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Maximum Vent Length Adjustment Dipswitches
The unit can be adjusted to accommodate longer vent runs; refer to the below table to find the
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 switch-
es for longer vent runs, the BTUH input of the appliance will be reduced by up to 5%.
• Disconnect power to the water heater before changing the dip switches. Failure to perform
this step will result in a "73" code displayed on the remote controller and a cease in operation.
If this occurs, disconnect, then reconnect power to the water heater to reset the system.
Note : Please refer to page 30 for the location of the dip switch bank.
[Maximum Vent Length Example]
- Two 90° elbows, maximum length = 18 ft. (5.4m)
(with dip switches set at "short length" condition)
- Two 90° elbows, maximum length = 47 ft. (14.4m)
(with dip switches set at "long length" condition)
<Maximum Vent Length Configurations>
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
62
18.90
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
airflow amount.
0
1
0
3
1
3
1
1
1
1
3
3
2
1
3
1
3
3
3
3
1
1
1
1
4
3
3
5
3
1
3
1
6
1
1
3
3
7
1
3
1
3
8
1
3
1
3
9
3
2
4
1
1
4
10
3
2
2
4
11
2
4
12
2
4
2
4
2
4
2
4
13
2
2
4
14
4
2
4
2
4
15
4
2
2
4
16
2
4
4
2
17
2
4
2
4
18
2
4
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
2
1
1
1
1
3
3
2
2
1
3
2
4
1
4
2
3
2
2
4
2
2
4
2
4
2
4
2
2
2
4
2
4
2
2
4
2
4
2
4
2
4
2
4
2
2
2
4
2
4
2
4
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
4
2
4
2
4
4
2
2
4
4
4
2
4
2
4
4
2
4
4
2
4
4
4
7
8
13
- Quick Links:
- Vent Pipe Installation
Hide quick links:
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