1592015300 User manual iCHILL 200 L GB
r1.3 09/09/2005
Pg.
78/105
The count-down to the defrost cycle starts when the temperature/pressure of the probe, configured as condensing/evaporating circuit 1
or 2 probe, is lower than dF02 parameter.
After the dF09 counting the instruments checks the temperature probe value (configured as combined defrost circuit 1 or 2) and if it is
lower than dF10 (temperature setpoint to start the defrost of the circuit1) or dF12 (temperature setpoint to start the defrost of the
circuit2) the defrost cycle starts otherwise the unit still runs in heat pump mode.
When the temperature decreases under the dF10 or dF12 values the defrost immediately start.
The defrost ends when the NTC combined defrost probe 1 or 2 increases over dF11 (circuit1) or dF13(circuit2).
If the defrost is enabled the display allows to show the external temperature on the top display and the labels
dEF1
(circuit1)
or
dEF2
(circuit2) on the bottom display aof the circuit read-out function.
38.3 M
ANUAL DEFROST
The manual defrost key function is enabled if the unit is on with at least one compressor running.
The defrost start temperature/pressure of the controlled probe must be lower than dF02 setpoint value while if the combined defrost is
active the detected temperature must be lower than dF10 or dF12.
At this point by pushing
SET
+
UP
for more than
5
seconds the manual defrost starts.
ATTENTION:
the manual defrost is not related to the dF09 /dF06 delay times, therefore the forced defrost cycle, if condition are OK,
is immediately executed for both circuits.
38.4 D
EFROST START CONDITION WITH TWO CIRCUIT UNIT
Parameter involved: dF22
0= Independent
1= Only if both circuit conditions are satisfied
2= At least one circuit condition is satisfied
38.5 E
ND OF THE DEFROST IN A TWO CIRCUITS WITH ONE CONDENSING FAN CONTROL UNIT
Parameter involved: dF23
0= Independent
1= Both circuits have reached the conditions to stop the defrost
2= At least one circuit has reached the end defrost condition
Table of defrost cycle for units with 2 circuits
Parameter
dF23=0 dF23=1 dF23=2
dF22=0
Yes
not possible (ACF1)
not possible (ACF1)
dF22=1
Yes Yes Yes
dF22=2
not possible (ACF1)
Yes
not possible (ACF1)
ATTENTION:
The configuration error ACF1 is displayed if the parameter value of dF22 and dF23 is not permitted.
For only one condensing unit the dF22 and dF23 values must be not equal to 0.
38.6 A
UTOMATIC DEFROST PROCEDURE
Phase 1
: time counting of dF09 (Interval defrost of the same circuit), unit is working in heat pump mode and at least one compressor is
running, the defrost led
is blinking
, the condensing-evaporating temperature or pressure must be lower than dF02 value. (see
start probe par. dF24)
Functioning of the time counter:
1.
The dF09 counter is reloaded
se if the power supply fails, after a defrost cycle and after the unit changes from chiller to HP.
2.
The dF09 counter is stopped
if the last compressor turns off or if the pressure-temperature of the condensing-evaporating probe
becomes higher than dF02 parameter value.
3.
The counter is decremented
if the condensing or evaporating temperature-pressure probe value becomes lower than the dF02
parameter value.
2
nd
phase
: starts after the dF09 counting and check if the initial condition are satisfied to defrost
If one digital input si configured as “defrost end” of the circuit 1 or 2 and the contact is active, the unit waits until the contact is de-
activated.
Probe configured as combined defrost NTC of circuit 1 or 2
•
If the condensing or evaporating probe value of the 1
st
circuit is lower than dF10 and lower than dF12 for the 2
nd
circuit the process
step on the 3
rd
phase.
•
Otherwise th unit waits until the probe values decrease under dF10 and dF12.
If any of the probe is configured as combined defrost NTC the process steps on the 3
rd
phase.
When the circuit condition are satisfied to execute the 3
rd
phase the display shows the dF1 (circuit1) and dF2 (circuit2 ) labels.
To enter the
FASE 3
of the defrost the following conditions have to besatisfied:
3
rd
: inversion valve management Par.
dF07
(OFF compressor before the defrost)
If dF07=0: the valve is activated without stopping any conmpressor and the defrost cycle is immediately activated. If the
thermoregulation or the dF14 parameter require more compressors the dF16 (on compressor delay during defrost cycle) is loaded.
If df07 <> 0:
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