Wiring Diagram
Trouble Shooting
Failures Causes
Solutions
No display when
power is on
Whether the power source is off;
or the temperature controller is
defective.
Check the power supply and replace
the fuse; check if there is input for
power terminal or arrange to change
controller with the distributors.
With display but not
operating
Set temp. is within the rest
interval; External
circuit
protection; Incorrect set running
mode.
Reset the required temperature control
value; check overrun and overload,
check overheat causes, and eliminate
the troubles before reset to work.
Displayed
temperature
unstable or
malfunction
Sensor circuit interfered; poor
connection; binding with other
power cords; circuit damage.
Separate sensor with power cord or
replace the shielded wire,
check
whether connecting terminal is
tightened.
Attention
1.Please read this manual carefully and follow the instructions while using the product. Connect
input/output plugs of power & sensor to the corresponding sockets by following wiring diagram
strictly. Tighten all the screws of
connection plugs, then connect the power afterwards. Otherwise,
it may affect the usage and control, and even result in damage in parts.
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 warranty for this product, which is limited to product itself and our company is not
responsible for any other joint and several liability.
If the product includes but not limited to the following damages caused by being used and installed
in unsafe environment, being connected to the load exceeds the allowable range of the product,
being disassembled and modified by the user, etc. Our company will not provide replacement or
maintenance service within the warranty period. Meanwhile, we will not be liable for any direct or
indirect damages caused.
The warranty certificate on the product is an important evidence for our product qualit
y assurance. Any
changes without authorization, damages, scratches and lose on the certificate, our company will not
provide any replacement or maintenance service for these products.
If you have any problem regarding to our products or service, please do not hesitate to contact us. We
will provide you with quality service and maintenance. Thank you.
Guangzhou Ewelly Automatic Control Co. Ltd.
http://www.eliweli.com
Unusual difference
between real temp.
and displayed temp.
Sensor installed incorrectly;
sensor line is too long that
causes high resistance; poor
connection;
sensor damage.
Must install sensors correctly; increase
cross section of extension wire; ensure
sealing
property of connecting wires, water
and moisture proofing; replace sensor.
Cannot shut down
after reaching set
temperature
Sensor installed incorrectly,
unable to measure value
correctly; Contactor of
compressor defective.
Check whether sensor measures
temperature correctly; replace
contactor of compressor.
Relay works too
frequently
Temp. return difference was set
too small or incorrect settings for
the pressure protector.
Increase the temp. return difference
values; adjust the pressure protector
settings.
With “ ” displayed
Sensor line open or short circuit.
Check connection between the sensor
wiring and coupling end.
E1
Function
Switch refrigeration and heating modes in parameter setting menu. “ ” is heating, “C” is refrigeration.
1. Refrigeration
Current temp.≥ set temp. + temp. return difference ( ) and the “Set time delay ( )” has been
delayed, the load relay is closed.
Current temp. ≤set temp.，the relay is disconnected and refrigeration stops.
2. Heating
Current temp. ≤ set temp. – temp. return difference ( ) and the “Set time delay ( )” has been
delayed, the load relay is closed and heating function starts.
Current temp. ≥ set temp.，the relay is disconnected and heating stops.
Alarm mode
1. When the sensor line is open or short circuit, the digital tube displays “E1”, the buzzer beeps and
the outputs will be disconnected, press any key to mute the alarm.
2. When the real temp.≥ “HS”
+d,the digital tube displays “HHH”
, the buzzer beeps
and all the outputs
will be disconnected, press any key to mute the alarm.
3. When the real temp.≥ “LS”
-d,the digital tube displays “LLL
”, the buzzer beeps and all the outputs
will be disconnected, press any key to mute the alarm.
·
·
·
·
Pt
Pt
d
d
H
Model: EW-988TK
Load
Output
Alarm
Output
NTC
Sensor
