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5. Operation
5.3 Using the pressure gauge
The gauge is for monitoring the pressure of the refrigerant contained in the heat pump.
The values it indicates can vary considerably, depending on the climate, temperature and atmospheric
pressure.
When the heat pump is in operation:
The gauge’s needle indicates the refrigerant pressure.
Mean operating range between 250 and 400 PSI, depending on the ambient temperature and atmospheric
pressure.
When the heat pump is shut down:
The needle indicates the same value as the ambient temperature (within a few degrees) and the corre-
sponding atmospheric pressure (between 150 and 350 PSI maximum).
If left unused for a long period of time
:
Check the pressure gauge before starting up the heat pump. It must indicate at least 80 PSI.
If the pressure goes down too much, the heat pump will display an error message and automatically go into
‘safe’ mode.
This means that there has been a leakage of refrigerant and that you must call a qualified technician to
replace it.
5.4 Antifreeze protection
When the heat pump is on standby, the system monitors the ambient temperature and the water tempera-
ture in order to activate the antifreeze programme if required.
The antifreeze programme is automatically activated when the ambient temperature or the temperature of
the water is less than 2°C and when the heat pump has been shut down for more than 120 minutes.
When the antifreeze programme is running, the heat pump activates its compressor and the circulating
pump so as to reheat the water until the water temperature exceeds 2°C.
The heat pump automatically leaves the antifreeze mode when the ambient temperature is greater than or
equal to 2°C or when the heat pump is activated by the user.
WARNING: For the antifreeze system to work, the heat pump must be powered and the
circulating pump activated. If the circulating pump is servo-controlled by the heat pump, it will
be automatically activated.
