LAW-CHAIN LF-318 User manual

LF-318
Freezer controller
1030062 REV:2 C,S:758CH 070307

Panel
SET
LF- 3 1 8LAW- C H AI N
O N
O F F
Defog
Defrost Light
Def Duration
Runing Cyc
Temp Diff
Temp setting
Specifications
Supply voltage12V/AC/50~60Hz
 Operating Temperature  -15°C ~ +70°C
 Temperature range-50°C ~ +80.0°C
 Display  Seven segment LED 
Resolution  0.1  Accuracy  1
 Dimension137*28*32mm
3
(Panel) 
Dimension171*141*39mm
3
(Box)  MountingEmbedded
 Maximum output rating (Resistive load)Compressor 30 A/250VDefroster 16A/250VDefogger 8A/250V
Light 8A/250VFan 8A/250V
General parameters
No. Parameter Description Range Default
1. Temperature Setting The temperature to stop compressor
-50°C ~ +80.0°C -20°C
2. Temperature Differential The temperature differential to restart compressor
+0.1°C ~ +15.0°C +4.0°C
3.
Running Cycle Defrosting when system running hours is over this
setting
0 ~ 24 hours 4 hours
4.
Defrost duration Setting the duration of defrosting
0 ~ 60 min. 20 min.
5. Defroster stopping temperature The temperature to stop defroster    °     °
+25.0°C
6.
Fan running temperature Fan running when temperature is higher than this
setting   °     °
0.0°C
7.
Compressor start-up delay Compressor start-up delay time
0 ~ 15 min. 2 min.
8. Sensor calibration Sensor calibration adjustment
-10°C ~ +10.0°C 0.0°C
Protective parameters
No. Symbol Description Range Default
1.
LO Parameter protection yn y
2. tH The upper temperature limit tS ~ +80.0°C +50.0°C
3. tL The lower temperature limit -50°C ~ tS -50°C
4. AH High temperature alarm tS ~ +80.0°C +50.0°C
5. Ht Alarm when the temperature is higher than AH setting
continuously over this duration 0~180 min. 90 min.
6. AL Low temperature alarm -50°C ~ tS -30°C
7. Lt Alarm when the temperature is lower than AL setting
continuously over this duration 0~180 min. 60 min
8. FL Fan stops when compressor stops y / n y
9. CL Condenser fin cleaning interval 0~250 days 0
10. rt Display refresh latency for fraction part of temperature 0~15 seconds 0
Setting general parameters


 Press and holdSETkey for 5 seconds until “Temperature
Setting” LED is on. Three options can be chosen at the moment
which areCC(to unlock the control panel)OO
(to lock the
control panel) and55
(to restore all parameters to the default
value). Useor
keys to select one of the options and
pressSETkey. WhenCC
is selected, no parameters can be
modified further except parameter “Temperature Setting”. If
you want to modify other parameters, please selectOO.
 To modify general parameters, PressSET
key. The display will
show symbol “888” for about 2 seconds and then “Temperature
Setting” LED will be on. The first parameter “Temperature
Setting” is ready to be modified. To change the parameter value,
useorkeys. To select next parameter, useSET
key (each parameter and it’s related LED is listed on the right. ).
Parameters and LEDs
Parameters
Temp
setting
LED
(Yellow)
Temp Diff
LED
(Yellow)
Running
Cyc
LED
(Green)
Def
Duration
LED
(Red)
Temperature Setting On
Temperature Differential On
Running Cycle On
Defrost Duration On
Defroster stopping
temperature Flash
Fan running temperature Flash
Compressor start-up delay Flash
Sensor calibration Flash
 When the last parameter (Defrost Duration) is selected, pressSETk
ey again can leave parameter setting procedure and save all settings. If
no any key is pressed within 30 seconds during parameter setting procedure, system will leave the parameter setting procedure and save all
settings automatically.

LF-318
Freezer controller
1030062 REV:2 C,S:758CH 070307

Automatic panel lockup


 If the control panel is unlocked (i.e.OOis selected) and controller is not in the parameter setting mode, the control panel will be locked
automatically after 30 seconds.
Setting protective parameters


 PressSETkey, display will flash symbol8883 times. While the display is flashing, pressandkeys simultaneously until parameter
LOis showed. PressSETkey again, display will show the parameter setting. Useorkeys to change the setting and then press
SETkey to select the next parameter. All p rotective parameters are shown in p rotective system parameters table, and can only be
modified when parameter LO is set to “n”.
 When the last parameter (rt) is selected, pressSETkey again can leave parameter setting procedure and save all settings.
 If no any key is pressed within 30 seconds during parameter setting procedure, system will leave the parameter setting procedure and save all
settings automatically.
Other operations


 After controller power on and the system is in the duration of compressor start-up delay, presskey can startup compressor immediately
(display will show “Fon”).
 When high or low temperature alarm occurs, press “Manual defrost” key can cease the buzzer.
 Compressor total running timepress both “” and “” keys simultaneously. The display will show characters “tot” and numbers and flash
3 times in turn to indicate the total running time. For example, if display is showing “tot, 001, 234”, the total running time is 1234 hours.
 To check the temperature of evaporator sensor, presskey. Display will show symbol “L2” firstly and then the temperature value.
 Condenser fin cleaningWhenCLnis shown on display, pressOn/Offkey can reset the error code and the system will recount the
cleaning interval.
Function keys
ON/
OFF
Power on/off To increase or decrease value
SET
Parameter setting key

 
Manual defrost

To turn on/off defogger (defogger
will be turned off when power is off)
 
To turn on/off the indoor
light appliance
LED indicators
(   
Power on indicator
(      
! "  # $% & # ' (  & ' ) ' # * %  + + , # # ' # * 
! "  # $% & # ' ( + , # # ' # *
(      
LED on, defogger is on
(      
! "  # $ indoor light appliance is
on
- . / 0
(1 +   # 
LED flash, compressor is in start-up
delay
LED on, compressor is running
2 3 4 5
(    LED on, system is defrosting
Error codes
Symbol Description
E1H Indoor sensor shorted or temperature higher than +80°C
E1L Indoor sensor opened or temperature lower than -50°C
E2H Evaporator sensor shorted or temperature higher than +80°C
E2L Evaporator sensor opened or temperature lower than -50°C
AH High temperature alarm
AL Low temperature alarm
Sensor specifications






6 7 (  # (  +  ' ) 8  ! " ( '  ' 9  # : ;   < : = 9 > 6φcopper head Isolated wir
NTC sensor with BLACK PVC/1.5M/4.5cm 6φ
copper head 
Note  Lengthen your
NTC sensor probe, Please pay
attention on below: 
(1) Turn off the system power.
(2). To avoiding short circuit, the connection points should be
interleaved, as shown on the right.


    
   

Wiring diagram 


123
Sensor
Power
Indoor
Evaporator
123456789101112






  
    
  
 
  
   
  
   







 


    
        
    
   
      
          
            
      


    
      
     
  
 
      
            
      
       
              
          
    
     
    
  