Recirculated Air Intake; Warm Air Distribution; Gas Connection - Truma Combi 4 Einbauanweisung

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.
The circulated air inlets must be arranged such that exhaust
from the vehicle engine or the heater cannot be drawn in un-
der normal operating conditions. It must be ensured by means
of construction design that the heating air introduced into the
vehicle is not polluted.

Warm air distribution

Most of the warm air is led into the floor area of the living
compartment via flexible warm air ducts.
The 4 connecting pieces 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 require-
ments. Other ducts that do not meet our quality standard
(particularly with regard to crown pressure resistance, ducts
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 pos-
sible 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
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.
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– Combi 6 (E):
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 6 (E)
warm air ducts (e.g. in the bathroom), a second outlet that
cannot be closed off must be installed in the warm air duct.
– Combi 4 (E):
With Combi 4 (E), all four or only three hot air outlets can be
occupied (Truma always recommends four hot air outlets for
optimal distribution of warm air!). If only three hot air outlets
are needed, one of the lower hot 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. Please check
that the cover is firmly seated.
If using four hot air outlets, a closable end outlet EN
may be installed in one hot air branch. If just 3 warm
air outlets are being used, it must be noted that a second
nozzle that cannot be closed off must be installed in the
warm air duct if an end piece that can be closed off is being
used (e.g. in the bathroom).
The warm air system is designed for each type of vehicle indi-
vidually, on a modular basis. There is an extensive accessories
program available. Diagrams showing optimum hot air system
installation suggestions in all of the common caravan and mo-
tor home models can be requested free of charge from the
Truma Service Centre.

Gas connection

The gas supply's operating pressure (30 mbar) must be the
same as the unit's operating pressure (see type plate).
Choose to route the pipes in a way that will facilitate removing
the unit for service tasks.
The gas supply line (8 mm dia.) must be attached to gas-con-
nection muff (20) with olive screw fitting (19 – included in
delivery). Carefully counterhold with another spanner when
tightening!
Gas-connection muff (20) on the unit may not be shortened
L ≤ 50 cm
or bent.
Prior to connecting the appliance make sure that the gas lines
are free from dirt, chips and such!
Keep the number of parting connections in the gas supply
line in rooms frequented by people to a technically feasible
minimum.
The gas system must comply with the technical and
administrative regulations of the respective country of use
(e.g. EN 1949 in Europe).
The national legislation and regulations (e.g. DVGW Work
Sheet G 607 for vehicles in Germany) must be observed.
In order to prevent heat accumulation when using the
Combi 6 (E), all 4 warm air connecting pieces must be
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