Carrier 42ET Manuel D'installation, D'utilisation Et D'entretien page 34

3 - INSTALLING THE UNIT
3.1 - Installing the unit in a
suspended ceiling
The positioning of the unit must not create an obstacle
that may lead to an unequal distribution and/or return
flow of the air. The ceiling must be sufficiently even to
allow simple installation of the unit, with no risks. The
supporting structure must be able to carry the weight of
the unit and prevent deformation, breaks or vibrations
during operation.
INSTALLATION PRECAUTIONS: During the
installation process, remove all debris and
construction material from the ducts to prevent any
damage to the unit.
3.2 - Installation procedure
NOTE: the fan coil units are delivered upside down
when stacked on a pallet.
- Position the unit close to where it is to be installed
in the ceiling void. For installation in a suspended
ceiling use a hydraulic lift and a folding ladder to
make the task easier (Fig. 7).
- Check that the clearances around the unit are
sufficient to allow easy maintenance. Please refer
to the diagram that shows the service clearances.
- Mark the position of the threaded hangers on the
ceiling (if several units need to be installed, it may
be advisable to produce a drilling template). The
method of fixing the threaded hangers (not
supplied) depends on the ceiling type (maximum
diameter of the threaded hangers is 10 mm). Once
the threaded hangers are fixed to the ceiling,
tighten the first nuts.
WARNING: When moving the units, do not use water
pipes, condensate drain pan, valves or flexible pipes
to lift them.
The "without filter" unit must be connected to air
ductwork.
It is forbidden to operate the unit without any filter
and with a free air inlet at the same time.
Lift the unit and align it on the threaded hangers, insert
the second nuts and tighten them slightly.
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NOTE: At this point do not tighten the nuts fully and
do not clamp the unit up to the ceiling (leave a space
between the ceiling and the unit). The nuts will be
adjusted finally, when the unit has been connected
to the pipework and ducts and levelled.
Level the unit (Figs. 8 and 9).
Adjust the hanger nuts so that the unit is inclined 0.5 %
towards the condensate drain pan. At the other end (air
flow direction) the unit must be perfectly level (Figs. 8
and 9).
Condensate drain pipe (Fig. 10): Use a flexible pipe with
an inside diameter of 16 mm and provide a constant fall
of 20 mm/m over the whole horizontal pipe run. Install
a 50 mm (minimum) siphon to prevent gases and odours
from flowing back into the ceiling void.
WARNING: After connecting the drain pipe, check
its clamping and make sure there is no water
leakage.
If several units are connected to a common collector, a
device must be installed (Fig. 11). Before operating the
unit, ensure that the water flows into the internal
condensate drain pan by pouring some water into it. If
problems are detected, check the drain pipe slope and
look for possible obstructions. In all cases the
connection duct(s) at the unit outlet must be insulated
to prevent any condensate formation on the walls.
NOTE: The pressure losses of these ducts must be
compatible with the unit performance. The duct
must be as smooth as possible. Avoid sharp bends.
Check that there are no leaks or kinks, and that there
is no dirt or installation debris inside the ducts.
Debris within the ducts might damage the fan wheel
and the damper in the air diffusers.