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
Adaptivedefrostinterval.
min
0...999
d19
Adaptivedefrostthreshold(relativetooptimalevaporationtemperature).
°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
Adaptivedefrostworksbydividingtemperatureregulationintotwophases:
• Calibration phase and;
•
Normalworkingphase.
Calibration phase
Whentherefrigeratingmachineisswitchedonorafterdefrost,thedevicecalculatestheidealevaporatorworkingtemperature
to reach the setpoint SP.
Normal working phase
Duringthenormalworkingphase,thedeviceaddsupthecompressorONtimeswhilethetemperaturereadbyPb2islower
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