9
Warm air distribution and circulating air
return with interior installation
Warm air distribution
Hot air suction apertures must be arranged in such a way that
no exhaust gases from the engine or the heating device can
be drawn in. It must be ensured by means of construction
design that the heating air introduced into the vehicle is not
polluted (e.g. by oil vapour). This is achieved, for example,
with air heaters with circulating air operation.
Only use original Truma parts for ducting, outlets, fit-
tings and accessories, supplied by Dometic or Truma.
Do not use any other parts.
The warm air (W) is blown out from the appliance, either
directly or using a warm air duct VR 80 (80 mm diameter).
Remove grating from warm air outlet of the appliance. Con-
nect duct VR 80 (80 mm diameter). By positioning a manifold
section, the ducts VR 72 (72 mm diameter), ÜR (65 mm dia-
meter) or ZR 18 (49 mm diameter) can also be added on.
Use the following table to determine the number of required
air openings in the warm air duct.
Duct length* Number of air openings
up to and
including 1 m
at least 1 air opening
over 1 m
up to 5 m
at least 2 air openings
(the first air opening after max. 1 m)
5 m a more
at least 3 air openings
(the first air opening after max. 1 m)
* In the case of duct branches, the sum of the installed warm
air ducts.
In order to avoid overheating, there must be
at least
one air passage which is always open
(swivel
nozzle SCW 2).
Secure all duct connections with self-tapping screws. Fasten
ducts with clamps.
The hot air system is individually designed for each vehicle
model using a modular principle. A wide range of accessories
is available for this purpose.
Circulating air return
The circulating air (U) is sucked back into the appliance, either
directly or via a duct piece VR 80 (80 mm diameter).
1. Direct intake: If the appliance is installed in a storage
compartment or such, drill two holes measuring 75 mm in
diameter into it, or make a corresponding opening for the
circulating air return.
Do not obstruct the air passage to the appliance!
2. Circulating air outside the storage area can be drawn in via
a duct piece VR 80 (1) 80 mm diameter (max. 100 cm in
length) and returned to the appliance. The storage compart-
ment can then be used to the full.
Remove protective grating from the connection fitting (3).
Insert duct piece (1) into the grating connection fitting and
fasten using the available screws. Attach swivel nozzle SCW 2
to the duct end (4).
min 0.5m
max 1m
3
1
4
W
U
Fitting the control panel
Any modification made to the Truma components
pertaining to this will lead to the cancellation of the
guarantee and to the exclusion of any claims for liability.
The installer (manufacturer) is responsible for providing oper-
ating instructions for the user as well as for the labelling of
the control panels!
When selecting the location, take note that the control panels
must not be subjected to any direct radiant heat. Length of
the connection cable 4 m or 10 m.
Selecting the position of the thermostat is very impor-
tant, the reading of the air temperature is taken by the
thermostat, therefore the position of the thermostat needs
to be considered. The thermostat must be placed in an area
away from sunlight or any external source of heat. The posi-
tion should be chosen to represent the average air tempera-
ture experienced inside the vehicle.
If installation is only possible behind curtains or in similar
locations with temperature fluctuations, a remote sensor for
the ambient temperature must be used (Accessories).
Installing the control panel with rotary switch
If flush mounting is not possible, Truma will supply an
on-surface frame (1 – part no. 40000-52600) as an ac-
cessory on request.
Drill a hole Ø 55 mm in diameter.
Plug the control panel cable (2) into the control panel (3) and
then fit the rear cover cap (4) as a stress-relieving device.
Push the cable through to the rear and lay it to the electronic
control unit.
Secure the control panel with four screws (5) and fit the cover
frame (6) in place.
Truma offers side parts (7) in eight different colors for
finishing the cover frames (6) in a visually pleasing way.
Please ask your dealer.
Ø 55 mm
2
7
7 6
1
3
5
4
Trum
atic E
3
1
4
5
2
