Circulating Air Return - Truma Trumatic E 2400 Gebrauchsanweisung

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 (see brochure). Diagrams with op-
timum installation suggestions for hot air systems in all of the
most popular motor home models can be requested free of
charge via 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 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).
Warm air supply and circulating air return
with outside assembly
Refer to installation variants fig. 3 + 4 (page 2).
The warm air supply and the circulating air return between
appliance 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
conditions 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!
20
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 branch-
ing can also be mounted on the connection fitting (8), for the
further routing of the ducts VR (72 mm diameter), ÜR (65 mm
diameter) or ZR 18 (49 mm diameter).
In order to prevent overheating, 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.
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 (see brochure). Diagrams with op-
timum installation suggestions for hot air systems in all of the
most popular motor home models can be requested free of
charge via the Truma service centre.
Circulating air return
The appliance must be able to intake sufficient circulating
air through the opening (U). If the circulating air return takes
place inside a storage compartment, drill two holes (13) into it,
each measuring 75 mm in diameter or apply an appropriately
sized opening.