5.
Description of the control functions
5.1
Calorifier mode
Heating up of the calorifier is carried out by the heat pump,
electric heating element and boiler, jointly or individually,
depending on the settings. The function of the calorifier
mode is controlled via the user program:
Heat pump: operating mode H. water. Temperature control:
via sensor value (Tmax=setpoint and Tmin). The heat
pump is switched on if the temperature falls below the set
target and switched off when the target is reached. If the
heat pump is switched off, the HW target temperature is
achieved using the selected additional heating (hysteresis:
HP +1/-3 K; additional h/-1 K).
The heat pump is switched off automatically when the
temperature falls below the evaporation temperature
of -18 °C. The operating status is displayed on the
control panel.
(See page 5: display 3)
5.2
Defrost mode
Defrost mode (hot gas bypass) activates automatically
when required. Defrosting using the defrost valve is
initiated (fan off) when the temperature at the evaporator
is < -2 °C.
Defrosting ends when the temperature at the defrost
sensor reaches a value of +5 °C. If this value is not
reached within 20 minutes, defrosting is stopped and
normal operation resumes. The defrost interval lasts
2 hours.
5.3
Protection against Legionella
If, as a general rule, little water is required (extended
dwell time of the water in the calorifier), activation of the
protection against Legionella function is recommended.
When the function is activated (see user program),
the water is periodically heated to 60 °C.
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DeSCrIPTIOn OF The COnTrOL FUnCTIOnS