42VMC---N
GB - 11
E N G L I S H
Jumper positioning:
Units are equipped with a jumper inside the electric control box, to
make them suitable for the two installation typologies:
Wall vertical installation: jumper inserted.
Ceiling horizontal installation: jumper removed.
To reset incorrect jumper positioning, proceed as follows:
• Disconnect the power supply.
• Reposition the jumper correctly.
• Connect the power supply.
IMPORTANT:
• Make refrigerant connections before electrical
connections.
When disconnecting, disconnect electrical connections before
refrigerant connections.
• Models 42VMC 009N, 012N, 014N: make ground connection prior
to any other electrical connections.
Electrical connections
Connection of the system to the mains power supply is to be
carried out in compliance with the wiring diagram shown in the
installation instructions of the external section.
• Make electrical connections between units prior to proceeding to
mains supply unit connection.
• Before proceeding with the unit connection to the mains supply
locate live L and neutral N, then make connections as shown in
the wiring diagram.
• Ensure that mains supply connection is made through a switch
that disconnects all poles, with contact gap of a least 3 mm.
• The mains supply connecting cable must be H07 RN-F type (or
higher), with synthetic rubber insulation with Neoprene coating,
according to EN 60335-2-40 code.
• Ground connection between indoor and outdoor unit is made via
the refrigerant pipes.
• With the cable clamp supplied, secure the connecting cable
between the two units.
• Fasten the electric connecting wires with refrigerant tubes
together.
Allow an additional length to the electric wires for easy
connection to the unit connectors.
Notes:
• For sizing of power supply wires and delay type fuses, refer
to the outdoor unit installation instructions.
• All field electrical connections are the responsibility of the
installer.
IMPORTANT:
The units are provided with electronic control.
A time-delay device provides a 3 minute starting delay of the
compressor every time the unit is stopped or when it is initially
switched on.
Electric heaters connection
• If the indoor unit is provided with an electric heater, it must be
powered separate from the unit.
• Make sure that connection to the mains power supply is made
through a single-pole switch with contact gap of at least 3 mm.
• Make sure that yellow/green cable stripping is longer than the
others.
• Fasten the electric heater supply cable under the single cable
holder.
Control and safety devices
The following control and safety devices are built into the
indoor units (see wiring diagrams):
• Room air thermostat adjustable from 18°C to 32°C.
• Motor with overheat/overcurrent protection.
