Permissible Duct Lengths; Gas Connection; Circulating Air Return; Assembly Of The Roof Cowl - Truma Trumatic C 3402 Installation Instructions Manual

Always install a new
O-ring following any
disassembly.
Permissible duct
lengths
Fig. A 1: For the wall cowl
the duct lengths can be rout-
ed from min. 70 cm to max.
100 cm as ascending duct in
whichever way required, or
descending by max. 5 cm.
Duct lengths of min. 100 cm
to max. 150 cm must be
ascending at an angle of at
least 45°.
Fig. A 2: Roof cowl duct
lengths of up to max. 230 cm
must be ascending at an an-
gle of at least 45°.
Connection of the
exhaust double duct
to the appliance
Fig. D: Press end of exhaust
duct (1) together so that win-
ding touches winding. Slide
clamp (4) over the exhaust
duct (1) and slide clamp (7)
over combustion air supply
duct (5). Slide exhaust duct
over the O-ring (2) onto the
connection fitting (3). Engage
clamp (4) and screw on. Slide
combustion air supply duct
(5) onto connection fitting (6)
and fasten with clamp (7).
Assembly of wall cowl
Fig. E: Choose a wall which
is as straight as possible and
which is well exposed to wind
from all directions. Drill an
opening of 83 mm diameter
(pack wood into any hollow
spaces in the area of the cowl
opening). Use the enclosed
rubber seal (8) for sealing. In
the event of structured sur-
faces coat with plastic body
sealant – do not use silicone!
Slide clamp (7) over the ducts
prior to passing the exhaust
double duct through the
opening.
Slide rubber seal (8) and
clamp (4) on the cowl inner
part (9). Press together end of
exhaust duct (1) so that wind-
ing touches winding, and
slide over O-ring (10) onto the
connection fitting (11) (bend
pointing up).
Engage clamp (4) with hole
on the upper pin (screw
pointing down) and tighten.
Slide combustion air intake
duct (5) on the serrated con-
nection fitting (12).
Fasten cowl inner part (9) with
6 self-tapping screws (14),
mount cowl outer part (15)
and fasten with 2 screws (16).
Fasten combustion air intake
duct with clamp (7), from the
inside, on the connection fit-
ting (12).
Fasten cowl double duct to
the wall with at least one
clamp ZRS (17).
Assembly of the
roof cowl
Fig. F: Select a part of the
roof which is as straight as
possible and which is well ex-
posed to wind from all direc-
tions. Drill an opening of
83 mm diameter at a center
distance of at least 65 mm to
the side walls (pack hollow
cavities in the area of the cowl
opening with wood). Sealing
is carried out with the en-
closed rubber seal (20) with-
out further sealing compound.
Slide rubber seal (20) on the
cowl part (21). Pass cowl from
above through the roof and
secure with retention ring (22).
Mount cowl cover (23) and
secure with two screws (24).
The exhaust outlets
(25) must be posi-
tioned crosswise to the direc-
tion of travel, the label
„FRONT" (26) must be fac-
ing in the direction of travel.
Slide clamp (7) over the ex-
haust gas double duct.
Press together end of ex-
haust duct (1) so that win-
ding touches winding and
slide over the O-ring (27) onto
the connection fitting (28).
Engage clamp (4) and tight-
en. Slide combustion air in-
take duct (5) onto the con-
nection fitting (29) and se-
cure with clamp (7).
Fasten cowl double duct to
the wall with at least 3 clamps
ZRS (17).
Fastening the
appliance
Bring appliance into installa-
tion position and, using the
three provided fastening bolts
B 5.5 x 25, ensure the appli-
ance is firmly connected to a
suitable base (sawn wooden
board, laminated wooden bat-
tens or metal base).
Warm air distribution
and circulating air
return
Heating air intake vents must
be arranged in such a way
that under normal operating
conditions exhaust gas from
the vehicle engine and heater
appliance cannot enter the in-
side of the vehicle. It must be
ensured by means of con-
struction design that the heat-
ing air introduced into the ve-
hicle is not polluted (e.g. by
oil vapour). This is achieved,
for example, with air heaters
with circulating air operation,
both for interior installations
and for external installations.
(In heaters with fresh air oper-
ation the fresh air is not to
come from the engine com-
partment or from the vicinity
of the exhaust or the exhaust
outlet of the heater.)
Warm air distribution
Most of the warm air is led
into the floor area of the liv-
ing compartment via flexible
warm air ducts.
The 4 connecting pieces on
the unit are designed for the
65 mm diameter ÜR duct
(Art. no. 40230-00). Only
pressure-proof air ducts that
comply with the Truma quali-
ty standard must be used.
Other ducts that do not meet
our quality standard (particu-
larly with regard to crown
pressure resistance, ducts di-
ameter and number of
grooves) must not be used.
In order to prevent
heat accumulation
when using the Trumatic
C 6002, all 4 warm air
connecting pieces must be
attached. The cross-section
of the hot air pipes must not
be reduced by pipe connec-
tions or the like.
With the Trumatic C 3402,
all four or only three of the
hot air outlets can be as-
signed. The unassigned hot
air outlet is closed off by
means of the closure cover
VD (Art. no. 40352-00).
The warm air system is de-
signed for each type of vehi-
cle individually, on a modular
basis. There is an extensive
accessories program avail-
able (refer here to our
brochure). You can obtain di-
agrams free of charge from
the Truma Service Centre,
showing optimal installation
suggestions for warm air sys-
tems in all current-type cara-
vans and mobile homes.
By using the 72 mm
diameter VR duct up to
the respective first air outlet,
the amount of noise is re-
duced. Remove reducing
sleeves from air outlet con-
nections and use U-clamp set
(Art. no. 34000-81800) when
connecting this pipe.

Circulating air return

The circulating air is sucked
in again by the device, either
directly via an aperture mea-
suring about 150 cm 2 from
the living room to the instal-
lation room, or via several
smaller apertures with the
same surface area.

Gas connection

The operating pressure
for the gas supply is
30 mbar (or 28 mbar butane/
37 mbar propane) or 50 mbar
and must correspond to the
operating pressure of the ap-
pliance (see name plate).
The 8 mm diameter gas sup-
ply pipe must be attached to
the connecting piece with a
cutting ring connection. Care-
fully counterhold with anoth-
er spanner when tightening!
The gas connection fitting on
the appliance is not to be
shortened or bent.
Prior to connecting the appli-
ance make sure that the gas
lines are free from dirt, chips
and such!
Route the pipes in such a way
that the appliance can be re-
moved again for servicing.
Keep the number of parting
connections in the gas supply
line in rooms frequented by
people to a technically feasi-
ble minimum.
The gas system must accord
with the technical and
administrative provisions
of the individual country of
use (in Europe, for example,
EN 1949 for motor vehicles
or EN ISO 10239 for boats).
National regulations and rul-
ings (in Germany, for exam-
ple, the DVGW worksheet
G 607 for motor vehicles or
G 608 for boats) must be re-
spected.
7