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Main Function and Technique Index
Main Function:
Refrigeration Controlling (Refrigeration / heat): temperature display, temperature controlling
(refrigeration/heat mode can be set)，compressor start delay protection, temperature sensor error alarm.
Defrost Controlling: 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, defrost sensor error alarm.
External alarm: one external alarm input, it can be set to 5 modes: always open, always open locked,
always closed, always closed locked or forbidden.
Main Technique Index:
Temperature display range: -50～150℃(The resolution is 0.1℃)
Power supply: AC 220V±10% or AC 380V±10% 50Hz (Refer to the wiring diagram)
Operating environment: temperature -10℃～50℃, humidity≤85%.
Relay contact capability: compressor 20A/250VAC, defrost 8A/250VAC (pure resistive load)
Temperature sensor: NTC R25=5kΩ, B (25/50) =3470K
Executive standard: Q/320585 XYK 01 (NA8820-CTDA)
Operating Guide
Panel:
What's the meaning of the index lights on the panel?
The function of the LED on the panel is showing below:
Index Light
Name
Temp Setting
Refrigeration
Heat
Defrost
-
Alarm
The 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
Signification
A11
External alarm
A21
Temperature sensor error
A22
Evaporator sensor error
How to set the temperature?
Press the key "set" for at least 2 seconds, then enter the state of temperature setting, here the LED
displays the setting temperature, then using " " key or " " key can change the parameter（the
NA8820 User Guide
-58～302℉(The resolution is 0.1℉)
Light
In the state of temp setting
Refrigerating
Heating
Defrosting
-
-
Alarm from external alarm signal, please refer to the internal parameter code "F50"
Open or short（showing "OPE" or "SHr"）
Open or short（showing "OPE" or "SHr" when press the key
need to use the evaporator sensor, you can use the F59 to close the alarm.
Flash
Ready to refrigerate, in the state of compressor start delay
protection
Ready to heat, in the state of compressor start delay
protection
Dripping or the state of compressor start delay protection
Alarm state
Explanation
-
-
" "
）. If you don't
1
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Table of Contents
Summary of Contents for Newasia NA8820
- Page 1 Operating environment: temperature -10℃～50℃, humidity≤85%. Relay contact capability: compressor 20A/250VAC, defrost 8A/250VAC (pure resistive load) Temperature sensor: NTC R25=5kΩ, B (25/50) =3470K Executive standard: Q/320585 XYK 01 (NA8820-CTDA) Operating Guide Panel: What’s the meaning of the index lights on the panel?
-
Page 2: Advanced Operation
key“ ”adds 0.1°C, the key“ ”minuses 0.1°C, press and hold it over 0.5 seconds can add or minus rapidly）. After setting, press “set” again, then exit the state of parameter setting. (The setting temp range is limited by the parameters F13 and F14, please refer to the advanced operation). Pressing the key “M” in the setting process means cancel and exit, but the setting value will not be saved. - Page 3 0:only controlled by time Defrost stop mode 0 or 1 1:controlled by both time and temp Defrost heat mode 0 or 1 0: electric heat 1: hot gas 0: without external alarm 1: always open, unlocked External alarm mode 0 -- 4 2: always open, locked Alarm 3: always closed, unlocked...
- Page 4 defrosting, in 5 minutes, compressor doesn’t run, in this state, “Defrost” indicator light will flash. But in two conditions the controller can’t enter the dripping state: one is finishing the defrosting manually, and the other is defrosting temperature sensor’s error. External alarm The controller can connect a switching value as external alarm source (Pin 4, 5), when the external alarm occurs, the controller stops, displays the alarm code “A11”...
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