Test And Check; Commissioning Procedure - Hitachi YUTAKI M R32 Series Installation & Operation Manual

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 "5.1.5 Water filling" and "7.3 Commissioning procedure" in this doc-
ument and refer the Outdoor unit Installation and Operation manual for the specific details about
refrigerant charge tasks.
!
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 con-
troller 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 but-
ton.
◆ 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 tempera-
ture 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.
PMML0600 rev.0 - 06/2022
"7.4 Test run / air purge".
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