Installation; Refrigerant Connections - Carrier 40KMC N Series Installation Manual

Installation

See fig. 15.
• Install the unit as centrally as possible in the room, the air flow
direction can be controlled by means of the remote control (where
used) or automatically, according to the operating mode (cooling
or heating): this will ensure optimum distribution of the air in the
room.
• During cooling mode operation the best position for the deflecting
louvres is one which allows air diffusion close to the ceiling
(Coanda effect).
In heating mode, the louvres should be positioned so that the air
is directed towards the floor, in order to prevent layers of hot air
forming in the upper part of the room (this will happen
automatically when the deflecting louvres are positioned in the
"AUTOMATIC" mode). Alternatively the louvres can be placed in
intermediate positions (with infrared control only) or allowed to
move continuously (SWING).
• In order to allow easy and rapid installation and maintenance,
make sure that in the selected position it is possible to remove the
ceiling panels or, if the ceiling is constructed using masonry, that
access to the unit is guaranteed.
ATTENTION:
Only restrict the air outlets as indicated in the drawing.
WARNING:
To close one or two air outlets use the special kit.
Prior to installation
It is advisable to place the unit as close as possible to the
installation site before removing it from the packaging. The grille
panel and the remote control are separately packed for maximum
protection (see fig. 16).
IMPORTANT:
Do not lift the unit by the condensate drain discharge pipe or
by the refrigerant connections; hold it by its four corners
only.
Unit installation will be facilitated using a stacker.
If plaster board ceiling panels are installed the maximum
dimensions of the unit housing must not exceed 660 x 660 mm (for
models 12-18-24) and 900 x 900 mm (for models 28-36-48-60).
In rooms with high humidity, brackets should be insulated using
the self adhesive insulation supplied.
Installation
Mark the position of the hangers, refrigerant lines and condensate
drain pipe, power supply cables and remote control cable (see
dimensions); the cardboard template (supplied with the kit) may be
of assistance for this operation.
Depending on the type of ceiling the hangers can be fixed as
shown in the drawing 17.
Once the threaded hangers have been positioned, do not tighten
the nuts, and insert the washers as shown in the drawing 18.
First position the refrigerant lines, as described in the chapter

"Refrigerant connections".

Remove the "T" bar in order to facilitate installation operations.
(see fig. 19).
Carefully lift the unit (without the frame) using the four
suspension brackets (or the four corners), inserting it into the
false ceiling.
If the "T" bar cannot be removed the unit may need to be tilted
(this operation may only be carried out with false ceilings with a
minimum height of 300 mm). (see fig. 20).
Align and level the unit by adjusting the nuts and locknuts on the
threaded hangers, maintaining a distance of 25 - 30 mm
between the sheet metal body and the underside of the false
ceiling.
Reposition the "T" bar and align the unit in relation to the bar by
tightening the nuts and locknuts.
After connection of the condensate drain line and the refrigerant
lines, carry out a final check to make sure that the unit is level.
(see fig. 21).
Making the hole for connection pipes in the external wall
See fig. 22.
• After positioning the units and determining the connection
position, make a 70 mm Ø hole in the wall. The same hole can be
used as a condensate drain pipe conduit.
• The hole should have a 5 - 10 mm slope toward the outside.
Insert the plastic conduit provided.
• Pass the power connection cables through the conduit (see
electrical connections).
Condensate drain pipe
See fig. 23 - 24 - 25.
• To ensure correct condensate water flow, the drain pipe should
have a gradient of 2% without obstructions.
Furthermore an odour trap of at least 50 mm depth should be
made to prevent unpleasant odours from reaching the room.
• Condensate may be discharged at a maximum height of 200 mm
above the unit, as long as the ascending tube is vertical and
aligned with the drainage flange.
• If it is necessary to discharge the condensate from a level above
200 mm, install an auxiliary water discharge pump and float valve.
A float valve is recommended to stop the compressor if there
is a fault at the auxiliary pump.
• The condensate pipe must be insulated with a condensation-proof
material such as polyurethane, propylene or neoprene of 5 to 10
mm thickness.
• If more than one unit is installed in the room, the drain system can
be made as shown in the drawing.
Installation of grille/frame assembly
See fig. 26 - 27 - 28.
Carefully unpack the assembly and check for damage sustained in
transport. Attach the assembly to the unit by using the two hooks.
Tighten the four screws, link the electrical connectors and insert the
wires in the cable clamp.
Use the screws supplied to fix the frame in position.
Ensure that the frame is not distorted by excessive tightening,
that it is aligned with the false ceiling and above all that there is
a seal between the air inlet and outlet.
In the drawing gasket "A" prevents return air from mixing with
the supply air and gasket "B" prevents the supply air from
leaking into the ceiling void.
On completion, the gap between the unit frame and the false
ceiling must not be more than 5 mm.
40KMC---N 29