13
0
3
6
9
12
15
18
21
24
27
30
32
35
38
41
44
47
50
53
56
59
0.00
0.90
1.80
2.70
3.60
4.50
5.40
6.30
7.20
8.10
9.00
9.90
10.80
11.70
12.60
13.50
14.40
15.30
16.20
17.10
18.00

m1023456ft

Vent length Elbows

0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Number of
pieces**
1
1
1
2
3
3
3
1
1
1
3
3
3
1
1
3
3
1
1
1
3
3
3
1
1
3
3
1
1
3
3
1
1
1
3
3
3
1
1
3
3
1
1
3
3
1
1
3
3
1
1
1
3
3
3
1
1
3
3
1
1
3
3
1
1
3
3
1
1
3
3
4
4
4
4
4
4
4
4
4
2
2
2
2
2
2
2
2
24
4
4
4
4
4
4
4
4
2
2
2
2
2
2
2
2
4
4
2
2
2 4
4
4
4
4
4
4
4
4
2
2
2
2
2
2
2
2
4
2
24
4
4
4
4
4
4
4
4
2
2
2
2
2
2
2
2
4
2
2 4
4
4
4
4
4
4
4
4
2
2
2
2
2
2
2
2
4
2
24
4
4
4
4
4
4
4
4
2
2
2
2
2
2
2
2
4
2
24
4
4
4
4
4
4
4
4
2
2
2
2
2
2
2
2
4
2
13
24
Short length using 4" (100mm) pipe
Short length using 3" (75mm) pipe
Long length using 3" (75mm) pipe
Long length using 4" (100mm) pipe
Short length using 4" (100mm) pipe
Short length using 3" (75mm) pipe
Long length using 3" (75mm) pipe
Long length using 4" (100mm) 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.
* Do not change any other dipswitches.
* Vent length condition.
1
78
ON= OFF=
2
3
4
The power must be unplugged when
adjusting the dip switches to switch the
airow amount.
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maximum vent length based on the number of elbows. Adjust the dip switches according to the vent
condition noted in the tables below.
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Maximum Vent Length Adjustment Dipswitches
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.
If this occurs, disconnect, then reconnect power to the water heater to reset the system.
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