5-6 Other Features
PA-1628Operator's ManualH3-45 COACH
then passes over a catalyst, the ammonia reacts
with the NOx to form nitrogen and water vapor.
The basic elements of the SCR system consist of a
15.9 gallons (60 liters) DEF tank complete with
pump, lines and heating system, a dosing injector, a
catalytic converter and the control and monitoring
system.
Diesel Exhaust Fluid (DEF)
When handling DEF solution, keep electrical
connectors properly connected or well capped,
otherwise there is a risk that the DEF will cause
oxidation that cannot be removed. Water or
compressed air will not help, since DEF quickly
oxidizes certain metals. If a disconnected connector
comes into contact with the DEF solution, it must be
replaced immediately to prevent the DEF solution
from creeping further into the copper wiring, which
takes place at a speed of about 2.4 in (60 mm) per
hour.
CAUTION
Diesel Exhaust Fluid (DEF) is a nontoxic aqueous
solution of urea (32.5%) and ultra- pure water
(67.5%). Urea is a compound of nitrogen that turns
to ammonia when heated. The fluid is non
flammable, and is not dangerous when handled as
recommended. However, it is highly corrosive to
certain metals, especially copper and brass.
When detaching hoses and components, do not
spill DEF on disconnected or unsealed connectors.
If DEF is spilled on a disconnected or unsealed
connector, the connector must be removed
immediately and replaced.
Things to know about spilt diesel exhaust fluid
(DEF):
l If urea solution comes into contact with the
skin, rinse with plenty of water and remove
contaminated clothing.
l If urea solution comes into contact with the
eyes rinse for several minutes and call for
medical help if necessary.
l If inhaled breathe fresh air and call for medical
help if necessary.
l Do not allow the DEF solution to come into
contact with other chemicals.
l The DEF solution is not flammable. If the
DEF solution is exposed to high
temperatures, it breaks down into ammonia
and carbon dioxide.
l The DEF solution is highly corrosive to
certain metals, including copper and
aluminum.
l If the DEF solution is spilled onto the vehicle,
wipe off the excess and rinse with water.
Spilled DEF solution can form concentrated
white crystals on the vehicle. Rinse off these
crystals with water.
CAUTION
DEF freezing and expansion
DEF will begin to crystallize and freeze at 12°f (-
11°c). DEF expands by approximately 7% when
frozen. During freezing weather, do not store a
DEF container on the coach unless it is designed
to allow for expansion.
Make sure the DEF container is not completely
full. DEF expansion may split an inappropriate
container, causing a spill and corrosion as a result.
WARNING
DEF spilt onto hot components will quickly vapor-
ize. Turn your face away!
Diesel Exhaust Fluid Consumption
DEF consumption is related to fuel consumption. In
order to meet EPA requirements, DEF tanks are
sized so one refill will be necessary every two refill of
the fuel tank.
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