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
℃
t o 0.1
℃
;
Accuracy
:±
1
℃
8. Input
:
2-OFF Pt100 sensor
s
：
×
×
×
. 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
Set
Temp.
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
temp
temperature
c
SET
现 时 温 度
设 定 温 度
set
temp
temperature
c
SET
现时温度
设定温度
set
temp
temperature
c
SET
现 时 温 度
设 定 温 度
set
temp
temperature
SET
现时温度
设定温度
set
temp
temperature
SET
现 时 温 度
设 定 温 度
set
temp
temperature
SET
现时温度
设定温度
set
temp
temperature
SET
现 时 温 度
设 定 温 度
set
temp
temperature
c
SET
现时温度
设定温度
set
temp
temperature
c
SET
现 时 温 度
设 定 温 度
set
temp
temperature
SET
现时温度
设定温度
set
temp
temperature
SET
现 时 温 度
设 定 温 度
set
temp
temperature
c
SET
现时温度
设定温度
temperature
c
SET
现 时 温 度
设 定 温 度
set
temp
temperature
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
temp
temperature
SET
现 时 温 度
设 定 温 度
set
temp
temperature
SET
现时温度
设定温度
set
temp
temperature
SET
现 时 温 度
设 定 温 度
set
temp
temperature
EW-285
L
EW-285
L
EW-285
L
EW-285
L
EW-285
L
EW-285
L
EW-285
L
EW-285
L
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.
