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This protection is linked to the autoreset function.
Flow monitoring – monitoring of critical ow
If during the operation of the circulating pump the ow value drops below l/h (xed value) or below the min. ow
according to Figure Minimum water ow for individual power types in the Installation Manual, ch. Hydraulic Circuit, a ow
error is triggered and the circulating pump automatic venting program is started.
Venting is performed in cycles, where in each cycle the circulating pump rst idles for seconds and then works at full
power for seconds. These cycles are repeated continuously until the required minimum ow value is achieved.
Flow monitoring – ow change during defrosting and cooling
When the outdoor unit is defrosting, the power of the circulating pump is automatically increased to %. If the heat
pump is switched to cooling, the circulating pump is not controlled proportionally, but continuously running at full %
power.
Water pressure monitoring – heating/cooling water pressure
The loss of pressure in the heating system is a serious problem, so when the pressure in the heating system drops below
the set value, the entire system stops.
The critical pressure value can be set in the service settings under Minimum water pressure .
This protection is linked to the autoreset function.
Sensor monitoring – critical sensors
The operation of the heat pump requires two temperature sensors. The output water temperature sensor and the return
water temperature sensor. If the values indicated by the sensor fall outside the range (- °C to + °C), the heat pump
stops.
This protection is linked to the autoreset function.
Sensor monitoring – other sensors
A fault of other non-critical sensors is only signalled. It does not affect the primary operation of the heat pump. It affects
only the relevant section to which the temperature sensor belongs. For example, if the DHW sensor shows a fault, DHW
heating will be interrupted.
Outdoor unit failure
A fault of the outdoor unit is only signalled. It does not affect the primary operation of the heat pump. If the outdoor unit
supplies insufcient or no power, the system automatically uses the integrated bivalent source and signals a fault of the
outdoor unit.
Compressor heating
After switching on the heat pump or restoring its power after an outage, only the bivalent source is used for a certain
time. During this time, the outdoor unit is in compressor box heating mode.
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