14
T
HE
RUBBER
ELBOW
IS
NOT
DESIGNED
TO
SUPPORT
A
LOAD
. W
HEN
THE
RUBBER
ELBOW
IS
MOUNTED
EXTERNALLY
TO
THE
FURNACE
CABINET
,
EXTREME
CARE
MUST
BE
TAKEN
TO
ADEQUATELY
SUPPORT
FIELD
-
SUPPLIED
VENT
/
FLUE
PIPING
,
AS
DAMAGE
CAN
RESULT
IN
LEAKS
CAUSING
BODILY
INJURY
OR
DEATH
DUE
TO
EXPOSURE
TO
FLUE
GASES
,
INCLUDING
CARBON
MONOXIDE
WARNING
A
LTERNATE
C
OMBUSTION
A
IR
P
ROVISION
(Upflow / Horizontal models only)
When using the alternate venting location, either in a hori-
zontal left side down installation or a vertical installation
using down – venting, an alternate combustion air opening
can be used. A locating dimple is located on the right side of
the furnace cabinet. The locating dimple is 1 7/8" mea-
sured from the front edge of the cabinet in line with the
knock out. To use the alternate combustion air location:
1. Remove screws and combustion air flange from
cabinet.
2. Insert cabinet plug in unused combustion air hole.
3. Drill a pilot hole at the cabinet dimple (size dictated
by knockout tool used).
4. Use a knockout tool to create a 3" diameter hole
5. Install combustion air flange and secure with screws
removed in step one.
B
E
SURE
NOT
TO
DAMAGE
INTERNAL
WIRING
OR
OTHER
COMPONENTS
WHEN
REINSTALLING
COUPLING
AND
SCREWS
.
CAUTION
N
ON
-D
IRECT
V
ENT
(S
INGLE
P
IPE
) P
IPING
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-resis-
tant flashing.
Although
non-direct
vent
installations do not require a combus-
tion 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 inadvertent blockage of the air intake.
V
ENT
/F
LUE
P
IPE
L
ENGTHS
AND
D
IAMETERS
NOTE:
If either a 90 degree or 45 degree elbow is used for
termination, it must be pointed downward.
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.
1
2
3
4
5
6
7
8
40,000
2
or 2 1/2
120
115
110
105
100
95
90
85
60,000
2
or 2 1/2
95
90
85
80
75
70
65
60
80,000 "B"
2 or 2 1/2
75
70
65
60
55
50
45
40
80,000 "B"
3
200
193
186
179
172
165
158
151
80,000 "C"
2 or 2 1/2
25
20
15
10
5
N/A
N/A
N/A
80,000 "C"
3
200
193
186
179
172
165
158
151
100,000
2 or 2 1/2
25
20
15
10
5
N/A
N/A
N/A
100,000
3
200
193
186
179
172
165
158
151
120,000
2 or 2 1/2
45
40
35
30
25
20
15
10
120,000
3
95
90
85
80
75
70
65
60
*MVC96/*CVC96 Direct Vent (2 - Pipe) and Non-Direct Vent (1- Pipe)
(6)
Maximum Allowable Length of Vent/Flue Pipe
& Combustion Air Pipe (ft)
(1) (2)
Unit Input
(Btu)
Pipe Size
(4)
(in.)
Number of Elbows
(3) (5)
1)
Maximum allowable limits listed on individual lengths for inlet and flue and
NOT a combination.
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 elbows
should be considered equivalent to one 90 deg. elbow.
6)
One 90° elbow should be secured to the combustion air intake connection.
V
ENT
/F
LUE
P
IPE
T
ERMINATIONS
NOTE:
If either a 90 degree or 45 degree elbow is used for
termination, it must be pointed downward.
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
following figure. Refer to
Vent/Flue Pipe and Combustion Air
Pipe - Termination Locations
for details concerning location re-
strictions. 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.
To secure the pipe passing 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.
NOTE: Terminate both pipes in the same pressure zone
(same side of roof, no major obstacles between pipes,
etc.).
Содержание *CVC96
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