Eco-King HWB-299, Installation And Service Manual

Page: 44 / 124

E93.1801EN171 HWB installation manual 44
Sealed Combustion Air supply
When an air supply pipe is connected from the outside of the building to the water heater, the water heater will
operate as a sealed combustion water heater.
The air supply duct can be made of PVC, PP or Stainless steel
10.5.1 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.
10.5.2 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 water heater 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.
10.5.3 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 water heater air piping:
AIR INTAKE