Extraction Air Supply; Circulated Air Intake; Warm Air Distribution - Truma Combi D 6 Installation Instructions Manual

Fit air intake muffler to heater
Route air intake muffler (7) such that electrical connec-
tions remain accessible.
– Slide clamp (25) onto air intake muffler (7).
– Slide air intake muffler (7) onto connection (26) as far as it
will go and secure with clamp (25).
7
26 25
Figure 14

Extraction air supply

The cooling air (extraction air) that is needed to operate the
burner is drawn from the vehicle interior via a fan in the wall
cowl. The openings of this air extractor must be kept clear so
that air can enter at all times.
Figure 15

Circulated air intake

The circulated air is drawn in by the heater. This must have
one large opening or several smaller openings with a total
area of at least 150 cm² between the living compartment (not
the rear storage space) and the installation compartment.
If a grid (not supplied) is installed, (figure 10), the same require-
ments must be complied with for drawing in air in terms of the
cross sectional area through which flow occurs (150 cm²).
Figure 16
The circulated air intakes must be arranged such that exhaust
from the vehicle engine or the heater cannot be drawn in
under any operating conditions.
Structural measures must be taken in order to ensure that the
heating air that is led into the interior of the vehicle cannot be
contaminated.

Warm air distribution

Most of the warm air is led into the floor area of the living
compartment via flexible ducts.
The 4 connections on the heater 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 requirements (particularly crown pressure resistance,
duct diameter and number of grooves) must not be used.
Figure 17
If the warm air duct has to be subjected to a considerable
amount of bending immediately behind the warm air outlet
of the heater 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 connection. With a
duct length of less than 50 cm, the duct must create a siphon
between the connection and the outlet.
L ≤ 50 cm
Figure 18
These measures prevent undesirable heating of the vehicle
due to convection (cowl effect) during hot water operation.
The ducts for warm air distribution must be firmly inserted
into the connections. A clip is attached to each connection to
provide a more secure grip.
In order to prevent heat build-up in the heater, warm air
ducts must be attached to all 4 warm air connections.
The cross-section of the warm air ducts must not be reduced
by duct connections or the like. If a lockable EN end outlet is
installed in a warm air branch (e.g. in the bathroom), a second
unlockable nozzle should be installed in this warm air branch.
The warm air system is designed individually for each vehicle
type using the modular design principle. A wide range of ac-
cessories is available for this purpose.
L ≤ 50 cm
17