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To determine the dimension of a common-venting system
Determine the vent diameter (D) and the total vent length based on the number of water
heaters installed. The total vent length (L) consists of the horizontal width (W) and the vertical
height (H). See the table below.
•
Total vent length (L)="H"+"W"
•
Vent diameter="D"
WARNING
•
A Non-Return Valve must be installed for each water heater.
This prevents
the escape of combustion gas through non-operating appliances.
•
For detailed instructions on the common-venting system, refer to the
instructions that are packaged with the vent parts or web site.
*Diameters of pipes are in accordance with Centrotherm's specifications.
**One elbow is equivalent to 1.5 m (5 ft.) linear length, and the maximum number of elbows is 5.
NOTICE
•
Regarding the clearances
between the exhaust
termination and the
intake termination, refer
to p.
20
to 22
.
•
Insert bird screen in
elbow terminals.
Common-venting system
Vent
Diameter*
(D)
Max.
No.of
water
heaters
Max. Vertical and
Horizontal
(Total) Vent Length** (L)
DIP switch settings
T-H3J-DV / 240H
T-H3S-DV / 340H
T-H3-DV / 540H
(Upper bank of DIP switches)
110 mm
(4 in. )
2
7.6 m (25 ft.)
No.6 : ON / No.7: OFF
No.3 : ON / No.4: OFF
125 mm
(5 in.)
2
15.2 m (50 ft.)
3
6.1 m (20 ft.)
160 mm
(6 in.)
2
30.5 m (100 ft.)
3
22.9 m (75 ft.)
4
15.2 m (50 ft.)
5
7.6 m (25 ft.)
6
6.1 m (20 ft.)
200 mm
(8 in.)
3
30.5 m (100 ft.)
4
30.5 m (100 ft.)
5
25.9 m (85 ft.)
6
19.8 m (65 ft.)
7
15.2 m (50 ft.)
8
12.5 m (41 ft.)
250 mm
(10 in.)
5
30.5 m (100 ft.)
6
30.5 m (100 ft.)
7
30.5 m (100 ft.)
8
30.5 m (100 ft.)
OFF
ON 1 2 3 4 5 6 7 8 9 10
OFF
ON 1 2 3 4 5 6 7 8
Installation
Installation Manual
"H"
Intake
Exhaust
"D"
Elbow terminal
Elbow terminal
"W"
Non-Return Valve
