Protection Systems; Water Flow Switch; Refrigerant Gas High And Low Pressure Protection; Overheating Protection On The Compressor - Midas Mida.Black 8 Installation Instructions Manual

3. Protection systems

3.1 Water flow switch

Equipped with flow switch the heat pump will not work when the filter pump is not working (and the
water is not circulating).
This system prevents the heat pump from heating only the water present in the heat pump itself.
The protection also stops the heat pump if water circulation is cut off or stopped.

3.2 Refrigerant gas high and low pressure protection

The high pressure protection makes sure the heat pump is not damaged in case of over pressurisation of
the gas. The low pressure protection emits a signal when refrigerant is escaping from the conduits and the
unit can not be kept running.

3.3 Overheating protection on the compressor

This protection protects the compressor from overheating.

3.4 Automatic defrost control

When the air is very humid and cold, ice can form on the evaporator. In that event, a thin layer of ice app-
ears that will grow increasingly bigger as long as the heat pump is running. When the temperature of the
evaporator has become too low, automatic defrost control will be activated, which will reverse the heat
pump cycle so that hot refrigerant gas is sent through the evaporator during a brief period of time to
defrost it.

3.5 Temperature difference between inflowing and outflowing water

During normal operation of the heat pump, the temperature difference between inflowing and outflowing
℃.
water will approximate 1 to 2
stops circulating, the temperature probe monitoring the outflowing water will always detect a rise in
temperature. As soon as the temperature difference between inflowing and outflowing water exceeds 13℃,
the heat pump will be automatically turned off

3.6 Low temperature cut-out

If, during cooling, the temperature of the outflowing water reaches 5
the heat pump will turn itself off until the water temperature reaches or exceeds 7

3.7 Anti-frost protection during winter

This protection can only be activated if the heat pump is in STAND-BY status.

3.8 First anti-frost protection

If the filter pump is controlled by the heat pump (regardless of the value for parameter 9) and when the
water temperature lies between 2 and 4
be automatically turned on to prevent the water from freezing in the piping. This protection is deactivated
when the temperature rises again.

3.9 Second anti-frost protection

If the water temperature drops even more, that is, below 2
will also start running to heat the water until its temperature approximates 3
is reached, the heat pump will stop, but anti frost protection will remain active until conditions change.
In the event that the pressure switch does not work and that the water
.
℃,
and the air temperature is lower than 0
℃
-
14
℃
or drops below this temperature,
℃
again.
℃,
the filter pump will
(during long frost periods), the heat pump
℃.
When this temperature