Fulton Caliber (CAL) Condensing Hydronic Boiler - Manual (Page 24)

© The Fulton Companies 2014
INSTALLATION
CAL-IOM-2014-0129
SECTION 2
2-18
 Common Air Intake and Exhaust Venting of
Multiple Boilers
Combining multiple Caliber boilers into a common pipe for
combustion air supply, exhaust, or both is only permitted on a
case by case basis and must be accomplished with a Fulton-
engineered solution.
Fulton Part No. 2-30-002018 Common Venting Kit can be
optionally installed at the factory on CAL-750 and CAL-850
models. The installation location is between the burner fl ange
and the blower motor. When the blower motor starts, it will
overcome the valve that is magnetically closed (See Figure
9). When the blower motor is is off , gravity will cause the
FIGURE 7 - COMBUSTIBLE WALL PENETRATION DETAILS
check valve to close and prevent fl ue gases from recirculating
through an idle boiler. This component is required when
Caliber boilers are common vented.
Adhere to the following:
1. The engineered solution must guarantee the
prevention of fl ue gases moving backwards through
idle boilers. This is important in preventing fl ue
gases from entering the mechanical room if sealed
combustion is not being used, as well as preventing
fl ue gases from corroding the heat exchanger or other
components within the boiler cabinet.
2. Caliber boilers cannot be common vented with other
types of equipment.