EWELLY EW-285L User manual

Version：285L.19.03.25
Welcome to choose our instruments. This micro-
computer temperature controller is specialized
designed for refrigerator and freezer, easy-to-use,
accurate control, and strong anti-interference. Our
sensor is precisely made and sealed. It is moisture
proof, therefore its performances are more stable and
reliable.
1 : AC220V ±10％ 50HZ/60HZ
2 : 5A/220V/AC
3：≤3W
4 : －10℃～50℃ R H≤90%
5：—100℃～100℃
6 : ＞-20℃ to 0.1℃; Accuracy: ±0.5℃
≤-20℃ to 0. 1℃; Accuracy:±1℃
8. Input: 2-OFF Pt100 sensors
： × ×
×
. Operating voltage
. Output Load
. Power Consumption
. Working environment
. Control Range
. Resolving
9. Overall Dimension 160mm(length) 45mm(width)
81mm(high)
10. Mounting Size: 138mm(length) 32mm(width)
Press key once, then use or
to select temperature return difference
1℃～10℃。
EW-28 5 L
Se t T em p.
Temperature
SET
！
PV
SV
Microcomputer Thermostat Serial
EW-285L Dual Compressor Operation Manual
Technical Specifications：
Panel Appearance
Demand of installation
1. It is necessary to ensure the power supply voltage meets
the requirements of the controller, the deviation betwe-
en power supply and rated voltage is no greater than
±5%.
2. The sensor line must be kept away from the power line.
3. Strictly distinguish the interface of power line, power
line, and relay output.
Press key twice, then use or
to select NO.1 compressor start delay
time 0~10min.
Press key 3 times, then use or
to select cold room Temp. calibration
-15℃~15℃.
Press key 4 times, then use or
to change air-returning pipe Temp. cali-
bration -15℃~15℃.
Press key 5 times, then use or
to select NO.2 compressor start delay
time 0~30min (after NO.1 compressor
starts).
Press key 6 times, then use or
to select NO.2 compressor start Temp.
-135℃~50℃.
Press key 6 times, then use or
to select NO.2 compressor start Temp.
-135℃~50℃.
Press key 7 times, then use or
to select defrost time 1~60min.
Press key 8 times, then use or
to select defrost cycle 0~99hr.
Press key 9 times, then use or
to select dripping time 0~30min.
1. Temp. control setting: Press to display the set temp., to press
or to change set temp.
2. Parameters setting: Hold key for 6s to enter the manual, it
displays , then press
3. Press for 10s, the display will flash, and all parameters are
restored to factory default values. (After flashing, please reconnect
the power to let the system return to the normal operation mode)
4. Switch on/off
Press for 3s under operation mode, and the display is off, and all
outputs will be cut out. Under the shutdown mode, press key for
3s, indicator turns on, and thermostat returns to normal operation.
5. Display the air-returning sensor Temperature
Press under un-setting mode, the displayed temp. shows the air-
retruning temp. , and set temp. will not be displayed.
6. Display defrost time
Press under un-setting mode for 5s, it displays the defrost mode
or defrost termination remaining time.
continuously, the following parameter
codes will be displayed in sequence:
Operation Instructions
c
SET
现时温度 设 定 温度
set te m p
temp e ratu r e
c
SET
现时温度 设 定 温度
set temp
temperature
c
SET
现时温度 设 定 温度
set te m p
temp e ratu r e
c
SET
现时温度 设 定 温度
set temp
temperature
SET
现时温度 设 定 温度
set te m p
temperature
SET
现时温度 设 定 温度
set temp
temperature
SET
现时温度 设 定 温度
set tem p
temp e ratu r e
SET
现时温度 设 定 温度
set temp
temperature
c
SET
现时温度 设 定 温度
set te m p
temp e ratu r e
c
SET
现时温度 设 定 温度
set temp
temperature
SET
现时温度 设 定 温度
set temp
temp e ratu r e
SET
现时温度 设 定 温度
set temp
tempe r ature
c
SET
现时温度 设 定 温度
temp e ratu r e
c
SET
现时温度 设 定 温度
set tem p
tempe r ature
c
SET
现时温度 设 定 温度
temperature
c
SET
现时温度 设 定 温度
set temp
temperature
SET
现时温度 设 定 温度
set tem p
temperature
SET
现时温度
设定温度
set temp
tempe r ature
SET
现时温度 设 定 温度
set tem p
temp e ratu r e
SET
现时温度 设 定 温度
set temp
temperature
EW- 285L
EW- 285L
EW- 285L
EW- 285L
EW- 285L
EW- 285L
EW- 285L
EW- 285L
Failure mode management:
If the cold room sensor is open or short circuit, it displays “E1", then the
system enter failure operation mode, which No.1 compressor runs 45mins then
stop for 15mins until the system goes back to normal. No.2 compressor stops
working during this period.
Air-returning sensor is open or short circuit, it displays “E2” and it doesn’t
affect system operation.

Code Function Setting Range Default setting Unit
No .1 c o mp r es so r
ti me d e la y
Tem p e ratu r e
cal i b rati o n
Temp. ret u r n
differe n c e
-15～15
1～10
1～10
0
2
4
℃
℃
mi n
电气接线图
-15～15
0℃
0～30 3min
Defro s t t i m e
Def r ost c y c le
Dri p pi n g ti m e
aft e r de f ro s t
0～99
1～60
0～30
hr
mi n
6
10
2
-135～50 -5.0℃
min
Feature Descriptions：
Cooling: When the current temperature ≥ set temperature + temp.
return difference and reach set “time dealy”,the relay is closed.
Stop Cooling: When the current temperature ≤ the set tempe-
rature, the cooling relay is off.
Enter defrost mode:
1. When the system finish running a set “running cycle”after defrost or
just after boot, it enters defrost mode (the load relay is off, defrost relay
is closed, defrost indicator is on), and set temp. displays the defrost temp.
(need to press after defrost termination to check).
2. Press key for 6s, enter defrost mode. (the relay is off, defrost relay
is close, defrost indicator is on)
Exit defrost mode:
1.Under the defrost mode, when the system runs over the set
defrost time, defrost relay and defrost indicator will be off,
system exits defrost mode and return to the normal control.
2. Press for 6s, defrost relay and defrost indicator will be
off, systems exits defrost mode and return to the normal co-
ntrol.
Def r o st tem p .
cal i b rati o n
No .2 c o mp r es so r
st ar t t em p .
No .2 c o mp r es so r
ti me d e la y
Trouble shooting
Warnings
1. Please read this product instruction carefully and connect input/output plugs of
power & sensor to the corresponding sockets strictly by following connection
diagram strictly. Check again to make sure there is no mistake, tighten all the
screw of connection plugs again, and then connect the power afterwards. Otherwi-
se wrong connection will affect the usage and control, and even result in parts
burning.
2. Keep this product from away moisture, corrosive air and high magnetic field.
Otherwise the normal operation of this product will be affected.
3. All our products have passed strict quality inspections before leaving factory.
We provide one-year quality guarantee (which is limited to product itself ,and is
not responsible for any other joint and several liability) period for this product.
If you have any doubt or problem regarding to our
products, please contact our distributors and we will
provide you high-quality after-sale services.
Thanks you.
Guangzhou Ewelly Automatic Control Co., Ltd.
http://www.eliweli.com
Wiring diagram
Parameters for Procedure
No.2 compressor starts: when No.1 compressor operates over
the value “ ” or the air-returning temp. ≤ the value of “ ”
No.2 compressor stops: NO.1 & 2 compressors stop running sim-
ultaneously.
When defrost cycle is set to “0”, it will not enter defrost cycle, but
still can manually force to defrost.
No display when power is on.
Display but machine does not work
The sensor wiring is interfered or poorly
contacted or is tied with other cables.
The circuit is damaged.
Separate sensor wiring with power cables or
change shielded lines or check if the contact
is tight or not.
Real temperature is much different
to thermostat display.
The locations for the sensors are not correct or
sensor wiring is too long and its resistance is too
big. The wiring contact is poor and the sensor is
damaged.
All sensors should be installed into the correct
location. Enlarge the cross section of the expanded
wires. Make sure the wiring is sealed properly, water-
proof or moisture-proof of performance is qualified.
Change sensor if necessary.
Machine does not stop as soon as
the temperature reaches set value
The sensor is not correctly installed and cannot
measure the correct temperature. The contactor
of compressor failed.
Check if the sensor has accurately measured
the temperature or not. Change compressor relay.
Return difference value is too small or
the setting for pressure protection is incorrect.
Reset and enlarge the temperature value of return
difference. Adjust setting for pressure protection.
“E1”is displayed The sensor circuit is opened or shorted. Check connection between the sensor wiring
and coupling end.
Failures Causes Solutions
Check to see if the power is short circuit
or the thermostat is faulty.
Check power supply and change fuse.
Check if there is 220V power input or change
thermostat with our distributor.
The setting temperature is higher than the
current temperature.
The heat protector is open circuit because the
pressure is over loads.
The heat protector within compressor is open
circuit.
Reset the necessary controlling temperature.
Check the reasons for overload and overheating.
After the trouble is solved, resume the work.
Displayed temperature is unstable or
there exists misplay
Compressor works with
over-frequency
Model：EW-285L
45 6 7 8 9
123
Return air
pipe Temp.
Room Temp.
2-OFF PT100
Sen s or s
220V/AC
220V/AC
5A
10
1
1
5A
5A
Defrost
No.1
Compr essor
1
214
No.2
Compr essor
31