91
Start-up - initial settings and functions
T4_IBH_ON
T4DHWMIN
Pompa di Calore
+ Resistenza
solo Resistenza
T
EXT
(T4)
Fig. 90
L
NOTE
– To make the additional source work only as a replacement for the unit, set the parameter to the same
value as T4HMIN (the minimum outdoor temperature at which the heat pump can operate).
– supply temperature too far from the setpoint: parameter dT1_IBH_ON or dt1_AHS_ON: the minimum
∆T between water setpoint TS1 and unit supply T1.
– too long to reach the setpoint: parameter t_IBH_DELAY or t_AHS_DELAY: the maximum waiting time
between compressor start-up and additional source start-up.
Fig. 91
L
NOTE
The BACKUP HEATER function allows start-up of the additional source to be forced from the HMI. See par-
agraph “8.2 Initial unit setting (requires a specialised Technician)” on page 78
7.1 dT1_IBH_ON (standard: 5 - settable: 2/10)
Defines the range between the water supply temperature (T1) and the setpoint (T1S) beyond which the heat-
er is switched on. When T1 ≤ T1S - dT1S_IBH_O the heater is switched on.
7.2 t_TBH_DELAY (standard: 30 - settable: 15/120)
Defines the minimum minutes between compressor start-up and heater start-up.
7.3 T4_IBH_ON (standard: -5 - settable: -15/30)
Defines the outdoor temperature below which the heater can be used. If the outdoor temperature is higher
than T4_IBH_ON, the heater cannot be used.
Heat Pump only
Heat Pump
+ Heater
Heater only
stand-by
Heat Pump
only
Hp + source stand-by
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