11
Fig. 16
Connecting the exhaust double duct to the device
Compress exhaust duct (1) at its beginning so that the coils lie next
to each other. Slide clip (4 – claws toward unit) over exhaust duct
(1). Slide clip (7) onto combustion air infeed (5). Slide exhaust duct
(1) all the way onto connection (3). Slide exhaust duct clip (4) as far
as it will go (end position must be between claws of clip) and screw
in place. Slide combustion air intake duct (5) onto connection (6)
and secure with clip (7).
Fig. 17
Recirculated air intake
The circulated air is drawn in by the unit. This must have one large
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. 18
The circulated air inlets must be arranged such that exhaust from
the vehicle engine or the heater cannot be drawn in under normal
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 unit are designed for the 65 mm diameter
ÜR duct (part no. 40230-00).
Only Truma ducts are approved with the heating system and
must be used.
Use only pressure-safe ducts in compliance with Truma quality
requirements. Other ducts that do not meet our quality standard
(particularly 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.
Fig. 19
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 between the
connection and the outlet.
Fig. 20
These measures prevent undesirable heating of the vehicle due to
convection (cowl effect) during operation in hot water mode.
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.
For optimum warm air distribution, Truma always recommends
using the 4 warm air outlets of the heater. 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 four warm air outlets are being used, a closable end outlet
EN may be installed in one warm air branch. If
there are only 3 warm air outlets, it must be ensured that if a
closable end outlet is being used (e.g. bathroom) a second non-
closable nozzle must be installed in the warm air branch.
Gas connection
A gas pressure regulator has to be used, which ensures
gas supply at gas pressure level 2.75 kPa. The gas
supply’s operating pressure must be the same as the unit’s
operating pressure (see type plate). The gas installation must
comply with AS/NZS 5601.2.
The gas inlet connection on the Combi 2 E / 4 E CP plus (Australia) is
a 8 mm connection.
Prior to connecting the appliance make sure that the gas lines are
free from dirt, chips and such!
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