ITR Hurricane Zephyr HW, Installation And Operating Manual

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Section 10. Troubleshooting
International Thermal Research
10-11
usually caused by the wrong fuel to air mixture. This can be
affected by the following:
Low voltage
High altitude
Dirty compressor air filter
Low compressor air output
Restricted combustion air flow (intake hose / exhaust hose /
combustion chamber)
Low combustion fan output (defective motor / wrong rotation /
dirty fan blade)
Partially clogged grooves in nozzle distributor
10.23 A Silent Killer
The American Boat and Yacht Council Inc. (ABYC) states:
Section 5.111: "Where heater is installed in an engine or bilge
space, 100% fresh air shall be supplied for combustion.
Section 6.1: "Burners shall be of the mechanical draft type which
employs a power-driven fan, blower or other mechanism
supplying air for combustion."
This means 100% fresh combustion air must be mechanically
delivered through a sealed duct directly to the heater from
outdoors. This is the recommended procedure no matter where
the heater is installed. When combustion air is drawn from an
unventilated heated space, the heater flame will become
increasingly yellow as the oxygen in that space is consumed. An
oxygen-starved flame produces excessive carbon monoxide (CO),
some of which can easily escape the exhaust.
Carbon monoxide is a colorless, odorless, tasteless gas produced
any time you burn a carbon-based fuel such as gasoline, wood,
charcoal, kerosene, propane, or diesel. It disperses freely in the
air and can accumulate in enclosed spaces or air pockets. RV
owners and boaters are especially vulnerable to the dangers of CO
because these vehicles have gas or diesel engines, as well as fuel-
burning appliances, and their enclosed spaces can accumulate CO.
CO is a cumulative poison; it can have fatal effects even at low
concentrations. It is absorbed by your lungs like oxygen, and
attaches to your red blood cells. When your blood can no longer
transport sufficient oxygen to the brain and other tissues, you
essentially asphyxiate.