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4.2.2 Further functions
Aquarea air / water heat pump – design handbook 07 / 2014
• Pump control: Monitoring of the operating condition upon switching
on the heat pump – only when all the required criteria are positively
checked does the heat pump transform into the normal mode. Should
one criteria not correspond to the expected value, the heat pump
goes into the error state .
• Service mode: Is used for the activation of the circulation pump and
the pump down operation.
• Flow rate cut-out: Monitors the water flow rate and switches the heat
pump off, when the minimum flow rate is not attained.
• Additional electric heater mode: The additional electric heater can
be operated as backup when the heat pump malfunctions. For this
purpose, the additional electric heater must be switched on manually.
• Monitoring the maximum return water temperature:
The return water temperature is checked during the start of operation,
should this temperature exceed 80 °C, the pump will be switched off.
• Defrosting function: By taking into account the outdoor temperature
and supply water temperature as well as their fluctuations, this function
ensures that ice that forms on the air-to-water heat exchanger of the
outdoor unit or Monobloc unit is defrosted.
• Automatic restart: For controlled start after abrupt interruption of the
power supply.
• Sterilisation mode: Weekly thermal sterilization of the hot water tank
by means of the electric immersion heater. Adjustable using the
24-hour timer.
• Whisper-quiet operation: Reduces the compressor operating
frequency as well as the fan speed of the outdoor or Monobloc unit
by 80 rpm to at least 200 rpm, thus reducing the noise level.
• Solar mode: Expands the system by integrating an external solar
thermal control system into the heat pump controller. For the solar
operation, a tank as well as the additional PCB for solar thermal
connection must be available. The solar thermal installation itself
is controlled by an external solar thermal controller (to be provided
by the customer).
• Operation with an external room thermostat: Without an external
room thermostat, the Aquarea heat pump works via an internal
thermostat function that monitors supply water and return water
temperature and compares it with the heating curve. Upon exceeding
the nominal supply water temperature by 2 K the compressor switches
off. The operation with external room thermostat can prevent frequent
switch on-and-off, in that the room temperature is additionally considered
for control of the heat pump.
• Additional housing heating (optional): Can be activated in the
"Base Pan Heater" (applies to F generation units or later)
• Screed-drying function: (applies to F generation units or later)
Closed-loop control
Functions
Further functions
57
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