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Maximum Vent Length Adjustment Dipswitches
maximum vent length based on the number of elbows. Adjust the dip switches according to the vent
condition noted in the tables below.
Note: By default, the unit has been set to the "short length" condition. When adjusting the dip
If this occurs, disconnect, then reconnect power to the water heater to reset the system.
(with dip switches set at "short length" condition)
(with dip switches set at "long length" condition)
Vent length
Number of
ft
m
pieces**
0
0.00
3
0.90
6
1.80
9
2.70
12
3.60
15
4.50
18
5.40
21
6.30
24
7.20
27
8.10
30
9.00
32
9.90
35
10.80
38
11.70
41
12.60
44
13.50
47
14.40
50
15.30
53
16.20
56
17.10
59
18.00
1
Short length using 3" (75mm) pipe
2
Long length using 3" (75mm) pipe
**Table assumes straight vent pieces are 3' (0.9m) each.
Shorter or longer vent pieces may also be used up to the maximum allowed
vent length.
The power must be unplugged when
adjusting the dip switches to switch the
air ow amount.
0
1
0
1
3
1
3
1
1
1
3
3
2
1
3
1
3
3
3
3
1
1
1
3
1
3
4
3
3
5
1
1
1
3
1
3
6
7
1
3
1
3
1
1
8
3
3
2
4
9
1
3
1
2
4
10
3
2
2
4
4
11
4
2
2
4
12
2
4
2
4
13
2
4
2
4
14
2
4
2
4
15
4
2
4
2
16
2
4
2
4
17
2
4
2
4
18
4
2
19
2
4
20
3
Short length using 4" (100mm) pipe
4
Long length using 4" (100mm) pipe
Elbows
2
3
4
1
3
1
3
1
1
1
1
3
3
1
3
1
3
1
3
3
1
1
2
1
3
1
3
2
3
2
4
2
1
2
1
3
2
4
2
4
2
2
4
4
2
2
2
4
2
2
4
2
4
4
2
2
4
2
2
4
2
4
2
2
4
2
4
2
2
4
4
2
2
4
2
4
2
4
2
4
* Do not change any other dipswitches.
* Vent length condition.
1
Short length using 3" (75mm) pipe
2
Long length using 3" (75mm) pipe
3
Short length using 4" (100mm) pipe
4
Long length using 4" (100mm) pipe
ON=
OFF=
5
6
3
2
4
2
4
4
4
3
2
2
3
2
4
2
4
4
2
4
2
4
4
2
4
2
4
4
2
4
2
4
2
4
2
4
4
4
2
2
4
4
4
2
4
2
4
4
2
4
4
2
4
4
4
7
8
.
13
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