20
Ventilation and extraction
A correct installation is important for correct operation of the appliance to ensure,
there is no build-up of heat at the back of the appliance. This heat must be allowed
to escape into the open air.
In the event of high ambient temperatures, full performance of the cooling unit
can only be achieved by means of adequate ventilation and extraction.
6.3
Correct mounting of the lower ventilation grille facilitates the access to
the electrical and gas connections during maintenance work.
Installation of lower and upper ventila-
tion grilles (L500).
Installation of lower ventilation
grille (L500) with roof exhaust (R500).
L500
L500
10-20mm
Stopper
strip with
profiled
joint
Stopper
strip with
profiled
joint
Stopper
strip with
profiled
joint
Stopper
strip with
profiled
joint
Minimum
height
of
ventilation
Minimum
height
of
ventilation
L500
R500
10-20mm
Minimum height of ventilation ( mm)
H
The unit is ventilated through openings in the wall or roof of the vehicle.
(Fig. 1 and Fig. 2). Fresh air enters at the bottom and the warmed air flows off
through the upper ventilation grille (flue effect). The side walls of the ventilation
shaft should be local to avoid the build up of condensation and drafts. The parts of
the shaft walls, which are situated above and next to the exhaust for the combus-
tion gases, must be made of highly inflammable material. The
upper
ventilation gril-
le should be positioned as high as possible above condenser (
A
)
(observe mini-
mum ventilation heights)
. The
lower
ventilation grille should be
flush with the
floor of the vehicle
, allowing any gas leakages (heavier than air) to escape directly
into the open air. If such an arrangement is not possible a hole must be provided
under the refrigerator (not close to the burner) so that any leaking LP gas can esca-
pe. This must have an effictive area of at least 13cm². It is desirable to fit the hole
with wire mesh or similar, and an angle plate to protect it from stones, mud etc., the
wire mesh must not reduce the effective area of 13cm
2
(EN1949).
The ventilation
grilles must have a free cross section of at least 400cm
2
. Here it should be
noted that protective insect nets behind the ventilation grilles can reduce the free
cross section by up to 50%.
Fig.2
Fig.1
A.
J
JJ
JJ
J
Roof exhaust R500
Lower ventilation L500
1250
B.
J
JJ
J
Upper ventilation L500
Lower ventilation L500
1400
C.
J
J
Upper ventilation L500
Lower ventilation L205
(no mosquito net)
1400
H
H
A
A
