Hitachi YUTAKI M RASM-2VRE Instruction Manual page 33

COMMISSIONING
• Check to ensure the external wiring is correctly fixed. To avoid
problems with vibrations, noises and cut out wires with the plates.
11.2.3 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 additional water pumps (WP2 or/and
WP3) are correctly connected to terminal board.
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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 (6 litres/minute
for 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.
11.2.4 Checking the refrigerant circuit
• Check to ensure that the stop valves on the gas and liquid
lines are fully open.
• Check the inside of the unit for refrigerant leakage. If there is
a refrigerant leak, call your dealer.
• Do not touch any of the parts by hand at the discharge gas
side, since the compressor chamber and the pipes at the
discharge side are heated higher than 90°C.
• DO NOT PUSH THE BUTTON OF THE MAGNETIC
SWITCH(ES), it will cause a serious accident.
• Confirm that the leakage of the refrigerant does not exist.
The flare nuts are sometimes loosened by vibration during
transportation
11.2.5 Test and check
Finally, test and check the following items:
• Water leakage
• Refrigerant leakage
• Electrical connection
11.3 COMMISSIONING PROCEDURE
This procedure is valid regardless of what options are on the
module.
• When installation is complete and all necessary settings
(DIP-switches in PCBs and user controller configuration)
have been carried out, close the electrical box and place the
cabinet as shown in the manual.
21 PMML0506 rev.1 - 09/2019
• Make the start-up wizard configuration in the user controller.
• Make a test run as shown in item
• After test run is completed, start the entire unit or the
selected circuit by pressing the OK button.
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Initial start-up at low outdoor ambient
temperatures
During commissioning and when water temperature is very
low, it is important for the water to be heated gradually.
Additional optional function can be used for starting at low water
temperature conditions: Screed drying function:
- The screed function is used exclusively for the process
of drying a newly applied screed to the floor heating
system. The process is based on EN-1264 par 4.
- When user activates screed function, the water set point
follows a predetermined schedule:
1 Water set point is kept constant at 25ºC for 3 days
2 Water set-point is set to the maximum Heating supply
temperature (but always limited to ≤ 55ºC) for 4 days.
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C A U T I O N
• Heating at lower water temperatures (approximately 10ºC to 15ºC)
and lower outdoor ambient temperatures (<10ºC) can be damaging
to the heat pump when defrosting.
• As a result, Heating up to 15ºC when outdoor temperature is lower
than 10ºC is performed by the electrical heater.
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N O T E
In case of Heater Forced OFF (by optional DIP switch setting) these
condition is not performed and heating is performed by Heat Pump.
HITACHI is not responsible for its operation.
!
C A U T I O N
It is recommended start the unit (first power ON) with heater forced OFF
and compressor forced OFF (See
switches"). In order to circulate water by water pump and remove possible
air into the heater (Check heater completely filled).
11.4 TEST RUN / AIR PURGE
Test run is a working mode used when commissioning the
installation. Some settings are made to let the installer an easy
job. Air purge function drives the pump in a way for evacuating
air bubbles in the installation.
A menu with specific function for commissioning appears by
pressing the menu+back buttons for 3 seconds at the installer
menu (OK+back buttons).
"11.4 Test run / air purge".
"10.5 Setting of DIP switches and RSW
OK