46
ENGLISH
The power lines must be suitably sized to prevent voltage drops or overheating of cables or other devices on the lines.
The power line of the external unit must be capable of being sectioned from the mains using a thermomagnetic circuit breaker
suitable for the machine input with differential relay, with maximum calibration equal to that stated in national electrical regulations
(see table in g. 26).
The internal unit line is already protected by a thermomagnetic circuit breaker on the electrical heater elements power supply
and by a fuse (see sect. 2.1.2); installation of a differential relay on the power line is recommended.
CKecN tKat during tKe compressor operation tKe electrical poZer voltage corresponds to tKe nominal value +/-10%.
Using tKe refrigerant or Zater pipes to eartK tKe appliance is forbidden.
The manufacturer is not liable for any damage arising from failure to earth or failure to comply with that indicated in the wiring
diagrams.
The table in g. 26 shows the maximum inputs of the units.
A External unit power supply
B External unit maximum absorbed power
C External unit maximum absorbed current
D Fuse or thermomagnetic circuit breaker (MFA)
E Internal unit power supply
F Internal unit maximum absorbed power (with electrical heater elements activated)
G Internal unit maximum absorbed current (with electrical heater elements activated)
2.9.1 Access to electrical connections
The terminal boards for the external unit’s electrical connections are located on the right-hand side of the unit. To gain access,
remove the electric panel cover after having removed the fastening screws.
To access the terminal boards for the internal unit’s electrical connections, see sect. 2.1.1 and 2.1.2.
These operations are permitted solely to specialist personnel.
2.9.2 Connecting cables
The following table summarises the cables to be used.
ODU/IDU communication cable A 2 x 0,5 mm
2
shielded
DHW and outside air probe cable B H03RN-F 2 G 0,5 / H03VV-F 2 G 0,5
INTERNAL UNIT SHERPA SMALL SHERPA BIG
Power cable C H05VV 3 x 2,5 mm
2
H05VV-F 3 x 4 mm
2
EXTERNAL UNIT OS-
CEBSH24EI
OS-
CEBCH36EI
OS-
CEBCH48EI
OS-CEB-
TH48EI
OS-
CEBCH60EI
OS-CEB-
TH60EI
Power cable D H07RN-F 3 G2,5 H07RN-F 3 G4 H07RN-F 3 G4 H07RN-F 5 G2,5 H07RN-F 3 G4 H07RN-F 5 G2,5
2.9.3 Electrical connections (g. 23, 24, 25)
Connect the cables listed in the section below to the terminal boards of the internal and external units, referring to g. 23, 24, 25
and the descriptions below.
Internal unit:
• terminals L-N-
internal unit power supply
• terminals 24-25: outdoor temperature detection probe inlet (required for activating the climate curves, enabling the electrical
heater elements inside the unit or activating an external heat source)
• terminals 26-27: domestic water tank temperature detection probe inlet (required for checking temperature of the domestic
water tank and managing anti-legionella cycles)
• terminals Q-P: communication cable between internal unit and external unit
• terminals N-L-12: 3-way valve for domestic water diversion installed as standard on 3W on-board machine version, can be
installed externally on the basic version (kit available)
• terminals N-13: contactor activation for electrical heater element power supply in domestic water tank during anti-legionella
cycles (220-240V 50Hz 100W max)
• terminals 14-15: activation of external heat source e.g.: gas boiler (contact 8A (3A) 250Vac)
• terminals 16-17: alarm contact (contact 8A (3A) 250Vac)
• terminals 5-L: domestic hot water request (when the domestic hot water tank temperature is set by a dedicated external
control; a closed contact between these terminals activates the domestic hot water request).
• terminal 1 electronic board on / off remote free contact
2
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