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UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
18 of 51
SECTION 8: AIR SUPPLY
8.1 Separated Combustion Installation
When installed as a separated combustion heater
(UHA[X]S), the air for combustion is drawn in from
outside the building. It is important to ensure that
there is adequate space around heater to provide air
for the axial air distribu tion fan.
8.2 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.
8.3 Building Ventilation
Where ventilation is required, air must be taken from
an outside point where it is not likely to be
contaminated or obstructed.
8.4 Outside Combustion Air Supply
If outside combustion air supply is required,
separated combustion model (UHA[X]S) 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
req
uired. 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.
8.4.1 Length Requirements
Follow the constraints listed on Page 12, Section 7.6.
WARNING
Explosion Hazard
Equipment must have access to
uncontaminated air at all times.
Failure to follow these instructions can result
in death, injury or property damage.