Supply Voltage; Safety Considerations; General; Protection Against Electrocution - Carrier 42NL Manuel D'installation

1.4 - Supply voltage

Check that the supply voltage and frequency correspond to
the values of the unit to be installed.
Operating Limits - Electrical input
Low consumption - Min : 207V
EC brushless Motor Max : 253 V
60 or 50 Hz -1ph
Multispeed - Min : 207V
AC motor Max : 253 V
60 or 50 Hz -1ph
(60Hz not available for 42NH3_5)
NOTE: All performances data certified by Eurovent are
based on 50Hz application. Carrier doesn't ensure the same
performances when the unit operates at 60Hz; the RPM
and power input of the fan-motor are usually higher.
WARNING: Failure to take proper account of the above
advice and unauthorised modification of the electrical
connections will render the Carrier warranty on the product
null and void.

2 - SAFETY CONSIDERATIONS

WARNING: Switch off the main electrical power supply
to the unit and accessories (if installed) before doing any
work on the unit.

2.1 - General

Installing, commissioning and servicing of the various
component (unit, control system, hot and cold water system,
air distribution system) can be dangerous unless certain
aspects of the installation, such as the presence of mains
electricity and hot or cold 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
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 safety rules and regulations currently in
force. Wear eye protectors and work with hand gloves and
any individual protection equipment following local
legislation. Take care when moving or positioning of the
equipment.
- Fig.4
- Fig.5
- Fig.6

2.2 - Protection against electrocution

Only electricians 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 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, commercial
and light industrial areas. They also comply with the
low-voltage directive.
If the product is supplied without a Carrier control device,
verification of EMC conformity is the responsibility of the installer.

2.3 - General installation conditions

IMPORTANT: The Carrier numeric controller, power
module, 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:
Upstream over voltage protection
Size (42NL &
Without Elec. Heater
42NH)
2_5; 2_9 T2A
3_5; 3_9 T2A
4_5; 4_9 T2A
5_5; 5_9 T3A
6_5; 6_9 T3A
7_9; 7_9 T3A
Size (42NL & With Elec.
42NH) Heater
[0-1400W] [1500-2400W] [3000-3200W]
2_5; 2_9 T10A
3_5; 3_9 T10A
4_9 T10A
4_5 T10A
5_5; 5_9 T10A
6_5; 6_9 T10A
7_5; 7_9 T10A
• Electrical connections must be made according to the
wiring diagram provided with the unit and the
installation and operation manual of the controller.
NA NA
NA NA
NA NA
T16A NA
T16A NA
T16A T20A
T16A T20A
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