UST500 CONTROL BOARD06MC0074@00B010014/04/201057Defrost (folder PAr/dF)Defrost parameters can be viewed and configured in folder dF (see User Interface and Parameters sections).The defrost function is active in HEAT mode only.It is used to prevent ice from forming on the surface of the external exchanger.Ice builds up on the external exchanger more often as a result of cold external air containing a high degree of humidity.This significantly impairs the thermodynamic output of the machine and could damage the machine itself.Defrosting is enabled when:• enabled via parameter (dF00 - Enable defrost function = 1)• the reversing valve is presentThe start and end of defrost depends on the values read by probes and by the values set for the parameters described below:Parameter Description Value0 1dF00 Enable defrost function DefrostdisabledDefrostenabledDefrost Parameter DescriptionInput dF01 Setpoint to enable interval count between defrostsOutput dF02 • Deactivate defrost setpointInput dF03 Cumulative interval between defrostsInput dF04 Compressor-valve-compressor delay before start defrostOutput dF05 Compressor-valve-compressor delay at end of defrost.Output dF06 Dripping timeOutput dF07 Maximum defrost time.Input dF08 Enable dynamic defrost differentialInput dF09 Maximum dynamic defrost differentialInput dF10 Defrost dynamic differential setpointInput dF11 Dynamic defrost differential proportional bandInput dF12 Select probe to enable interval count between defrostsOutput dF13 Select probe to end defrostOutput dF14 Setpoint to clear cumulative time between defrostsDuring defrost, the internal exchanger heaters are enabled in accordance with the relative parameter.Heaters Parameter Description Value0 1See ElectricHeaterssection.HI02 Enable force heaters on during defrost.Heaters enabled onrequest oftemperaturecontroller (antifreezeor integrated use).Heaters ALWAYSenabled duringdefrost
