Carrier 42NC, Installation, Operation And Maintenance Instructions, Page: 11 / 20

3 - HANDLING
For your safety, wear protective gloves!
Warning : the unit must be handled with care and stored flat.
Impacts may cause damage to the frame or the body of the unit
and adversely affect its main functions and its appearance.
REMOVING AND REFITTING THE CASING
When installing the unit, the casing must be removed and
replaced in its original packaging, to protect it from any risk of
scratching. The protective electrostatic casing film must always
be removed before the casing is finally repositioned.
To remove the casing (fig. 4):
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Standard model, return air underneath (42NC):
Remove the two ¼ turn screws on the lower section of the
casing (a). Then swivel the lower section towards you and
lift the casing.
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Front return air model (42NR):
Remove two ¼ turn screws and the grille. This gives
access to the two ¼ turn screws in the casing; remove
them, then swivel the lower section towards you and lift the
casing.
Note :
if the unit is equipped with a control with flush-mounted
terminal, remember to disconnect the quick-release connector,
accessible on the side on top of the electrics box.
To refit the casing (fig.4)
- Position the casing so that it leans at an angle (lower part
towards you) making sure that the central lug (B) is correctly
centred
- Adjust the rear lugs on the rear panel of the frame (A),
- Return the casing to an upright position so that the brackets on
the frame clip into the feet on the casing (C).
INSTALLING THE UNIT
The unit should preferably be lifted by its mounting holes and
never by the condensate pan, the plenums or the collars. (42NI
or 42NU model) It is possible to carry out the installation using
a fork-lift truck, as long as care is taken not to damage the unit.
4 - MECHANICAL CONNECTION
To protect against injury or damage to the unit or
room, the hydraulic connections must be made by
qualified personnel only.
Horizontal model:
The unit is installed in the ceiling.
The unit must be suspended from the ceiling using 4 threaded
rods either 6 mm or 8 mm in diameter (not supplied), which are
fixed to the unit’s 4 support brackets using anti-vibration resilient
mounts (optional, Fig. 5, a) or a nut/washer assembly positioned
on either side of the mounting bracket (Fig. 5, b).
For a 42ND or 42NI or 42NU model, ensure that the
suspended ceiling panels can be easily removed and
that there is enough space to carry out maintenance and
servicing operations.
For the 42NU model, the supply plenum must also be secured
to the ceiling using a 6 mm or 8 mm threaded rod (not supplied),
to be attached to the support bracket using a resilient mount
(accessory, fig. 5, a) or a nut/washer assembly placed either side
of the support bracket (fig. 5, b).
Note : CARRIER strongly recommends the use of antivibration
resilient mounts when securing the bracket, in order to reduce
the transmission of vibrations through the building structure
during operation.
Vertical model:
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Fixed to the wall by 4 screws
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Placed on the ground with support feet or air recovery unit
(model with air recovery underneath)
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Placed directly on the ground (42NR model with air recovery
on the front)
Warning:
● All units must be perfectly level.
● Check that there is a sufficient gap between the back of the
unit and the wall (horizontal model, assembly without air
recovery unit) or the floor (vertical model, assembly without
feet) (min. 100mm) (fig. 6) if the air recovery is not ducted.
● If a room thermostat control is provided, place it on an inside
wall (not behind a door) at a height of 150 cm from the floor.
Keep it away from sunlight and all sources of heat.
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