Safety Considerations - Handling; General; Protection Against Electrocution; General Installation Requirements - Carrier NTC 36CB Installation Instructions Manual

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1 - SAfETY CONSIDERATIONS - HANDlINg

1.1 - General

Installation, start-up and servicing of this equipment can
be hazardous if certain factors particular to the installation
are not considered: presence of electrical components and
voltages and the installation site.
Only properly qualified installation engineers and highly
qualified installers and technicians, fully trained for the
product, are authorised to install and start-up this equipment
safely.
During all servicing operations all instructions and recom-
mendations which appear in the service instructions, on
labels or in instructions that are supplied with any of the
equipment, as well as any other applicable safety instructions
must be followed.
• Apply all standard safety codes and practices.
• Wear safety glasses and gloves.
• Lift and move heavy and large objects carefully and
set them down gently.

1.2 - Protection against electrocution

Only personnel qualified in accordance with IEC (Inter-
national Electrotechnical Commission) recommendations
may be permitted access to electrical components. It is
particularly recommended that all sources of electricity to
the unit be shut off before any work is begun. Shut off the
main power supply at the main circuit breaker or isolator.
IMPORTANT: The components of the NTC control system
include electronic elements. Therefore they can generate
electromagnetic disturbance or suffer disturbance, if they
are not installed and used in accordance with these
instructions.
IMPORTANT: This material has been complies with the
essential requirements of the following directives:
• Electromagnetic compatibility: 89/336/EEC (EN6100)
• Low-voltage directives: 73/23/EEC
• CE Marking: 93/68/EEC
• directive on liability for defective products: 85/374/
EEC
• directive on general product safety: 2001/95/EC
• directive on the Restriction of the use of Certain
Hazardous Substances in Electrical and Electronic
Equipment (RoHS): 2002/95/EC

1.3 - General installation requirements

IMPORTANT: The controller must have an isolation device
installed upstream (example: dual-pole circuit breaker).
If required, an accessible emergency stop device (e.g. punch
type disconnect switch) must allow de-energising of all
units. The isolation devices must be sized and installed in
accordance with recommendation IEC 60364. They are
not supplied by Carrier.
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In general the following points must be observed:
• The isolation device must be clearly marked to show
the equipment that is connected to it.
• The wiring of the components that are part of the
NTC control system as well as the communication
busses must comply with the standard regulations of
professional installers.
• The components of the NTC control system must be
installed in an environment that complies with their
IP protection index.
• The maximum pollution level is normal pollution
(level 2) and the installation category is II.
In order to prevent interference with the connection
cables (see chapter "Wiring/installation diagrams" - list is
not exhaustive):
• Physically separate the low-voltage cables (CCN
communication bus, room temperature sensor, user
interface etc.) from the power wiring. Do not use the
same cable routing (maximum 300 mm common with
the 230 V a.c., 30 A cable).
• Do not route low-voltage cables in the power wiring
loops.
• Do not connect large inductive loads to the power
source (disconnect switch) that supplies the controllers.
• Use the shielded cable type specified by Carrier and
maintain the cables connected to the controllers.

2 - TRANSpORT - STORAgE

The following instructions must be observed during
transport or storage:
The Carrier controller must be kept in a temperature
range from -20°C to +50°C and in a relative humidity
range between 10% and 90%.

3 - DESCRIpTION

3.1 - General description

The NTC is a communicating air conditioning controller,
mounted on Carrier chilled beams. It allows control of the
room temperature and the lighting. It is factory-configured
and tested and can be connected to four user interface
types (ZUI2, SUI, CRC2, IR2). The communication
protocol used is CCN (Carrier Comfort Network).
The NTC control system permits control of two or four-
pipe chilled beams with or without electric heater in a
Carrier system. The NTC has the advantage of virtually
including two NTC sub-controllers, each with a CCN
address.
Each NTC sub-controller is independent, while certain
inputs and outputs of an NTC sub-controller can be
assigned to one or the other NTC sub-controller via the
software.
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