20
7.6.5
Refrigerant circuit of
HPE
LT 25 model
EEV
ELECTRONIC EXPANSION VALVE
NRV
NO RETURN VALVE
ST
COMPRESSOR INLET TEMPERATURE
LP
LOW PRESSURE TRANSDUCER
DT
COMPRESSOR OUTLET TEMPERATURE
HP
HIGH PRESSURE TRANSDUCER
Pr
HIGH PRESSURE FLOW SWITCH
IN
WATER INLET TEMPERATURE
OUT
WATER OUTLET TEMPERATURE
LR
LIQUID RECEIVER
LS
LIQUID SEPARATOR
FL
FILTER
4WV
CYCLE REVERSING VALVE
C
INVERTER COMPRESSOR
P
CIRCULATOR ON BOARD UNIT
M
AXIAL FAN
PV
PRESSURE CHECK VALVE
V
ON/OFF VALVE WITH SOLENOID
VBP
SUPERCOOLING BYPASS VALVE
CP
CAPILLARY
INJT
INJECTION TEMPERATURE
INJP
INJECTION PRESSURE TRANSDUCER
INJ
INJECTION VALVE
7.6.6
Refrigerant diagram of “
HPE
-LT 35” and “
HPE
-LT 50” models
EEV
ELECTRONIC EXPANSION VALVE
NRV
NO RETURN VALVE
ST
COMPRESSOR INLET TEMPERATURE
LP
LOW PRESSURE TRANSDUCER
DT
COMPRESSOR OUTLET TEMPERATURE
HP
HIGH PRESSURE TRANSDUCER
Pr
HIGH PRESSURE FLOW SWITCH
IN
WATER INLET TEMPERATURE
OUT
WATER OUTLET TEMPERATURE
LR
LIQUID RECEIVER
LS
LIQUID SEPARATOR
FL
FILTER
4WV
CYCLE REVERSING VALVE
C
INVERTER COMPRESSOR
P
CIRCULATOR ON BOARD UNIT
M
AXIAL FAN
PV
PRESSURE CHECK VALVE
V
ON/OFF VALVE WITH SOLENOID
VBP
SUPERCOOLING BYPASS VALVE
CP
CAPILLARY
INJT
INJECTION TEMPERATURE
INJP
INJECTION PRESSURE TRANSDUCER
INJ
INJECTION VALVE
7.7
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.
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.
