Commissioning; Preliminary Check; Checking The Unit; Electrical Checking - Hitachi YUTAKI S80 Series Installation And Operation Manual

COMMISSIONING

10 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

10.1 PRELIMINARY CHECK

10.1.1 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 Service space in this document for the tank and the
door and indoor unit Installation and operation
• Check that the unit has been correctly installed and that the
mounting foot are correctly adjusted.

10.1.2 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 IN-
DOOR UNIT AND DHW TANK PRIOR TO FILLING BOTH
CIRCUITS WITH WATER AND CHECKING WATER PRES-
SURE AND THE TOTAL ABSENCE OF ANY WATER LEAK-
AGE.
• 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.

10.2 COMMISSIONING PROCEDURE

• When installation is complete and all necessary settings (Dip-
switches in PCBs and User interface configuration) have been
carried out, close the E.BOX and place the cabinet as shown
in the manual.
• Select the heating operation mode in the LCD controller.
49 PMML0291A rev.2 - 09/2014
for the complete information of the commissioning.

10.1.3 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
out-
than 7 bars.
manuals).
• 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.
• Make a test run as shown in item
• After test run is completed, start the entire unit or the selected
circuit by pressing the Run/Stop button.
Indoor unit test run.