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Warm air distribution
Most of the warm air is fed into the floor area of the living
compartment via flexible warm air ducts.
Fig. 17
The 4 muffs on the unit are designed for the 65 mm diameter
ÜR duct (part no. 40230-00). Use only pressure-safe ducts
in compliance with Truma quality requirements. Other ducts
that do not meet our quality standard (particularly with regard
to crown pressure resistance, duct diameter and number of
grooves) must not be used.
If the warm air duct has to be subjected to a considerable
amount of bending immediately behind the warm air outlet
of the unit in confined spaces, we recommend the use of
the BGC 90° elbow (part no. 34091-01). This elbow makes
it possible to connect a ÜR warm air duct with a diameter
of 65 mm or a VR warm air duct with a diameter of 72 mm.
With a duct length of less than 2 m the air outlet must not
be installed higher than the warm air duct muff. With a duct
length of less than 50 cm, the duct must create a siphon be-
tween the muff and the outlet.
L ≤ 50 cm
Fig. 18
These measures prevent undesirable heating of the vehicle
due to convection (cowl effect) during operation in summer.
The ducts for warm air distribution must be inserted securely
into the muff. A clip is attached to each muff to provide a
more secure grip.
In order to prevent heat accumulation when using the
Combi D 6, all 4 warm air connecting pieces must be
attached. The cross-section of the hot air pipes must not be
reduced by pipe connections or the like. If an EN end outlet
that can be closed off is installed in one of the Combi D 6
warm air ducts (e.g. in the bathroom), a second outlet that
cannot be closed off must be installed in the warm air duct.
The warm air system is designed for each type of vehicle indi-
vidually, on a modular basis. An extensive range of accesso-
ries are available. Diagrams showing optimum hot air system
installation suggestions in all of the common caravan and
motor home models can be requested free of charge from the
Truma Service Centre.
Fuel connection
The heater requires diesel fuel, as per the Australian Fuel
Standard (Automotive Diesel). Operation with any form of
biodiesel is not permitted.
The fuel is extracted from the vehicle fuel tank (see fuel tank
removal kit).
Please only use the fuel hoses and lines that are included in
the scope of delivery for installation.
Permissible fuel line length
The maximum fuel line length at the intake side is 2 m,
and 6 m at the pressure side.
Safety instructions for routing fuel lines
Always cut fuel hoses and lines to length using a sharp knife.
The areas that have been cut must not be compressed and
must be free of burrs.
Fuel lines must be securely attached in order to prevent dam-
age and / or noise generation caused by vibration (recom-
mended spacing between attachment points approx. 50 cm).
Fuel lines must be protected from mechanical damage.
Route fuel lines so that vehicle twisting, engine movements
and the like do not adversely affect their stability.
Protect fuel-carrying parts from heat that may affect operation
(use suitable thermal protection hose made from fibre glass
fabric with aluminium lining).
Never route or secure fuel lines immediately adjacent to the
L ≤ 50 cm
exhaust ducts of the heater unit or the vehicle engine. If the
lines cross, maintain an adequate distance away from hot
components at all times – provide heat radiation protection
plates if necessary.
Do not leave gaps between fuel lines that are being con-
nected using a fuel hose. This prevents problematic bubble
formation.
Correct line routing
Incorrect line routing
(bubble formation)
Fig. 19
7
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