Hitachi YUTAKI M R32 Series - Checking the Refrigerant Circuit; Hydraulic Circuit Checking (Space Heating and DHW)

99
PMML0600 rev.0 - 06/2022
7
PRELIMINARY CHECK
COMMISSIONING
• Check that eld-supplied electrical components (main switches, breakers, wires, conduit
connectors and wire terminals) have been properly selected according to the electrical
specications 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 aer turning OFF the main
switch
• Check the DIP switch settings of the unit are connected as shown in the chapter “6.2 Setting of
DIP switches and RSW switches”.
• Check to ensure the electrical wiring of the unit is connected as shown in the chapter.
• Check to ensure the external wiring is correctly xed. 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 ushed and lled 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 lled with water will damage the heater.
• Refer to “Drain and water piping” chapter for more information about requirements and
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.
• Conrm that the leakage of the refrigerant does not exist. The are nuts are sometimes loos-
ened by vibration during transportation