1592015820 User manual IC260_261L_D DUO FW1.9 rel. 1.0
Pag. 64 of 149
27. CIRCUIT MANAGEMENT: SATURATION OR BALANCING
CIRCUIT SATURATION
CO15 = 0
If the machine has 2 compressors in the circuit 1 and 2 compressors in the circuit 2, the sequence of
activation is:
1
st
compressor circuit 1
2
nd
compressor circuit 1
1
st
compressor circuit 2
2
nd
compressor circuit 2
CIRCUIT BALANCING
CO15 = 1
If the machine has 2 compressors in the circuit 1 and 2 compressors in the circuit 2, the sequence of
activation is:
1
st
compressor circuit 1
1
st
compressor circuit 2
2
nd
compressor circuit 2
2
nd
compressor circuit 2
28. PUMP DOWN
PUMP DOWN with low pressure switch or pump down pressure switch
CO36 = 1 Pump down enabled during the switching off (low pressure switch or pump down switch)
Before turning off the last compressor, the solenoid valve is closed; the compressor works until the pressure
switch is activated or after a maximum time CO39; in this case an alarm is displayed (b1PH or b2PH) but the
machine continuous to work as normal.
If the alarm occurs more than AL21 times per hour, the Ichill generate a manual alarm.
Low pressure alarm (when the low pressure switch is used) is disabled for AL02 time after valve activation
(AL02=0 the alarm is disabled when the compressor is OFF).
When the first compressor of the circuit is switched on, the solenoid valve is switched on 1 seconds before it.
CO36 = 2 Pump down enabled during the switching off and switching on (low pressure switch or
pump down switch)
Before turning off the last compressor, the solenoid valve is closed; the compressor works until the pressure
switch is activated or after a maximum time CO39; in this case an alarm is displayed (b1PH or b2PH) but the
machine continuous to work as normal.
If the alarm occurs more than AL21 times per hour, the Ichill generate a manual alarm.
Low pressure alarm (when the low pressure switch is used) is disabled for AL02 time after valve activation
(AL02=0 the alarm is disabled when the compressor is OFF).
When the first compressor of the circuit is switched on, the solenoid valve is switched on 1 seconds before it
if the pressure switch is not active.
If the pump down pressure switch remains activeated, the compressors does not restart and after CO39 time
a pump-down alarm is displayed.
The parameter AL23 allows to choose if the pump down alarm (during the switching on) is automatic or
manual reset:
AL23 =0 automatic reset; the compressor will rester when the pump down pressure switch is active
AL23=1 manual reset; if the number of pump down alarm per hour is lower than AL22 the reset is
automatic, manual reset; if the number of pump down alarm per hour is higher than AL22 the reset is
manual
PAR. CO36 = 3 Pump down enabled during the switching off only in chiller mode (low pressure
switch or pump down switch)
The pump douwn procedure works as CO36=1 but only in chiller mode; in heat pump mode the solenoid
valve is activated when the first compressor is ON and de-.activated when the last compressor is OFF.
PAR. CO36 = 4
Pump down enabled during the switching off and switching on inly in chiller
mode (low pressure switch or pump down switch)
The pump douwn procedure works as CO36=2 but only in chiller mode; in heat pump mode the solenoid
valve is activated when the first compressor is ON and de-.activated when the last compressor is OFF.
