Location And Assembling; Choice Of Location - Carrier 50EN Installation, Operation And Maintenance Instructions

Packaged rooftop units
8. L
OCATION AND ASSEMBLING

Choice of location

When choosing the location, whatever may be the selected fashion, the
following precautions have to be taken into consideration:
- It is mandatory to comply with norm UNE-EN 378-3 on Safety
and Environmental Requirements. Part 3: "In situ" installation and
protection to people.
- It is necessary to check that the structure supports the unit's weigh
(please see the weight in the table in the "Weight summary" section).
- The area where the unit will be located must be perfectly accessible
for cleaning and maintenance operations (check minimum free space
for maintenance). Leave enough space for air circulation around the
unit.
- Since the unit is designed to work outdoors, some specifi c installation
norms must be followed:
• The unit will be located on the roof of the premises. If it is foreseen
that it will work more on heating than on cooling, it is preferable to
direct the coil towards the sun. If little work on heating is foreseen,
choose North direction.
• Avoid placing obstacles in the air supply or return. No obstacle
may impede the air aspiration into the coils. Do not fi x the outdoor
coil side in the predominant wind direction.
• Do not install the unit in a closed enclosure or in conditions that
originate air recirculation.
• The chosen location must not fl ood and must be above the average
height the snow reaches in that region.
Preparation of the ground
It is necessary to ensure that the surface where the unit is going to
be installed in completely fl at. Any defect in the preparation of the unit
support surface translates into stresses on the structure, which may
result in its deformation.
These units can be installed on the fl oor or on a brick frame or steel
profi le. Based on the fi xing solution defi ned in the installation project,
it will be necessary to plan the placement in the base of threaded
rods in the expectation that the unit supports can be fi xed later on. To
do so, it is recommended that a template be made with the heights
corresponding to the fi xings.
Foresee appropriate damping devices in these fi xings to
ensure that noise and vibration transmission is avoided (refer
to the section "Anchorage for antivibrators").
Antivibrators assembly (silent-blocks)
Although the installer is the one who must decide on a case-by-case
basis the best way to place the unit in the ultimate location, always in
observation of the handling standards that have been described, below
is a proposed assembly sequence that may facilitate the operation,
keeping in mind that the sequence performed in the installation shall
be the one most suitable to the solution chosen for each particular
case based on the existence (or lack thereof) of brick frames, type of
silent-blocks used, etc.
10
In the event of assembling directly on silent-blocks to the ground, it is
recommended that a template of the unit's footprint with the anchoring
points of the silent-blocks be made, as described in the previous section.
With the help of the crane or the forklift truck, the unit will be raised to
a suffi cient height that the silent-blocks can be screwed into its base.
The 4 silent-blocks of the corners must remain oblique and the interiors
perpendicular to the unit.
M12 metric threads have been provided for their placement in the
supports indicated in the following section "Anchorage for antivibrators".
A hex key 19 or Allen wrench 10 will be used for this operation based
on the type of screw used.
This image shows how the
silent-block option that can
be supplied for this unit is
fi xed to the unit.
Preassembly roofcurb (optional)
Optionally, standardised pre-assembly roofcurb made of galvanised
steel panelling with polyester paint and thermally insulated with
adjustable heights can be supplied.
Important: All of the necessary information for the installation of these
roofcurbs is available in the specifi c instruction brochure on roofcurbs,
(supplied with the roofcurb).
Regulation
system