Sealed Combustion Air Supply; Combustion Air Quality; Air Supply Through Humid Areas; Air Intake/Vent Connections - Slant/Fin VGH-299-CH Installation And Service Manual

Sealed Combustion Air supply

When an air supply pipe is connected from the outside of the building to the boiler, the boiler will operate as a
sealed combustion boiler.
The air supply duct can be made of PVC, PP or Stainless steel
9.5.1 C
OMBUSTION AIR QUALITY
Combustion air must be free of contaminants. Do not install the intake for the combustion air venting in an area
which contains corrosive or other contaminants as outlined in section 9.6 tables 9-12 and 9-13
9.5.2 A
IR SUPPLY THROUGH HUMID AREAS
When the combustion air pipe will run through an area with high humidity (for example: greenhouses), a double
walled supply pipe or an insulated duct must be used to prevent the possible condensation on the outside of the
pipe. It is not possible to insulate the internal air pipes of the boiler and therefore condensation at the internal air
canals must be prevented.
When the intake combustion air is terminated vertically through a roof an approved termination designed to
prevent water from entering into the combustion air pipe must be used.
9.5.3 A /
IR INTAKE VENT CONNECTIONS
Combustion air intake connector (fig. below). Used to provide combustion air directly to the unit from outdoors. A
connector is provided on the unit for final connection. Combustion air piping must be supported per guidelines
listed in the National Mechanical Code, Section 305, Table 305.4 or as local codes dictate.
Near boiler air piping:
38
:
AIR INTAKE
E93.1601EN032.C VGH installation manual
Figure 9-3