8
3 Putting into Service
3 Putting into
Service
3.1
General
Notes
Following the installation
of
the heater, the vehicle's
fuel supply system
is
to
be
thoroughly bled. The ve-
hicle manufacturer's directions are to be observed
when so doing.
During a trial
run
of
the
heater, all connections are to
be
checked for leaks
and
security. Should the heater
fail during operation, troubleshooting is to be per-
formed
in
accordance with chapter
4.
All
electrical components
can
be
checked after the cap
(of wiring harness)
has
been removed.
3.2 Bleeding the Fuel Sypply
System
When the heater
is
switched on, the metering pump
must first fill
the
entire fuel supply system. If combus-
tion
is
not established during the first start-up phase
(incl. repeated start-up),
the
heater may have
to
be
switched off
and
then
on
again (several times, if
necessary).
NOTE:
Owing to the
low
fuel consumption repeated switching
on
is required
to
fill
the
fuel line.
Rapid filling of the fuel line can also
be
accomplished
as
follows:
- connect the positive conductor
of
the metering
pump to the +30 terminal via pushbutton switch
(e.g. order no. 375.004) (see Fig.)
- repeated switching on and off causes the fuel
metering pump to operate until the line is filled
In
the event
of
an empty line owing to a completely
empty fuel tank the heater should
be
started repeated-
ly
only with the vehicle engine running
in
order
to
keep
battery drain to a minimum.
3.3 Checking Proper Combustion
After the heater has been subjected
to
a trial
run
- also
after a replacement of the combustion air fan -
the
CO2
content
in
the exhaust gas
is
to be measured (correct
voltage
to
be observed).
Should the measured CO2 value exceed the tolerance
range (see sect. 6.1.3)
the
combustion air fan must be
checked (see sect. 6.1.2) or the fuel supply
rate
measured (see sect. 6.2.1
).
When replacing
the
com-
bustion air fan (drive unit) and/or the metering pump,
the
CO2
value must be checked and readjusted,
if
necessary (see sect. 6.1.3).
pushbutton switch
metering pump
fuse
~<>1'
+30
D
(~)
I••
8A
e.g. 375 004
~
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