KB Series Manual 11
Maximum vent length
1.Determine the number of 90 degree elbows in the
vent system. (Two 45 degree elbows count as
one 90 degree elbow.)
2.Refer to the table to nd the maximum vent length
based on the number of elbows.
3.Adjust switch No. 1 in the SW1 DIP switch (tan
switches) if required by the applicable note.
If the length is greater than 21 (6.4 m) then
move switch No. 1 (SW1) to OFF.
If the length is greater than 15 (4.6 m) then
move switch No. 1 (SW1) to OFF.
If the length is greater than 9 (2.7 m) then move
switch No. 1 (SW1) to OFF.
Move switch No. 1 (SW1) to OFF.
If you have a longer vent length (see above), switch
No. 1 is required to be in the OFF posion. This
ensures the water heater will run properly. Blocked
ue diagnosc codes and shutdowns may result if
switch No. 1 is not in the correct posion.
(Intake is the short UV protected 90° elbow)
If length is greater
0 41 (12.50 m)
18 (5.49 m) move
switch #1 to OFF
1 26 (7.93 m)
3 (0.91 m) move
switch #1 to OFF
2 11 (3.35 m)
move switch #1 to
OFF for any length
If length is greater
0 41 (12.50 m)
21 (6.40 m) move
switch #1 to OFF
1 35 (10.67 m)
15 (4.57 m) move
switch #1 to OFF
2 29 (8.84 m)
9 (2.74 m) move
switch #1 to OFF
3 23 (7.01m)
3 (0.91 m) move
switch #1 to OFF
4 17 (5.18 m)
move switch #1 to
OFF for any length
5 11 (3.35 m)
6 5 (1.52 m)
(Intake is the long UV protected 90° elbow)
InnoFlue Vent System (single wall SW, 3 inch diameter)
(90° elbow is equivalent to 6 feet; 45° elbow is equivalent to 3 feet.)
0 41 (12.5)
1
1 35 (10.7)
2
2 29 (8.8)
3
3 23 (7.0)
4
4 17 (5.2)
4
5 11 (3.4)
4
6 5 (1.5)
4
(90° elbow is equivalent to 6 feet; 45° elbow is equivalent to 3 feet.)
0 65 (19.8)
1
1 59 (18.0)
2
2 53 (16.2)
3
3 47 (14.3)
4
4 41 (12.5)
4
5 35 (10.7)
4
6 29 (08.8)
4
Example: If you have one elbow then your
maximum vent length is 35 feet (10.7 m).
If your actual length is greater than 15
(4.6 m) then move switch no. 1 (SW1) to
OFF.
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