13
Maximum Vent Length Adjustment Dipswitches
0
3
6
9
12
15
18
21
24
27
30
33
36
39
42
45
48
51
54
57
60
63
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
18.90
m
1
0
2
3
4
ft
Vent length*
Elbows
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Number of
pieces**
0
3
6
9
12
15
16
18
21
22
24
27
28
30
33
34
0.00
0.90
1.80
2.70
3.60
4.50
4.80
5.40
6.30
6.60
7.20
8.10
8.40
9.00
9.90
10.20
m
1
0
2
3
ft
Vent length*
3” Pipe
Elbows
0
1
2
3
4
5
6
6
7
8
8
9
10
10
11
12
Number of
pieces**
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
4” Pipe
* Not including the termination.
* Not including the termination.
Refer to page 16 for max. vent lengths
when using termination VK3-H-PVC.
1
3
2
4
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%.
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 5%.
<Maximum Vent Length and Reduced Input Configurations>
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 using 3" (75mm) pipe" condition. When adjusting
the dip switches for longer vent runs, the BTUH input of the appliance will be reduced by up to 5%.
- Two 90° elbows, maximum length = 3 ft. (0.9m)
(with dip switches set at " 1 short length using 3" (75mm) pipe" condition)
- Two 90° elbows, maximum length = 51 ft. (15.3m)
(with dip switches set at " 4 long length using 4" (100mm) pipe" 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 36 for the location of the dip switch bank.
The power must be unplugged
when adjusting the dip switches
to switch the airflow amount.
