Hitachi YUTAKI M Bedienungsanleitung Seite 66

• Do not touch any electrical components for more than three minutes after turning OFF the main
switch.
• Check the DIP switch settings of the unit are connected as shown in the chapter
DIP switches and RSW
• Check to ensure the electrical wiring of the unit is connected as shown in the chapter.
• Check to ensure the external wiring is correctly fixed. To avoid problems with vibrations, noises
and cut out wires with the plates.
7.2.3 Hydraulic circuit checking (space heating and DHW)
• Check that the circuit has been properly flushed and filled with water and that the installation
has been drained: the pressure of the heating circuit must be 1.8 bar.
• Check for any leakage in water cycle. Pay special attention to the water piping connections.
• Make sure the system's internal water volume is correct.
• Check that the hydraulic circuit's valves are fully open.
• Check to see that additional water pumps (WP2 or/and WP3) are correctly connected to
terminal board.
!
CAUTION
• Operating the system with closed valves will damage the unit.
• Check to see that air purge valve is open and that the hydraulic circuit is air purged. The installer
is responsible of completely air purging the installation.
• Remember that water connection must be accordance with local regulations.
• Electrical heater operation when not completely filled with water will damage the heater.
• Refer to "Drain and water piping"
recommendations.
7.2.4 Checking the refrigerant circuit
• Check to ensure that the stop valves on the gas and liquid lines are fully open.
• Check the inside of the unit for refrigerant leakage. If there is a refrigerant leak, call your dealer.
• Do not touch any of the parts by hand at the discharge gas side, since the compressor chamber
and the pipes at the discharge side are heated higher than 90°C.
• DO NOT PUSH THE BUTTON OF THE MAGNETIC SWITCH(ES), it will cause a serious accident.
• Confirm that the leakage of the refrigerant does not exist. The flare nuts are sometimes
loosened by vibration during transportation.
PMEN0647 rev.0 - 11/2023
switches".
chapter for more information about requirements and
"6.4 Setting of
7
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