UNICA
Sanitary water heat pump
19
Installation diagram in case of solar water circulation
Note: solar heat exchange coil is present only in UNICA S1 and UNICA S2 units
9.6.5
Connection of an auxiliary heat source
Only for UNICA S2 units, it’s possible to connect a third energy source (for example an external boiler). In this case the installer
must disconnect the electric heater and its thermo cut-out (see the WIRING diagram on Paragraph 19.2) and use the power supply
of the heater to give a consent through an external relay (not provided) to the external heat source or to directly supply an
external dedicated pump. The max available output for OUT2 is 20 A resistive. Alternatively, the installer can foresee an external
selector (electrically connected between the electric heater and the PCB) in order to choose if using the E-heater or the third
energy source (see Paragraph 19.3).
Installation diagram in case of auxiliary heat source
Note: auxiliary heat exchange coil is present only in UNICA S2 units
