Hitachi YUTAKI M Bedienungsanleitung Seite 65

7.1 Before operation
!
CAUTION
• Supply electrical power to the system for approximately 12 hours before start-up after a long
shut-off. Do not start the system immediately after power supply, it may cause compressor
failure because the compressor is not well-heated.
• When the system is started after a shut-off longer than approximately 3 months, it is
recommended that the system be checked by your service contractor.
• Turn OFF the main switch when the system is to be stopped for a long period of time: as the oil
heater is always energized even when the compressor is not working, there will be electricity
consumption unless the main switch is turned OFF.
7.2 Preliminary check
When installation is complete, perform commissioning according to the following procedure, and
hand over the system to the customer. Perform the commissioning of the units methodically, and
check that the electrical wiring and the piping are correctly connected.
YUTAKI M units must be configured by the installer to get the perfect setting and the unit working.
7.2.1 Checking the unit
• Check external appearance of the unit to look for any damage due to transportation or
installation.
• Check that all the covers are totally closed.
• Check that the recommended service space is respected.
• Check that the unit has been correctly installed.
7.2.2 Electrical checking
!
CAUTION
Do not operate the system until all the check points have been cleared:
• Check to ensure that the electrical resistance is more than 1 MΩ, by measuring the resistance
between ground and electrical parts terminal. If not, do not operate the system until the
electrical leakage is found and repaired. Do not impress the voltage on the terminals for
transmission and sensors .
• Check to ensure that the switch on the main power source has been ON for more than 12 hours,
in order to give the oil heater time to warm the compressor.
• In three-phase unit check phase sequence connection on terminal board.
• Check the power supply voltage (±10% of the rated voltage).
• Check that field-supplied electrical components (main switches, breakers, wires, conduit
connectors and wire terminals) have been properly selected according to the electrical
specifications given in this document, and check that the components comply with national and
local standards.
PMEN0647 rev.0 - 11/2023
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