Comissioning - Hitachi YUTAKI S COMBI Series Instruction Manual

COMISSIONING

4 Pass the electrical wiring from the TB1 and TB2 to the lateral
holes of the electrical box. Then, fix the cables to the cord
bands located at the right side. Afterwards, route the cables
through the back side of the user controller plate, and fix
the them with the two clamps located at the top right side.
Finally, take the cables out through the electrical wiring holes
of the top rear side of the indoor unit.
6.3.6 Levelling procedure
Once the indoor unit connections have finished, adjust the
height of the mounting foot to align perfectly the refrigerant
piping outlet to the installation connection.
?
N O T E
• All the procedure must be done before filling the water tank.
• Adjust only the necessary mounting foot of the unit.
• Start with all four feet screwed in as far as possible (factory supplied
position).
• Two people are necessary for the levelling procedure.
Follow the process:
Turn the mounting foot to extend the height (use the hexagon or
slot designed for this purpose in the shaft end).
!
C A U T I O N
• Take care do not turn the weld nut when turning the mounting foot.
Use an slot with a height profile lower than 5 mm.
• Never work on more than one foot at the same time. When finishing,
all 4 lock-nuts must be tightened firmly.
Hexagon and slot
for help in the
foot adjustment
process
Threaded shaft
Weld nut
Foot
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 Comissioning" 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 and DHW circuits with water and checking water
pressure and the total absence of any water leakage.
23 PMML0573 rev.1 - 07/2021

Adjust the
foot's height as
needed
(2 options)
Extend
Take in
"4.2.1 Refrigerant charge", "4.4.7 Water
7 COMISSIONING
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 shutdown. 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 shutdown 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 "3.2 Service space"
operation manual).
• Check that the unit has been correctly installed and that the
mounting feet are correctly adjusted.
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.
and the outdoor unit Installation and