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Circulating air return
The circulating air is sucked
in again by the device, either
directly via an aperture
2
measuring about 150 cm
from the living room to the
instal lation room, or via sev-
eral smaller apertures with
the same surface area.
Gas connection
The operating pres-
sure of the gas supply
must correspond with the
operating pressure of the
device (30 mbar).
The 8 mm diameter gas sup-
ply pipe must be attached
to the connecting piece with
a cutting ring connection.
Carefully counterhold with
another spanner when
tightening!
The gas connecti on 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
removed again for servicing.
Keep the number of parting
connections in the gas sup-
ply line in rooms frequented
by people to a technically
feasible minimum.
The gas system must accord
with the technical and ad-
ministrative 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
rulings (in Germany, for ex-
ample, the DVGW worksheet
G 607 for motor vehicles or
G 608 for boats) must be
respected.
Water connection
For operating the water
heater it is possible to use
all pressure pumps and sub-
mergible pumps up to 2.8 bar,
also all mixing taps with or
without electrical switch.
Fig. H: When using immer-
sion pumps, a non-return
valve (33 – not included in
the scope of supply) must be
fitted between the pump and
the first branch point (arrow
points in direction of flow).
8
Fig. J: When using pressure
pumps with high switching
hysteresis, hot water may
flow back via the cold water
tap. As a means of prevent-
ing this backflow, we recom-
mend fitting a non-return
valve (34 – not included in
scope of supply) between
the outlet to the cold water
tap and the drain valve.
For the connection to the
water heater and electrical
safety/drain valve, always use
hoses which are resistant to
pressu re and hot water (e.g.
Truma wa ter heater hose
SBH, foodproof and pressure
resistant up to 3.5 bar) with
an inside diameter of 10 mm.
For rigid pipe routing (e.g.
John Guest System) Truma
can provide the water con-
nectors (42), the safety/drain
valve (36) and a non-return
valve (33 + 34) with a 12 mm
diameter inner connector as
special accessories.
When connecting to a central
water supply (rural or city
mains) or if using more pow-
erful pumps, a pressure re-
duction valve must always be
installed which prevents pres-
sures above 2.8 bar from de-
veloping in the water heater.
Route water ho ses as short
as possible and free of kinks.
All hose con nections must
be secured with hose clamps
(also cold water hoses)! The
thermal expansion of the
water can cause pressures of
up to 3.5 bar before the over-
pressure safety device in the
safe ty/drain valve reacts (also
in submergible pumps).
For fastening the hoses to
the wall or floor we recom-
mend using the hose clips
(part no. 40712-01), which
also permit frost-proof rout-
ing of water hoses on the hot
air distributor pipes of the
heater.
In order to guarantee
complete emptying of
the water content and ongo-
ing sealing tightness of the
water hoses on the device,
the screw connection ele-
ments provided must always
be used!
The elbow fitting (with ven-
tilation valve, fig. K) is con-
nected to the upper warm
water connection and the
second elbow fitting is
connected to the lower cold
water connection.
Always route all water
pipes in such a way
that they descend to the
safety/drain valve! There
shall be no guarantee
claims for damage caused
by frost!
Installation of the
electrical safety/
drain valve
The electrical safety/drain
valve must be installed in
the heated area in the direct
vicinity of the appliance,
in a place which is easily
accessible for the user.
When choosing the location,
make sure that the safety/
drain valve (36) is not in-
stalled in the vicinity of other
heat sources (e.g. power
packs)!
Fig. G: Drill a hole measur-
ing 18 mm in diameter in the
floor of the vehicle. Mount
drain hose on drain connec-
tion fitting and pass through
the floor. Fasten valve with
2 screws. Drain directly to the
outside at a position protected
against splash water (apply
splash guard, if necessary).
Routing of water
pipes
Fig. G: Connect the cold wa-
ter supply (35) to the safety/
drain valve (36). The direction
of flow is of no significance.
The water hoses must be
routed free of ten sion to en-
sure satisfactory operation of
the safety/drain valve!
Screw threaded elbow fitting
connection to the cold water
connecting pipe (lower pipe)
and elbow connection with
integrated ventilation valve to
the warm water connecting
pipe (upper pipe).
Fig. K: Slide on nut (37),
clam ping ring (38) and
O-ring (39). Join screw fitting
and connecting pipe and
tighten with nut (37).
Fig. H + J: Provide hose
connection (40) for cold wa-
ter supply between safety/
drain valve (36) and supply
on water heater.
Route the hot water supply
(41) from the elbow connec-
tion with integrated vent
valve (42) to the hot water
consumers.
Fig. K: Push the venting
hose, external diameter
11 mm (43), onto the hose
grommet of the venting valve
(44), and lay it to the outside
without any kinks. Ensure
that the bend radius is not
smaller than 40 mm.
Cut off breather hose approx.
20 mm beneath the vehicle
floor, at an angle of 45°
facing the direction of travel.
Installing the room
temperature sensor
When selecting the location,
bear in mind that the room
temperature sensor must not
be subjected to any direct
radiant heat. For optimum
room temperature regula-
tion, we recommend that the
room temperature sensor
be fitted above the entrance
door.
Please ensure that
the sensor is always at-
tached to a vertical wall.
1. Fig. M: Drill a hole 10 mm
in diameter.
2. Guide the connection ca-
ble through the drillhole from
behind and plug the cable
end to the sensor by means
of an insulated connector
plug (there is no need to be
concerned about polarity).
3. Slide in the room tempera-
ture sensor and lay the cable
end with the two insulated
connector plugs to the
heating electronics unit
(if required, extend this using
2
a 2 x 0.5 mm
cable).
The room temperature
sensor supplied must
be used. If this is not con-
nected, the heating system
will run at maximum output,
without it being possible for
the room temperature to be
controlled.
Installation of the
control panels
When using control panels
which are specific to the ve-
hicle or the manufacturer, the
electrical connection must
be established in accordance
with the Truma interface de-
scriptions. Any modification
made to the Truma compo-
nents pertaining to this will
lead to the invalidation of the
guarantee, as well as to the
exclusion of any claims for
liability. The installer (manu-
facturer) is responsible for
providing instructions for use
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