User manual

1592022700 User manual iCHILL 200CX Rel. 1.0 22/04/2009
If the last compressor stops before the low pressure switch because of the CO33 time-out (maximum compressor on time after turning
off the P.D. solenoid valve), the ICHILL calculates the AL28 parameter (maximum number of pump down alarm per hour) and if an
alarm occurs the display will show the alarm code, the buzzer and the alarm relay will be on.
If the thermoregulation is stopped via digital input (as remote off) or from chiller/heat pump keys, during the pump down process the
chiller or the heat pump led will blink.
When the next thermoregulation restarts the PD solenoid valve turns on and after 1 seconds, if the low pressure switch is not active, the
compressors start.
For any compressor alarm events occur the procedure is stopped and the compressor will be stopped.
PAR. CO30 = 3 OFF UNIT WITH PUMP DOWN in CHILLER MODE (No PUMP – DOWN at START-UP)
In Heat pump mode the Pump down process is inhibited and the solenoid valve works in parallel with the compressor.
23.2 PUMP DOWN WITH DEDICATED PRESSURE SWITCH
PAR.CO30 = 1 OFF UNIT WITH PUMP DOWN ( No PUMP – DOWN at START-UP)
The function is enabled if one relay output is configured as pump down solenoid valve for circuit 1 and 2 and one digital input as pump
down pressure switch of the circuit 1 and 2.
When the thermoregulation is going to stop, before turning off the last compressor, the solenoid valve is closed. The compressor runs
until the pump down pressure switch connected to the digital input becomes active for a maximum time set in CO33.
If the last compressor stops before the pump down pressure switch because of the CO33 time-out (maximum compressor on time after
turning off the P.D. solenoid valve), the ICHILL calculates the AL28 parameter (maximum number of pump down alarm per hour) and if
an alarm occurs the display will show the alarm code, the buzzer and the alarm relay will be on.
If the thermoregulation is stopped via digital input (as remote off) or from chiller/heat pump keys, during the pump down process the
chiller or the heat pump led will blink.
When the next thermoregulation restarts the PD solenoid valve turns on and after 1 seconds, if the low pressure switch is not active, the
compressors start.
For any compressor alarm events occur the procedure is stopped and the compressor will be stopped.
PAR. CO30 = 2 ON/OFF WITH PUMP DOWN
The function is enabled if one relay output is configured as pump down solenoid valve for circuit 1 and 2 and one digital input as pump
down pressure switch of the circuit 1 and 2. (CO30 = 2 or 4 are related to a pressure switch dedicated to this function or the pressure
transducer).
When the thermoregulation is going to stop, before turning off the last compressor, the solenoid valve is closed. The compressor runs
until the pump down pressure switch connected to the digital input becomes active for a maximum time set in CO39.
If the last compressor stops before the pump down pressure switch because of the CO33 time-out (maximum compressor on time after
turning off the P.D. solenoid valve), the ICHILL calculates the AL28 parameter (maximum number of pump down alarm per hour) and if
an alarm occurs the display will show the alarm code, the buzzer and the alarm relay will be on.
If the thermoregulation is stopped via digital input (as remote off) or from chiller/heat pump keys, during the pump down process the
chiller or the heat pump led will blink.
When the next thermoregulation restarts the PD solenoid valve turns on and after 1 seconds, if the low pressure switch is not active, the
compressors start.
If the compressors doesn’t restart within the CO33 time the pump-down alarm will signalled and the compressor are stopped. In this
case if AL30 =0 the compressor can restart only if the pressure switch becomes active, or if AL30=1 and the number of alarms per hour
becomes =AL29 only after the manual reset.
PAR. CO36 = 3 OFF UNIT WITH PUMP DOWN in CHILLER MODE (No PUMP – DOWN at START-UP)
In Heat pump mode the Pump down process is inhibited and the solenoid valve works in parallel with the compressor.
PAR. CO36 = 4 ON and OFF UNIT WITH PUMP DOWN in CHILLER MODE
In Heat pump mode the Pump down process is inhibited and the solenoid valve works in parallel with the compressor.
23.3 PUMP DOWN FUNCTION WITH DEDICATED PRESSURE PROBE
PAR.CO30 = 1 STOP UNIT with PUMP DOWN ( No PUMP – DOWN at START-UP)
The function is enabled if one relay output is configured as pump down solenoid valve for circuit 1 and 2 and one analogue input as low
pressure probe of the circuit 1 and 2.
When the thermoregulation is going to stop, before turning off the last compressor, the solenoid valve is closed. The compressor runs
until the pump down pressure connected to the analogue input reaches the set value in CO31.
If the last compressor stops before the pump down set value because of the CO33 time-out (maximum compressor on time after turning
off the P.D. solenoid valve), the ICHILL calculates the AL28 parameter (maximum number of pump down alarm per hour) and if an
alarm occurs the display will show the alarm code, the buzzer and the alarm relay will be on.
If the thermoregulation is stopped via digital input (as remote off) or from chiller/heat pump keys, during the pump down process the
chiller or the heat pump led will blink.
When the next thermoregulation restarts the PD solenoid valve turns on and after 1 seconds, if the low pressure switch is not active, the
compressors start.
For any compressor alarm events occur the procedure is stopped and the compressor will be stopped.
PAR. CO30 = 2 UNIT START/STOP with PUMP DOWN
The function is enabled if one relay output is configured as pump down solenoid valve for circuit 1 and 2 and one analogue input as low
pressure probe of the circuit 1 and 2.
When the thermoregulation is going to stop, before turning off the last compressor, the solenoid valve is closed. The compressor runs
until the pump down pressure probe connected to the analogue input reaches the setpoint in CO31.