UNICA
Sanitary water heat pump
18
9.6.3
Water emptying
If the unit needs cleaning, moving etc, the tank should be emptied.
1)
Close the cold water inlet
2)
Open the hot water outlet and open the manual valve of drainpipe
3)
Start the water emptying.
4)
After emptying, close the manual valve.
9.6.4
Installation of an external re-circulation pump and flow switch
If necessary to re-circulate solar water or hot sanitary water, an external pump and flow switch must be connected and installed
hydraulically and electrically. The max available output for the pump is 5 A resistive. Also the optional probe T6 must be connected
to the electrical box and correctly positioned on the hydraulic plant (see the diagrams here below). The Parameter no. 14 must be
configured by the installer (1= hot sanitary water circulation, 2= solar water circulation).
The circulation of hot sanitary water is useful to avoid water becomes cold in the sanitary circuit if not used for several time. In this
way the hot water will be always ready when requested.
The circulation of solar water is possible only if solar panel are installed and only for UNICA S1 or UNICA S2 units. In this way solar
energy is used as secondary heat source to save energy.
In case of solar water circulation, on the circulation loop is required:
an expansion tank suitably sized to absorbe volume variations, installed before the solar system
a pressure safety valve (3 bar) installed after the solar system
an air vent valve with manual gate installed near the safety valve
The discharge of the pressure safety valve must be directed to a specific tank for the collection of glicolated water, and not to the
normal waste water.
In case of solar water circulation, on the hot water outlet is highly recommended a thermal discharge safety valve (85°C) with its
probe positioned into a ½”temperature well installed in the circulation connection.
The UNICA 300 series is provided with an auxiliary well for the installation of any external temperature probe for managing the
solar integration with a separated control. In this case, it is recommended to pass the temperature probe through the hole for
auxiliary cables (see Paragraph 8.3) and through the conduit arranged to the back of the frontal plastic cover, which is in
connection with the auxiliary well. In this way the cable, entering from the rear of the unit, will not be in view thus preserving the
aesthetics of the machine. To remove the frontal plastic cover, simply unscrew the two bottom fixing screws and remove the
cover from the top cover. To remove the top cover, unscrew the three screws that secure the cover to the tank (one on the rear
and two on the sides).
Installation diagram in case of hot sanitary water circulation
