Carrier 42EP, Installation, Operation And Maintenance Instructions

Page: 14 / 76

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 service 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 Fig. 5
- Caution hand hazard Fig. 6
- General danger Fig. 7
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.
2.2 - Protection against electrocution
Only personnel qualified to perform electrical and
maintenance work may make electrical connections. 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. The installation must be equipped
with a device to protect against earth faults. The
disconnect device must simultaneously disconnect
the two poles (phase and neutral), and have a
distance of at least 3 mm between the contacts, in
compliance with the installation instructions. The
mains power cable must have 3 conductors (blue,
brown, green/yellow) and its cross section and type
must comply with the specifications set out by the
applicable EN or IEC standard. Refer to the selection
sheet or the name plate to determine the maximum
input current. These devices are not supplied by
Carrier.
■ In general terms, the following rules must be applied:
Upstream over current protection
Standard units without electrical heater and controllers
Fuse rating recommendation
Unit size Fuse type Fuse rating [A]
0
gG 4 1
2
Standard units with electrical heaters and no controllers
Fuse rating recommendation
Unit size
Electrical
Heater size [W]
Fuse type
Fuse rating
[A]
0
500
gG
4
800
1
500
800
1000
6
2
500
800
1000
1600
8
- Electrical connections must be made according to
the wiring diagram provided with the unit and the
installation and operation manual of the controller.
- Units must be provided with over-current protection
upstream (not supplied by Carrier).
- Daisy chain is forbidden (supply others units from
the terminal block of one of them, cf Fig. 8).
- The power disconnection device must be clearly
labelled to identify which items of equipment are
connected to it.
14