23
SLS/SLH 10/06
13
OIL RECOVERY FUNCTION
If one of the compressor (circuit 1-2) running at 50%
more than 40’ the control will force the the compressor
(circuit 1-2) at 100% for 5 minuts.
14
PUMP CONTROL
Parameters used in Pump management mask: Remote
logic, Stand-by, Delay Stop.
Pump always starts 30 seconds before the first compres-
sor is loaded and stops always a parameter Pump
Delay Time value in seconds after the unit is stopped
locally or by remote start/stop digital input.
If the parameter “Pump Remote Logic” is in YES, if the
unit is stopped by the remote Start/Stop digital input,
the pump continues to run. It only stops if the unit is
locally stopped by panel.
When the unit is in Off, always pump runs for 5 mins
every “Pump Stand-by Interval” value, setted in Service
Level. Default must be 12 hours.
If the pump is not controlled by the electronic control put
the stand by value at 00.
If the unit is in stand-by, the pump must anyway be start-
ed if the Antifreeze heater is powered or the unit is in
Antifreeze alarm.
15
PUMP-DOWN LOGIC – LIQUID
LINE SOLENOID VALVE
CONTROL
Pump Down during start-up of the first compressor of
each system and during stop of the last compressor of
each system.
Parameters used: Pump-Down Max Time, Pump-Down
Enable, Liquid Line Solenoid Valve Enable. All the fol-
lowing logic is valid only if Liquid Line Valve are select-
ed as present in Factory Level, and if Pump-Down is
enable in Service Level.
Each system is equipped with one liquid line solenoid
valve, to feature a pumping down.
Pump-down finishes by low pressure, when Low Pressure
Switch opens and/or by maximum time reached. See
the mask and graphs below for further information.
16
DEFROST CYCLE
(HEAT PUMPS ONLY)
Defrosting of a circuit with time/temperature control:
