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3 - SAFETY CONSIDERATIONS
3.1 - General
Installing, commissioning and servicing of the various
components which make up the different control loops can be
dangerous unless certain aspects of the installation, such as the
presence of mains electricity and hot or chilled-water in the air
conditioning equipment, are taken into account.
Only specially trained and qualified technicians and installers
who have been fully trained on the product concerned are
authorised to instal, commission and service this equipment.
During servicing work, it is essential to apply all
recommendations and instructions given in service leaflets, on
labels or in the instructions delivered with the equipment, and
to comply with any other relevant instructions.
Definition of the pictograms used
Electrical Danger
Caution hand hazard
General Danger
Comply with all the safety rules and regulations currently in
force.
Wear eye protectors and work gloves.
Take care when moving or positioning equipment.
3.2 - Precautions against electrocution
Only electricians who are qualified to the level recommended
by the IEC (International Electrotechnical Commission) in its
standard IEC 364, corresponding to Europe HD 384, France
NFC 15 100 and UK IEE Wiring Regulations, may have
access to electrical components. In particular it is obligatory to
disconnect all electrical power supplies to the unit and its
accessories before carrying out any work. Disconnect the main
power supply with an isolating device (not supplied by
Carrier).
IMPORTANT:
The components, which make up the different control loops
described in this manual include electronic items. As such,
they may generate or be harmed by electromagnetic
interference unless they are installed and used in accordance
with these instructions. The components making up these
control systems conform to the requirements of
electromagnetic compatibility in residential and industrial
areas. They also comply with the low-voltage directive.
3.3 - General installation recommendations
IMPORTANT:
The MAESTRO controller, power module, controls loops
with speed controllers or in general units fitted with controls
loops must have an isolating device upstream (for example a
double-pole circuit breaker). If necessary, an easily operated
emergency stop device (such as a punch-button switch) must
cut off the power to all equipment. These safety devices shall
be sized and installed in accordance with IEC
Recommendation 364, corresponding to Europe HD 384,
France NFC 15 100 and UK IEE Wiring Regulations. These
devices are not supplied by Carrier.
In general terms the following rules must be applied:
- Units must be provided with overvoltage protection upstream
(not supplied by Carrier)
Unit without electric heater
Unit with electric heater
- Units must be protected by a differential type earth leakage
current device (not supplied by Carrier)
- The power disconnexion 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 an appropriate cable clamp or the cable clamp supplied
with the MAESTRO controller. 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 VAC, 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.
3.4 - Conformity
This equipment has been declared to be in conformity with the
main requirements of the directive by virtue of using the
following standards:
- Electromagnetic compatibility: 89/336/EEC
- Low-voltage directive: 73/23/EEC
Upstream overvoltage protection
T2A
T16A
11
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