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7. HYDRO UNIT INSTALLATION MANUAL
Engineering Data Book
10MAINTENANCE
Execute periodic maintenance at least once a year.
Check points
• Check all electrical connections and make adjustments if they are necessary.
• Check the water pipes of the heating systems in particular any evidence of leakage.
• Check the expansion tank inner pressure. If it is insufficient, enclose nitrogen or dry air in the tank.
• Check that the hydraulic pressure is 0.1 MPa (1 bar) or more with a water manometer. If it is insufficient, replenish
tap water.
• Pull the lever of the pressure relief valve and check operation.
• Clean the strainer.
• Check the pump for an abnormal sound or other abnormalities.
11SENSOR TEMPERATURE MONITORING
FUNCTION
Sensor Temperature Monitoring Function
The sensor sensing temperature is displayed on the remote controller.
This function allows you to make sure whether the sensor is installed properly.
Press the TEST + CL buttons for four seconds or more.
Select the function code with the TEMP. buttons.
Press the TEST button to exit the test mode.
Function code Location Indication
06
Hydro unit
Return water temperature °C
08 Hot water temperature °C
09 2-zone sensor temperature °C
0A Hot water cylinder temperature sensor °C
0B Motorized mixing valve position
60
Outdoor unit
Heat exchanger temperature °C
61 Outside air temperature °C
62 Refrigerant discharge temperature °C
63 Refrigerant intake temperature °C
6A Current value (in the inverter) A
70 Compressor operating frequency
F4
Operating hours
Hydro unit AC pump total operating hours x100 hours
F5 Hot water cylinder heater total operating hours x100 hours
F6 Hydro unit heater total operating hours x100 hours
39-EN
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