Evco c-pro 3 micro CHIL Series - Page 60

EVCO S.p.A. c-pro 3 micro CHIL | Application manual ver. 1.0 | Codice 144CP3CHE104
page 60 of 120
Anyway, there is always the Compressor switch-OFF delay in pump-down, should the switch-OFF pressure threshold not be reached, or
should evaporation sensors be faulty.
In order to enable this function, the following parameters must be set:
PC41 = 2: Function enable
PC42: Pump-down time
PC43: Pump-down differential
Note: In case of alarm, the system must ignore the compressor shutdown delay.
8.7.5 Protection timings
The purpose of these timings is that of protecting mechanical units from the various start-up stresses to which they are subjected.
PC04 = Compressor minimum ON time. Once it has been activated, a compressor must remain ON for this time interval, before it can
be switched OFF again.
PC05 = Compressor minimum OFF time. This is the minimum time interval that must elapse from the last switching-OFF, before the
compressor can be switched back ON again.
PC06 = Minimum time between switching-ON of the same compressor. It determines the minimum time which must elapse between
two switching-ON of the same compressor.
PC07 = Minimum time between switching-ON of different compressors. It determines the minimum time which must elapse between
the switching-ON of a compressor and that of the next one.
PC08 = Minimum time between switching-OFF of different compressors. It determines the minimum time which must elapse between
the switching-OFF of a compressor and that of the next one.
PC09 = Maximum number of compressor start-ups within one hour. This determines the maximum number of switching-ON within the
time span of one hour: should this limit be reached, the regulator will wait until conditions are present, before switching that
compressor ON again.
Last
compressor
request
Evap. P
Solenoid
valve
Compressor
PC43
Pump-down
pressure
differential
PC42 Pump-down disable delay
t
t
t
t