11
The power must be unplugged when
adjusting the dip switches to switch
the airflow amount.
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 "minimum length" condition. When adjusting the dip
switches for longer vent runs, the BTUH input of the appliance will be reduced by up to 8%.
Maximum Vent Length Adjustment Dip Switches
- One 90 elbow, maximum length = 3 ft (0.9m)
(with dip switches set at "minimum length" condition)
- Two 90 elbows, maximum length = 30 ft (9.0m)
(with dip switches set at "maximum length" condition)
[Maximum Vent Length Example]
• 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 operation panel 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 21 for the location of the dip switch bank.
3
6
9
12
15
18
21
24
27
30
32
35
38
41
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
m
1
0
2
3
4
5
6
ft
Vent length
Elbows
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Number of
pieces**
1
1
1
1
2
2
2
3
3
3
3
3
3
3
3
3
3
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
3
3
3
3
2
2
**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.
2
2
2
1 Minimum length
2
3
4
Short length
Long length
Maximum length
<Maximum Vent Length Configurations>
* Do not change any other dipswitches.
* Vent length condition.
1 Minimum length
7
8
ON=
OFF=
2 Short length
3 Long length
4 Maximum length
