ENGLISH
! CAUTION
• 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 ow is over the pump’s minimum.
If the water ow is under 12 litres/minute for 4.0-10.0HP (6 litres/minute for 2.0/2.5/3.0HP unit) (with ow 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 lled with water will damage the heater.
14.2.4 Checking the refrigerant circuit
• Check to ensure that the stop valves on the gas and liquid lines are fully open.
• Check that the size of the piping and the refrigerant charge comply with the applicable recommendations.
• Check the inside of the unit for refrigerant leakage. If there is a refrigerant leak, call your dealer.
• Check outdoor unit commissioning procedure manual.
14.3 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 conguration) have been
carried out, close the electrical box and place the cabinet as shown in the manual.
• Make the start-up wizard conguration in the user controller.
• Make a test run as shown in item “14.4 Test run / air purge”.
• After test run is completed, start the entire unit or the selected circuit by pressing the OK button.
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 oor 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.
! CAUTION
• 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.
? NOTE
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.
! CAUTION
It is recommended start the unit (rst power ON) with heater forced OFF and compressor forced OFF (See “6.7.2.3 Additional hydraulic optional
elements (For DHW)”). In order to circulate water by water pump and remove possible air into the heater (Check heater completely lled).
COMMISSIONING
PMML0575 rev.2 - 03/2022
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