Noritz NCC300DV - Maximum Vent Length Adjustment Dipswitches

13
Maximum Vent Length Adjustment Dipswitches
<Maximum Vent Length and Reduced Input Congurations>
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 short length using 4" (100mm) pipe" condition. When adjusting
the dip switches for longer vent runs, the BTUH input of the appliance will be reduced by up to 2%.
- Two 90° elbows, maximum length = 18 ft. (5.4m)
(with dip switches set at " 1 short length using 4" (100mm) pipe" condition)
- Two 90° elbows, maximum length = 51 ft. (15.3m)
(with dip switches set at " 2 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 11 for the location of the dip switch bank.
The power must be unplugged when adjusting
the dip switches to switch the airow amount.
3
6
9
12
15
18
21
24
27
30
33
36
39
42
45
48
51
54
57
60
63
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
m10234ft
Vent length* Elbows
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Number of
pieces**
3
6
9
12
15
18
21
24
27
30
33
36
39
42
45
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
m213
ft
Vent length*
5” Pipe
Elbows
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Number of
pieces**
1
3
2
4
Short length using 5" (127mm)pipe
Short length using 4" (100mm)pipe
Long length using 4" (100mm)pipe
Long length using 5" (127mm)pipe
Short length using 5" (127mm)

pipe
Short length using 4" (100mm)

pipe
Long length using 4" (100mm)

pipe
Long length using 5" (127mm)

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
78
ON=OFF=
2
3
4
PVC / CPVC pipe
PP pipe
Do not change any other dipswitches.
Vent Material
4
ON=OFF=
4” Pipe
* Not including the termination.
* Not including the termination.
4" schedule 80 pipe may also be used on this appliance,
however because the inside diameter is smaller than
schedule 40, the maximum vent length must be shortened.
Refer to page 17 for max. vent lengths
when using 4” PVC Concentric Termination.
1
2
4
3
The BTUH input of the
appliance will be reduced
by up to 2%.
The BTUH input of the
appliance will be reduced
by up to 2%.
Schedule 80
Schedule 40
The BTUH input of the
appliance will be reduced
by up to 2%.
The BTUH input of the
appliance will be reduced
by up to 2%.