1
NA8820 User Guide
3
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:
2
Temperature display range:
-50
～
150
℃
(The resolution is 0.1
℃
)
-58
～
302
℉
(The resolution is 0.1
℉
)
2
Power supply:
AC 220V±10% or AC 380V±10% 50Hz (Refer to the wiring diagram)
2
Operating environment:
temperature -10
℃～
50
℃
, humidity
≤
85%.
2
Relay contact capability:
compressor 20A/250VAC, defrost 8A/250VAC (pure resistive load)
2
Temperature sensor:
NTC R25=5k
Ω
,
B
(25/50)
=3470K
2
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
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
*
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
Explanation
A11
External alarm
Alarm from external alarm signal, please 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
“
”
）
. If you don’t
need to use the evaporator sensor, you can use the F59 to close the alarm.
*
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
