Wacker Neuson HI750 Series, Operator'S Manual, Page: 100 / 144

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100
Maintenance HI750
9.5 Inspecting the Heat Exchanger
Introduction The heat exchanger consists of the combustion chamber and an attached series of
metal tubes. As intake air flows over the hot combustion chamber and tubes, it
collects heat. The heated intake air is then blown out of the supply ducts.
Reasons for
inspection A cracked or damaged heat exchanger is hazardous! Poisonous carbon monoxide
gas can escape from the heat exchanger and enter the clean air stream.
Combustible gases may also ignite the surrounding insulation material, causing a
fire.
To ensure a safe operating condition, the heat exchanger must be inspected
regularly for damage.
When Inspect the heat exchanger at least twice a year as part of the regularly scheduled
maintenance program.
Inspect the heat exchanger more often if any of the following conditions exist:
■
The machine has been transported or towed over extremely rough roads or
terrain.
■
The machine/towing vehicle has been involved in an accident.
■
The machine has been dropped.
■
There is visible damage to the heater shell or trailer components.
■
The burner has been improperly adjusted and is over-firing.
■
There is doubt about whether regularly scheduled maintenance has been
performed.
■
The safety systems have been bypassed by improper or modified wiring.
NOTICE: If the machine wiring has been altered, correct the wiring before
operating the machine.
Requirements
■
Power disconnected from the machine.
■
Machine cool. Do not inspect a hot heat exchanger.
■
Gas fuel supply disconnected from machines with gas burners. See topic
Connecting the Gas Line.
■
Assistant to aid in the inspection
■
Shop light or flash light
■
Inspection mirror
This procedure continues on the next page.
DANGER
Asphyxiation hazard. Gases escaping from a cracked or damaged heat exchanger
contain carbon monoxide (CO). This is a poison you cannot see or smell. CO can
kill you in minutes!
►
Do not operate the machine if it has a cracked or damaged heat exchanger.