Removal Procedure - Carrier 42CE Manual De Instalación

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 by Carrier) 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.
Lift the unit and align it on the threaded hangers, insert
the second nuts and tighten them slightly.
NOTE: At this point do not tighten the nuts fully and do
not clamp the unit up to the ceiling. The nuts will be
adjusted finally, when the unit has been connected to the
pipework and ducts and levelled.
Level the unit (Fig. 11).
Adjust the hanger nuts so that the unit is inclined 0.5%
towards the condensate drain pan. In the other direction
(air flow direction) the unit must be perfectly level (Fig. 12).
Condensate drain pipe: Use a flexible pipe with an inside
diameter of 19 mm and provide a constant fall of 20 mm/m
over the whole horizontal pipe run. Install a 50 mm (mini-
mum) siphon to prevent gases and odours from flowing
back into the ceiling void (Fig. 13).
If several units are connected to a common collector, a
device must be installed, as shown in Fig. 14.
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.
The 42CE unit can be connected to an air distribution grille
or to an air diffuser. In all cases the connection duct(s) at
the unit outlet must be insulated to prevent any condensate
formation on the walls.
• Rectangular duct connected to an air distribution
grille: in this case the duct is directly connected to the
42CE unit.
NOTE: The connection duct will have a different
height for units with and without electric heater (see
dimensional drawings).
• Connection to an air diffuser with oblong spigots with
the same perimeter as the semi-rigid duct (diameter
200 mm).
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.
For the connection of semi-rigid ducts Carrier recommends
the following procedure:
• Remove the oblong spigots from the unit (Torx screw
with a T20 star-shaped head), in order to carry out the
connection to the ducts on the floor.
• Roll up the double skin of the insulated duct over a
length of approximately 100 mm (Fig. 15).
• Shape the end of the semi-rigid insulated duct to
facilitate its attachment to the oblong spigot (Fig. 16).
• Insert the spigot into the duct, ensuring that the duct
is pushed onto the clips that are in several places on
the plain sections of the spigot (Fig. 17).
• Attach the spigot to the duct either with a collar or
with aluminium adhesive (Fig. 18).
• Re-install the spigot and duct assembly on the unit
using the two screws (Fig. 19).
When installation is complete - i.e. when the 42CE is
attached to the ceiling, air ducts are complete, water
manifolds are in position with stop valves ready on the
connection stubs, and electrical installation is prepared -
then connect the water pipes (Carrier recommends the use
of flexible water pipes that can be supplied as an accessory).
Each flexible pipe has a 1/2" gas screw connector, depend-
ing on the model. Ensure that a gasket (not supplied by
Carrier) is installed between the screw connector and the
stop valve.
When all units are installed, open the stop valves on the
manifolds, bleed and then pressurize the circuits. To bleed
the coils, slightly loosen the bleed screws.
NOTE: Do not switch on the power until all connections
are made and earthed.
The installation can then be started.

3.3 - Removal procedure

• Switch off the unit power supply at the isolator
provided for the purpose during installation (isolator
not supplied by Carrier).
• Disconnect the power supply and connection cables.
• Close the isolating valves on the manifolds.
• Disconnect the flexible water pipes by unscrewing the
gas connectors.
WARNING: Since the flexible water pipes do not
have drain valves, a receiver must be provided to
allow the cooling coil to be drained.
• Disconnect the supply air ducts.
• Disconnect the flexible condensate drain pipe. Drain
the siphon into a suitable vessel.
• Support the unit lightly and release it by unscrewing
the four nuts on the threaded hangers. Lower the unit
carefully.