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4�3�4 Domestic hot water logic
A
Compressor frequency
A
max
p. 18
"SSP"
: set domestic hot water temperature
p. 19
"SHY"
: domestic hot water temperature hysteresis (2 °C)
4�4 Auxiliary heater management (heating element or support heat generator)
The system allows the implementation of an auxiliary heating element or a heat generator (Boiler) to support the heat pump.
The auxiliary generators can intervene for producing plant water or domestic hot water with a difference:
• the electrical heating element can operate either in cooperation with the heat pump (HIE: CAL) or switching (HIE: CON)
with heat pump circulation pump
• the boiler can operate only in switching mode (HIE: CAL) using its own circulator
The boiler must be connected to digital output BC1.
The backup boiler cannot work at the same time as the heat pump.
The parameters are already modified if the kit is factory-fitted.
Adjustments and parameter changes must be carried out by the Technical Service Department or a competent person.
4�4�1 Activation logics
The activation logic is the same for the plant water and the domestic hot water.
The production of domestic hot water has priority over plant water heating.
The auxiliary heating element or boiler is activated to support the heat pump in case of the outdoor unit in winter and in the
sanitary area and according to:
• outdoor temperature too low
• setpoint timeout
• water temperature demand higher than the limit that the heat pump can manage
The boiler will shut down in the event of:
• domestic hot water storage temperature too high alarm
• plant water temperature too high
Outdoor temperature too low
The system activates the auxiliary generator when the outside temperature falls below the threshold value.
FUnCTIon SETTInG InDooR UnIT WITHoUT InTEGRA TED WA TER T AnK
INDOOR UNIT WITHOUT INTEGRATED WATER TANK
B
Domestic hot water storage temperature
SSP
SSP - SHY
B
PT4
31
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