IC Bus CE Series 2020, Operation And Maintenance Manual

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Climate Controls
Description
The auxiliary heater system consists of a fuel fired coolant
heater, coolant plumbing, and wiring. The coolant plumbing
connects the coolant heater to the engine and body heating
system. The coolant heater location will vary, but is typically
mounted on the left frame rail near the front of the bus. A fuel
line is connected to the fuel tank to supply the coolant heater. An
exhaust tube is routed from the coolant heater out the left-side
of the bus.
When turned ON, fuel is supplied to the coolant heater and is
ignited by a glow pin that establishes a flame that heats the
coolant. The heated coolant is circulated through the bus coolant
system and the engine block.
NOTE: The coolant heater is also equipped with safety
features such as a flame sensor, temperature sensor, and
overheat sensor that constantly monitor the coolant heater
and will shut down if any problems occur.
Operation
WARNING
To prevent personal injury and / or death, or
damage to property, the auxiliary heater system
must be OFF before filling any fuel tank or
moving the vehicle into an enclosed area where
combustible fumes may be present.
WARNING
To prevent personal injury and / or death, or
damage to property, the auxiliary heater system
must not be operated in garages or other
enclosed areas without properly venting the
heater unit exhaust to the outside.
WARNING
To prevent personal injury and / or death, or
damage to property, the use of this auxiliary
heater system requires that the engine coolant
be of a proper mixture so as to prevent
freezing or slushing.
Refer to the engine
manufacturer's manual for specific coolant
mixture recommendations. Frozen or slushy
coolant can cause a blockage leading to rapid
pressure buildup in the system hoses.
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