Hydraulic Circuit Checking (Space Heating And Dhw); Checking The Refrigerant Circuit - Hitachi YUTAKI M R32 Series Installation & Operation Manual

• 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.
• 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 termi-
nal 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 deal-
er.
• Do not touch any of the parts by hand at the discharge gas side, since the compressor cham-
ber 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 loos-
ened by vibration during transportation
PMML0600 rev.0 - 06/2022
switches".
chapter for more information about requirements and
"6.2 Setting of
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