User manual

1592022700 User manual iCHILL 200CX Rel. 1.0 22/04/2009
Pg.46/114
Note: During the defrost and when the compressor is off in dripping time the pump is on.
28 WATER PUMP OF THE CONDENSER
28.1 CONDENSER WATER PUMP CONTROL
Operative mode of the condenser water pump
CO20 = 0 Not enabled, pump not controlled.
CO20 = 1: Continuous control type 1.
The water pump is running only if the unit is running (in chiller or heat pump). After giving the start in chiller or heat pump mode the
compressor regulation starts only after the time delay CO16.
The water pump is turned off only when the unit is turned off (stand-by) and, if CO21≠0, the water pump turns off only after the this
delay.
When the unit is in stand-by or remote off and the parameter Ar21=1, if the antifreeze thermoregulation requires the water pump is
turned on.
CO20 = 2: on compressor demand.
When the compressor turns on also the water pump is turned on. In both chiller and heat pump modes the water pump starts CO16
before the compressor. When the last compressor is turned off the water pump is turned of after the CO21 delay.
When the unit is in stand-by or remote off and the parameter Ar21=1, if the antifreeze thermoregulation requires the water pump is
turned on.
CO20 = 3: Continuous control type 2.
The water pump is always running (when the unit is on and when the unit is in OFF or STD-BY).
After the power on the compressor regulation starts with a delay of CO16 from pump activation.
When the unit is in stand-by or remote off and the parameter Ar21=1, if the antifreeze thermoregulation requires the water pump is
turned on.
CO20 = 4: modulating control type 1.
The water pump is running only if the unit is running (in chiller or heat pump). After giving the start in chiller or heat pump mode the
compressor regulation starts only after the time delay CO16.
The water pump is turned off only when the unit is turned off (stand-by or remote OFF); in this case the pump is forced at maximum
speed and then switched off.
When the unit is in stand-by or remote off and the parameter Ar21=1, if the antifreeze thermoregulation requires the water pump is
turned on.
The pump, if activated, works as described below (par. 38); when the compressor is OFF or when the unit is in OFF or STD-BY the
pump is forced at CO92 speed.
CO20 = 5: modulating control on compressor demand.
When the compressor turns on also the water pump is turned on; in this case the pump is forced at maximum speed for CO91 seconds
then the compressor is activated (after CO16 if ≠0).
When the last compressor is turned off the water pump is forced at maximum speed for CO93 seconds and then switched off.
CO20 = 6: modulating control type 2.
The water pump is always running (if the unit is running in chiller or heat pump but also if the unit is OFF or STD-BY); when the unit is
OFF or STD-BY or when the compressor is OFF the pump is forced at CO92 speed.
After the power on the compressor regulation starts only after the time delay CO16.
When the unit is in stand-by or remote off and the parameter Ar21=1, if the antifreeze thermoregulation requires the water pump is
turned on.
The pump, if activated, works as described below.
During the defrost and when the compressor is off in dripping time the pump fan is on.
29 PUMP GROUP OF THE CONDENSER
If two relay outputs are configured as condenser water pump and support pump of the condenser automatically the pump group control
is enabled.
First start-up of the unit with running hours of the two pumps are both 0: if CO20=1 or 2 (continuous or on compressor demand pump
mode) by default the pump n°1 is turned on. The successive restart of the unit is made with the pump n°2.
During the normal functioning condition when the unit changes from a stand-by /remote off/ power off status to chiller or heat pump
mode the pump that is running is switched off and immediately the one with less running hours is turned on.
When the unit goes in stand-by or remote off the pump is switched off after the time set in CO21; next pump to be activated is the pump
with less working hours.
When the unit is in stand-by or remote off and the parameter Ar21=1, if the antifreeze thermoregulation requires the water pump is
turned on.
29.1 CONDENSER WATER PUMP ROTATION
Par. CO22 ≠ 0 to enable the function.
During the normal functioning condition if one pump reaches the running hours of the CO22 parameter, the pump is turned off while the
other pump is activated.
If the CO23 ≠0, before changing from one to the other the two pumps work together for the time set in this parameter. If CO23=0 the
rotation is immediate.
ATTENTION
The CO16/CO21 values, on and off delay between compressors and pumps, are calculated also for the pump group.