User manual

1592022700 User manual iCHILL 200CX Rel. 1.0 22/04/2009
Pg.40/114
Having one compressor with 3 partializations, at the compressor start-up, with CO07=0, the partialization valve is enabled only for the
time CO12 but it won’t be never used during the thermoregulation. After the compressor stops running the time CO12 will be reloaded.
Having one compressor with 3 partializations, at the compressor start-up, with CO07=1, the partialization valve is enabled for the time
CO12 and it will be considered also as thermoregulation step. After the compressor stops running the time CO13 will be reloaded.
EXAMPLE WITH SCREW COMPRESSOR
Having one compressor with 3 partializations, with CO07=2 when the compressor is off the partialization valve is always on, so as, in
case of start-up, it allows to have the minimum load. After the compressor is started the valve is on only for CO12 time and it won’t be
considered as regulation step. After the compressor stops running the time CO12 will be reloaded.
Having one compressor with 3 partializations, with CO07=3 when the compressor is off the partialization valve is always on, so as, in
case of start-up, it allows to have the minimum load. After the compressor is started the valve is on for CO12 time but it will be
considered as regulation step. After the compressor stops running the time CO12 will be reloaded.
21.2 BY- PASS GAS VALVE DURING COMPRESSOR START- UP
It allows to manage, with the partialization valve, also the valve to run the compressor with no load by-passing the circuit.
On time of the by-pass gas valve during the compressor start-up.
The funcrion is enabled if the CO12≠0 and one of the relay output is configured as by-pass valve compressor 1 or 2.
Functionning: When thermoregulation requires the relay is turned ON 1 second before turning in the compressor and goes off after the
time set in parameter CO12. After the compressor stops running the time CO12 will be reloaded.
21.3 SOLENOID VALVE INTERMITTENT FOR SCREW COMPRESSOR
If configured this output is ON when the compressor is ON (in case of Part Winding it corresponds with the first relay on) for the time set
in Par. CO08 and then OFF for the time set in Par. CO09. The cycle CO08 – CO09 of the valve is repeated until the compressor is ON.
ATTENTION:
When the valve output is configured, the intermittent cycle is activated only if the Par. CO08≠0.
22 THERMOREGULATION OF THE COMPRESSORS WITH DIFFERENT SIZE
The function is enabled if:
•
••
• circuit 1 configured with 2 compressors
•
••
• weight of the compressors ≠ 0 and different for each one
•
••
• thermoregulation neutral zone
CO69
Compressor 1 weight 0 100 %
CO70
Compressor 2 weight 0 100 %
CO71
Maximum numbers of start up per hour
0= function disabled
0 60
Example: circuit 1 with 2 compressors:
• in case of request of thermoregulation, the first compressor to be activated is the compressor with lower size
• if the request increase, the compressor is switched off and is activated the compressor with higher size
• if the request is 100% both compressors are activated (respecting the security time of the compressors)
The regulation is a steps; if two compressors with different size are configured, 3 steps are available.
ATTENTION:
When a compressor reach the maximum number of start up per hour, at the next request of thermoregulation is activated the other
compressor.
23 PUMP DOWN
23.1 OFF UNIT WITH PUMP DOWN AND WITH LOW PRESSURE SWITCH CONTROL
The process is enabled if the low pressure switch of the circuit is configured with parameter CO30 = 1 or 3 and one of the relay output is
configured as pump-down solenoid circuit 1 or 2 (CO36 = 2 or 4 are related to a pressure switch dedicated to this function or the
pressure transducer).
When the thermoregulation requires to stop the compressors, before to turn off the last compressor the solenoid valve is closed. The
compressor runs until the low pressure switch connected to the digital input becomes active for a maximum time set in CO33. In this
case there is no Low pressure alarm and no alarm message will be displayed, the digital input active function will disable the last
running compressor. A possible low pressure alarm could appear only if the digital input is still active after the AL02 time.