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1592015820 User manual IC260_261L_D DUO FW1.9 rel. 1.0
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When the last compressor is switched off, the water pump / supply fan is switched off after CO18 delay from
compressor.
When the unit is in stand-by or remote off and the Ar09 =1, if the regulation requires the antifreeze heaters
also the water pump is turned on.
The pump is always off when:
Remote OFF from digital input.
Water pump overload.
Evaporator flow switch alarm if MANUAL reset.
During the defrost and when the compressor is off in dripping time the water pump/supply fan is on.
31.1 Evaporator Pump Group
It is possible to configure two evaporator water pumps; the water pump to be activated is the pump with less
working hours.
When a water pump works continuosly for CO19 time, the other one is switched on and after CO20 second
the first one is switched off.
If a water pump overload occurs, the water pump is switched off and the other one is switched on.
Note: During the defrost and when the compressor is off in dripping time, the pump is on.
31.2 Modulating Evaporator Water Pump
To enable the modulating evaporator water pump is necessary to configure an analog output as “Modulated
evaporator water pump” (see analog and digital output configuration) .
The modulating evaporator water pump is enabled in cooling, heating and sanitary hot water production; if
the machine is in STD-BY or OFF the water pump is OFF.
The water pump works according the Dt between two probes, which can be choosen both in summer an
winter mode, among those configured in the instrument (Pb1, Pb2,…).
If the state of the water pump is tied to the state of the compressor, when last compressor is switched off the
water pump is forced to run at US60 speed for CO18 minutes, then it is switched off.
If the state of the water pump is not tied to the state of the compressor, when last compressor is switched off
the water pump is forced to run at US60 speed.
The regulation is done as showed below.
Chiller and c sanitary hot water (machine with valves OUt1 and OUT2 in the gas circuit)