Checking The Refrigerant Circuit; Commissioning Procedure - Hitachi YUTAKI S80 R410A Series Installation And Operation Manual

• 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
(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.
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
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.
8.3

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.
PMEN0648 rev.0 - 03/2023
"8.4 Test run / air purge".
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