Hitachi YUTAKI M Bedienungsanleitung Seite 67

7.2.5 Test and check
Finally, test and check the following items:
• Water leakage
• Refrigerant leakage
• Electrical connection

NOTE
Please refer to the chapters of
!
DANGER
Do not connect the power supply to the indoor unit prior to filling the space heating circuit (and
DHW circuit if it were the case) with water and checking water pressure and the total absence of
any water leakage.
7.3 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.
• 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.
◆ 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 25°C for 3 days.
2 Water set-point is set to the maximum Heating supply temperature (but always limited to
≤ 55°C) for 4 days.
PMEN0647 rev.0 - 11/2023
"5.4.8 Water filling" and
"7.4 Test run / air
"7.3 Commissioning procedure".
purge".
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