Commissioning - Hitachi YUTAKI S Series Instruction Manual

Commissioning

6.3.7 Test and check
Finally, test and check the following items:
• Water leakage
• Refrigerant leakage
• Electrical connection
• ...
?
N O T E
Please refer to the chapters of
filling" and "7 Commissioning" in this document and refer the Outdoor unit
Installation and Operation manual for the specific details about refrigerant
charge tasks.
!
D A N G E R
Do not connect the power supply to the indoor unit prior to filling
the space heating circuit (and DHW circuit if it were the case) with
water and checking water pressure and the total absence of any
water leakage.
7 COMMISSIONING
7.1 BEFORE OPERATION
!
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.
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.
Indoor and outdoor units must be configured by the installer to
get the perfect setting and the unit working.
?
N O T E
For the commissioning of the outdoor unit please refer to the outdoor unit
installation and operation manual.
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
(see
"3.1 Service space"
operation manual).
26 PMML0574 rev.0 - 09/2021
"4.2.1 Refrigerant charge", "4.4.6 Water
and the outdoor unit Installation and
• Check that the unit has been correctly installed onto the wall.
7.2.2 Electrical checking
!
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.
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 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.
!
C A U T I O N
• Operating the system with closed valves will damage the unit.
• Check to see that air purge valve is open and that the hydrau lic circuit
is air purged. The installer is responsible of com pletely air purging the
installation.
• Check that the water pump of the space heating circuit works within
the pump operating range and that the water flow is over the pump's
minimum. If the water flow is under 12 litres/minute for 4.0-10.0 HP (6
litres/minute for 2.0/2.5/3.0HP unit) (with flow switch tolerance), alarm
will be displayed on the unit.
• Remember that water connection must be accordance with local
regulations.
• Water quality must comply with EU directive 98/83 EC.
• Electrical heater operation when not completely filled with water will
damage the heater.