Caution For The Control Of The Unit; Conformity; Installation Of The Unit; Installing The Unit In The False Ceiling - Carrier 42NL Manuel D'installation

• Units must be provided with over-voltage protection
upstream (not supplied by Carrier).
• The power disconnection device must be clearly
labelled to identify which items of equipment are
connected to it.
• The wiring of the components which make up the
different control systems and the communication
buses must be carried out in accordance with the latest
rules and regulations by professional installers.
• The power supply cable must be doubly insulated and
fixed using a cable clamp. A hole is provided for this
purpose in the plastic Carrier controller housing. The
cable must be clamped on the outer insulation.
• The control loop components must be installed in an
environment, which conforms to their index of
protection (IP).
• The maximum level of pollution is normally pollutant
(level 2) and installation category II.
• The low-voltage wiring (communication bus) must be
kept physically separate from the power wiring.
• In order to avoid interference with the communication
links:
- Keep low-voltage wiring away from power cables
and avoid using the same cable run (a maximum
of 300 mm in common with the 230 V a.c., 30 A
cable).
- Do not pass low-voltage wires through loops in
the power cables.
- Do not connect heavy inductive loads to the same
electrical supply (circuit breaker) used by the
controllers, power modules or speed controllers.
- Use the screened cable type recommended by
Carrier and make sure all cables are connected to
the controllers and power modules.

2.4 - Caution for the control of the unit

IMPORTANT: It is not permitted to connect several units
to the same control device (electronic NTC controller, WTC
controller, or any other third party controller). Carrier
electronic Thermostat type A&B for AC motors require
additional accessory board to allow master/slave function.
Carrier electronic Thermostat type C&D for EC motors
can be connected upto 10 units, refer to thermostat
installation manual instructions.

2.5 - Conformity

This equipment is in compliance with the essential
requirements of the following European directives:
• Electromagnetic compatibility: 2004/108/EC,
• Low-voltage directive: 2006/95/EC.
• Restriction of Hazardous substances directive:
2011/65/EC
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3 - INSTALLATION OF THE UNIT

3.1 - Installing the unit in the false ceiling

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 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.

3.2 - Installation procedure

NOTE: The fan-coil units are delivered upside down when
stacked on a pallet.
• Position the unit close to where it is to be installed in
the ceiling void. For installation in a false ceiling use
a hydraulic lift and a folding ladder to make the task
easier (Fig. 7).
• 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.
'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 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 (leave a space between
the ceiling 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 (Figs. 8 and 9).
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 (Figs. 8
and 9).
Condensate drain pipe (Fig. 10): 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 odours from flowing back into the ceiling
void.
WARNING: After drain pipe connection, control clamping
of the drain pipe and be sure there is no water leakage.