direct vent (dual pipe) installation. The number of
elbows tabulated represents the number of elbows and/or tees in
each (Vent/Flue & Combustion Air Intake) pipe. Elbows and/or tees
used in the terminations must be included when determining the
number of elbows in the piping systems.
If the combustion air intake pipe is to be installed above a finished
ceiling or other area where dripping of condensate will be objection-
able, insulation of the combustion air pipe may be required. Use
1/2" thick closed cell foam insulation such as Armaflex or Insultube
where required.
Dire ct Ve nt (Dual Pipe)
Maximum Allowable Length of Vent/Flue & Combustion
Vent/Flue/Air
Unit Input
Intake
(Btu)
Termination
Standard
45,000
Alternate
Standard
70,000
Alternate
Standard
90,000
Alternate
Standard
115,000
Alternate
Standard
115,000
Alternate
1) One 90° elbow should be secured to the combustion air intake connec-
tion.
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 determin-
ing the number of elbows in the piping system.
4) 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.
V /F C
ENT LUE AND OMBUSTION
The vent/flue and combustion air pipes may terminate vertically, as
through a roof, or horizontally, as through an outside wall.
Vertical pipe terminations should be as shown in the following fig-
ure. Refer to Section IX, Vent/Flue Pipe and Combustion Pipe -
Termination Locations for details concerning location restrictions.
The penetrations through the roof must be sealed tight with proper
flashing such as is used with a plastic plumbing vent.
COMBUSTION
AIR INTAKE
12" MIN.
12" MIN.
TO ROOF OR
SCREEN
HIGHEST
ANTICIPATED
SNOW LEVEL
Vertical Terminations (Dual Pipe)
Horizontal terminations should be as shown in the following figure.
Refer to Section IX, Vent/Flue Pipe and Combustion Pipe - Termi-
17
A P L D
IR IPE ENGTHS AND
Air Intak e Pipe (ft)
Pipe
Num ber of Elbows
(4)
Size
(in.) 2 3 4 5
2 68 65 62 59
2 55 52 49 46
2 68 65 62 59
2 55 52 49 46
2 55 52 49 46
2 42 39 36 33
2 26 23 20 Not Recom mended
2 7 10 Not Recomm ended
3 88 87 80 76
3 74 70 66 62
A P T
IR IPE ERMINATIONS
TEE
VENT/FLUE
90º
MEDIUM RADIUS
ELBOWS
24" MAX.
3" MIN.
IAMETERS
(1)(2)(3)(5)
6 7 8
56 53 50
43 40 37
56 53 50
43 40 37
43 40 37
30 27 24
72 68 64
58 54 50