Hitachi YUTAKI S80 Serie Manuel D'instructions page 30

CONTROL DEVICE SETTING
8 CONTROL DEVICE SETTING
Thermostat (manual reset)
Cut-Out contactors
Current
Voltage
9 COMMISSIONING
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.
?
N O T E
Please, refer to YUTAKI S80 Indoor unit Installation and operation manual for the complete information of the commissioning.
9.1 PRELIMINARY CHECK
9.1.1 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 there is respected the service space
recommended (see "3.2 Service space" in this document
for the tank and the
Outdoor and indoor unit Installation and
operation manuals).
• Check that the unit has been correctly installed and that the
mounting foot are correctly adjusted.
9.1.2 Electrical checking
!
C A U T I O N
Do not operate the system until all the check points have been cleared:
• DO NOT CONNECT THE POWER SUPPLY TO THE INDOOR UNIT
AND DHW TANK PRIOR TO FILLING BOTH CIRCUITS WITH
WATER AND CHECKING WATER PRESSURE AND THE TOTAL
ABSENCE OF ANY WATER LEAKAGE.
• Do not touch any electrical components before than three minutes
after turning OFF the main switch
• Check to ensure the electrical wiring of the DHW tank and the indoor
unit are connected as shown in the corresponding chapter.
• Check to ensure the external wiring is correctly fixed to avoid problems
with vibrations, noises and cut out wires with the plates.
22 PMML0344B rev.2 - 01/2021
Units DHW tank
28~80 ±5ºC
ºC
Safety: 90 ±7ºC
A 16 (AC1)
V 250V
Heating resistances
Power input
Voltage
Diameter
Resistances whole fixing flare nut
Material
Sensor
9.1.3 Hydraulic circuit checking
• Check that the circuit and the tank have been properly
flushed and filled with water and that the installation has
been drained: the pressure of the heating coil circuit must be
1.8 bar (at least 1.5 bar).
• The pressure of the DHW circuit in the tank has to be lower
than 7 bars.
• Check that the water tank heating coil is completely filled.
• 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.
• Make sure the DHW tank internal water volume is correct.
• Check that the hydraulic circuit's valves are fully open.
!
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 heating coil
hydraulic circuit is air purged. The installer is responsible of completely
air purging the installation.
• Check that the water pump of the space heating and heating coil
circuits work within the pump operating range and that the water flow
is over the pump's minimum. If the water flow is under 12 liters/minute
(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.
Units DHW tank
kW 2.7
V 230V
mm 8
"G 1 3/4 (brass)
- Incoloy 800
- NTC 20k at 25ºC