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UNICA
Sanitary water heat pump
9.7 ELECTRICAL CONNECTIONS
Check out that the power supply meets the unit's electric nominal data (tension, phases, frequency) reported on the technical
label of the unit. Power connections have to be made in accordance to the wiring diagram enclosed with the unit and in
conformity with the national and international norms in force (providing equipments as general magnetothermic circuit breaker,
differential circuit breakers for each electric line, proper grounding for the plant, etc.). Power cables, electric protections and line
fuses have to be sized according to the specifications listed in the wiring diagram enclosed with the unit and in the electrical data
contained in the table of technical characteristics (see Paragraph 16).
WARNING: The power supply have to respect the listed limits: failing this, warranty will terminate immediately.
Before any operation on the unit, be sure that the power supply is disconnected.
WARNING: The supply voltage's fluctuations can not exceed ±10% of the nominal value. Should this tolerance not be
respected, please contact our technical department.
WARNING: If external circulation pump is connected to the system, the external water flow switch have ALWAYS to
be connected following the indications listed in the wiring diagram. Never bridge the water flow switch connections in
the terminal board.
Use the specified electrical wires and attach the wires firmly to the terminal board (connection in such a way that the
stress of the wires is not applied to the sections): incorrect connection and fixing could cause a fire.
Perform electrical work according to the installation manual and be sure to use a dedicated section, fused with 16A.
If the capacity of the power circuit is insufficient or there is an incomplete electrical circuit, it could result in a fire or
an electric shock.
The unit must always have an earthed connection. If the power supply is not earthed, you may not connect the unit.
Never use an extension cable to connect the unit to the electric power supply.
If there is no suitable, earthed wall socket available, have one installed by a recognized electrician.
Do not move/repair the unit by yourself.
If the supply cord is damaged, it must be replaced by the manufacturer or its service agent or a similarly qualified
person in order to avoid a hazard. Improper movement or repair on the unit could lead to water leakage, electrical
shock, injury or fire.
The installation height of power supply should be over 1.8m, if any water may spatter, the unit can be safe from
water.
To access the electrical box:
1) remove the plastic cover of the top part
2) remove the metallic cover of the electrical box unscrewing the 4 screws
3) the unit is already provided with a power supply cable connected to the electrical box. If it's necessary to disconnect it and to
connect a longer cable, or if it's necessary to connect an ON/OFF remote signal, or an external flow switch and pump for
circulating sanitary water or solar water, please refer to the wiring diagram.
The specification of the power supply wire is 3*1.5mm². Fuse specification is T 3.15A 250V.
There must be a switch when connecting the unit to the power system. The current of the switch is 10A.
A creepage breaker must be installed near the power supply and the unit must be effectively earthed. The specification of the
creepage breaker is 30mA, less than 0.1sec.
10 START UP
Before start-up:
•
Check out the availability of the supplied wiring diagram and manual of installed apparatus.
•
Check out the availability of the electrical and hydraulic diagram of the plant in which the unit is installed.
•
Check out that all water connections are properly installed and all indications on unit labels are observed.
•
Check the inlet water pressure, make sure that the pressure is sufficient (above 1,5 bar).
•
Check that the shut-off valves of the hydraulic circuit are open.
•
Verify that the hydraulic circuit has been charged under pressure and air vented.
•
Check if any water flows out from the hot water outlet, make sure that the tank is full of water before turning on the power.
•
Ensure that arrangements have been provided to drain the condensate.
•
Check out that all power cables are properly connected and all terminals are hardly fixed.
•
Check that electrical connections are carried out according to the norms in force including grounding.
•
Check out that the voltage is the one shown in the unit technical label.
•
Make sure the voltage is within the limits (± 10%) of tolerance range.
•
Check out that there is no refrigerant leakage.
•
Check out that all the cover panels are installed in the proper position and locked with fastening screws before start up.
•
Check the unit; make sure everything is ok before turning 'ON' the power of the unit, check the light on the wire controller
when the unit runs.
•
Use the wire controller to start the unit.
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