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7.8. Setting an additional heat source (Other thermal)
After accessing the "Additional heat source" function,
you can activate or deactivate the substitute heat
source and set the outdoor temperature threshold be-
low which it will be activated in place of the heat pump;
you can also define the logic for managing the substitu-
tion. The available logic items are:
Logic 1
With this logic, the 2-way valve is managed on the basis
of the control panel settings; the operating modes will
therefore be managed when the temperature measured by the outside air probe is lower than the "Addi-
tional heat source temp." parameter:
• Heating: the unit (and its circulator) will not be active, the 3-way valve will be blocked on the system
side, and the additional heat source will be activated; once the set value has been reached, the addi-
tional heat source will be deactivated and the unit will activate its circulator.
• DHW: the unit (and its circulator) will not be active, the 3-way valve will be blocked on the DHW side,
and the additional heat source will be activated.
• Heating + DHW: the unit (and its circulator) will not be active, the 3-way valve will be blocked on the
system side, and the additional heat source will be activated; once the set value has been reached,
the additional heat source will be deactivated and the unit will activate its circulator; the DHW side
will be managed using only the electric heaters of the compatible Aermec accessory tank.
Logic 2 (not available for BHP units)
With this logic, the 2-way valve is managed on the basis of the control panel settings; the operating
modes will therefore be managed when the temperature measured by the outside air probe is lower than
the "Additional heat source temp." parameter:
• Heating: the unit (and its circulator) will not be active, the 3-way valve will be blocked on the system
side, and the additional heat source will be activated; once the set value has been reached, the addi-
tional heat source will be deactivated and the unit will activate its circulator.
• DHW: the unit (and its circulator) will not be active, the 3-way valve will be blocked on the DHW side,
and the additional heat source will be activated.
• Heating + DHW:
1. If the priority is "Heating" (paragraph 4.5), the unit (and its circulator) will not be active, the 3-way
valve will be blocked on the system side, and the additional heat source will be activated; once the
set value has been reached, the additional heat source will be deactivated and the unit will activate
its circulator; the DHW side will be managed using only the electric heaters of the compatible Aer-
mec accessory tank.
2. If the priority is "DHW" (paragraph 4.5), the unit (and its circulator) will not be active, the 3-way valve
will be blocked on the DHW side, and the additional heat source will be activated; once the set value
has been reached on the DHW side, the 3-way valve will be moved to the system side and the addi-
tional heat source will work for heating.
Logic 3:
This logic disables the heat pump and activates a 230V signal to the “Other thermal” terminals (refer to the
installation manual for more information); this signal activates the additional heat source when the tem-
perature measured by the outside air probe is lower than the "Additional heat source temp." parameter
(which will work in stand alone mode compared with the unit).
Lastly, press the top right button to save the data entered.
Other thermal
Other thermal: With
T Other switch on: -20°C
Logic: 1
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