Install Instructions

11
The power must be unplugged when
adjusting the dip switches to switch
the airow amount.
The unit can be adjusted to accommodate longer vent runs; refer to the below table to nd 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 " 1 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 28 for the location of the dip switch bank.
<Maximum Vent Length Congurations>
* 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
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 10 2 3 4 5 6ft
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
32
2
2
2
2
1 Minimum length
2
3
4
Short length
Long length
Maximum length
**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 BTUH input of the appliance will be reduced by up to 3%.
****The BTUH input of the appliance will be reduced by up to 6%.