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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 ADDR228=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.
The non-use of the heat pump for a long period of time entails that the following operations must be carried out:
• Press the icon Stand by
• Disconnect all power supplies of the internal unit through the main switches.
• Disconnect all power supplies of the external unit through the main switches.
To restart the air-water heat pump after a long period of inactivity of the heat pump, it is advised to rely
on the Technical Assistance Service.
8 - MAINTENANCE AND CLEANING
8.1 - CLEANING
Before proceeding with any maintenance and cleaning
intervention, it is essential to disconnect all the power
circuits and/or disconnect all the main switches.
T3
ADDR253
on the display.
on the display.
ADDR254
35
42
SHERPA AQUADUE TOWER
ACS_B
ACS_A
T4
EN - 43
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