Commissioning; Before Operation; Preliminary Check; Checking The Unit - Hitachi YUTAKI RWM-2R1E Installation & Operation Manual

COMMISSIONING

14 COMMISSIONING

14.1 BEFORE OPERATION

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C A U T I O N
• 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.

14.2 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.
Indoor and outdoor units must be configured by the installer to get the perfect setting and the unit working.
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N O T E
For the commissioning of the outdoor unit please refer to the outdoor unit installation and operation manual.

14.2.1 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 (see
the outdoor unit Installation and operation manual).
• Check that the unit has been correctly installed onto the wall.

14.2.2 Electrical checking

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C A U T I O N
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.
• Do not touch any electrical components for more than three minutes after turning OFF the main switch.
• Check the dip switch settings of the indoor unit and the outdoor unit are connected as shown in the corresponding chapter.
• Check to ensure the electrical wiring of the indoor unit and the outdoor unit are 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.

14.2.3 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 electrical heater is completely filled with water by operating pressure of safety valve.
• Check to see that additional water pumps (WP2 or/and WP3) are correctly connected to terminal board.
344 PMML0575 rev.2 - 03/2022
Service space chapter in the Indoor unit Instruction manual and