11
6.5.2
Refrigerant diagram of the model HP_OWER 500N
LP
LS
Pr
HP
DT
FL
FL
M
SE
OUT
IN
4WV
EEV
NRV
NRV
LR
LR
ST
PV
PV
CP
LR
P
V
NRV
NRV
NRV *
V *
NRV *
C
C
NRV
C
INVERTER COMPRESSOR
ST
COMPRESSOR INLET TEMPERATURE
DT
COMPRESSOR OUTLET TEMPERATURE
HP
HIGH PRESSURE TRANSDUCER
Pr
HIGH PRESSURE FLOW SWITCH
LP
LOW PRESSURE TRANSDUCER
LS
LIQUID SEPARATOR
4WV
CYCLE REVERSING VALVE
LR
LIQUID RECEIVER
EEV
ELECTRONIC EXPANSION VALVE
FL
FILTER
M
AXIAL FAN
SE
OUTDOOR AIR TEMPERATURE SENSOR
P
CIRCULATOR ON BOARD UNIT
IN
WATER INLET TEMPERATURE
OUT
WATER OUTLET TEMPERATURE
CP
CAPILLARY
V
ON-OFF SOLENOID VALVE
NRV
NO RETURN VALVE
PV
PRESSURE CHECK VALVE
6.6
ELECTRICAL CONNECTIONS
Check if the power supply circuit meets the unit’s electric nominal data (tension, phases, frequency) reported on the label
attached on the right-side panel of the unit. The wiring must be done in accordance to the wiring diagram attached to the unit and
in conformity with the national and international norms in force (attempting to provide a general magneto-thermic 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 0).
Because of the presence, inside the machine, of EMC filters for compliance with EMC limits (interference emission and
interference immunity), earth fault currents up to 250 mA of intensity can be detected.
For proper installation, electrically connect the unit with a dedicated line; if you use a residual current circuit breaker,
choose a four-pole one, with a trigger threshold of 300 mA and delayed triggering (super-resistant, characteristic K).
The machine must be installed in TN-S/TT power supply grounding systems.
The electrical installation must be carried out in accordance with norms in force.
WARNING: The supply voltage’s fluctuations cannot exceed ±5% of the nominal value. Should this tolerance not be
respected, please contact our technical department.
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 water flow switch (B component in the previous hydraulic circuit and factory installed) has ALWAYS to
be connected following the indications listed in the wiring diagram. Never bridge the water flow switch connections in
the terminal board. The guarantee will not be valid if the water flow switch connections are altered or not correctly
performed.
Install upstream of each unit an adequate protection and disconnection device of the electric power with delayed
characteristic curve, with at least 3 mm contact opening and with an adequate capacity of breaking and differential
protection.
A good grounding is required; the manufacturer is not responsible for damage caused in case of lack of good
grounding.
Use cables that meet the regulations in force in different countries.
If the lightning risk is high, the unit must be protected, the risk assessment must comply with the CEI EN 62305-2
regulation.
If there is a possibility that a lightning can strike the area around the appliance, stop the operation of the unit and
disconnect the system upstream switch.
Make sure to ground the unit.
Do not ground the unit with pipes or lightning rods.
A poor grounding of the unit can result in electrocution.
Warning: Electrostatic discharges can damage the electronic components, before performing any work; ground the
electrostatic charge by touching objects such as water or heating pipes.
Before working on the control panel it is OBLIGATORY to:
•
Turn off the units from control panel (displayed “OFF”).
•
Place the general differential QF switch in “OFF” state.
