18
ENG
“SmartCella 3PH” +0500119IE - rel. 1.3 - 21.11.2019
1.12 Connections for pump down operation
managed by Smartcella
1.12.1 Connections for pump down by pressure with
compressor shutdown due to low pressure
If pump down is controlled based on pressure, using a pressure switch,
with compressor shutdown due to low pressure, the connections are as
shown in the following diagram
liquid valve
low pressure
switch
pump down
pressure switch
Fig. 1.q
In this confi guration, when there is no cooling request (Sv<St) the
solenoid valve relay (terminals 105-104) opens, while the compressor
(KM2) remains on until the pressure switch measures low pressure
(terminals 101-102)
Fig. 1.r
Note: as the pressure switch is connected to terminals 101-102, do
not enable pump down on Smartcella 3PH (check that c7=0, H1≠5).
1.12.2 Connections for pump down by pressure with
simultaneous compressor and solenoid valve
activation
If pump down is controlled based on pressure, with simultaneous
compressor and solenoid valve activation, the connections are as shown
in the following diagram
liquid valve
low pressure
switch
pump down
pressure switch
Fig. 1.s
In this confi guration, when there is no cooling request (Sv<St) the
solenoid valve (terminals 105-104) and the compressor (KM2) are
deactivated simultaneously. In normal operation, when the pressure
switch measures low pressure, the compressor is also shutdown
Fig. 1.t
Note: do not enable pump down on Smartcella 3PH (check that
c7=0, H1≠5).
To Next Page
Loading...
Need help?
General
