Electrical Connections - Carrier 42N_S Installation And Operation Manual

Electrical connections

Install the unit according to the national standards on plants.
Connect the power supply L (LINE), N (NEUTRAL) and
terminal 16 as shown in the wiring diagram. Respect the poles shown on
the bottom of the electric panel. See figures 27-28-28b.
All units are equipped with a fuse that protects the controls. If this fuse
needs to be replaced, refer to unit wiring diagram.
Fuses on power supply line, as show on wiring diagram, are specifyed on
Tab. II and III. These fuses shall be supplied by installer.
IMPORTANT:
electrical components.
Remove the control box panel casing by means of the fixing screw/s.
According to the installation instructions, the disconnecting switches
from the mains power supply should have a contact gap (4 mm)
such that total disconnection can be ensured under the conditions
provided for by overvoltage class III.
All fan coil connecting cables as well as accessory wires must be
of the H05 VV-F, type with PVC insulation according to the EN
60335-2-40 standard.
For the unit power supply, it is recommended to use cables with a
2
minimum size of 3G1.5 mm .
Controls (type A – B)
Upon request, the fan-coils of the 42N series can be equipped with one
of the two types of controls available.
The controls are electronic with microprocessor regulation (A and B).
The two control models can be mounted either onboard the machine or
on the wall.
Each control regulates a single fan coil (alternatively with a relay
board it is possible to regulate several units with a single control see
accessories).
Control functions
ON/OFF
Three fan speeds manually selected
Fan speed automatically selected
Temperature selector
Blue LED – cooling operation
Red LED – heating operation
Yellow LED – automatic seasonal changeover
Yellow LED – energy saving
Manual seasonal changeover button
Centralised seasonal changeover button
Automatic seasonal changeover button
Energy saving button
Return air temperature sensor
Temperature sensor located on the board
Cooling / heating valve (2-pipe)
Heating valve (4-pipe)
Cooling valve (4-pipe)
Electric heater
Frost-protection
External contact
Water minimum temperature sensor
Air sampling (periodic fan starting)
Continuous ventilation
Temperature block
Autotest
For units equipped with electric heater, refer to table III (Electric
heater datasheet) for the sizes of the power supply cables.
(GROUND) to
After making all electrical connections do not forget to close the
control box panel using the special protective cover and to fix it by
means of the screw/s previously removed.
Control box panel:
The control box panel is always positioned opposite the water
connections.
For the units 42N-S there are available tree types of control box panels:
1) Control box panel for standard units (see fig. 27)
2) Control box panel for unit with low power electric heaters (see fig. 28)
3) Control box panel for unit with high power electric heaters (see fig. 28b)
Inside the control box panel there are the terminal blocks for making the
connections as shown in the attached wiring diagrams.
42N-E units (equipped with Low Energy Consumption fan motor)
are driven by the Carrier NTC control. For further details on electrical
connections of the above-mentioned units refer to the additional
manual (NTC control) supplied with the unit.
IMPORTANT:
on the units equipped with high power electric heaters > 2000W
size S30-S45, the electrical heaters supply must be separated from
that of the unit. Inside the control box panel (fig. 28b) there are the
terminal blocks for the electrical connections.
All controls must be opened and installed only by qualified personnel as
they contain electrical and electronic components, connected to 230V
power supply.
WARNING:
Disconnect the power supply before opening the control cover.
All inputs (external contact, seasonal changeover etc.) must be
electrically insulated consistent with 230V requirements.
Type A Type B
42N_S 42N_E 19