13
3
6
9
12
15
18
21
24
27
30
32
35
38
41
44
47
50
53
56
62
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
18.90
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
15
16
17
18
19
20
The BTUH input of the appliance
will be reduced by up to 5%.
The BTUH input of the appliance
will be reduced by up to 3%.
Number of
pieces**
1
3
2
4
1
3
2
4
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
7
8
ON=
OFF=
2
3
4
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 " 1 short length" condition. When adjusting the dip
switches for longer vent runs, the BTUH input of the appliance will be reduced by up to 5%.
Maximum Vent Length Adjustment Dipswitches
- 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 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 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 34 for the location of the dip switch bank.
<Maximum Vent Length Configurations>
