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Start-up - initial settings and functions
T
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water supply
T4C1 T4C2
T1S
Fig. 80
8.2.3 Heating mode settings
MENU > FOR SERVICEMAN > 3. HEATING MODE
3.1 HEAT MODE (standard: YES - settable: YES/NO)
Enables/disables Heating mode.
3.2 t_T4_FRESH_H (standard: 0.5 - settable: 0.5/6)
Sets the time when the unit updates the climate curve, adjusting it according to the outdoor air temperature.
3.3 T4HMAX (standard: 25 - settable: 20/35)
Defines the maximum outdoor air temperature for which the unit can operate in Heating mode.
3.4 T4HMIN (standard: -15 - settable: -25/30)
Defines the minimum outdoor air temperature for which the unit can operate in Heating mode.
3.5 dT1SH (standard: 5 - settable: 2/10)
Defines the range between the water supply temperature (T1) and the setpoint (T1S) within which the unit
starts to operate in Heating mode. The heat pump starts when T1 ≤ T1S - dT1SH and stops when T1 ≥ T1S.
Fig. 81
This value is strongly related to the minimum permissible water content of the circuit. A narrower control
band can be accepted with a high water volume.
3.6 dTSH (standard: 2 - settable: 1/10)
Defines the range between the room air temperature (Ta) and the setpoint (TS) within which the unit contin-
ues to operate in Heating mode. The heat pump starts when Ta ≤ TS - dTSH and stops when Ta ≥ TS.
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