Evco EV3 200 WEB - 6. Defrost Functions; 6.1 Defrost Cycle Introduction

1143W24E4.00 · EV3 200 Web 03/2021
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6. DEFROST
6.1 INTRODUCTION
Defrosting removes ice from the surface of the evaporator. The defrost cycle consists of 4 phases:
1. Defrost;
2. Pre-dripping;
3. Dripping;
4. Post-dripping.
Attheendofeachphase,thecontrollerstartsupthenextone;whentheentiredefrostcycleisfinished,thecontrollerreturns
to normal operation.
With d0=0,defrostissettomanualoperation.Forautomaticmode,setd0 > 0.
6.1.1 Types of defrost
The controller can operate with two different types of defrost:
• Modular;
• Standard.
6.2 ADAPTIVE DEFROST
Adaptivedefrostissetbythefollowingparameters:
Par. Description MU Range
d0
Automaticdefrostinterval.0 = Manual defrost only
N.B.: if d8=3,themaximumintervalisconsidered.
h 0... 99
d8
Defrost interval count mode. 0 = Hours device ON; 1 = Hours compressor ON;
2 = Hours evaporator temperature < d9; 3=Adaptive;4 = In real time (RTC).
--- 0...4
d9 Evaporation threshold for automatic defrost interval count. °C/°F -99.0...99.0
d18 Adaptivedefrostinterval.0 = Manual only. 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
6.2.1 Defrost with Hours device ON
Defrost with Hours device ON is set with the following parameters:
Par. Description MU Range
d0
Automaticdefrostinterval.
0 = Manual defrost only
N.B.: if d8=3,themaximumintervalisconsidered.
h 0... 99
d8 Defrost interval count mode. 0 = Hours device ON; --- 0...4
Operation
The controller begins counting the operating hours from when the device is switched on. If d0 >0 and d8=0,oncetimed0 has
elapsed,thedevicecarriesoutdefrostofthedurationofd3.
The d0 count is set to zero (and restarts) every time defrost starts up.
ON
d0
OFF
ON
OFF
d0
d3 d3
ON
Fig. 16. Modular defrost: Hours device ON