SECTION 8: A
IR
S
UPPLY
17 of 59
SECTION 8: AIR SUPPLY
8.1 Separated Combustion Installation
When installed as a separated combustion heater
(UHA[T][M][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 distribution fan.
8.2 Building Ventilation
Where ventilation is required, air must be taken from
an outside point where it is not likely to be
contaminated or obstructed.
8.3 Outside Combustion Air Supply
If outside combustion air supply is required,
separated combustion model (UHA[T][M][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
required. Seal all combustion air pipe joints. The
outside air terminal must not be more than 1' (31
cm) above the vent terminal.
8.3.1 Length Requirements
Follow the constraints listed on Page 11, Section 7.5.
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.
Summary of Contents for UHAT 150
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Page 50: ...UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 42 of 59 14 1 General...
Page 65: ...SECTION 16 SPECIFICATIONS 57 of 59 16 4 Dimension Data for Models UHA T M X S 300 400...
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