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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, both for interior
installations and for external installations (in heaters with fresh
air operation 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).
The warm air (W) is blown out from the appliance, either di-
rectly 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 diam-
eter) or ZR 18 (49 mm diameter) can also be added on.
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 warm air system is designed for each type of vehicle
individually, on a modular basis. There is an extensive acces-
sories program available (refer to brochure). Diagrams with
optimum installation suggestions for warm air systems can be
requested free of charge from the Truma Service Centre.
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 com-
partment 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. 1 m in length)
and returned to the appliance. The storage compartment
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).
Warm air supply and circulating air return
with outside assembly
Refer to installation variants fig. 2 (page 2).
The warm air supply and the circulating air return between ap-
pliance and vehicle is provided by means of flexible air ducts
LF 18 (83 mm diameter, 60 cm in length). The air ducts can
be shortened as required. A protective casing over the entire
heater system protects it against damage and weather condi-
tions and simultaneously serves as insulation.
Connection of the ducts to the appliance
Remove the two protective gratings from the appliance. Coat
the two pipe pieces LF 18 (1) and the rein-forced ends (2) with
plastic body sealant and insert in the opening of the appliance
(W + U). Secure with two self-tapping screws (3). The duct
connection must be correctly assembled, otherwise splash
water can enter the appliance!
Assembly of the ducts at leadthroughs
Drill two openings 73 mm diameter (W + U). Coat the con-
nection fittings (4) on the flange with plastic body sealant and
screw on, at opening (U) place the protective grating (5) in
between.
Cut the two duct pieces LF 18 (6) to the required length, if nec-
essary, coat on the inside with plastic body sealant and slide
onto the connection (4). Secure with worm drive hose clip (7).
On the inside, screw on the connection fitting (8) over the
opening (W – can also be screwed together with the connec-
tion fitting on the out-side). With hollow double walls make
sure to seal the intermediate space.
Warm air distribution
Connect duct VR 80 (9) 80 mm diameter and secure with self-
tapping screw (10). The various parts for the duct branching
can also be mounted on the connection fitting (8), for the fur-
ther routing of the ducts VR 72 (72 mm diameter), ÜR (65 mm
diameter) or ZR 18 (49 mm diameter).
In order to prevent overheat-ing, at least one air passage
must always be kept open (swivel nozzle SCW 2). Secure
all duct connections with self-tapping screws. Fasten duct
with clamp.
19


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