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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 install, commission and service this equipment.
During servicing work, it is essential to apply all recommenda-
tions 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
UV-C light: do not look directly at this light
without protective glasses.
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 dis-
connect all electrical power supplies to the unit and its acces-
sories 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 controllers must have an isolating device
upstream (for example a double-pole circuit breaker). If
neces-sary, 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 over-voltage protection
upstream (not supplied by Carrier)
Upstream over-voltage
protection
Unit without electric heater
T2A
Standard unit size 1.0/2.1/3.1 with electric heater
T10A
Standard unit size 2.2/2.3/3.2/3.3 with electric heater T16A
•
Units must be protected by a differential type earth leakage
current device (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 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 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.
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