Operating instructions

EN-4
English
2.4
2.4 Safety Devices
The hot-water heat pump has the following safety features:
High-pressure switch
The high-pressure switch protects the heat pump against imper-
missibly high operating pressure in the refrigerant circuit. In the
event of fault, the pressure switch will switch off the heat pump.
The heat pump is restarted automatically if there has been a
pressure drop in the refrigerant circuit.
Safety temperature limiter for heating element
(STL)
The STL protects the hot-water installation against impermissible
temperature increases.
It is fixed to the control room panel and the corresponding sensor
is located in the dip pipe of the heating element.
The heating element is switched off if the set switching value
(99 °C) is exceeded.
The heating element cannot be re-started until the hot-water tem-
perature has decreased to  90 °C and the reset button (Fig. 2)
on the STL is pressed.
(This may be done by qualified personnel only!)
3 Regulation and Operation
3.1 Hot-Water Heat Pump Operator Panel
3.2 Hot-Water Temperature
Controller (Rotary Controller)
The rotary button is used to set the desired hot-water tempera-
ture. If the tank temperature is lower than the set hot-water tem-
perature, the heat pump is switched on (if the heat pump switch
is in the “On” position).
The maximum hot-water temperature that can be attained with
the heat pump is 60 °C ±1.5 K. The standard heating element
can be used if higher temperatures are required (see Point 3.4).
Notes on economical use of energy:
 To achieve a high COP with the integrated heat pump while
cutting water level losses, the hot-water heat pump should
normally not be operated at a hot-water temperature of more
than 45 °C (Fig. 4).
 Only set the temperature controller to higher values or
switch the heating element on manually if necessary.
 To ensure optimum compressor operating times or down-
times, do not manually switch the heat pump on and off re-
peatedly too often!
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