Rinnai RUR98e (REU-KBP3237WD-US) Installation Manual Page 11

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KBP 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 SW1 in the 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.
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 posion. This ensures the
water heater will run properly. Blocked ue
diagnosc codes and shutdowns may result if SW1 in
DIPSW 1 is not in the correct posion.


(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


(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 (8.8)
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 SW1 in DIPSW 1 to
OFF.
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