16 KCM Series Manual
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 SW1 in DIPSW 1 (tan switches) if required
by the applicable note.
If the length is greater than 21 (6.4 m) then
move SW1 to OFF.
If the length is greater than 15 (4.6 m) then
move SW1 to OFF.
If the length is greater than 9 (2.7 m) then move
SW1 to OFF.
Move SW1 to OFF.
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 SW1 in DIPSW 1 to OFF.
If you have a longer vent length (see number 3
regarding max. vent length), SW1 in DIPSW 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 SW1 in
DIPSW 1 is not in the correct posion.
(Intake is the short UV protected 90° elbow)
If length is greater
than:
0 41 (12.50 m)
18 (5.49 m) move
SW1 to OFF
1 26 (7.93 m)
3 (0.91 m) move SW1
to OFF
2 11 (3.35 m)
move SW1 to OFF for
any length
If length is greater
than:
0 41 (12.50 m) 21 (6.40 m) move
1 35 (10.67 m) 15 (4.57 m) move
2 29 (8.84 m) 9 (2.74 m) move
3 23 (7.01m) 3 (0.91 m) move
4 17 (5.18 m)
move SW1 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
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