Service User information Inform the user on how to operate the installed system. In particular, hand this instruction manual to the users, informing them that is must be kept near the product at all times. Inform potential users that the following actions must be carried out: – Periodically check the system water pressure. – Restore system pressure, by deaerating the system when necessary. – Adjust the setting parameters and the adjustment devices to optimise operation and reduce the system’s operating costs. – Perform regular maintenance, as envisaged in the standards. Anti-freeze function of the indoor unit The primary circulation pump of the indoor unit starts at maximum power when the temperature measured by the “CH Flow” sensor falls below 7°C in heating mode. The primary circulation pump stops when the temperature measured by the “CH Flow” sensor rises above 9°C in heating mode. a The integrated heating elements must never be disconnected electrically from the terminal board. Anti-freeze function of the outdoor unit The primary circulation pump of the outdoor unit starts at the minimum speed when the water delivery temperature (LWT) is below 10°C or the return temperature (EWT) is below 7°C in heating mode. It will instead start if the delivery temperature (LWT) is less than 1°C in cooling mode. The primary circulation pump stops at when the delivery temperature (LWT) is below 10°C or the return temperature (EWT) is above 8°C in heating mode. It will instead stop if the delivery temperature (LWT) is above 4°C in cooling mode. If the LWT sensor malfunctions, the protection logic will be based on the values measured by the outdoor temperature sensor (OAT) of the outdoor unit. The primary circulation pump starts when the external temperature sensor gives a reading below 7°C in heating mode. The primary circulation pump stops after 30 sec or when the external temperature sensor gives a reading above 8°C in heating mode. This check is repeated every 15 minutes. a Once maintenance operations have been completed, mount all previously removed components back on again and secure them adequately. 7.1 Cleaning and inspecting the indoor unit It is necessary to carry out the following checks at least once a year: – Inspection of the hydraulic system for filling and tightness, and replacement of seals, if necessary. – Presence of air bubbles in the water supply distribution network. – Check to verify the operation of the heating safety system (limit thermostat check). – Check the heating circuit pressure. – Inspection of the expansion vessel pressure. a Do NOT replace burnt fuses with fuses of different amperage, as this may damage the circuit or trigger a fire. Only use a soft and dry cloth to clean the unit. If the unit is very dirty, it is possible to use a cloth dampened with lukewarm water. Check that the drainage pipe is laid according to the instructions. If not, water leakages may occur resulting in material damages and the risk of fire and electrocution. 7.2 Cleaning and inspecting the outdoor unit It is necessary to carry out the following at least once a year: – Inspection of the refrigerant gas seal. – Cleaning of the front grille. Only use a soft and dry cloth to clean the unit. If the unit is very dirty, it is possible to use a cloth dampened with lukewarm water. If the evaporator (1) of the outdoor unit is clogged up, remove all leaves and debris, then clean off all dust from inside to outside with compressed air jet or some water. Repeat the same procedure with the front grille (2). 1 2 Fig. 94 74 / EN
Service 7.3 Error list The errors are displayed on the interface in the indoor unit (see paragraph "System interface SENSYS HD"). Indoor unit errors Code Description Resolution 114 Outside temperature not available Temperature control activation based on the external sensor External sensor not connected or damaged. Check the sensor’s connection and replace it, if necessary. 730 Buffer high probe error Buffer filling inhibited. Check the hydraulic diagram. Buffer sensor not connected or damaged. Check the sensor’s connection and replace it, if necessary. 731 Buffer overtemperature Buffer filling inhibited. Check the hydraulic diagram. Buffer sensor not connected or damaged. Check the sensor’s connection and replace it, if necessary. 732 Buffer low probe error Buffer filling inhibited. Check the hydraulic diagram. Buffer sensor not connected or damaged. Check the sensor’s connection and replace it, if necessary. 902 System flow sensor damaged Delivery sensor not connected or defective. Check the sensor’s connection and replace it, if necessary. 923 Heating circuit pressure error Check for any water leakages in the hydraulic circuit Faulty pressure switch Defective cabling of the pressure switch. Check the connection of the pressure switch and replace it, if necessary. 924 Communication error Check the cabling between the TDM board and the Energy Manager 927 AUX inputs correspondence error Verify the configuration of parameters 1.1.3 and 1.1.4 928 Energy supply shutdown configuration error Check the configuration of parameter 1.1.5 933 Flow sensor overtemperature Check the flow in the primary circuit. Delivery sensor not connected or defective. Check the sensor’s connection and replace it, if necessary. 934 DHW tank sensor damaged Tank sensor not connected or defective. Check the sensor’s connection and replace it, if necessary. 935 Tank overtemperature Check whether the 3-way valve is locked in the DHW position. Check the connection of the tank’s sensor and replace it, if necessary. 936 Floor thermostat 1 error Check the flow of the under-floor system. Check the connection of the thermostat on the IN-AUX2 STE terminal of the Energy Manager and/or STT of the TDM. If the thermostat of the under-floor system is not present, apply an electrical jumper to terminal IN-AUX2 STE of the Energy Manager and/or STT of the TDM. 937 No circulation error Check that the main circuit has activated 938 Anode fault Check the connection of the anode Check whether there is any water in the indirect cylinder Check the condition of the anode Check the configuration of parameter 1.2.6 940 Hydraulic scheme not defined Hydraulic diagram not selected through parameter 1.1.0 955 Water flow check error Check the connection of the flow and return temperature sensors 970 Aux. pump configuration mismatch Check the configuration of parameter 1.2.5 2P2 Thermal cleanse not complete Sanitisation temperature not reached in 6 h: Check the drawing of domestic hot water during the thermal sanitisation cycle Check the activation of the heating element 2P3 DHW setpoint not reached in boost Domestic hot water set-point temperature not reached during the boost cycle Check the drawing of domestic hot water during the DHW boost cycle Check the activation of the heating element 2P4 Electr. heater thermos. (manual) Check the activation of the main circulation pump Check the flow with the reading of the flow meter through parameter 13.9.3 Check the condition of the safety thermostat and of the cabling 2P5 Electr. heater thermostat (auto) Check the activation of the main circulation pump Check the flow with the reading of the flow meter through parameter 13.9.3 Check the condition of the safety thermostat and of the cabling 2P7 Precirculation error Check the connection of the flow meter Run an automatic deaeration cycle 1.12.0 2P8 Low pressure warning Check for any water leakages in the hydraulic circuit Faulty pressure switch Defective cabling of the pressure switch. Check the connection of the pressure switch and replace it, if necessary. 2P9 SG ready input config. err. Only one of the parameters 1.1.0 or 1.1.1 is set as an SG Ready input EN / 75
Service User information Inform the user on how to operate the installed system. In particular, hand this instruction manual to the users, informing them that is must be kept near the product at all times. Inform potential users that the following actions must be carried out: – Periodically check the system water pressure. – Restore system pressure, by deaerating the system when necessary. – Adjust the setting parameters and the adjustment devices to optimise operation and reduce the system’s operating costs. – Perform regular maintenance, as envisaged in the standards. Anti-freeze function of the indoor unit The primary circulation pump of the indoor unit starts at maximum power when the temperature measured by the “CH Flow” sensor falls below 7°C in heating mode. The primary circulation pump stops when the temperature measured by the “CH Flow” sensor rises above 9°C in heating mode. a The integrated heating elements must never be disconnected electrically from the terminal board. Anti-freeze function of the outdoor unit The primary circulation pump of the outdoor unit starts at the minimum speed when the water delivery temperature (LWT) is below 10°C or the return temperature (EWT) is below 7°C in heating mode. It will instead start if the delivery temperature (LWT) is less than 1°C in cooling mode. The primary circulation pump stops at when the delivery temperature (LWT) is below 10°C or the return temperature (EWT) is above 8°C in heating mode. It will instead stop if the delivery temperature (LWT) is above 4°C in cooling mode. If the LWT sensor malfunctions, the protection logic will be based on the values measured by the outdoor temperature sensor (OAT) of the outdoor unit. The primary circulation pump starts when the external temperature sensor gives a reading below 7°C in heating mode. The primary circulation pump stops after 30 sec or when the external temperature sensor gives a reading above 8°C in heating mode. This check is repeated every 15 minutes. a Once maintenance operations have been completed, mount all previously removed components back on again and secure them adequately. 7.1 Cleaning and inspecting the indoor unit It is necessary to carry out the following checks at least once a year: – Inspection of the hydraulic system for filling and tightness, and replacement of seals, if necessary. – Presence of air bubbles in the water supply distribution network. – Check to verify the operation of the heating safety system (limit thermostat check). – Check the heating circuit pressure. – Inspection of the expansion vessel pressure. a Do NOT replace burnt fuses with fuses of different amperage, as this may damage the circuit or trigger a fire. Only use a soft and dry cloth to clean the unit. If the unit is very dirty, it is possible to use a cloth dampened with lukewarm water. Check that the drainage pipe is laid according to the instructions. If not, water leakages may occur resulting in material damages and the risk of fire and electrocution. 7.2 Cleaning and inspecting the outdoor unit It is necessary to carry out the following at least once a year: – Inspection of the refrigerant gas seal. – Cleaning of the front grille. Only use a soft and dry cloth to clean the unit. If the unit is very dirty, it is possible to use a cloth dampened with lukewarm water. If the evaporator (1) of the outdoor unit is clogged up, remove all leaves and debris, then clean off all dust from inside to outside with compressed air jet or some water. Repeat the same procedure with the front grille (2). 1 2 Fig. 94 74 / EN
Service 7.3 Error list The errors are displayed on the interface in the indoor unit (see paragraph "System interface SENSYS HD"). Indoor unit errors Code Description Resolution 114 Outside temperature not available Temperature control activation based on the external sensor External sensor not connected or damaged. Check the sensor’s connection and replace it, if necessary. 730 Buffer high probe error Buffer filling inhibited. Check the hydraulic diagram. Buffer sensor not connected or damaged. Check the sensor’s connection and replace it, if necessary. 731 Buffer overtemperature Buffer filling inhibited. Check the hydraulic diagram. Buffer sensor not connected or damaged. Check the sensor’s connection and replace it, if necessary. 732 Buffer low probe error Buffer filling inhibited. Check the hydraulic diagram. Buffer sensor not connected or damaged. Check the sensor’s connection and replace it, if necessary. 902 System flow sensor damaged Delivery sensor not connected or defective. Check the sensor’s connection and replace it, if necessary. 923 Heating circuit pressure error Check for any water leakages in the hydraulic circuit Faulty pressure switch Defective cabling of the pressure switch. Check the connection of the pressure switch and replace it, if necessary. 924 Communication error Check the cabling between the TDM board and the Energy Manager 927 AUX inputs correspondence error Verify the configuration of parameters 1.1.3 and 1.1.4 928 Energy supply shutdown configuration error Check the configuration of parameter 1.1.5 933 Flow sensor overtemperature Check the flow in the primary circuit. Delivery sensor not connected or defective. Check the sensor’s connection and replace it, if necessary. 934 DHW tank sensor damaged Tank sensor not connected or defective. Check the sensor’s connection and replace it, if necessary. 935 Tank overtemperature Check whether the 3-way valve is locked in the DHW position. Check the connection of the tank’s sensor and replace it, if necessary. 936 Floor thermostat 1 error Check the flow of the under-floor system. Check the connection of the thermostat on the IN-AUX2 STE terminal of the Energy Manager and/or STT of the TDM. If the thermostat of the under-floor system is not present, apply an electrical jumper to terminal IN-AUX2 STE of the Energy Manager and/or STT of the TDM. 937 No circulation error Check that the main circuit has activated 938 Anode fault Check the connection of the anode Check whether there is any water in the indirect cylinder Check the condition of the anode Check the configuration of parameter 1.2.6 940 Hydraulic scheme not defined Hydraulic diagram not selected through parameter 1.1.0 955 Water flow check error Check the connection of the flow and return temperature sensors 970 Aux. pump configuration mismatch Check the configuration of parameter 1.2.5 2P2 Thermal cleanse not complete Sanitisation temperature not reached in 6 h: Check the drawing of domestic hot water during the thermal sanitisation cycle Check the activation of the heating element 2P3 DHW setpoint not reached in boost Domestic hot water set-point temperature not reached during the boost cycle Check the drawing of domestic hot water during the DHW boost cycle Check the activation of the heating element 2P4 Electr. heater thermos. (manual) Check the activation of the main circulation pump Check the flow with the reading of the flow meter through parameter 13.9.3 Check the condition of the safety thermostat and of the cabling 2P5 Electr. heater thermostat (auto) Check the activation of the main circulation pump Check the flow with the reading of the flow meter through parameter 13.9.3 Check the condition of the safety thermostat and of the cabling 2P7 Precirculation error Check the connection of the flow meter Run an automatic deaeration cycle 1.12.0 2P8 Low pressure warning Check for any water leakages in the hydraulic circuit Faulty pressure switch Defective cabling of the pressure switch. Check the connection of the pressure switch and replace it, if necessary. 2P9 SG ready input config. err. Only one of the parameters 1.1.0 or 1.1.1 is set as an SG Ready input EN / 75
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