Extraction Air Supply; Circulated Air Intake; Warm Air Distribution - Truma Combi D4 CP plus ready Einbauanweisung

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
Fig. 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.
Fig. 15

Circulated air intake

The circulated air is drawn in by the heater. This must have
one large opening or several small openings with a total area
of at least 150 cm² between the living compartment (not the
rear storage space) and the installation compartment.
Fig. 16
The circulated air inlets 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.
Fig. 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
Fig. 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.
All 4 warm air outlets or just 3 warm air outlets can be used
with the Combi D4 CP plus ready (Truma recommends always
using all 4 warm air outlets for optimum warm air distribu-
tion!). If only three warm air outlets are needed, one of the
lower warm air outlets must be sealed with a blank cover VD
(part no. 34310-01). The blank cover must be firmly pushed
into the moulded part of the heater until it audibly engages
and is firmly seated. Check for firm seating.
If all four warm air outlets are being used, one closable
end outlet EN may be installed in one warm air branch.
If only three warm air outlets are being used, it must be
ensured that if a closable end outlet is being used (in a bath-
room, for example), a second non-closable nozzle is installed
in the warm air branch.
The warm air system is designed individually for each vehi-
cle type using the construction kit principle. A wide range of
accessories is available for this purpose.
L ≤ 50 cm
17