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Specifications
2 defrost end mode (timing, controlled by both temperature and time), dripping, manual defrost, sensor error alarm,Temperature Controller D20
Main Function
Temperature display, temperature controlling(refrigeration/heat mode can be set),compressor start delay protection, 2 defrost modes (electric heat, hot gas), 2 defrost start mode (time alternation, accumulative compressor running time), 2 defrost end mode (timing, controlled by both temperature and time), dripping, manual defrost, sensor error alarm, one external alarm input, password, C/F unit change.
Technique Index
1,Temperature display range: -50~150°C(The resolution is 0.1°C)
-58~302°F(The resolution is 0.1°F)
2,Power supply: AC 220V±10% or AC 380V±10% 50Hz (Refer to the wiring diagram)
3,Operating environment: temperature -10°C~50°C, humidity≤85%
4,Relay contact capability: compressor 20A/250VAC, defrost 8A/250VAC (pure resistive load)
5,Temperature sensor: NTC R25=5kΩ, B (25/50) =3470K
Operating Guide
1, Meaning of the index lights on the panel
Index light |
Name |
Light |
Flash |
|
Temp setting |
In the state of temp setting |
- |
|
Refrigeration |
Refrigerating |
Ready to refrigerate, in the state of compressor start delay protection |
|
Heat |
Heating |
Ready to heat, in the state of compressor start delay protection |
|
Defrost |
Defrosting |
Dripping or the state of compressor start delay protection |
|
- |
- |
- |
|
Alarm |
- |
Alarm state |
2,Meaning of the LED display
The LED usually shows temperature, if it shows “SHr”, it means the temperature sensor is short, and “OPE” means the temperature sensor is open. The temperature and the alarm code (Axx) will show alternately when in the alarm state. The code is showing below:
Code |
Meaning |
Explanation |
A11 |
External alarm |
Alarm from external alarm signal, refer to the internal parameter code “F50” |
A21 |
Temperature sensor error |
Open or short(showing “OPE” or “SHr”) |
A22 |
Evaporator sensor error |
Open or short(showing “OPE” or “SHr” when press the key “6”). If you don’t need to use the evaporator sensor, you can use the F59 to close the alarm. |
3,The temperature of the evaporator sensor display
When displaying current temperature, press “6” key, the controller will display defrosting temperature. Loose “6” key, then return to current temperature. Notice that if you press the key and hold it for 5 seconds, the controller will enter or exit the defrosting state forcibly.
4,Set temperature
Press the key “S” for at least 2 seconds, then enter the state of temperature setting, the LED displays the setting temperature, then using “5” key or “6” key can change the parameter(the key “5” adds 0.1°C, the key “6” minuses 0.1°C, press and hold it over 0.5 seconds can add or minus rapidly). After setting, press “S” again, then exit the state of parameter setting. Pressing the key “M” in the setting process means cancel and exit, but the setting value will not be saved.
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