IC100C Series PRELIMINARY
1592015000 Manual IC100C Series 28/05/03 Page 25 di 38
supply black-out or changed functioning mode the
defrost is postponed and the dF10 is reloaded. The
counting stops if the compressor stops or if the
temperature/pressure becomes higher than DF03.
dF11 Start Defrost Setpoint. It is enabled when (Pb4
CF07=5) and (Pb3 CF06=1 o 2 ).
The counting begins when the temperature/pressure
of Pb3 probe becomes lower than dF03. When the
dF10 delay time is expired the controller check the
Pb4, if lower than dF11 the defrost starts otherwise
the unit will continue in Heat Pump. Just after Pb4
becomes lower than dF11 the defrost starts.
dF12 End of combined defrost temperature.
It permits to set the temperature over which the
combined defrost stops working.
The analogue input Pb4 configured in CF07 =5
enables the combined end defrost control. The defrost
cycle stops when Pb4 reaches this setpoint.
dF13 2
nd
Compressor ON during the defrost cycle.
0 = OFF; 1 = 2
nd
Compressor ON
If the unit is configured with 2 compressors CF21=2
and dF13=1, both the compressors are ON in defrost.
The delay times are not calculated therefore ON and
OFF compressor is instantaneous.
dF14 Condenser Fan ON during defrost and draining
cycles (dF09).
0 = Not Enabled;
1 = Enabled only in defrost cycle;
2 = Enabled in defrost and draining cycles.
If dF14=1 and the condensing temperature/pressure
increases over dF15 value, the fan control will be
driven with the Chiller configuration fan parameter.
If dF14=2 after the defrost, for the time set in dF09
the fan will be forced to maximum speed.
dF15 Temperature/pressure setpoint to force the fan.
dF16 Low alarm detection during defrost.
0 = not enabled; 1 = enabled.
dF17 Low alarm delay time in Heat Pump mode.
With dF08 and dF09 set to 0 (compressor does not
stop and 4-ways valve immediately active), the
pressure of the circuit is not well balanced for valve
changing. In this case the dF17 delay starts counting
each time the valve changes its status to avoid
stopping the unit for low alarm.
dF18 4-ways inverting valve polarity.
0 = Active in chiller; 1 = Active in Heat Pump.
dF19 Temperature/pressure Setpoint to force the
defrost cycle.
dF20 Differential for forced defrost.
36.9 Alarm Parameters
AL01 Low pressure alarm delay time.
It determines the time delay before signalling the low
pressure alarm from digital input.
AL02 Maximum number of “low pressure alarm” /
hour before turning to manual reset procedure
AL03 Low alarm detection with unit in Off or Stand-by.
0 = Alarm not enabled; 1 = Alarm enabled.
AL04 Water flow alarm delay time. After starting the
water pump the alarm is suppressed for this time.
AL05 Maximum number of “ Water flow alarm” in one
hour.
If the number of flow alarm events reaches the value
set in this parameter in one hour, the alarm turns to
manual reset procedure. The water pump is turned
off.
ATTENTION with CF01=2, 3, 4, 5 the minimum value
is 1 event.
AL06 Minimum activation time for water flow alarm.
The alarm is detected only if the condition persists for
the time set in this parameter. The counting starts
only after the AL04 is expired. It prevents from
possible alarms due to the presence of air into the
water pipe.
Water flow alarm note: the open collector and relay
alarm outputs works only for alarm conditions during
the functioning. In the other cases the alarm is only
displayed with blinking icon. With Boiler function the
active alarm stops the pump. The evaporator is
automatically protected with the anti-ice control.
CO11=0 Water pump not present.
The alarm is managed only if one of the digital inputs
is configured as water flow, the alarm reset is
automatic.
CO11=1 “Water pump on” continuously.
The alarm is managed only if one of the digital inputs
is configured as water flow, the alarm reset is
automatic with Stand–by or remote Off (pump off).
The pump is running until reaches AL05 alarm events
if working in Chiller or Heat Pump mode. In this case
the loads will be deactivated as described in table and
the reset turns to manual procedure.
CO11=2 “Water pump on” in parallel with compressor.
The alarm is managed only if one of the digital inputs
is configured as water flow, the alarm reset is
automatic with Stand–by or remote Off (pump off). It
turns to manual reset procedure after reaching AL05
alarm events in Chiller or Heat Pump mode. The
loads are deactivated as described in table 34. The
water pump follow the cycle with CO06 On delay time
and CO07 Off delay time; after AL05 alarm events is
stopped.
Water flow alarm manual reset procedure.
After AL05 alarm events it is necessary to enter the
function Menu to reset it. The flow icon is lighted and
does not disappear if the alarm is still active. The
water pump, if managed, can start and the alarm is
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