VENTING
CONNECTIONS
General
CAUTION: Proper installation of flue exhaust venting is critical for the safe and efficient operation of the boiler. For vent systems not shown in this section please contact your local authorized representative.
CAUTION: Stable vent pressure is critical to the safe and proper operation of the heater. A combination of barometric dampers, balancing dampers, extractors, or draft inducers may be required to stabilize the vent pressure.
Definition of Appliance Categories
Boilers are divided into four categories based on the pressure produced in the exhaust and the likelihood of condensate production in the vent.
Category I: A boiler which operates with a
temperature that avoids excessive condensate pro- duction in the vent.
Category II: A boiler which operates with a
Category III: A boiler which operates with a positive vent pressure and with a vent gas temperature that avoids excessive condensate production in the vent.
Category IV: A boiler which operates with a positive vent pressure and with a vent gas temperature that may cause excessive condensate production in the vent.
See Table J for vent category requirements for the Advanced Design Boiler.
NOTE: For additional information on appliance categorization, see appropriate ANSI Z21 Standard and the latest edition Standard of National Fuel Gas Code or in Canada, the latest edition of CSA Standard B149 Installation Code for Gas Burning Appliances and Equipment, or applicable provisions of local building codes.
A |
| |
D |
| |
B |
| |
V |
| |
E |
| |
N |
| |
T |
| |
I |
| |
N |
| |
G |
| |
A |
| |
R |
| |
R |
| |
A |
| |
N |
| |
G |
| |
E | Tight | |
M | ||
| ||
E |
| |
N |
| |
T | Tight | |
| ||
S |
|
NOTE: PVC or CPVC vent may be used in conjunction with CHX, special piping arrangement has to be made. Contact manufacturer for details.
Table J: ADB Category Determination for Venting Purpose and Venting Arrangement
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