NR83 Installation Manual

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 "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 Connector
- Two 90 elbows, maximum length = 3 ft (0.9m)
(with dip switches set at "minimum length" condition)
- Two 90 elbows, maximum length = 29 ft (9m)
(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 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 23 for the location of the dip switch bank.
3
6
9
12
15
18
21
24
27
30
32
35
38
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
m 10 2 34
56
ft
Vent length Elbows
1
2
3
4
5
6
7
8
9
10
11
12
13
Number of
pieces**
11
1
12
2
23
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
44
4
4
3
3
3
32
2
1
2
3
4
Minimum length
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.
2
2
2
<Maximum Vent Length Congurations>
* Do not change any other dipswitches.
* Vent length condition.
1Minimum length
78
ON=OFF=
2Short length
3Long length
4Maximum length