13
5IFVOJUDBOCFBEKVTUFEUPBDDPNNPEBUFMPOHFSWFOUSVOTSFGFSUPUIFCFMPXUBCMFUPàOEUIF
maximum vent length based on the number of elbows. Adjust the dip switches according to the vent
condition noted in the tables below.
Note:
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UIFEJQTXJUDIFTGPSMPOHFSWFOUSVOTUIF#56)JOQVUPGUIFBQQMJBODFXJMMCFSFEVDFECZVQUP
Maximum Vent Length Adjustment Dipswitches
5XP
elbows, maximum length = 3 ft. (0.9m)
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5XPFMCPXTNBYJNVNMFOHUIGU N
XJUIEJQTXJUDIFTTFUBUMPOHMFOHUIVTJOH NNQJQFDPOEJUJPO
<.BYJNVN7FOU-FOHUI&YBNQMF>
r%JTDPOOFDUQPXFSUPUIFXBUFSIFBUFSCFGPSFDIBOHJOHUIFEJQTXJUDIFT'BJMVSFUPQFSGPSN
UIJTTUFQXJMMSFTVMUJOBDPEFEJTQMBZFEPOUIFSFNPUFDPOUSPMMFSBOEBDFBTFJOPQFSBUJPO
.
If this occurs, disconnect, then reconnect power to the water heater to reset the system.
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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**
3
3
0%
-3%
-3%
-5%
3
3
3
3
3
3
3
3
3
4
4
4
4
4
4
4
4
4
4
4
3
3
0%
-3%
-3%
-5%
3
3
3
3
3
3
3
4
4
4
4
4
4
4
4
4
4
4
3
3
0%
-3%
-3%
-5%
3
3
3
3
3
4
4
4
4
4
4
4
4
4
4
4
3
3
0%
-3%
-3%
-5%
3
3
3
4
4
4
4
4
4
4
4
4
4
4
3
3
0%
-3%
-3%
-5%
3
4
4
4
4
4
4
4
4
4
4
4
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
1
0%
0%
-5%
-5%
1
1
1
1
2
2
2
2
2
2
2
2
2
2
1
1
0%
0%
-5%
-5%
1
1
2
2
2
2
2
2
2
2
2
1
1
0%
0%
-5%
-5%
2
2
2
2
2
2
2
2
0%
-5%
2
2
2
2
2
2
2
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 TWHHORCONC.
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The power must be unplugged
when adjusting the dip switches
to switch the airflow amount.
