12V dc temperature controller D20

Specifications

Temperature display, temperature controlling,
compressor start delay protection, 2 defrost modes (electric heat, hot gas),

Main Function

Temperature display, temperature controlling, 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, probation time.

Technique Index

1,Temperature display range: -50~150°C(The resolution is 0.1°C)

2,Power supply: AC 220V±10% or AC 380V±10% 50Hz (Refer to the wiring diagram)

3,Operating environment: temperature -20°C~50°C, humidity≤85%

4,Relay contact capability: 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
	Upper Temp	In the state of setting	-
	Bottom Temp	In the state of setting	-
	Refrigeration	Refrigerating	Ready to refrigerate, in the state of compressor start delay protection
	Defrost	Defrosting	Dripping or the state of compressor start delay protection

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.
A99	Over probation time	If you have set the probation time F87, the alarm occurs when the accumulative running time is over probation time, and the controller can not work.

3,The temperature of the evaporator sensor display

When displaying current temperature, press “6” key, the controller will display evaporator 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

When displaying current temperature, press the key “5” “6” at the same time, then enter the state of upper temperature setting, the LED displays the upper 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 the key “5” “6” at the same time, then enter the state of bottom temperature setting, using the same way set the bottom temperature, then exit the state of parameter setting.