IC100CX SERVICE MANUAL
Manual IC100CX GB Page 6 di 20
3. dF01=1 defrost cycle enabled
4. one relay configured as reversing valve
5. Pb3 or Pb4 must be configured as condensing probe (without active faulty probe
alarms).
If only one of these conditions is not satisfied the defrost does not operate.
When the condensing temperature/pressure falls below dF03, starts the counting of time
dF10. When the counting ends, if the temperature/pressure is lower than dF03 the
defrost starts.
The compressor is switched off for dF08 and, after dF08/2, the the 4-ways reversing
valve is activated. When the counting of dF08 ends the compressor is switched on
(CO01 and CO02 are disabled during the defrost).
The defrost ends when the temperature/pressure is >dF04 or for maximun time dF07.
At the end of the defrost, the compressor is switched off for dF09 and, after dF09/2, the
the 4-ways reversing valve is deactivated.
When the counting of dF09 ends, the compressor is switched on.
Forced Defrost
This function is enabled if dF05 0 and allows to activate a defrost even if the interval
time between defrosts is running and the temperature/pressure value is lower than the
parameter dF19 for the dF05 time.
If during the time delay dF05 thetemperature/pressure becomes higher than dF19+dF20
value, the whole procedure is stopped and the time delay dF05 will be reloaded.
Combined Defrost
This function is enabled if CF07 = 5 and Pb4 is configured as NTC probe for combined
defrost (placed typically on the evaporator coil). The detected temperature allows to
calculate a better defrost cycle giving the start and the end commands for the cycle
itself.
Functioning:
when the temperature detected by Pb3 probe is lower than dF03, the time delay dF10
starts.
When the time dF10 is elapsed the controller check Pb4 value: if it is lower than dF11
the defrost procedure starts, otherwise the unit still works in Heat Pump.
When Pb4 value is higher than dF12 the combined defrost ends.
Manual Defrost
This function is enabled if:
at least one compressor is running
the condenser temperature/pressure is lower than dF03
if the “combined defrost” is enabled, Pb4 value must be lower than dF11
If the conditions above are satisfied, by pushing o + SET (before o, then SET) for more
than 5 sec. the defrost cycle immediately starts.
FUNCTION FOR UNITS WITHOUT WATER STORAGE TANK
This function manages the compressor(s) to optimize the production of refrigerated
water in units with low thermal loads.
The function analyses the compressor operating time (from regulation start-up to
shutdown request) and compares it with the time configured with parameter CO01
(minimum ON time); when the regulation temperature reach the set point and the
operation time is lower than CO01, the controller modifies the set point and the
differential to increase the compressor operating time.
If the compressor operates for longer than the minimum time (CO01), when ST15 time is
elapsed (this time starts when the CO01 is elapsed) the function progressively restores
the set point and hysteresis to the initial values (ST01 or ST03); in this case:
Heat pump: whenever the time ST15 expires, the function subtracts the ST13 value to
the setpoint and ST14 value to the hysteresis
Chiller: whenever the time ST15 expires, the function adds the ST13 value to the set
point and subtracs the ST14 value to the hysteresis.
When the unit is switched OFF (by digital input or by keyboard), the set point and
differential are restored to the initial values (ST01…ST04).
Below the formulas for calculating the new set point and hysteresis.
Heat pump:
Set point = set point heat pump + Par ST13 + (CO01 – compressor working time*) x
ST16 / 10
Differential = differential heat pump + Par.ST14 + (CO01 - actual time*) x Par ST16 / 10
Chiller:
Set point = set point cool – [Par ST13+ (CO01 - compressor working time *) x Par ST16/
10]
Differential = differential chiller + Par.ST14 + (CO01 - compressor working time *) x Par
ST16 /10
*Compressor working time is in sec x 10.
The function for units without water storage tank is compatible with Energy Saving
function or with the Dynamic set point.
Visualization of the set point on the display:
Chiller with energy saving or dynamic set point enabled:
push “SET” button once = SetC (set point value from parameter)
push “SET” button twice = Sets or Setd (real operating set point value)
Chiller with energy saving or dynamic set point and function for machine without water
storage tank enabled:
push “SET” button once = SetC (set point value from parameter)
push “SET” button twice = Setr (real operating set point value)
Heat pump with energy saving or dynamic set point enabled:
push “SET” button once = SetH (set point value from parameter)
push “SET” button twice = Sets or Setd (real operating set point value)
Heat Pump with energy saving or dynamic set point and function for machine without
water storage tank enabled:
push “SET” button once = SetH (set point value from parameter)
push “SET” button twice = Setr (real operating set point value)
When the function for units without water storage tank is enabled, the protection for high
temperature o low temperature is active; the compressor/s will be switched off if:
Chiller: outlet evaporator temperature < ST11
Heat pump: outlet evaporator temperature > ST12
GEOTHERMAL CHILLER FUNCTION
This function, to work, requires the Ichill remote keyboad with internal probe to detect the
room temperature; the function is enabled if the parameter CF03=2.
The unit works according to Pb2 probe and the set point ST01 and ST03.
During the regulation, the compressor/s status (only compresor/s status) depend on the
room temperature and the user set point configured with parameters ST18 and ST22.
When the room temperature reach the user set point, the compressor/s are switched off;
in this case the other loads status (pump, fan, etc.) doesn’t depend from compressor
status (they work normally).
Manufacturer set point
The unit works on the manufacturer set point:
set point chiller ST01, differential chiller ST02;
set point Heat pump ST03, differential Heat pump ST04.
User set point
To visualize the room set point press the “SET” button on the remote keyboard or on the
controller.
To change the room set point press and hold the “SET” button: the set point value is
displayed flashing on upper display. To change its value press oor n keys and confirm
with “SET”.
Dynamic set point
The dynamic set point function, if enabled (Sd01=1), works normally (probe PB4) and
modify ST01 / ST03 set point. SEtd dynamic set point is displayed in the functions menu.
Energy saving
The Energy saving function,if enabled by clock or digital input, modify the room set point
(ST18 / ST22).
UNLOADING FUNCTION
High temperature inlet evaporator
The function allows the machine to operate in case of high evaporator inlet temperature
(to avoid possible high pressure intervention).
When the evaporator inlet temperature is greater than CO17 set point for a time of
CO19, a compressor (if two compressors are working) or the capacity control (in case of
one compressor with capacity step) is switched off.
When only one compressor is working or only the capacity step is active, the function
has not effect on the regulation.
When the function is activated the lower display shows “AEUn” label alternated to
default visualization.
The function is disabled if the evaporator inlet temperature is lower than CO17 set point
– CO18 differential.
Note
When the unloading function is active, to avoid a prolonged working time in this
condition, if the evaporator inlet temperature is lower than CO17 set point and higher
than CO17 – CO18 for a time of CO20, the function is disabled.
CO20 delay time starts when the evaporator inlet temperature is lower than CO17 set
point.
High pressure in chiller mode
The function allows the machine to operate incase of high outside temperature (start-up
in summer with hot external temperature), to avoid possible high pressure alarm.
