EVCO c-pro nano NAV - Manual (Page 29)

C-PRO NANO AND MICRO NAV APPLICATION MANUAL
Page 29
6.8.4 Winter evaporation high temperature alarm
The following figure shows the behaviour on the evaporator in the case of winter functioning (heat
pump). On the basis of the output gas temperature at the AI4 condenser, the alarm is activated over
the set-point and deactivated after a differential below the set-point.
6.9 Pressure alarms
The program can control the refrigerant circuit pressure and signal the occurrence of high and low
pressure alarms.
6.9.1 High pressure alarm
The alarm is diagnosed by the reading of the high pressure switch DI3 when the contact opens
(normally closed).
This alarm has manual reset.
The alarm is always active also with the compressor off.
6.9.2 Low pressure alarm
The alarm is diagnosed by the reading of the low pressure switch DI4 when the contact closes
(normally open).
This alarm is reset automatically for the first 3 (parameter) interventions in the hour, after it
becomes manual.
The alarm is delayed for a period (parameter) from compressor switch-on.
AT4
ON
SET4 SET4 +
at evaporator output
AT3
ON
SET3 SET3 +
Gas temperature
at condenser input