15
150” 5” 90” 150”90”150”
30/35
5.7
60”
60”
30” 30”
60”
The defrosting process is activated during heating mode in the heat pump units, when the outside temperature is low and the
outdoor coil is likely to be frozen. To melt the ice, the defrosting function will switch the unit to cooling operation for a short period.
During defrosting mode, the low pressure is at minimum level, so the pressure switch is disabled in this mode.
The defrost cycle is illustrated in the following picture.
9.- DEFROST
ADVANCED FUNCTIONS
WATER PUMP- WATER FLOW SWITCH (ECOLEAN)
The water ow switch ensures that the water pump does not work when there is no water ow. At rst, there is a by-pass during
the rst 150 seconds of water pump operation which operates according to the water ow switch signal. When the alarm has been
activated, the water pump is stopped. The water pump starts again every 90 seconds for 150 seconds, in order to try to reset the
alarm. This procedure is repeated 5 times and after that the pump remains stopped until the alarm is reset manually.
ALARM
PUMP
close
open
ow
If the pressure does not reach 30/35 bars within 8 minutes from the start of the defrost cycle, the cycle nishes because of maxi-
mum time and the display shows “dF1” or “dF2” (according to the circuit).
The time between two defrost cycles for the same circuit is 40 minutes. The time between two defrost cycles of the two circuits is
10 minutes.
Condenser pressure
(bar)
Compressors
Reverse valve
HEAT
DEFROST
HEAT
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