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1592015300 User manual iCHILL 200 L GB r1.3 09/09/2005
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 do not restart within the CO39 time the pump-down alarm will signalled and the compressor are stopped. In this case
if AL23 =0 the compressor can restart only if the pressure switch becomes active, or if AL23=1 and the number of alarms per hour
becomes =AL22 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.
29.3 P
UMP
D
OWN FUNCTION WITH DEDICATED PRESSURE PROBE
PAR.CO36 = 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 CO37.
If the last compressor stops before the pump down set value because of the CO39 time-out (maximum compressor on time after turning
off the P.D. solenoid valve), the ICHILL calculates the AL21 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. CO35 = 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 CO37.
If the last compressor stops before the pump down pressure switch because of the CO39 time-out (maximum compressor on time after
turning off the P.D. solenoid valve), the ICHILL calculates the AL21 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 pressure probe is higher then CO37,
the compressors start.
If the compressors do not restart within the CO39 time the pump-down alarm will signalled and the compressor are stopped. In this case
if AL23 =0 the compressor can restart only if the pressure switch becomes active, or if AL23=1 and the number of alarms per hour
becomes =AL22 only after the manual reset.
PAR. CO36 = 3 START 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 UNIT START/STOP WITH PUMP DOWN in HEAT PUMP
In Heat pump mode the Pump down process is inhibited and the solenoid valve works in parallel with the compressor.
29.4 P
UMP
D
OWN ALARM DURING COMPRESSORS START
-
UP
ACTIVATION
If within the CO39 delay time (Maximum pump down restart time) the compressor/s do not restart because of the low pressure, the
instrument will signal B1PL (pump down alarm at the start-up of the circuit 1) or the label B2PL (pump down alarm at the start-up of the
circuit 2). With active alarm the restart procedure is disabled. The alarms can be:
•
with Automatic Reset that is not logged, the buzzer and alarm relay are not activated.
•
with Manual Reset that is logged, the buzzer and alarm relay are activated.
The Parameter AL22 determines the number of pump down alarm events to turn from automatic to manual reset
The Reset is always manual if AL22 = 0
The Reset is always automatic if AL22 = 16
The reset becomes manual after AL22 = 1 ..15 events and the configuration of Par. AL23.
Par.
AL23 defines if the reset of the AL22 alarm events can be forced from manual to automatic. In this case the alarm events, after
reaching AL22, is automatically reset but it is logged while the buzzer and the alarm relay are on.
In this way, in case of particularly critical condition, the unit restarts working without the help of the maintenance personnel.
RESET
•
The Automatic Reset is activated when the next compressor thermoregulation is requested, in this case the pressure condition of
the pump down must be satisfied.
•
The Manual Reset needs to enter the function Menu under the AlrM label. After the reset the next thermoregulation restarts if the
pump down pressure is in normal condition.