Evco EV3 200 WEB - 6.2 Adaptive Defrost Strategies

1143W24E4.00 · EV3 200 Web 03/2021
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6.2.4 Adaptive defrost
Adaptive defrost is set with the following parameters:
Par. Description MU Range
SP Temperature setpoint. °C/°F r1...r2
d8 Defrost interval count mode. 3=Adaptive; --- 0...4
d18 Adaptivedefrostinterval. min 0...999
d19 Adaptivedefrostthreshold(relativetooptimalevaporationtemperature). °C/°F 0.0...40.0
d22
Evaporation threshold for adaptive defrost interval count (relative to optimal evaporation
temperature).
°C/°F -10.0...10.0
Operation
Adaptivedefrostworksbydividingtemperatureregulationintotwophases:
• Calibration phase and;
• Normalworkingphase.
Calibration phase
Whentherefrigeratingmachineisswitchedonorafterdefrost,thedevicecalculatestheidealevaporatorworkingtemperature
to reach the setpoint SP.
Normal working phase
Duringthenormalworkingphase,thedeviceaddsupthecompressorONtimeswhilethetemperaturereadbyPb2islower
than the ideal evaporator temperature.
Defrost is activated if:
• The count exceeds the time d18;
• The temperature read by Pb2 goes below the ideal temperature calculated of a threshold d19.
Pb2
Calibration Normal work
End of
calibration
ON
SP
SP+r0
OFF
ON
OFF
A
B
C
A+B+C+...+x = d18
Pb1
d9
SP
Ideal evaporator
temperature (TEi)
Fig. 19. Modular defrost: Adaptive - start defrost due to time