Carrier 42EP, Installation, Operation And Maintenance Instructions

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3 - INSTALLATION OF THE UNIT
3.1 - Preliminary checks
For all procedures, switch off the unit power supply
at the isolator provided for the purpose during
installation (isolator not supplied by Carrier).
CAUTION: After disconnecting power supply, keep
the unit idle for 15-20min to cool heating circuit
temperature
- 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 or
lift the unit carefully according to unit type (floor
or ceiling).
3.2 - Installing the unit in the false ceiling
/ False floor
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/floor must be sufficiently even
to allow a simple installation without danger from the
unit. The supporting structure must be able to carry the
unit weight 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.
3.3 - Installation procedure
NOTE: The fan-coil units are delivered upside down
when stacked on a pallet.
- Place the unit close to where it will be installed.
For installation in a false floor/ceiling use a
hydraulic lift and a folding ladder to make the task
easier (Fig. 9).
- 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
floor/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/floor
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.
‘Without filter’ unit must be connected to an air
ductwork. It is not allowed to operate the unit without
any filter and with a free inlet at the same time.
Lift/place 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 or on the floor
(leave a space between the ceiling/floor 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 according images section (Fig.10)
.
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.10).
Condensate drain pipe (Fig. 11): 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 odors
from flowing back into the ceiling/floor void.
WARNING: After drain pipe connection, control
clamping of the drain pipe and be sure there is no
water leakage.
If several units are connected to a common collector, a
device must be installed (Fig. 13). 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 condensation 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.
Once installation is complete - i.e. when the unit is
attached to the ceiling/floor, 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 pipe (1/2” gas screw connector).
WARNING: Be sure that the coil protective caps are
removed before connecting the water pipes (see
Fig.19).
NOTE: Each fan-coil units shall be connected with
water flexible pipes in order to avoid any damage
due to vibrations.
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 purge screws. The
installation can then be started
NOTE: Do not switch on the power until all
connections are made and earthed.
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