User manual

1592022700 User manual iCHILL 200CX Rel. 1.0 22/04/2009
Pg.44/114
24.6 REGULATION IN HEAT PUMP MODE
UNLOADING IN HEAT PUMP MODE
The compressor unloading in heat pump mode is managed by the analogue input configured as evaporator probe circuit 1 or 2.
When the heat pump thermoregulation request begins to start the compressors, if the evaporator pressure/temperature is equal or lower
than CO43 setpoint the unloading process, of that circuit probe, is engaged. The bottom display shows (alternated with the
measurement) the b1Cu (circuit 1) or b2Cu (circuit 2) labels. When the function is active, the number of working compressors/step is
determined by the CO46 parameter.
UNLOAD DE-ACTIVATION in HEAT PUMP MODE
If the evaporator temperature is higher than the value determined by CO43+CO44 (setpoint +differential), the unloading is disengaged,
the compressors are all available for the thermoregulation.
OTHER INFORMATION ABOUT THE UNLOADING IN HEAT PUMP
If the pressure/temperature is higher than CO43 but lower than CO43+CO44, to avoid a prolonged working time in unloading status, a
timer is activated to disable the unloading function.
This time starts when the evaporator inlet temperature is higher than CO43 and, when elapsed, the unloading function is disabled.
24.7 LOW TEMPERATURE OF THE EVAPORATOR WATER OUTLET
ACTIVATION
The lower value between the inlet evaporator probe, common outlet evaporator probe or outlet probe for the circuit, enable the
unloading function.
When the value of one of the probes above goes down under the set point CO38 the unloading function is activated; the number of
active compressors/step is determined by the CO46 parameter.
The display shows the label b1EU – b2EU alternated to a default visualization.
DE-ACTIVATION
Unloading function is disabled when the temperature of all the probes configured rise over CO38 + CO39 or when the CO40 time is
elapsed.
25 SOLENOID VALVE FOR LIQUID INJECTION
The function is enabled when one output relay is configured as solenoid valve compressor 1 and one analogue input is configured as
discharge temperature of compressor 1.
25.1 FUNCTIONNING
When the compressor is off the solenoid valve output is always OFF.
When the compressor is on if the PTC temperature of the compressor discharge reaches CO48 setpoint, the valve turns ON; when the
temperature decreases under C48-CO49 (set- differential) the valve turns off.
ATTENTION
The display resolution is 0.1°C until the read-out is 99.9, over 100°C it is 1°C.
26 WATER PUMP OF THE EVAPORATOR / SUPPLY FAN
26.1 WATER PUMP OF THE EVAPORATOR / SUPPLY FAN (AIR/AIR UNIT)
Operative modes of the evaporator pump / supply fan
CO15=0: Not enabled: water pump/supply fan not managed.
Attention: The air / air unit configured with CO15= 0 does not manage the output for integration heaters.
CO15 = 1: Continuous control type 1.
The water pump/ supply fan are 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/ supply fan are turned off only when the unit is turned off (stand-by) and, if CO17≠0, the water pump/ supply fan 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.
CO15 = 2: on compressor demand.
When the compressor turns on also the water pump/ supply fan are turned on. In both chiller and heat pump modes the water pump/
supply fan starts CO16 before the compressor. When the last compressor is turned off the water pump/ supply fan is turned of after the
CO17 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.
CO15 = 3: Continuous control type 2.
The water pump/ supply fan are 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.