4.1 Outdoor unit
4.1.1 General information
C A U T I O N
•
Before any work to the electrical wiring or regular inspections, switch off the mains power supply of the indoor
and outdoor units. Wait three minutes before starting installation or maintenance work.
•
Make sure that the interior and exterior fans have come to a complete standstill before starting work on the
electrical wiring or regular inspections.
•
Protect cables, the drainage pipe, electrical components, etc. from rodents and insects; otherwise these might
damage unprotected components and this could result in fire.
•
Do not allow cables to come into contact with the refrigerant pipes, metal edges, printed circuit boards (PCB)
or the electric components inside the unit; the cables may be damaged and this could result in fire.
•
Firmly secure the cables inside the indoor unit with plastic flanges.
•
Before starting work on the installation of the outdoor unit, place the DSW7 in the correct position according
to the expected supply voltage:
Setting of the DSW switches on PCB1
, see on page 78.
D A N G E R
•
Use an earth leakage breaker with medium sensitivity, and an activation speed of 0.1 or less. If this is not fitted,
there is a risk of electric shock and/or fire.
•
Install an earth leakage breaker, fuse and circuit breaker for each outdoor unit power line. Not fitting it may
cause an electric shock or fire.
4.1.2 General verifications
1
Make sure the electric components supplied by the fitter (main power switches, circuit breakers, wires, connectors and
connection terminals) have been selected correctly in line with the electrical data given.
a
The electricity supply to the unit should be via an exclusive power control switch and protective circuit breaker,
certified and installed in accordance with local or national safety regulations.
b
The electricity supply for the outdoor and indoor units should be separate. Connect the voltage supply wiring for
each group of indoor units to the same outdoor unit (maximum capacity for each group of indoor units: 26 HP).
c
For heat recovery systems, the CH unit and the indoor unit of the same refrigerant cycle can be supplied from the
same mains power switch.
2
Check that the supply voltage is between 90 and 110% of the rated voltage. Where the voltage capacity is too low, it
will not be possible to start the system due to the drop in voltage.
3
Sometimes, the refrigeration/heating system is not able to operate correctly in the following cases:
•
When the system is supplied from the same supply line as other major consumers (heavy machinery, power inverter
systems, cranes, welding machinery, etc).
•
When the supply cables of the major consumers and the refrigeration/heating system are very close together.
In these cases, induction in the wiring to the refrigeration/heating system may arise due to a rapid change in the electricity
consumption of the above consumers and their start-up. Therefore before starting installation work, check the
regulations and standards concerning adequate protection of the power supply line.
N O T E
For further information, please refer to the applicable legislation in the country in which the unit is to be fitted.
4 Electrical wiring
72
SMGB0065 rev. 1 - 12/2010
