Installation instructions
3.6Venting
Danger: Do not combination vent this appliance with any other appliance.
Warning: Do not reduce the vent (exhaust and combustion) pipe sizes.
Warning: Failure to vent the exhaust gases to the outside with sealed stainless steel vent pipe
Warning: Do not mix vent pipe or joining methods from different manufacturers.
Caution: The vent system must be installed by a qualified individual or agency in accordance with these instructions. If improperly installed, a hazardous condition such as fire or carbon monoxide poisoning could result. Bosch Thermotechnology Corp. will not be responsible for improperly installed appliances.
3.6.1Vent material and specifications
Establish vent clearances that comply with the vent manufacturer's specifications. In all cases follow local codes.
Note: Listed thimbles or collars are necessary to pass through wall and ceiling partitions. If the vent system passes through combustible areas where the vent clearance requirements cannot be maintained, it is permissible to chase straight sections of sealed 3 inch single wall vent through 4 inch (or greater)
Warning:
Vent lengths
The appliance should be located as close to the point of termination as possible.
The maximum equivalent exhaust length is 39 feet with one 90 degree elbow. Subtract 6 feet for each additional 90 degree elbow used (a maxi-
mum of four elbows are permitted in the exhaust vent)1).
The maximum equivalent inlet air supply pipe
length is 39 feet with one 90 degree elbow. Sub- tract 3 feet for each additional 90 degree elbow used (a maximum of four elbows are permitted in the inlet air supply)2).
Horizontal section of vent must pitch upward from heater 1/4" for every foot of horizontal length, to prevent the pooling of condensate, and be supported at 4 foot intervals with overhead hangers. See Table 3. The last horizontal run including the termination must be sloped to the outside 1/4" per foot to prevent rain from entering the venting system.
| Diam. | Max. | Material |
|
| equivalent |
|
|
| length |
|
Exhaust | 3 inches | 39 feet with | Sealed stainless |
Vent |
| 1 elbow | steel |
Intake | 3 inches | 39 feet with | Aluminum flex, |
Vent |
| 1 elbow | PVC or any other |
|
|
| rigid or semi rigid |
|
|
| sealed 3” pipe |
Table 3 Venting Specifications |
| ||
| The minimum exhaust vent length is | ||
| 3 feet. |
| |
| The use of a 90 degree elbow is | ||
| equivalent to 6 ft in vent length. | ||
| The use of 45 degree elbow is | ||
| equivalent to 3 ft in vent length. | ||
Fig. 12 Minimum exhaust vent length
1)or subtract 3 feet for each 45° elbow used
2)or subtract 1.5 feet for each 45° elbow used
6 720 607 909 | 13 |
