SF-104S-2 Cool room fridge digital controller with defrost function

Features of Function
Super-thin,water-proof, with outer high-voltage parts,easy&convenient to fix the compressor of one HP.
Temperature Display/ Temperature Control/Evap.Fan Control/Value Storing/ Self Testing
Specifications
1. Output of the outside sealed transformer:AC12V(one transformer matched with one temp. controller)
2. Temperature sensor: NTC, 2m(L)
3. Range of temperature displayed :－45～150℃ Accuracy:± 1℃
4. Range of set temperature: －45～99℃ Factory default :4℃
5. Dimension:77(Length)×35(Width)×30(Depth)mm
Mounting hole dimension:71(Length)×29(Width)mm
6. Temperature of the operating environment:－10～60℃
Relative Humidity:20%~90%(Non-condensing)
7. Relay output contact capacity:
Compressor : N.O. 30A/250VAC
Evap.Fan : N.O.30A/250VAC
Front Panel Operation
1. Set temperature(compressor stop temperature) adjustment:
Press “SET” button, the set temperature is displayed.
Press “▲”or“▼” button to modify and store the displayed value. Press “SET” button to exit the adjustment
and display the cold room temperature.
If no more button is pressed within 6 seconds, the cold room temperature will be displayed.
(Set temperature adjustment range: parameter E1～E2)
2. Refrigeration LED: During refrigeration, the LED is on; When the cold room temp. is constant, the LED is off;
During the delay start, the LED flashes.
3. Defrost LED: during defrosting , the LED is on; When the cold-room temp. is constant, the LED if off; During
the delay start, the LED flashes.
4. Manually start / stop defrost: pressing “SET” & “Defrost” buttons simultaneously for 6 seconds can start or
stop defrost.
5. Parameter setup
Press “SET” button and hold for 6 seconds to enter the parameter setup mode while E1 flashes.
Press again “SET” button to select sequentially from the parameters : E2,E3,E4,E5,E1.
Press “▲”or“▼” button, the value of parameter will be displayed and can be modified and stored.
If no more button is pressed within 6 seconds, it will return to normal operation mode.
Parameter Function Set range Default
E1 Lower setpoint limit －45℃～Set temp. 2℃
E2 Higher setpoint limit Set temp.～99℃ 8℃
E3 Temp.hysteresis 1～20℃ 4℃
E4 Comp.start delay time 0～10Min 0Min
E5 Offset on room Temp. －10～10℃ －1℃
6. The factory default resumption: press“▼” button and “▲”button simultaneously for 6 seconds, the display
flashes , all parameters will be resumed as same as factory defaults. After 6 seconds, it returns to the normal
operation.
7. Lock parameters:
In normal operating, press “▼” button and hold for 6 seconds to lock the parameters if "OFF" is displayed, or
to unlock if "ON" is displayed. Parameter can be displayed only and can not be modified if locked. (the factory
default is "ON" )
Function details
1. Temperature Control
After turning on for the delay time ,the compressor starts operating and evap.fan starts operation after 3
seconds delay time when cold-room temperature≥ (set temperature+ hysteresis), and will be off when cold-room
temperature ≤ set temperature.
To protect the compressor,it can re-start unless the time when the compressor stops every time is longer than the
delay time(Parameter E4).
2. Timing defrosting by turning off the compressor
After operating for a defrost interval time (parameter F2), it enters turning-off state automatically, the
compressor stops and evaporation fan operates;it enters automatic temperature control state after certain time
(Parameter F1).
When parameter F4=1,the cold-room temperature is locked durimg defrosting, the temperature in defrosting
state is displayed. After defrosting, the cold-room display will be resumed normal after displaying delay parameter
F6 (or reach control temperature).
When the defrost interval time is set to "00" , the function of automatic defrost will be cancelled.
press “SET” and “▼” button simultaneously and hold for 6 seconds to enter the parameter setup mode while F1
flashes. Press again “SET” button to select F2,F4,F6,F1. Press “▲”or “▼” button, the value of parameter will
be displayed and can be modified and stored.
If no more button is pressed within 6 seconds, it will return to normal operation mode.
Parameter Function Set range Default
F1 Max.Defrost duration 1～90Min 18Min
F2 Defrost interval time 0～24Hr 6Hr
F4 Display during defrost 0=Normal display
1=Last value before defrost
1
F6 The temp.display delay
time after defrost
1～30Min 10Min
3. Abnormal work mode
When room sensor is short-circuited or overheated (more than 150℃) "HH" is displayed ; When room sensor is
open-circuited or temperature is too low ( less than －45℃) "LL" is displayed. At that time the compressor enters
timing operation mode automatically by the cycle of 45 minutes on and 15 minutes off.
4.Circuit Diagram

Notes for Installation
1. Sensor leads must be kept separately from main voltage wires in order to avoid high frequency noise induced.
Separate the power supply of the loads from the power supply of the controller.
2. During electrifying, relay control wires should be connected correctly.When installation the sensor shall be
placed with the head upward and the wire downward;
3. The temperature controller can not be installed in the area with water drops.
Accessories for the temperature controller
1. One attached transformer and two relays
2. One temperature sensor