SECTION 8: A
IR
S
UPPLY
17 of 55
SECTION 8: AIR SUPPLY
8.1 Separated Combustion Installation
When installed as a separated combustion heater
(UHD[T][M][X]S[R]), the air for combustion is drawn
in from outside the building.
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 (UHD[T][M][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 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 12, 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 UHD150
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Page 27: ...SECTION 9 GAS PIPING 19 of 55 Figure 13 Gas Connection...
Page 47: ...SECTION 14 TROUBLESHOOTING 39 of 55 14 1 General...
Page 62: ...UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL 54 of 55...
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