SECTION 7: A
IR
S
UPPLY
15
SECTION 7: AIR SUPPLY
7.1 Separated Combustion Installation
When installed as a separated combustion heater
(UHD[X]S[R]), the air for combustion is drawn in
from outside the building.
7.2 Unvented Installation
It is important to ensure that there is adequate fresh
air supply at all times for both combustion and
heating requirements in accordance with local and
national codes.
WARNING:
Combustion by-products contain a
chemical known to the State of California to cause
cancer and birth defects or other reproductive harm.
7.3 Building Ventilation
Where ventilation is required, air must be taken from
an outside point where it is not likely to be
contaminated or obstructed.
7.4 Outside Combustion Air Supply
If outside combustion air supply is required,
separated combustion model (UHD[X]S[R]) heaters
must be used.
Caution:
If the building has a slight negative
pressure or corrosive contaminants such as
halogenated hydrocarbons are present in the air, an
outside combustion air supply to the heater is
required. Seal all combustion air pipe joints.
The flexible air duct may have to be insulated to
prevent condensation on the outer surface. The
outside air terminal must not be more than 1' (31
cm) above the vent terminal.
7.4.1 Length Requirements
Follow the constraints listed
on Page 10, Section
6.7
.
