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7 - USE
7.1 - PRODUCTION OF DOMESTIC HOT WATER
With SHERPA AQUADUE, thanks to a water/water integrated in the internal unit heat pump, it is possible to
produce domestic hot water at high temperature (up to 75°C) without the use of electric heaters, in parallel
with the conditioning function and independently from external air temperature.
The production of domestic hot water, up to the maximum temperature of the parameter "maximum ACS_A"
of parameter ADDR248 is entrusted to the main heat pump (external unit which uses the internal unit main
exchanger) by switching the three-way valve in the internal unit.
Once the maximum temperature ACS_A of parameter ADDR248 has been reached, the main heat pump will
continue to work in conditioning mode if required and the water/water integrated in the internal unit heat pump
will produce domestic hot water until reaching the set point of parameter "Domestic hot water temperature".
T
set Point ACS
ADDR248
ADDR255
During the production of domestic hot water with the main heat pump, the system produces as much
power as possible to quickly meet the request for domestic hot water.
The request for domestic water can occur in the follow manners:
• Through DHW/L contact and setting parameter ADDR228=1; in this case, set the external thermostat at
a temperature lower than 70°C.
• Through a temperature sensor inserted in the domestic hot water reservoir setting parameter A DDR228=2;
in this case, the set point is determined by parameter ADDR210.
With parameter ADDR228=0, the production of domestic hot water is disabled.
With parameter ADDR238 it is possible to change the hysteresis cycle of the domestic water temperature check.
The temperature sensor T3 supplied in the internal module must always be inserted in and connected
to the domestic hot water reservoir.
7.2 - ANTIFREEZE PROTECTIONS
The brazed plate exchanger of the main circuit and the evaporator of the heat pump for domestic hot water
production at high temperature in the internal unit are protected against breaking in case of frost by a flow
switch which stops the operation of the system when water flow rate is insufficient and by the temperature
sensors on the exchanger.
7.3 - DEACTIVATION AND SWITCHING OFF FOR LONG PERIODS
To deactivate the heat pump, proceed as follows:
• Press the icon Stand by
• Cut off power to the external unit.
This way, the anti-blocking function of the circulation pump remains active.
T3
ADDR253
on the display.
ADDR254
35
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SHERPA AQUADUE
ACS_B
ACS_A
T4
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EN - 43
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