1592026260 IEV22-24D GB r.1.0 21.02.2019 IEV 32/60
Minimum LOP operating pressure alarm
The LOP alarm threshold is expressed as a temperature value and is equal to the pressure of probe 3
and probe 4 converted into a temperature value.
The LOP alarm is triggered when the equivalent temperature of the pressure probe drops below
Et17/Et37 for the Et47 time.
If the LOP alarm is still active, any low and high superheating alarms are reset.
When the alarm is active, the driver opens the valve by Et16/Et36 steps at each second of operation.
The condition to come out from minimum operating pressure are:
• the equivalent temperature of the pressure probe exceeds Et17/Et37 + 4.0°C
• Et17 < Evaporation pressure converted to temperature < Et17+4°C and superheating < Et13
(low superheating set point)
After LOP alarm reset, the driver carries out the aperture of the valve by Et16/Et36 steps at each
second of operation
8. Description of parameters
8.1 Probe configuration parameters
• Ec2 Positioning of the low pressure probe
o If the IEV is configured in STD-ALONE mode, the low pressure probe must be
configured in the IEV
o If the IEV is configured with operation in LAN with the Ichill 200 EVO series, the
low pressure probe can be configured in the IEV or in the Ichill; is strongly
recommend the connection to the IEV as the pressure is calculated with the
resolution in hundredths and is more accurate for the calculations carried out by
the IEV
• Ec27 Configuration of probes Pb1 and Pb2
Used to select the kind of Pb1 and Pb2 probes (NTC, PTC, PT1000)
• Ec28 Configuration of probes Pb3 and Pb4
Used to select the kind of Pb3 and Pb4 probes (NTC, PTC, PT1000 , 4..20mA,
0..5V)
• Ec29 Probe pressure value with suction at 4mA / 0.5V
Used to set the minimum pressure value at 4mA / 0.5V, to be set based on the
features of the transducer employed.
• Ec30 Probe pressure value with suction at 20mA / 4.5V
Used to set the maximum pressure value at 20mA / 4.5V, to be set based on the
features of the transducer employed.
• Ec31...Ec34 Calibration of probes Pb1...Pb4
Used to calibrate probe reading to correct any measuring errors
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