Unical HP_OWER 250N, Руководство пользователя и инсталлятора

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10
6.4.4 Plant drainage system
In the case when it is necessary to unload the plant, close at first the inlet and outlet manual gate valves (not supplied) and then
remove the pipes that are disposed externally on the water inlet and on the water outlet in order to spill away the liquid contained
in the unit (in order to make easy the operation, it is recommended to install externally two draining valves, on the water inlet and
on the water outlet, between the unit and the manual gate valves).
6.5 REFRIGERANT DIAGRAMS
6.5.1 Refrigerant diagram of the model HP_OWER 250N – 350N
LP
LS
ST
Pr
HP
DT
M
SE
EEV NRV
NRV
4WV
C
P
OUT
IN
FL FL
LR LR
PV
PV
CP
V 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
V ON/OFF VALVE WITH SOLENOID
CP CAPILLARY
NRV NO RETURN VALVE
PV PRESSURE CHECK VALVE
1
During the operations of filling/replenishment, the plugs of the air vent
valves must be partially unscrewed to allow air to flow freely out of the
valves.
Refer to the Paragraph 20.
(1) Plug of the air vent valve
You can use the service valve, when it is necessary to refill the plant or
adapt the concentration of glycol. Unscrew the plug (cap) of the service
valve and connect to the hose a pipe of 14 mm (inner diameter)
connected to the water network, and then fill the system by
unscrewing the knurled nut. When the operation is concluded,
retighten the knurled nut and screw on the plug. In any case, we
recommend you to use for the water loading of the plant an external
tap whose arrangement is by the installer.
Cap with gasket
Knurled nut