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6. USE
6.1 Switch the unit on
Unit switch-on and switch-off can take place:
• From the keyboard
• From digital input configured as remote ON/OFF
Before first start-up, consult and carry out the operations described in the paragraph " Periodical checks ".
6.1.1 Switch the unit on from the keyboard
Heating mode
To start the unit in heating mode, press the
If requested, the compressor safety delay countdown starts and the compressor icon flashes. The water pump will be activated after few
seconds and then, once the compressor countdown has finished, the compressor starts and the icon remains on. The display shows the
user water inlet temperature and Domestic hot water inlet temperature.
Domestic hot water mode
At the first start up, the unit microprocessor control checks the domestic hot water inlet temperature measured by the sensor BTS (this
has priority over the other parameters) and, if the measured temperature is lower than the domestic hot water set point , it will activate the
domestic hot water mode automatically. If the unit is required to operate in heating and the domestic hot water temperature is higher than
the set point (there is no requirement for domestic hot water) the microprocessor control will activate the unit in heating mode. If the unit
is required to operate in cooling and domestic hot water mode the microprocessor control will activate both functions at the same time. If
domestic hot water is not required, the microprocessor control will activate cooling mode only.
In stand-by mode, the controller gives the possibility to:
• display the set values
• manage alarms, theyr display and reports.
If it is required to switch the unit on and off, never do this using the main isolator: this should only be used to discon-
nect the unit from the power supply when the unit is to be permanently off. Isolation will result in no supply for the
crankcase heater and on start up the compressor could be seriously damaged.
5.3.1 Selection built in display or remote keyboard
PROBES
key. The icon
SET
ALARM
SERVICE
CIRC
EXIT
appears on the display.
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Rev. A 11-2020
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