20
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Commissioning
Installer and user reference guide
130
R R8T7V1B
VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
INFORMATION
During the first running period of the unit, the required power may be higher than
stated on the nameplate of the unit. This phenomenon is caused by the compressor,
that needs a continuous run time of 50 hours before reaching smooth operation and
stable power consumption.
NOTICE
Be sure to turn ON the power 6 hours before operation in order to have power
running to the crankcase heater and to protect the compressor.
During test operation, the compressor unit, the heat exchanger unit and the indoor
units will start up. Make sure that the preparations of the heat exchanger unit and
all the indoor units are finished (field piping, electrical wiring, air purge, ...). See
installation manual of the indoor units for details.
20.3 Checklist before commissioning
After the installation of the unit, first check the items listed below. Once all checks
are fulfilled, the unit must be closed. Power-up the unit after it is closed.
You read the complete installation and operation instructions, as described in the
installer
and user reference guide
.
Installation
Check that the unit is properly installed, to avoid abnormal noises and vibrations when
starting up the unit.
Field wiring
Be sure that the field wiring has been carried out according to the instructions described in
the chapter Connecting the electrical wiring, according to the wiring diagrams and
according to the applicable legislation.
Power supply voltage
Check the power supply voltage on the local supply panel. The voltage MUST correspond to
the voltage on the nameplate of the unit.
Earth wiring
Be sure that the earth wires have been connected properly and that the earth terminals are
tightened.
Insulation test of the main power circuit
Using a megatester for 500 V, check that the insulation resistance of 2 MΩ or more is
attained by applying a voltage of 500 V DC between power terminals and earth. NEVER use
the megatester for the transmission wiring.
Fuses, circuit breakers, or protection devices
Check that the fuses, circuit breakers, or the locally installed protection devices are of the
size and type specified in the chapter
100]. Be sure that
neither a fuse nor a protection device has been bypassed.
Internal wiring
Visually check the electrical component box and the inside of the unit for loose connections
or damaged electrical components.
Pipe size and pipe insulation
Be sure that correct pipe sizes are installed and that the insulation work is properly
executed.
Stop valves
Be sure that the stop valves are open on both liquid and gas side.
