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PMEN0645 rev.0 - 04/2023
8
COMMISSIONINGPROCEDURE
COMMISSIONING
8.2.4 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
recommendaons.
• Check the inside of the unit for refrigerant leakage. If there is a refrigerant leak, call your dealer.
• Check outdoor unit commissioning procedure manual.
8.3 Commissioning procedure
This procedure is valid regardless of what opons are on the module.
• When installaon is complete and all necessary sengs (Dip-switches in PCBs and user
controller conguraon) have been carried out, close the electrical box and place the cabinet as
shown in the manual.
• Make the start-up wizard conguraon in the user controller.
• Make a test run as shown in item “8.4 Test run / air purge”.
• Aer test run is completed, start the enre unit or the selected circuit by pressing the OK buon.
◆ Inial 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. Addional oponal funcon can be used for starng at low water temperature
condions: Screed drying funcon:
✓ The screed funcon is used exclusively for the process of drying a newly applied screed to
the oor heang system. The process is based on EN-1264 par 4.
✓ When user acvates screed funcon, 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 Heang supply temperature (but always limited to ≤ 55°C)
for 4 days.
! CAUTION
• Heang at lower water temperatures (approximately 10°C to 15°C) and lower outdoor ambient
temperatures (<10°C) can be damaging to the heat pump when defrosng.
• As a result, Heang up to 15°C when outdoor temperature is lower than 10°C is performed by
the Electrical Heater.
NOTE
In case of Heater Forced OFF (by oponal dip switch seng) these condion is not performed and
heang is performed by Heat Pump. Hitachi is not responsible for its operaon.
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