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Water and ethylene glycol solutions used as heat carrier fluid in place of water cause a reduction of the unit
performances. Add water with a maximum percentage of 35% of ethylene glycol (equal to a protection up
to -20°C).
3.4 - HYDRAULIC SYSTEM FILLING
Once the hydraulic connections have been completed, it is necessary to proceed with filling of the system.
Simultaneously, it is necessary to vent the air inside the pipes and of the appliance by beans of the air vents
on the circuit and on the appliance. Initially, with the water circuit empty, the machine must not be connected
to the mains power supply. The machine must be powered and the circulation pump started only in the final
filling phases of the hydraulic circuit. It is advised to activate the temporary forcing function of the circulation
pump for 15 minutes. If an external auxiliary pump is used, the latter must also be started only in the final filling
phases of the circuit. The operating pressure of the system must not exceed 1,5 BAR when the pump is off.
In any case, to check for possible leaks of the system during test phase, it is advised to increase the test
pressure (maximum pressure of 3 bar) and then to release it to reach operating pressure.
To fill the system, it is necessary to (fig.7):
a. Open the upper door (S) located in the front part of the unit.
b. Open the filling tap (25) by rotating the knob anticlockwise until you reach operating pressure which
shall be included between 0,5 and 3 bar.
c. Operating pressure will be displayed on the manometer (26).
At the end of filling operations, close the tap (25).
3.5 - CIRCULATION PUMP ALARM
If, during first start-up, error E06 appears on the display of the control panel after the start of the circulator E06:
a. Check that the valves of the system are open.
b. Check that at least one utility with circuit open is present.
c. Check that the external sieve filter is not clogged.
d. Check that there are no air pockets inside the circuit.
e. Check that water pressure of the system is correct.
f. Check that the circulator is not blocked.
To delete the pump alarm and restore operation, press the Reset icon on the display and confirm.
3.6 - ELECTRICAL CONNECTIONS
Before carrying out any intervention, make sure that all the power supplies are dis-
connected.
• These operations are only allowed for specialized personnel.
• Carry out electrical connections respecting the installation manual, the wiring
diagram and the local laws.
• The heat pump has 3 separate power supply circuits. The internal unit has a main
power supply circuit and an auxiliary heaters power supply circuit.
The external unit has a single power supply circuit.
• Envisage separate power supplies, one for each circuit.
• Envisage an appropriate interruption with fuses or magnetothermic switch for
each power supply.
• Envisage a suitable ground for each power supply.
• Envisage a earth leakage breaker for each power supply.
• Use specific cables for power supplies.
• Only use copper cables.
• The cables must be equipped with cap terminals of the proportionate section
• Check that the mains voltage and frequency values respect what is indicated on
the plate data of the heat pump.
EN - 21
SHERPA AQUADUE TOWER
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